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Insights into effects of ZrO_(2) crystal phase on syngas‐to‐olefin conversion over ZnO/ZrO_(2) and SAPO‐34 composite catalysts 被引量:3
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作者 Zhaopeng Liu Youming Ni +6 位作者 Zhongpan Hu Yi Fu Xudong Fang Qike Jiang Zhiyang Chen Wenliang Zhu Zhongmin Liu 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2022年第3期877-884,共8页
The utilization of metal oxide‐zeolite catalysts in the syngas‐to‐olefin reaction is a promising strategy for producing C_(2)–C_(4) olefins from non‐petroleum resources.However,the effect of the crystal phase of ... The utilization of metal oxide‐zeolite catalysts in the syngas‐to‐olefin reaction is a promising strategy for producing C_(2)–C_(4) olefins from non‐petroleum resources.However,the effect of the crystal phase of metal oxides on the catalytic activity of these oxides is still ambiguous.Herein,typical metal oxides(ZnO/ZrO_(2))with different crystal phases(monoclinic(m‐ZrO_(2))and tetragonal(t‐ZrO_(2)))were employed for syngas conversion.The(ZnO/m‐ZrO_(2)+SAPO‐34)composite catalyst exhibited 80.5%selectivity for C_(2)–C_(4) olefins at a CO conversion of 27.9%,where the results are superior to those(CO conversion of 16.4%and C_(2)–C_(4) olefin selectivity of 76.1%)obtained over(ZnO/t‐ZrO_(2)+SAPO‐34).The distinct differences are ascribed to the larger number of hydroxyl groups,Lewis acid sites,and oxygen defects in ZnO/m‐ZrO_(2) compared to ZnO/t‐ZrO_(2).These features result in the formation of more formate and methoxy intermediate species on the ZnO/m‐ZrO_(2) oxides during syngas conversion,followed by the formation of more light olefins over SAPO‐34.The present findings provide useful information for the design of highly efficient ZrO_(2)‐based catalysts for syngas conversion. 展开更多
关键词 Syngas‐to‐olefins Crystal phase ZnO/ZrO_(2) SAPO‐34 composite catalyst
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PREPARATION,CHARACTERIZATION AND HYDROGENATION PROPERTY OF POLYMER-SUPPORTED Pd-Fe_2O_3 COMPOSITE CATALYSTS
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作者 ZHANG Shengmin HU Weibing ZHANG Manzheng Wuhan University of Technology Hubei Research Institute of Chemistry 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 1999年第4期48-52,共5页
A series of polymer- supported Pd -Fe2O3 composite catalysts were prepared and their hydrogenation property mas investigated. It was found that the above catalysts have good catalytic hydrogenation activity for carbon... A series of polymer- supported Pd -Fe2O3 composite catalysts were prepared and their hydrogenation property mas investigated. It was found that the above catalysts have good catalytic hydrogenation activity for carbon - carbon double bonds systems and reusability. Furthermore, XPS and IR spectra shouted that active component in the composite catalysts is atomic Pd(0). An addition of a small amount of Fe2O3 has a promotive action upon hydrogenation activity of the catalysts, which indicated that there are some strong interactions (electron transfer) between Pd(0) and Fe(Ⅲ) species. Based on these results, a possible catalytic hydrogenation mechanism was also suggested. 展开更多
关键词 functional material polymet-sup- ported catalyst composite Pd - F2O3/polystyrene HYDROGENATION mechanism
