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Structure and Performance of Fe-N_x-C Catalyst for Oxygen Reduction Reaction Prepared by Vacuum Casting Method and the Second Pyrolysis 被引量:1
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作者 钱亚声 童磊 +2 位作者 邵宗贵 囤荣敏 李文木 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2018年第6期937-947,共11页
Affordable non-precious metal(NPM) catalysts played a vital role in the wide application of polymer electrolyte membrane fuel cells(PEMFC). In current work, a facile vacuum casting reacting method based on vacuum ... Affordable non-precious metal(NPM) catalysts played a vital role in the wide application of polymer electrolyte membrane fuel cells(PEMFC). In current work, a facile vacuum casting reacting method based on vacuum casting was introduced to prepare Fe-N_x-C oxygen reduction reaction(ORR) catalysts with high efficient in acid medium. The catalysts were prepared with ammonium ferrous sulfate hexahydrate(AFS) and 1,10-phenanthroline monohydrate utilizing homemade mesoporous silica template. The heat treatment and its influence on structure and performance were systematically evaluated to achieve superior ORR performance and some clues were found. And 850 ℃ was found to be the best temperature for the first and second pyrolysis. The linear sweep voltammetry(LSV) results showed that there were only 18 mV slightly negative shifts of half-wave potential(E_(1/2)) of the optimal catalyst(749 mV) compared with the commercial Pt/C(20 μg·Pt·cm^-2). Besides, I850 R also showed better electrochemical stability and methanol-tolerance than that of Pt/C. All evidences proved that our vacuum casting reacting strategy and heat treatment process were prospective for the future R&D of high performance Fe-N_x-C ORR catalysts. 展开更多
关键词 oxygen reduction reaction acid medium vacuum casting reacting method temperature affected structure second pyrolysis
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Synthesis of carbon nanotubes by catalytic pyrolysis method with Feitknecht compound as precursor of NiZnAl catalyst
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作者 Yan Xiaoqi Liu Quanrun +3 位作者 Zhang Songlin Zhang Kun Chen Jiuling Li Yongdan 《合成化学》 CAS CSCD 2004年第z1期130-130,共1页
关键词 carbon nanotubes Feitknecht compound nickel-zinc-alumina catalyst catalyticpyrolysis method
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Investigation on the pyrolysis behaviors and kinetics of walnut shell lignocellulosic biomass with additives
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作者 Wei Zhang Yuming Zhang +5 位作者 Haixin Wu Xinyu Yang Pei Qiao Jiazhou Li Zhewen Chen Yan Wang 《Chinese Journal of Chemical Engineering》 2025年第4期303-314,共12页
Utilizing calcium aluminate(CaAlO)as a catalyst in lignocellulosic biomass pyrolysis offers dual advantages of cost saving and mitigating environmental pollution from industrial waste.This study employs kinetic analys... Utilizing calcium aluminate(CaAlO)as a catalyst in lignocellulosic biomass pyrolysis offers dual advantages of cost saving and mitigating environmental pollution from industrial waste.This study employs kinetic analysis to validate the catalytic effect of CaAlO on biomass