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Photocatalytic activity and kinetics for acid yellow degradation over surface composites of TiO_2-coated activated carbon under different photocatalytic conditions 被引量:3
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作者 曾孟雄 李佑稷 +2 位作者 马明远 陈伟 李雷勇 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第4期1019-1027,共9页
TiO2-coated activated carbon surface (TAs) composites were prepared by a sol-gel method with supercritical pretreatment. The photocatalytic degradation of acid yellow (AY) was investigated under UV radiation to es... TiO2-coated activated carbon surface (TAs) composites were prepared by a sol-gel method with supercritical pretreatment. The photocatalytic degradation of acid yellow (AY) was investigated under UV radiation to estimate activity of catalysts and determine the kinetics. And the effects of parameters including the initial concentration of AY, light intensity and TiO2 content in catalysts were examined. The results indicate that TAs has a higher efficiency in decomposition of AY than P25, pure TiO2 particles as well as the mixture of TiO2 powder and active carbon. The photocatalytic degradation rate is found to follow the pseudo-first order kinetics with respect to the AY concentration. The new kinetic model fairly resembles the classic Langmuir-Hinshelwood equation, and the rate constant is proportional to the square root of the light intensity in a wide range. However, its absorption performance depends on the surface areas of catalysts. The model fits quite well with the experimental data and elucidates phenomena about the effects of the TiO2 content in TAs on the degradation rate. 展开更多
关键词 PHOTOCATALYSIS TiO2-coated activated carbon acid yellow composite catalyst
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Peroxymonosulfate Activation by CoFe_(2)O_(4)/MgAl-LDH Catalyst for the Boosted Degradation of Antibiotic
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作者 LI Jianjun CHEN Fangming +5 位作者 ZHANG Lili WANG Lei ZHANG Liting CHEN Huiwen XUE Changguo XU Liangji 《无机材料学报》 北大核心 2025年第4期440-448,I0022-I0024,共12页
Owing to outstanding hydrophilicity and ionic interaction,layered double hydroxides(LDHs)have emerged as a promising carrier for high performance catalysts.However,the synthesis of new specialized catalytic LDHs for d... Owing to outstanding hydrophilicity and ionic interaction,layered double hydroxides(LDHs)have emerged as a promising carrier for high performance catalysts.However,the synthesis of new specialized catalytic LDHs for degradation of antibiotics still faces some challenges.In this study,a CoFe_(2)O_(4)/MgAl-LDH composite catalyst was synthesized using a hydrothermal coprecipitation method.Comprehensive characterization reveals that the surface of MgAl-LDH is covered with nanometer CoFe_(2)O_(4) particles.The specific surface area of CoFe_(2)O_(4)/MgAl-LDH is 82.84 m^(2)·g^(-)1,which is 2.34 times that of CoFe_(2)O_(4).CoFe_(2)O_(4)/MgAl-LDH has a saturation magnetic strength of 22.24 A·m^(2)·kg^(-1) facilitating efficient solid-liquid separation.The composite catalyst was employed to activate peroxymonosulfate(PMS)for the efficient degradation of tetracycline hydrochloride(TCH).It is found that the catalytic performance of CoFe_(2)O_(4)/MgAl-LDH significantly exceeds that of CoFe_(2)O_(4).The maximum TCH removal reaches 98.2%under the optimal conditions([TCH]=25 mg/L,[PMS]=1.5 mmol/L,CoFe_(2)O_(4)/MgAl-LDH=0.20 g/L,pH 7,and T=25℃).Coexisting ions in the solution,such as SO_(4)^(2-),Cl-,H_(2)PO_(4)^(-),and CO_(3)^(2-),have a negligible effect on catalytic performance.Cyclic tests demonstrate that the catalytic performance of CoFe_(2)O_(4)/MgAl-LDH remains 67.2%after five cycles.Mechanism investigations suggest that O_(2)^(•-)and ^(1)O_(2) produced by CoFe_(2)O_(4)/MgAl-LDH play a critical role in the catalytic degradation. 展开更多
关键词 magnetic composite catalyst PEROXYMONOSULFATE CoFe_(2)O_(4)/MgAl-LDH advanced oxidation process antibiotic
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High-efficiency electrochemical H_(2)O_(2)synthesis by heteroatom-doped NiX/Ni nanocomposites with honeycomb-like porous carbon 被引量:1
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作者 Mengran Liu Canyu Liu +7 位作者 Tianfang Yang Shixiang Hu Siyun Li Shizhe Liu Yang Liu Ye Chen Bingcheng Ge Shuyan Gao 《Chinese Journal of Catalysis》 CSCD 2024年第11期212-222,共11页
Transition metal Ni anchored in carbon material represents outstanding 2e^(-) oxygen reduction reaction(ORR)catalytic selectivity,but enhancing the adsorption strength of intermediate*OOH to promote its selectivity re... Transition metal Ni anchored in carbon material represents outstanding 2e^(-) oxygen reduction reaction(ORR)catalytic selectivity,but enhancing the adsorption strength of intermediate*OOH to promote its selectivity remains a major challenge.Herein,the NiX/Ni@NCHS composite catalyst with heteroatom doping(O,S)is modulated by controlling partial pyrolysis strategies on honeycomb-like porous carbon to manipulate the electronic structure of the metal Ni.With the synergistic effect of honeycomb structure and O atom,NiO/Ni@NCHS-700 exhibits an exceptional H_(2)O_(2)selectivity of above 89.1%across a wide potential range from 0.1 to 0.6 V in an alkaline electrolyte,and an unexpected H_(2)O_(2)production rate up to 1.47 mol gcat^(-1) h^(-1)@0.2 V,which outperforms most of the state-of-the-art catalyst.Meanwhile,NiS/Ni@NCHS exhibits excellent electrocatalytic performance,with 2e^(-) ORR selectivity of 91.3%,H_(2)O_(2)yield of 1.85@0.3 V.Density functional theory simulations and experiments results reveal that the heteroatom doping(O,S)method has been employed to regulate the adsorption strength of Ni atoms with*OOH,and combined with the self-sacrificing template-assisted pyrolysis approach to improve the microstructure of catalysts and optimize the active site.The heteroatom doping method in this work provides significant guidance for promoting 2e^(-) ORR electrocatalysis to produce H_(2)O_(2). 展开更多
关键词 NiX/Ni@NCHS composite catalyst 2e^(-)oxygen reduction reaction Honeycomb-like porous carbon Density functional theory ELECTROCATALYSIS
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Hydrogenation properties of mechanically milled Mg_2Ni_(0.8)Cr_(0.2)-CoO/Al_2O_3 composites
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作者 王秀丽 涂江平 +2 位作者 陈长聘 张孝彬 赵新兵 《Journal of Zhejiang University-Science B(Biomedicine & Biotechnology)》 SCIE EI CAS CSCD 2005年第3期208-212,共5页