pyrolysis.Thermalgravimetric analysis of walnut shell pyrolysis was conducted,incorporating CaAlO,CaO,and Al_(2)O_(3) additives to examine catalytic pyrolysis and gas release characteristics.The results reveal that CaAlO exhibits a catalytic effect similar to that of CaO and Al_(2)O_(3),suggesting its potential as an effective catalyst.Activation energies obtained without additive and with CaAlO,CaO,and Al_(2)O_(3) by Friedman method are 184,178,158,and 176 kJ·mol^(-1),while by Flynn-Wall-Ozawa(FWO)method are 186,179,160,177 kJ·mol^(-1).Finally,distributed activation energy model(DAEM)analysis was performed,and the obtained parameters were successfully coupled into three-dimensional numerical simulation with some simplifications in the DAEM integration to reduce calculation cost,showing its potential applicability in biomass pyrolysis investigation. 展开更多
关键词 Lignocellulosic biomass pyrolysis kinetics Friedman method FWO method DAEM method
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Orthogonality conditions and analytical response solutions of damped gyroscopic double-beam system:an example of pipe-in-pipe system
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作者 Jinming FAN Zhongbiao PU +2 位作者 Jie YANG Xueping CHANG Yinghui LI 《Applied Mathematics and Mechanics(English Edition)》 2025年第5期927-946,共20页
The double-beam system is a crucial foundational structure in industry,with extensive application contexts and significant research value.The double-beam system with damping and gyroscopic effects is termed as the dam... The double-beam system is a crucial foundational structure in industry,with extensive application contexts and significant research value.The double-beam system with damping and gyroscopic effects is termed as the damped gyroscopic double-beam system.In such systems,the orthogonality conditions of the undamped double-beam system are no longer applicable,rendering it impossible to decouple them in modal space using the modal superposition method(MSM) to obtain analytical solutions.Based on the complex modal method and state space method,this paper takes the damped pipe-in-pipe(PIP) system as an example to solve this problem.The concepts of the original system and adjoint system are introduced,and the orthogonality conditions of the damped PIP system are given in the state-space.Based on the derived orthogonality conditions,the transient and steady-state response solutions are obtained.In the numerical discussion section,the convergence and accuracy of the solutions are verified.In addition,the dynamic responses of the system under different excitations and initial conditions are studied,and the forward and reverse synchronous vibrations in the PIP system are discussed.Overall,the method presented in this paper provides a convenient way to analyze the dynamics of the damped gyroscopic double-beam system. 展开更多
关键词 fluid-conveying pipe transverse vibration pipe-in-pipe(pip)system gyroscopic double-beam system complex modal superposition method(MSM) analytical solution
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利用束丝复合材料对PIP工艺制备2D-SiC_f/SiC复合材料力学性能进行表征 被引量:3
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作者 刘海韬 程海峰 +3 位作者 王军 唐耿平 周旺 郑文伟 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2009年第10期1860-1863,共4页