Mg2Ni0.8Cr0.2-x wt.% CoO/Al2O3 (x=0.5, 1, 2 and 3) composites were prepared by mechanically milling sintered Mg2Ni0.8Cr0.2 alloy and CoO/Al2O3 compound for 45 h. The addition of CoO/Al2O3 compound resulted in the good... Mg2Ni0.8Cr0.2-x wt.% CoO/Al2O3 (x=0.5, 1, 2 and 3) composites were prepared by mechanically milling sintered Mg2Ni0.8Cr0.2 alloy and CoO/Al2O3 compound for 45 h. The addition of CoO/Al2O3 compound resulted in the good kinetics properties of hydriding/dehydriding reaction of the composites. The composite with 1.0 wt.% CoO/Al2O3 catalyst could reach the maximum hydrogen absorption capacity (2.9 wt.%) within 5 min at 393 K under H2 pressure of 4 MPa, and can desorb rapidly at 493 K. The decomposition and synthesis of hydrogen molecule on Mg2Ni0.8Cr0.2 alloy surface was promoted by addition of CoO/Al2O3 catalyst. In addition, the formation of metallic Ni particles, strain and defects during the ball milling process also resulted in the improved hydrogenation performance of Mg2Ni-based alloys. 展开更多
关键词 Mg2Ni-based composite Hydrogen storage Ball milling catalyst Hydriding/dehydriding kinetics
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异质原子掺杂并合理调控MoS_(2)的配位环境与电子结构以降解污染物
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作者 杨柳 于翔 +2 位作者 王子晗 谢佳瑶 邱乐乐 《复合材料学报》 北大核心 2025年第11期6474-6482,共9页
近年来,由于单原子催化剂(SACs)活化过氧单硫酸盐(PMS)的高级氧化法能够实现高效稳定地处理废水中难自然降解的有机污染物的目的,因此获得了广泛关注。然而,对于SACs活化过氧单硫酸盐产生氧化活性物质的驱动机制及其结构-性能关系的理... 近年来,由于单原子催化剂(SACs)活化过氧单硫酸盐(PMS)的高级氧化法能够实现高效稳定地处理废水中难自然降解的有机污染物的目的,因此获得了广泛关注。然而,对于SACs活化过氧单硫酸盐产生氧化活性物质的驱动机制及其结构-性能关系的理解仍然具有挑战性。本文以MoS_(2)为基体,采用水热法合成Ni原子均匀分散的Ni/MoS_(2)单原子催化剂,并深入分析了其活化PMS降解的四环素(TC)的内在机制。结果表明,在60 min内,Ni_(0.2)/MoS_(2)单原子催化剂对TC的降解率可达到88.1%,是纯MoS_(2)的3.2倍。实验与密度泛函理论(DFT)计算表明,Ni原子的引入降低了PMS的吸附能垒,增强了活性物种(ROS)的生成,显著提高了催化效率。此外,Ni_(0.2)/MoS_(2)单原子催化剂具有更稳定的结构和更好的循环稳定性。本文为MoS_(2)纳米材料中掺杂杂原子提供了明确的理论基础,为进一步构建高效的PMS活化剂提供了新的策略。 展开更多
关键词 MoS_(2) 复合催化剂 高级氧化法 过氧单硫酸盐 降解 四环素
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Methanation of carbon dioxide on Ni/ZrO_2-Al_2O_3 catalysts:Effects of ZrO_2 promoter and preparation method of novel ZrO_2-Al_2O_3 carrier 被引量:33
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作者 Mengdie Cai Jie Wen +2 位作者 Wei Chu Xueqing Cheng Zejun Li 《Journal of Natural Gas Chemistry》 EI CAS CSCD 2011年第3期318-324,共7页
The novel nickel-based catalysts with a nickel content of 12 wt% were prepared with the zirconia-alumina composite as the supports. The new carriers, ZrO2 improved alumina, were synthesized by three methods, i.e., imp... The novel nickel-based catalysts with a nickel content of 12 wt% were prepared with the zirconia-alumina composite as the supports. The new carriers, ZrO2 improved alumina, were synthesized by three methods, i.e., impregnation-precipitation, co-precipitation, and impregnation method. The catalytic properties of these catalysts were investigated in the methanation of carbon dioxide, and the samples were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscope (XPS), temperature-programmed reduction (TPR) and temperature-programmed desorption (TPD) techniques. The new catalysts showed higher catalytic activity and better stability than Ni/γ-Al2O3. Furthermore, as a support for new nickel catalyst, the ZrO2-Al2O3 composite prepared by the impregnation-precipitation method was more efficient than the other supports in the methanation of carbon dioxide. The highly dispersed zirconium oxide on the surface of γ-Al2O3 inhibited the formation of nickel aluminate-like phase, which was responsible for the better dispersion of Ni species and easier reduction of NiO species, leading to the enhanced catalytic performance of corresponding catalyst. 展开更多