为了找到一种能有效对陶瓷基复合材料先驱体浸渍裂解(PIP)工艺参数进行优化的方法,提出利用束丝复合材料对二维复合材料力学性能进行表征的方案。对5种PIP工艺条件制备的束丝以及二维SiCf/SiC复合材料在不同PIP工艺条件下力学性能变化... 为了找到一种能有效对陶瓷基复合材料先驱体浸渍裂解(PIP)工艺参数进行优化的方法,提出利用束丝复合材料对二维复合材料力学性能进行表征的方案。对5种PIP工艺条件制备的束丝以及二维SiCf/SiC复合材料在不同PIP工艺条件下力学性能变化规律进行了研究,并对采用束丝复合材料对二维复合材料力学性能表征的有效性进行了分析。研究表明,束丝复合材料和二维复合材料力学性能随PIP工艺的变化规律完全相同,这是因为两种复合材料界面、纤维损伤等特性基本相同。采用强度比对两种复合材料力学性能一致程度进行了表征,结果表明两者一致性较好,但随PIP工艺复杂程度的提高,两者一致性降低。利用束丝复合材料可以对二维复合材料力学性能进行较好的表征,可对二维等实体复合材料制备工艺进行初步优化,从而使材料工艺设计效率大为提高。 展开更多
关键词 pip工艺 束丝复合材料 SICF/SIC 力学性能
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SiC纤维表面去碳处理对PIP-SiC_f/SiC复合材料力学性能以及界面影响 被引量:3
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作者 刘海韬 程海峰 +3 位作者 王军 唐耿平 周旺 郑文伟 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2011年第5期867-870,共4页
采用强度测试、SEM、HRTEM等分析测试手段对纤维表面去碳前后SiC纤维强度、复合材料力学性能、纤维表面形貌、复合材料断口形貌以及复合材料界面特征进行分析表征。结果表明,去碳处理后,纤维表面的固有缺陷暴露出来,纤维强度下降约15%,... 采用强度测试、SEM、HRTEM等分析测试手段对纤维表面去碳前后SiC纤维强度、复合材料力学性能、纤维表面形貌、复合材料断口形貌以及复合材料界面特征进行分析表征。结果表明,去碳处理后,纤维表面的固有缺陷暴露出来,纤维强度下降约15%,但由其制备的复合材料强度下降只有原纤维制备复合材料的1/6;复合材料断口非常平整,纤维增韧效果差。分析表明,由于去碳后纤维表面缺陷增多,界面的物理结合增强以及由于基体开裂导致的纤维物理损伤加剧;去碳处理后纤维表面化学反应活性中心明显增加,导致界面化学结合和纤维化学损伤加剧。过强的界面结合和低的纤维就位强度使复合材料力学性能严重恶化。 展开更多
关键词 先驱体浸渍裂解(pip)工艺 去碳 2D-SiCf/SiC 力学性能 界面 纤维损伤
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Effect of preparation methods on the adsorption property of municipal solid waste-based carbon materials 被引量:1
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作者 宋敏 唐心红 +1 位作者 唐美 卫月星 《Journal of Southeast University(English Edition)》 EI CAS 2016年第2期208-214,共7页
Three different preparation methods including steam physical activation, catalytic carbonation and KOH chemical activation methods were used to prepare municipal solid waste- based carbon materials. The methylene blue... Three different preparation methods including steam physical activation, catalytic carbonation and KOH chemical activation methods were used to prepare municipal solid waste- based carbon materials. The methylene blue (MB) adsorption value was applied to evaluate the adsorption capabilities of the prepared carbon materials. The effects of preparation methods on adsorption capability and yield of products were investigated. The yield of carbon materials with the catalytic carbonation method is the highest, and the KOH activation method is the second level. Considering the adsorption performance, the KOH activation method is much more favorable. Among the different components of municipal solid waste-based carbon materials, the adsorption properties of the single component of paperboard, the double components of tire and paperboard, the triple components of tire, paperboard and polyvinyl chloride (PVC), and the multi-component mixtures are better than those of other single-, double-, triple- and multi-component mixtures, respectively. 展开更多
关键词 pyrolysis preparation methods WASTE ADSORPTION activated carbon
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PIP工艺对2D高硅氧/甲基硅树脂复合材料结构与性能的影响 被引量:1
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作者 王磊 黄玉东 +1 位作者 刘丽 张建军 《固体火箭技术》 EI CAS CSCD 北大核心 2008年第5期531-534,共4页
研究了不同浸渍工艺对2D高硅氧织物增强甲基硅树脂复合材料结构与性能的影响。结果表明,复合材料的密度及抗氧化性随着浸渍循环次数和热裂解温度的增加而增加;当热裂解温度不高于400℃时,复合材料仍具有较好的假塑性;但当热裂解温度高于... 研究了不同浸渍工艺对2D高硅氧织物增强甲基硅树脂复合材料结构与性能的影响。结果表明,复合材料的密度及抗氧化性随着浸渍循环次数和热裂解温度的增加而增加;当热裂解温度不高于400℃时,复合材料仍具有较好的假塑性;但当热裂解温度高于400℃时,复合材料表现为典型的脆性断裂。当浸渍过程中热裂解温度为400℃、循环次数为2次时,500℃热处理20 m in的复合材料的室温弯曲强度最高,为49.8 MPa,比未处理的提高了150%。 展开更多
关键词 聚合物浸渍裂解 2D复合材料 甲基硅树脂 结构与性能
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CVI-PIP法制备连续纤维增韧碳化硅基复合材料的研究 被引量:1
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作者 曹静 王永锋 《铸造技术》 CAS 北大核心 2015年第2期325-327,共3页
CMC-SiC是航空航天等高科技领域不可缺少的材料。先驱体浸渍热解(PIP)和化学气相渗透(CVI)是制备CMC-SiC较为理想的方法。采用PIP和CVI相结合的技术制备了CMC-SiC。结果表明,制备CMC-SiC的最好工艺是初始进行短期的CVI过程,随后再进行... CMC-SiC是航空航天等高科技领域不可缺少的材料。先驱体浸渍热解(PIP)和化学气相渗透(CVI)是制备CMC-SiC较为理想的方法。采用PIP和CVI相结合的技术制备了CMC-SiC。结果表明,制备CMC-SiC的最好工艺是初始进行短期的CVI过程,随后再进行反复的PIP循环。 展开更多
关键词 连续纤维增韧碳化硅复合材料 化学气相渗透 先躯体侵渗热解
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Influence of carbon coating prepared by microwave pyrolysis on properties of LiNi_(1/3) Mn_(1/3) Co_(1/3) O_2
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作者 韩亚梅 张正富 +4 位作者 张利波 彭金辉 傅梦笔 C.SRINIVASAKANNAN 杜江 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第10期2971-2976,共6页
A novel synthesis method of carbon-coated LiNil/3Mnl/3COl/302 cathode material for lithium-ion battery was reported. The carbon coating was produced from a precursor, glucose, by microwave-pyrolysis method. The prepar... A novel synthesis method of carbon-coated LiNil/3Mnl/3COl/302 cathode material for lithium-ion battery was reported. The carbon coating was produced from a precursor, glucose, by microwave-pyrolysis method. The prepared powders were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray fluorescence (XRF) and charge/discharge tests. XRD results indicate that the carbon coating does not change the phase structure of LiNil/3Mnl/3C01/302 material. SEM results show that the surface of spherical carbon-coated material becomes rough. Electrochemical performance results show that the carbon coating can improve the cycling performance of LiNii/3Mnl/3C01/302. The specific discharge capacity retention of the carbon-coated LiNi1/3Mnt/3Col/30z reached 85.0%-96.0% at the 50th cycle at 0.2C rate, and the specific discharge capacity retention is improved at a high rate. 展开更多
关键词 lithium-ion battery cathode material carbon coating microwave pyrolysis method electrochemical performance
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PIP工艺制备C/Zr_(0.5)Hf_(0.5)C-SiC复合材料及其微观结构和弯曲性能 被引量:5
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作者 刘星煜 万帆 +4 位作者 高世涛 王衍飞 李端 李俊生 刘荣军 《材料工程》 EI CAS CSCD 北大核心 2023年第8期155-161,共7页
基于自制Zr_(0.5)Hf_(0.5)C先驱体和商业化液态聚碳硅烷,通过先驱体浸渍裂解(PIP)工艺成功制备C/Zr_(0.5)Hf_(0.5)C-SiC复合材料,研究纤维表面热解C涂层厚度对复合材料微观结构及弯曲性能的影响。结果表明:自制Zr_(0.5)Hf_(0.5)C先驱体... 基于自制Zr_(0.5)Hf_(0.5)C先驱体和商业化液态聚碳硅烷,通过先驱体浸渍裂解(PIP)工艺成功制备C/Zr_(0.5)Hf_(0.5)C-SiC复合材料,研究纤维表面热解C涂层厚度对复合材料微观结构及弯曲性能的影响。结果表明:自制Zr_(0.5)Hf_(0.5)C先驱体在1400℃下即可转化生成单一Zr_(0.5)Hf_(0.5)C固溶体。因具有良好的渗透性,转化生成的Zr_(0.5)Hf_(0.5)C基体同时存在于C/Zr_(0.5)Hf_(0.5)C-SiC复合材料的纤维束内和束间,呈包裹SiC基体的层状形貌。C/Zr_(0.5)Hf_(0.5)C-SiC复合材料主要由C,SiC和Zr_(0.5)Hf_(0.5)C相组成;具有不同热解C涂层厚度(0.67,0.84,1.36μm)的3组复合材料密度分别为2.07,1.99,1.98 g/cm^(3);随热解C涂层厚度的增加复合材料中SiC含量减少。弯曲加载中3组不同热解C涂层厚度复合材料均呈现假塑性断裂模式,弯曲强度,弯曲模量和断裂韧度分别在410 MPa,60 GPa和15.6 MPa·m^(1/2)以上。良好的界面结合和预先引入的SiC基体是C/Zr_(0.5)Hf_(0.5)C-SiC复合材料获得优良弯曲性能的关键。 展开更多