关键词 zirconia-alumina composite nickel catalyst CO2 METHANATION preparation method
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Effect of CeO2-ZrO2 on Pt/C electrocatalysts for alcohols oxidation 被引量:2
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作者 王青春 刘振朋 +3 位作者 安胜利 王瑞芬 王艳玲 徐拓 《Journal of Rare Earths》 SCIE EI CAS CSCD 2016年第3期276-282,共7页
The electrocatalytic activity and stability of Pt/C catalyst modified by using CeO_2-ZrO_2 mixed oxides for the alcohols electrochemical oxidation as probes were investigated. The catalyst samples were characterized b... The electrocatalytic activity and stability of Pt/C catalyst modified by using CeO_2-ZrO_2 mixed oxides for the alcohols electrochemical oxidation as probes were investigated. The catalyst samples were characterized by X-ray diffraction(XRD) and scanning electron microscopy(SEM). The electrochemical properties were measured by a three electrode system on electrochemical workstation(IVIUM). The results showed that the presence of CeO_2-ZrO_2 might be associated with the presence of Pt, which indicated that possibly there was synergistic effect between CeO_2-ZrO_2 and Pt nanoparticles. The electrocatalytic activity and stability of Pt-MO_x/C(M=Ce, Zr) for methanol and ethanol oxidation was better than that of Pt-CeO_2/C, which was attributed to that CeO_2-ZrO_2 composited oxides enhanced oxygen mobility and promoted oxygen storage capacity(OSC). Furthermore, the best performance was found when the molar ratio of CeO_2 to ZrO_2 was 2:1 for the oxidation of methanol and ethanol. The forward peak current density of Pt-MO_x/C(M=Ce, Zr, Ce:Zr=2:1) towards the methanol electrooxidation was about 3.8 times that of Pt-CeO_2/C. Pt-MO_x/C(M=Ce, Zr) appeared to be a promising and less expensive methanol oxidation anode catalyst. 展开更多
关键词 CEO2-ZRO2 composite oxide catalyst preparation characterization performance rare earths
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Synthesis and study of λ-MnO_2 supported Pt nanocatalyst for methanol electro-oxidation 被引量:3
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作者 XIE Jia, LI Xiang, YU Zhihui, ZHANG Lijuan, LI Fan, and XIA Dingguo College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China 《Rare Metals》 SCIE EI CAS CSCD 2010年第2期187-192,共6页
A λ-MnO2 supported Pt nanocatalyst(5 wt.% Pt/λ-MnO2) was synthesized using a facile approach.X-ray diffraction(XRD), X-ray photoelectron spectroscopy(XPS), scanning electronic microscope(SEM), transmission e... A λ-MnO2 supported Pt nanocatalyst(5 wt.% Pt/λ-MnO2) was synthesized using a facile approach.X-ray diffraction(XRD), X-ray photoelectron spectroscopy(XPS), scanning electronic microscope(SEM), transmission electron microscopy(TEM), and energy disperse spectroscopy(EDS) were used for catalyst structure and morphology characterization, which showed that the metallic Pt particles were attached on a λ-MnO2 surface through the interaction between Pt and λ-MnO2.Cyclic voltammetry(CV) was used to test the catalytic activity of Pt/λ-MnO2 toward methanol oxidation, which showed that Pt/λ-MnO2 catalyst has much higher catalytic activity than baseline Pt/C catalyst. 展开更多