关键词 Zr_(0.5)Hf_(0.5)C 超高温陶瓷 先驱体浸渍裂解 微观结构 弯曲性能
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PREPARATION OF MULTI-WALLED CARBON NANOTUBES USING NiO CATALYST SYNTHESIZED BY HYDROTHERMAL METHOD 被引量:3
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作者 Y.J.Zhu Y.L.Chen +5 位作者 X.M.Xue Y.M.Chen C.Y.Wu T.C.Kuang S.H.Li H.Y.Zhang 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2003年第5期416-420,共5页
The Ni(OH)2/SiO2 binary colloid was prepared using Ni(NO3)2.6H2O and (C2H5O)4SiO4 as starting materials and was used to form NiO/SiO2. composite powder by hydrothermal method and desiccant method in open air respectiv... The Ni(OH)2/SiO2 binary colloid was prepared using Ni(NO3)2.6H2O and (C2H5O)4SiO4 as starting materials and was used to form NiO/SiO2. composite powder by hydrothermal method and desiccant method in open air respectively. Multi-walled carbon nanotubes (MWCNTs) were synthesized respectively by chemical vapor deposition using the NiO/SiO2 catalyst prepared by different methods. The phase and morphology of the catalysts and the morphology, output yield and purity of MWCNTs were compared by XRD, TEM and SEM. The results show that the catalyst powder prepared by hydrothermal method, compared with that by desiccant method, is smaller, better dispersion and has stronger catalytic activity. Pure MWCNTs with smaller tube diameter and narrow range could be obtained at a high yield using that NiO/SiO2 powder prepared by hydrothermal method as catalyst. 展开更多
关键词 hydrothermal method dry method at atmosphere carbon nan- otube catalytic pyrolysis
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Disposal methods for used passenger car tires: One of the fastest growing solid wastes in China 被引量:2
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作者 Biaohua Chen Dahai Zheng +8 位作者 Ruinian Xu Shuai Leng Lili Han Qianqian Zhang Ning Liu Chengna Dai Bin Wu Gangqiang Yu Jie Cheng 《Green Energy & Environment》 SCIE EI CSCD 2022年第6期1298-1309,共12页
With the rapid growth in the number of passenger cars(PCs)in China over the past decades,more than ten million tons of used tires have already become solid wastes and subsequently caused serious environmental issues.D... With the rapid growth in the number of passenger cars(PCs)in China over the past decades,more than ten million tons of used tires have already become solid wastes and subsequently caused serious environmental issues.Due to the presence of synthetic rubber in PC tires,waste PC tires cannot be disposed through rubber reclaiming technology.Thus,waste PC tires have become one of fastest growing solid wastes in China.First,the current disposal capacity of the pyrolysis method,regarded as a promising technology for the disposal of waste PC tires,is surveyed and compared with other disposal methods mentioned in previous papers.Second,this work establishes a model to predict the total number of waste PC tires in the next five years depending on the rate of PC growth and current waste tire disposal capacity.Moreover,pyrolysis is evaluated on 15 collected waste PC tires selected from the most representative tire brands in the Chinese market.The corresponding results imply that~68.5%of S was into oil and~44.3%N and large amount of heavy metals resided in solid carbon which severely limit further applications.Finally,a new pyrolysis technology is introduced that may represent a solution to the limits in the application of tire disposal methods and relief for the coming waste tire crisis. 展开更多