关键词 electrochemistry composite catalyst MnO2 Pt methanol oxidation
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硫掺杂管状g-C_(3)N_(4)/ZnIn_(2)S_(4)高效光催化制氢催化剂制备及性能研究 被引量:1
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作者 林政楠 方庆艳 +2 位作者 谭鹏 陈刚 张成 《燃料化学学报(中英文)》 北大核心 2025年第7期1101-1111,共11页
石墨氮化碳(g-C_(3)N_(4))基材料光催化制氢是当前氢能领域的研究热点,但高效g-C_(3)N_(4)材料的设计和合成仍然是一个重大挑战。本工作利用超分子自组装合成策略和水热反应构建了硫掺杂管状g-C_(3)N_(4)/层状ZnIn_(2)S_(4)复合材料,研... 石墨氮化碳(g-C_(3)N_(4))基材料光催化制氢是当前氢能领域的研究热点,但高效g-C_(3)N_(4)材料的设计和合成仍然是一个重大挑战。本工作利用超分子自组装合成策略和水热反应构建了硫掺杂管状g-C_(3)N_(4)/层状ZnIn_(2)S_(4)复合材料,研究了复合材料的光催化性能并揭示机理。结果表明,S掺杂管状g-C_(3)N_(4)具有较大的比表面积、较高的结晶度和较强的还原能力,能够提供足够的反应位点并促进光生电子-空穴转移,与ZnIn_(2)S_(4)形成Ⅱ型异质结后,提升了材料的光吸收能力和光生电子-空穴分离效率,明显增强了光催化制氢性能。10%S掺杂管状g-C_(3)N_(4)/层状ZnIn_(2)S_(4)的产氢速率最高,为1.64 mmol/(g·h),分别是S掺杂管状g-C_(3)N_(4)和层状ZnIn_(2)S_(4)的82倍和2.3倍。 展开更多
关键词 催化剂 复合材料 制氢 g-C_(3)N_(4) ZnIn_(2)S_(4)
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Mg改性CuZnAlY催化剂对CO_(2)加氢制甲醇性能影响
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作者 王雷 崔海涛 +4 位作者 李国强 李枫 李彪 刘刚 李磊 《洁净煤技术》 北大核心 2025年第3期72-82,共11页
CO_(2)加氢制备甲醇是实现“双碳”目标的重要途径,通过添加不同含量的Mg对CuZnAlY催化剂进行改性,并系统研究了其对CO_(2)加氢制甲醇性能的影响。通过XRD、TPR、TPD和XPS等表征手段对催化剂结构特征进行了系统分析。结果表明,Mg的添加... CO_(2)加氢制备甲醇是实现“双碳”目标的重要途径,通过添加不同含量的Mg对CuZnAlY催化剂进行改性,并系统研究了其对CO_(2)加氢制甲醇性能的影响。通过XRD、TPR、TPD和XPS等表征手段对催化剂结构特征进行了系统分析。结果表明,Mg的添加构筑了合适的碱性位点,增强了CO_(2)吸附能力,提升了CO_(2)转化率和甲醇选择性。其中CZAYM_(2.5)复合催化剂时空产率最高,在T=250℃,P=3.0 MPa,GHSV=4000 mL/(mL·h),反应气n(H2)∶n(CO_(2))=3∶1(物质的量比)条件下,CO_(2)转化率、甲醇选择性和甲醇时空产率分别达到了18.95%、51.49%和0.1549 g/(g·h)。在提高反应压力P=5.0 MPa条件下进行了720 h稳定性试验。结果表明:CO_(2)转化率达到了22.00%,CH_(3)OH选择性保持在63.00%左右,时空产率保持在0.2100 g/(g·h)左右,催化剂表现出良好的稳定性能。 展开更多
关键词 CO_(2)排放 CO_(2)加氢 甲醇 复合催化剂 Mg改性
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Polymer-encapsulated metal complex catalysts:An emerging and efficient platform for electrochemical CO_(2) reduction
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作者 Yingshuo Liu Shuaishuai Lyu +2 位作者 Fuli Wen Weixuan Nie Shuqing Wang 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2024年第5期33-50,共18页
Over the past decade,electrocatalytic reduction of CO_(2)has gained substantial attention.However,hardly any of the previous reviews have focused on the systematic discussion of polymer-molecular catalyst composites a... Over the past decade,electrocatalytic reduction of CO_(2)has gained substantial attention.However,hardly any of the previous reviews have focused on the systematic discussion of polymer-molecular catalyst composites as an emerging system for the electrochemical transformation of CO_(2)to value-added products.In this review,we first give a brief overview of the general features of solid-state and molecular catalysts,and then advance the discussion to polymer-catalyst composite systems,with particular emphasis on polymer-encapsulated molecular catalysts,where the coordination environment surrounding molecular catalysts can be modified via polymer encapsulation to promote the overall performance of CO_(2)electrocatalysis.The elucidation of the possible reaction mechanisms of this emerging electrocat-alytic system along with proposed optimization strategies is also summarized and discussed based on recently published reports,followed by the challenges and prospects of their industrial applications at the end of this review.From this review,we hope the audience can gain a comprehensive understanding of the electrocatalytic mechanism of the coordinating polymers and valuable insights into engineering the microenvironment surrounding the metal complexes for potential future research directions. 展开更多
关键词 Polymer-molecular catalyst composite Polymer encapsulation Coordination environment CO_(2)electrocatalysis Electrocatalytic mechanism
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Bi@C/NCN复合催化剂的制备及其光热催化CO_(2)还原性能研究
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作者 丁佳雨 王亚男 +1 位作者 徐松 李忠玉 《化工新型材料》 北大核心 2025年第4期144-150,共7页
在传统光催化CO_(2)反应中引入热能是提高转化效率的新方法。通过超声辅助法将Bi@C纳米颗粒加载到三维蜂窝状氮化碳(NCN)上制备了Bi@C/NCN复合催化剂,并将其装载到碳化的天然松木表面,组装了气-液-固三相CO_(2)光热催化还原系统。在全... 在传统光催化CO_(2)反应中引入热能是提高转化效率的新方法。通过超声辅助法将Bi@C纳米颗粒加载到三维蜂窝状氮化碳(NCN)上制备了Bi@C/NCN复合催化剂,并将其装载到碳化的天然松木表面,组装了气-液-固三相CO_(2)光热催化还原系统。在全光谱照射下,Bi@C与NCN质量比为60%的复合催化剂的CO_(2)还原为CO活性达到41.50μmol/(g·h),是纯NCN的2.65倍。其中,Bi@C纳米颗粒能够吸收近红外光并产生热电子,从而提高催化剂的局部温度。此外,得益于三相系统的设计,将光热效应产生的大部分热量局限在催化剂表面,提高了反应温度并减少了能量损失,为CO_(2)还原提供了动力学优势。 展开更多
关键词 光热催化CO_(2)还原 蜂窝状氮化碳 复合催化剂
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Ni/yMnO_(x)-ZrO_(2)催化愈创木酚加氢制环己醇的性能
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作者 凤雏 涂椿滟 +2 位作者 刘路含 刘春婷 黄伟 《石油炼制与化工》 北大核心 2025年第3期8-17,共10页
采用行星球磨法合成了不同Mn/Zr摩尔比的复合氧化物(yMnO_(x)-ZrO_(2)),并负载Ni制备了一系列的Ni/yMnO_(x)-ZrO_(2)催化剂。通过X射线衍射、NH_(3)程序升温脱附、吡啶吸附红外光谱、N_(2)物理吸附-脱附、H_(2)程序升温还原对催化剂进... 采用行星球磨法合成了不同Mn/Zr摩尔比的复合氧化物(yMnO_(x)-ZrO_(2)),并负载Ni制备了一系列的Ni/yMnO_(x)-ZrO_(2)催化剂。通过X射线衍射、NH_(3)程序升温脱附、吡啶吸附红外光谱、N_(2)物理吸附-脱附、H_(2)程序升温还原对催化剂进行了物化性质的表征。以愈创木酚为原料,考察了Ni/yMnO_(x)-ZrO_(2)系列催化剂在愈创木酚加氢转化反应中的催化性能。结果表明:Mn的掺杂促进了Ni/yMnO_(x)-ZrO_(2)催化剂弱酸及中强酸的形成,有利于愈创木酚通过脱甲氧基形成以苯酚为中间体的反应路径制备环己醇;升高反应温度和延长反应时间均有利于提高环己醇收率,但也会导致环己醇过度加氢转化为环己烷;当Mn/Zr摩尔比为0.20时,Ni_(0.20)MnO_(x)-ZrO_(2)催化剂表现出优异的催化性能,在反应温度为260℃、H_(2)初始压力为2.0 MPa、反应时间为1.5 h的条件下,愈创木酚转化率和环己醇选择性分别为100%和63.5%。 展开更多
关键词 复合氧化物 NI基催化剂 ZrO_(2) MN掺杂 愈创木酚 环己醇
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CoS_(2)-MoS_(2)复合催化剂的水热合成及电解水催化性能
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作者 浮琳萍 鲁耀宗 +3 位作者 李明 张龙华 何玉 刘伟 《河南科技大学学报(自然科学版)》 北大核心 2025年第3期35-44,54,共11页
目前电解水制氢所用催化剂价格昂贵,且各类催化大多功能单一,不利于电解水的工程化应用。针对以上问题,结合二硫化钼材料和钴硫化物的催化反应特点,通过一步水热法合成具有双功能催化活性的非贵金属CoS_(2)-MoS_(2)复合催化剂。利用场... 目前电解水制氢所用催化剂价格昂贵,且各类催化大多功能单一,不利于电解水的工程化应用。针对以上问题,结合二硫化钼材料和钴硫化物的催化反应特点,通过一步水热法合成具有双功能催化活性的非贵金属CoS_(2)-MoS_(2)复合催化剂。利用场发射扫描电子显微镜(FESEM)、高分辨透射电子显微镜(HRTEM)、X射线衍射(XRD)、X射线光电子能谱(XPS)以及电催化测试等手段对不同钴钼比的CoS_(2)-MoS_(2)样品进行表征和性能分析。实验结果表明;当钴钼摩尔比为1∶3时,CoS_(2)-MoS_(2)样品呈现出微米花状形貌结构,并表现出最优的催化活性。在0.1 M KOH电解液中,析氧反应(OER)的过电位比纯CoS_(2)降低了约128 mV,而析氢反应(HER)的过电位比纯MoS_(2)降低了约131 mV。在1 M KOH电解液中,CoS_(2)-1-3分别连续进行OER和HER过程50 h后,其电流密度仍能保持在99.38%和84.13%,表明其具有良好的电催化稳定性。当复合催化剂同时作为阳极和阴极进行全水解时,仅需1.77 V即可达到10 mA·cm^(-2)的电流密度,且稳定运行50 h后电流密度保持率为89.08%。 展开更多
关键词 二硫化钼(MoS_(2)) 二硫化钴(CoS_(2)) 析氧反应 析氢反应 复合催化剂 双功能催化 电解水
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磁性Ag_(3)PO_(4)/CoFe_(2)O_(4)/ZnO复合催化剂的制备及光催化降解罗丹明B的研究