关键词 Waste PC tire Disposal method pyrolysis Disposal capacity
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正交铺层PIP-SiC_(f)/SiC复合材料的水淬失效行为 被引量:2
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作者 高晔 姜卓钰 +3 位作者 周怡然 吕晓旭 宋伟 焦健 《材料工程》 EI CAS CSCD 北大核心 2022年第3期166-172,共7页
铺层方式是影响预浸料铺贴工艺制备SiC_(f)/SiC复合材料抗热震性能的关键因素之一。以先驱体浸渍裂解(PIP)工艺制备的SiC_(f)/SiC复合材料为研究对象,基于内聚力模型,对不同正交铺层方式的方形试样开展1200℃高温水淬实验及有限元仿真... 铺层方式是影响预浸料铺贴工艺制备SiC_(f)/SiC复合材料抗热震性能的关键因素之一。以先驱体浸渍裂解(PIP)工艺制备的SiC_(f)/SiC复合材料为研究对象,基于内聚力模型,对不同正交铺层方式的方形试样开展1200℃高温水淬实验及有限元仿真研究。结果表明:水淬过程中试样表面温度急剧下降,芯部与表面存在较大温差,顶角与芯部温差最高可达1077℃,导致复合材料的主要失效模式为层间开裂和基体开裂,且试样层间开裂位置与铺层方式有关。由模拟结果可知,由于正交铺层方式的不同,试样的层间开裂位移也存在显著差异:[0/90]与[0/90/0]两种铺层方式层间主裂纹开裂位移约为0.61 mm,而[0/0/90/90]铺层主开裂位移仅为0.04 mm。此外,随着水淬时间的增加,层间主裂纹开裂位移逐渐增大,而次裂纹在开裂后逐渐发生闭合现象。 展开更多
关键词 SiC_(f)/SiC复合材料 铺层方式 水淬实验 pip工艺 内聚力模型
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Type Ⅰ kerogen-rich oil shale from the Democratic Republic of the Congo: mineralogical description and pyrolysis kinetics
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作者 Rajaa Bouamoud Ely Cheikh Moine +3 位作者 Raphaèl Mulongo-Masamba Adnane El Hamidi Mohammed Halim Said Arsalane 《Petroleum Science》 SCIE CAS CSCD 2020年第1期255-267,共13页
The Democratic Republic of the Congo holds important reserves of oil shale which is still under geological status.Herein,the characterization and pyrolysis kinetics of typeⅠkerogen-rich oil shale of the western Centr... The Democratic Republic of the Congo holds important reserves of oil shale which is still under geological status.Herein,the characterization and pyrolysis kinetics of typeⅠkerogen-rich oil shale of the western Central Kongo(CK)were investigated.X-ray diffraction,Fourier-transform infrared spectroscopy and thermal analysis(TG/DTA)showed that CK oil shale exhibits a siliceous mineral matrix with a consistent organic matter rich in aliphatic chains.The pyrolysis behavior of kerogen revealed the presence of a single mass loss between 300 and 550°C,estimated at 12.5%and attributed to the oil production stage.Non-isothermal kinetics was performed by determining the activation energy using the iterative isoconversional model-free methods and exhibits a constant value with E=211.5±4.7 kJ mol.1.The most probable kinetic model describing the kerogen pyrolysis mechanism was obtained using the Coats–Redfern and Arrhenius plot methods.The results showed a unique kinetic triplet confirming the nature of kerogen,predominantly typeⅠand reinforcing the previously reported geochemical characteristics of the CK oil shale.Besides,the calculation of thermodynamic parameters(ΔH~*,ΔS~*andΔG~*)corresponding to the pyrolysis of typeⅠkerogen revealed that the process is non-spontaneous,in agreement with DTA experiments. 展开更多
关键词 TypeⅠkerogen pyrolysis kinetics Isoconversional methods MINERALOGY Central Kongo oil SHALE