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作者 王喜全 吕艳丽 +1 位作者 华丹红 陈鹏飞 《化学研究与应用》 北大核心 2025年第8期2161-2169,共9页
为提高Ag_(3)PO_(4)光催化稳定性和光催化活性,采用共沉淀和水热合成方法对Ag_(3)PO_(4)进行CoFe_(2)O_(4)材料掺杂与ZnO半导体复合改性,制备磁性Ag_(3)PO_(4)/CoFe_(2)O_(4)/ZnO复合催化剂,并通过XRD、EDS、SEM等表征手段对催化剂的晶... 为提高Ag_(3)PO_(4)光催化稳定性和光催化活性,采用共沉淀和水热合成方法对Ag_(3)PO_(4)进行CoFe_(2)O_(4)材料掺杂与ZnO半导体复合改性,制备磁性Ag_(3)PO_(4)/CoFe_(2)O_(4)/ZnO复合催化剂,并通过XRD、EDS、SEM等表征手段对催化剂的晶型结构、能带结构、微观形貌等进行探究。在此基础上,以罗丹明B为降解对象,研究复合催化剂的光催化性能及催化机制。研究结果表明:CoFe_(2)O_(4)和ZnO的加入使得Ag_(3)PO_(4)对光的吸收边带发生了红移,由550 nm红移至600 nm;在可见光照射下对罗丹明B表现出优异的催化降解性能:当罗丹明B的初始浓度为10 m/L、催化剂投加浓度为2.0 g/L、RhB的初始pH值为5时,脱色率达到98%。复合催化剂在多次回收使用后,对罗丹明B依旧具有较高的脱色率,其化学稳定性较好。 展开更多
关键词 Ag_(3)PO_(4)/CoFe_(2)O_(4)/ZnO复合催化剂 催化降解能力 罗丹明B
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工业酸洗铁泥衍生CoFe_(2)O_(4)复合催化剂活化过硫酸盐降解盐酸四环素试验
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作者 李明 朱凯 +1 位作者 刘磊 刘玉灿 《净水技术》 2025年第7期123-129,共7页
【目的】该文章旨在探索工业废弃物再利用的环境与经济价值,特别是利用钢铁工业的酸洗铁泥作为原料,通过水热法制备高效催化剂,用于水处理领域,去除水中的抗生素类污染物盐酸四环素(TCH),以促进资源的循环利用和减少环境污染。【方法】... 【目的】该文章旨在探索工业废弃物再利用的环境与经济价值,特别是利用钢铁工业的酸洗铁泥作为原料,通过水热法制备高效催化剂,用于水处理领域,去除水中的抗生素类污染物盐酸四环素(TCH),以促进资源的循环利用和减少环境污染。【方法】文章采用水热法将酸洗铁泥转化为CoFe_(2)O_(4)复合催化剂,并构建了复合催化剂/过硫酸盐(PMS)高级氧化体系,通过研究pH、催化剂和PMS的投加量等条件,优化反应体系,并利用自由基捕捉试验分析降解机理。【结果】在pH值为3.5~10.0、复合催化剂投加量为0.3 g/L、PMS投加量为0.6 g/L的最佳条件下,反应30 min后TCH的去除率可达80%。CoFe_(2)O_(4)复合催化剂在多次使用后仍保持较高的催化活性和稳定性。自由基捕捉试验证实,·OH与SO_(4)^(·-)是TCH降解过程中的主要活性物种,表明该体系通过自由基氧化机制高效降解污染物。文章成功实现了工业废弃物酸洗铁泥的高值化利用,制备的CoFe_(2)O_(4)复合催化剂在高级氧化体系中表现出优异的催化性能和稳定性。【结论】该技术不仅降低了催化剂制备成本,还为水污染控制提供了一种绿色可持续的解决方案,对推动资源循环利用和环境保护具有重要意义。 展开更多
关键词 酸洗铁泥 水热反应 CoFe_(2)O_(4) 复合催化剂 高级氧化 自由基
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Li-CO_(2)电池过渡金属基正极催化剂设计策略研究进展
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作者 窦世娜 王士东 +4 位作者 李现红 马建平 高海洋 王金刚 马文庆 《中国有色冶金》 北大核心 2025年第5期14-28,共15页
在能源转型及碳中和的双重驱动下,Li-CO_(2)电池因其高效储能和CO_(2)资源化利用潜力成为前沿储能技术,但其发展受限于放电产物Li_(2)CO_(3)的高分解势垒及缓慢反应动力学,为推进高性能Li-CO_(2)电池发展,诸多学者致力于探索正极催化剂... 在能源转型及碳中和的双重驱动下,Li-CO_(2)电池因其高效储能和CO_(2)资源化利用潜力成为前沿储能技术,但其发展受限于放电产物Li_(2)CO_(3)的高分解势垒及缓慢反应动力学,为推进高性能Li-CO_(2)电池发展,诸多学者致力于探索正极催化剂设计策略,旨在提高催化剂性能,从而提升CO_(2)还原与CO_(2)析出反应可逆性与动力学。本文综述了Li-CO_(2)电池过渡金属基催化剂最新研究进展,重点探讨了通过催化剂成分与结构设计来提高催化位点活性和增加催化位点密度的关键作用:一方面,通过缺陷工程、双金属、合金化以及异质界面构建,可提高催化位点活性、优化催化剂电子特性、增强对反应物及中间体的吸附活化能力,进而调控反应路径并抑制副反应;另一方面,借助多孔结构设计、单原子催化剂以及晶面调控,可显著增加活性位点密度与利用效率,优化传质与电荷传输通道,改善放电产物形貌分布。未来的研究应着重探明催化剂对电池反应路径的影响机制,实现电池反应路径调控,为高性能、高可逆性Li-CO_(2)电池正极催化剂的精准设计提供理论支撑,推动其迈向实际应用。 展开更多
关键词 Li-CO_(2)电池 过渡金属 催化剂设计 结构设计 催化位点活性 催化位点密度 CO_(2)还原 CO_(2)析出
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一锅煮制备Bi_(2)MoO_(6)/BiOI复合材料及可见光降解盐酸四环素的研究
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作者 梁诗婷 易均辉 +5 位作者 陈展鸿 肖小静 张紫科 林泽波 黄子颖 徐进 《工业催化》 2025年第8期41-49,共9页
钼酸铋在水体污染物降解方面具有广阔的应用前景,但单一钼酸铋的光生电子-空穴复合快,光催化效率不高。因此采用一锅煮水热法制备不同比例的Bi_(2)MoO_(6)/BiOI复合材料,利用XRD、SEM、TEM、XPS和DRS对其微观形貌、物相组成等特性进行表... 钼酸铋在水体污染物降解方面具有广阔的应用前景,但单一钼酸铋的光生电子-空穴复合快,光催化效率不高。因此采用一锅煮水热法制备不同比例的Bi_(2)MoO_(6)/BiOI复合材料,利用XRD、SEM、TEM、XPS和DRS对其微观形貌、物相组成等特性进行表征,在可见光照射下评价其降解盐酸四环素(TC)的活性。结果表明,1∶5Bi_(2)MoO_(6)/BiOI降解效率达到最佳,在100 min内对盐酸四环素的降解率达到81.0%,且重复4次降解后仍保持较高的催化活性,原因是Bi_(2)MoO_(6)/BiOI复合材料生成超氧自由基,加速了光生电子-空穴对的快速分离。该材料在环境治理和保护方面具有潜在的应用价值。 展开更多
关键词 催化剂工程 光催化 Bi_(2)MoO_(6)/BiOI复合材料 盐酸四环素
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