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Mechanism,Kinetics,and Thermodynamic Characteristics for the Demetallization of Used Lubricating Oil via Pyrolysis
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作者 Yang Haiyu Jiang Zhenxin +2 位作者 Chu Qingyan Jiang Peng Wang Ming 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS CSCD 2023年第2期113-127,共15页
This study analyzed the pyrolysis mechanism,developed a pyrolysis kinetic model,and determined the corresponding thermodynamic parameters for the removal of calcium from used lubricating oil using sulfurized calcium a... This study analyzed the pyrolysis mechanism,developed a pyrolysis kinetic model,and determined the corresponding thermodynamic parameters for the removal of calcium from used lubricating oil using sulfurized calcium alkyl phenolate(T-115B)as a model compound.The pyrolysis process and products were evaluated by Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy.Visual inspection indicated that the removal of calcium from T-115B depended primarily on the destruction of micelles caused by the pyrolysis of compounds at high temperatures.The pyrolysis characteristics of T-115B at different heating rates were investigated by thermogravimetry and differential thermal analysis,which revealed two distinct pyrolysis phases.Thus,the pyrolysis mechanism can be described by a twostep model.The activation energy and thermodynamic parameters(ΔH,ΔG,andΔS)were determined by applying the Kissinger-Akahira-Sunose,Flynn-Wall-Ozawa,Friedman,and Starink methods;the average activation energies for T-115B pyrolysis obtained using these methods were 115.80,119.84,124.96,and 116.14 kJ/mol,respectively.Further,both stages of the pyrolysis reaction followed Fn mechanisms with n=1.39 in the first stage and n=0.86 in the second stage.This study provides reliable and effective pyrolysis models along with kinetic and thermodynamic parameters to facilitate the largescale industrial application of used lubricating oil. 展开更多
关键词 used lubricating oil sulfurized calcium alkyl phenolate pyrolysis decomposition kinetics THERMODYNAMICS non-isothermal method
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Verification of an Explicitly Coupled Thermal-Phase Field-Mechanical Electromagnetic (TPME) Framework by the Method of Manufactured Solutions
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作者 Travis S. Ramsay 《Open Journal of Modelling and Simulation》 2021年第1期1-25,共25页
An explicitly coupled two-dimensional (2D) multiphysics finite element method (FEM) framework comprised of thermal, phase field, mechanical and electromagnetic (TPME) equations was developed to simulate the conversion... An explicitly coupled two-dimensional (2D) multiphysics finite element method (FEM) framework comprised of thermal, phase field, mechanical and electromagnetic (TPME) equations was developed to simulate the conversion of solid kerogen in oil shale to liquid oil through </span><i><span style="font-family:Verdana;font-size:12px;">in-situ</span></i><span style="font-family:Verdana;font-size:12px;"> pyrolysis by radio frequency heating. Radio frequency heating as a method of <i></span><i><span style="font-family:Verdana;font-size:12px;">in-situ</span></i><span style="font-family:Verdana;font-size:12px;"></i> pyrolysis represents a tenable enhanced oil recovery method, whereby an applied electrical potential difference across a target oil shale formation is converted to thermal energy, heating the oil shale and causing it to liquify to become liquid oil. A number of <i></span><i><span style="font-family:Verdana;font-size:12px;">in-situ</span></i><span style="font-family:Verdana;font-size:12px;"></i> pyrolysis methods are reviewed but the focus of this work is on the verification of the TPME numerical framework to model radio frequency heating as a potential dielectric heating process for enhanced oil recovery.</span></span><span style="font-size:10pt;font-family:""> </span><span style="font-family:Verdana;">Very few studies exist which describe production from oil shale;furthermore, there are none that specifically address the verification of numerical models describing radio frequency heating. As a result, the Method of Manufactured Solutions (MMS) was used as an analytical verification method of the developed numerical code. Results show that the multiphysics finite element framework was adequately modeled enabling the simulation of kerogen conversion to oil as a part of the analysis of a TPME numerical model. 展开更多
关键词 Radio Frequency Heating In-Situ pyrolysis Oil Shale MULTIPHYSICS Explicit Coupling Finite Element method method of Manufactured Solutions
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基于复杂焊接结构件的PIP处理工艺研究
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作者 王永协 《新技术新工艺》 2021年第2期27-31,共5页
贮存架导轨是某型船舶自动化库设备用精密导向部件与受力部件,该型导轨是焊接结构件,形状比较复杂,加工时很容易发生变形。该型贮存架导轨在机械加工完成后应用了表面PIP处理新工艺,利用正交试验法对PIP处理工艺参数温度、时间、渗剂浓... 贮存架导轨是某型船舶自动化库设备用精密导向部件与受力部件,该型导轨是焊接结构件,形状比较复杂,加工时很容易发生变形。该型贮存架导轨在机械加工完成后应用了表面PIP处理新工艺,利用正交试验法对PIP处理工艺参数温度、时间、渗剂浓度3个因素进行分析,通过对零件的形变和表层硬度的数据统计总结发现,各因素对表层硬度、变形量的影响程度为:温度趋势变化最大,保温时间次之,渗剂浓度的变化趋势最小。得到了PIP处理的最佳工艺参数,解决了导轨加工变形难题,同时,也为复杂结构钢焊接件的PIP处理工艺提供了改进方向和理论支撑。 展开更多
关键词 焊接结构件 变形 pip处理 正交试验法 表层硬度 最佳工艺参数
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Nanosize Magnetic Films and Powders Prepared by Extraction-Pyrolysis Technique
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作者 N. Patrusheva Tamara P. Polyakova Klavdiya +3 位作者 A. Seredkin Vladimir N. Komogorcev Sergey V. Patrushev Valery S. Patrin Gennady 《材料科学与工程(中英文版)》 2010年第2期19-25,共7页
关键词 纳米磁性薄膜 粉体技术 萃取 铁氧体薄膜 制备 裂解 晶粒尺寸 磁性纳米微粒
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混合塑料热裂解反应动力学研究 被引量:1
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作者 姚璐 朱建华 +4 位作者 李术元 马跃 岳长涛 许强 刘宗鹏 《石油炼制与化工》 北大核心 2025年第4期114-122,共9页
选用聚丙烯(PP)、高密度聚乙烯(HDPE)及聚苯乙烯(PS)3种塑料颗粒,以不同的比例进行混合,利用热重试验装置分析3种塑料样品单独及混合热裂解的温度范围及失重规律,并采用Friedman、KAS和有限平行反应模型求解塑料的热裂解动力学参数。研... 选用聚丙烯(PP)、高密度聚乙烯(HDPE)及聚苯乙烯(PS)3种塑料颗粒,以不同的比例进行混合,利用热重试验装置分析3种塑料样品单独及混合热裂解的温度范围及失重规律,并采用Friedman、KAS和有限平行反应模型求解塑料的热裂解动力学参数。研究结果表明,几种塑料样品发生热裂解反应由易到难的顺序及由Friedman、KAS法计算的平均表观活化能由小到大的顺序均遵循:PS<PP-PS<PP-HDPE-PS(1∶1∶1)<HDPE-PS<PP-HDPE-PS(实际比例)<PP<PP-HDPE<HDPE。由有限平行反应模型估算的PP,HDPE,PS,PP-HDPE,PP-PS,HDPE-PS,PP-HDPE-PS(1∶1∶1),PP-HDPE-PS(实际比例)塑料样品的热裂解反应活化能分别集中在198~314,231~317,192~297,200~314,194~299,186~301,171~242,196~312 kJ/mol范围内。 展开更多
关键词 热裂解反应 动力学分析 有限平行反应模型 Friedman法 KAS法
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