Based on the background of ＂big-data-blowout＂, this thesis is about research on college English network teaching resources integration and utilization confronted with the chance of ＂data value, the data assets and ...Based on the background of ＂big-data-blowout＂, this thesis is about research on college English network teaching resources integration and utilization confronted with the chance of ＂data value, the data assets and data say＂, analyzing the inevitable challenge of ＂competition, digital divide and data privacy＂, discussing that the researchers should hold big data thinking of ＂peaks of road ＆ dances with wolves ＆ be interdependent＂, emphasizing the improvement from college English teacher＇s modem education technical information literacy[1] and putting forward to resource integration and utilization strategy in the era of big data.展开更多
CO_(2)capture and utilization(CCU)are two important processes to address the gigaton challenges in reducing greenhouse gas emissions.Given that both processes are energy-intensive,integrating CO_(2)capture and utiliza...CO_(2)capture and utilization(CCU)are two important processes to address the gigaton challenges in reducing greenhouse gas emissions.Given that both processes are energy-intensive,integrating CO_(2)capture and utilization(ICCU)can improve energy efficiency and reduce economic costs by eliminating steps such as CO_(2)concentration,storage,or capture media regeneration.Aiming at building a bridge between theoretical research and practical application,this review promotes the understanding of high-temperature ICCU,mild/low-temperature ICCU,and emerging electro-/photo-driven ICCU.The reaction mechanism and technical bottleneck are comprehensively evaluated,which could provide a perspective on the design principle of dualfunctional materials(DFMs)combining synergetic adsorptive and catalytic sites.On this basis,novel strategies are proposed from the viewpoint of chemical process intensification to strive for a thermodynamics and kinetics matching between the capture and in situ conversion processes.It is expected that this review can stimulate more research in the future involving expanding the product range,fabricating long-term DFMs,developing a workable reactor,optimizing operation conditions,and establishing an industrial demonstration.展开更多
Integrated CO_(2)capture and utilization(ICCU)technology requires dual functional materials(DFMs)to carry out the process in a single reaction system.The influence of the calcination atmosphere on efficiency of 4%Ru-8...Integrated CO_(2)capture and utilization(ICCU)technology requires dual functional materials(DFMs)to carry out the process in a single reaction system.The influence of the calcination atmosphere on efficiency of 4%Ru-8%Na_(2)CO_(3)-8%CaO/γ-Al_(2)O_(3)DFM is studied.The adsorbent precursors are first co-impregnated onto alumina and calcined in air.Then,Ru precursor is impregnated and four aliquotes are subjected to different calcination protocols:static air in muffle or under different mixtures(10%H_(2)/N_(2),50%H_(2)/N_(2)and N_(2))streams.Samples are characterized by XRD,N_(2)adsorption-desorption,H_(2)chemisorption,TEM,XPS,H_(2)-TPD,H_(2)-TPR,CO_(2)-TPD and TPSR.The catalytic behavior is evaluated,in cycles of CO_(2)adsorption and hydrogenation to CH_(4),and temporal evolution of reactants and products concentrations is analyzed.The calcination atmosphere influences the physicochemical properties and,ultimately,activity of DFMs.Characterization data and catalytic performance discover the acccomodation of Ru nanoparticles disposition and basic sites is mostly influencing the catalytic activity.DFM calcined under N_(2)flow(RuNaCa-N_(2))shows the highest CH_(4)production(449μmol/g at 370℃),because a well-controlled decomposition of precursors which favors the better accomodation of adsorbent and Ru phases,maximizing the specific surface area,the Ru-basic sites interface and the participation of different basic sites in the CO_(2)methanation reaction.Thus,the calcination in a N_(2)flow is revealed as the optimal calcination protocol to achieve highly efficient DFM for integrated CO_(2)adsorption and hydrogenation applications.展开更多
Direct air capture(DAC)is an emerging technology aimed at mitigating global warming.However,conventional DAC technologies and the subsequent utilization processes are complex and energy-intensive.An integrated system ...Direct air capture(DAC)is an emerging technology aimed at mitigating global warming.However,conventional DAC technologies and the subsequent utilization processes are complex and energy-intensive.An integrated system of direct air capture and utilization(IDACU)via in-situ catalytic conversion to fuels and chemicals is a promising approach,although it remains in the early stages of development.This review examines the current technical routes of IDACU,including solid-based dual-functional materials(DFMs)through thermo-catalysis,IDACU using liquid sorbents with thermo-catalysis,and non-thermal conversion methods.It covers the basic principles,reaction conditions,main products,material types,and the existing problems and challenges associated with these technical routes.Additionally,it discusses the recent advancements in solid-based DFMs for IDACU,with particular attention to the differences in material characteristics between carbon capture from flue gases(ICCU)and DAC.While IDACU technology holds significant promise,it still faces numerous challenges,especially in the design of advanced materials.展开更多
Integrated carbon capture and utilization(ICCU)has emerged as a promising strategy toward carbon neutrality.However,most existing studies rely on simulated flue gas compositions,neglecting the impact of common impurit...Integrated carbon capture and utilization(ICCU)has emerged as a promising strategy toward carbon neutrality.However,most existing studies rely on simulated flue gas compositions,neglecting the impact of common impurities such as sulfur oxides(SO_(x))and nitrogen oxides(NO_(x)),thereby limiting the practical industrial applicability of ICCU technologies.Herein,we systematically investigate the effects of SO_(2)and NO_(2)at various concentrations on the adsorption-catalysis performance based on a representative Ni-Ca dual functional material(DFM)in the ICCU-dry reforming of methane(ICCU-DRM)process.Exposure to 100 ppm SO_(2)showed a negligible influence on catalytic activity but markedly inhibited carbon deposition.Further increasing the SO_(2)concentration to 500 ppm led to complete deactivation of the DFM.NO_(2)exhibited a similar concentration-dependent trend to SO_(2),albeit with a comparatively lower impact.Mechanistic analysis revealed that both SO_(2)and NO_(2)promote the formation of a coating layer of calcium-containing compounds on the surface of Ni nanoparticles,accounting for the partial or total deactivation.These findings offer critical insights into the industrial applications of ICCU systems under realistic flue gas conditions.展开更多
文摘Based on the background of ＂big-data-blowout＂, this thesis is about research on college English network teaching resources integration and utilization confronted with the chance of ＂data value, the data assets and data say＂, analyzing the inevitable challenge of ＂competition, digital divide and data privacy＂, discussing that the researchers should hold big data thinking of ＂peaks of road ＆ dances with wolves ＆ be interdependent＂, emphasizing the improvement from college English teacher＇s modem education technical information literacy[1] and putting forward to resource integration and utilization strategy in the era of big data.
基金supported by the National Natural Science Foundation(22478016,22288102).
文摘CO_(2)capture and utilization(CCU)are two important processes to address the gigaton challenges in reducing greenhouse gas emissions.Given that both processes are energy-intensive,integrating CO_(2)capture and utilization(ICCU)can improve energy efficiency and reduce economic costs by eliminating steps such as CO_(2)concentration,storage,or capture media regeneration.Aiming at building a bridge between theoretical research and practical application,this review promotes the understanding of high-temperature ICCU,mild/low-temperature ICCU,and emerging electro-/photo-driven ICCU.The reaction mechanism and technical bottleneck are comprehensively evaluated,which could provide a perspective on the design principle of dualfunctional materials(DFMs)combining synergetic adsorptive and catalytic sites.On this basis,novel strategies are proposed from the viewpoint of chemical process intensification to strive for a thermodynamics and kinetics matching between the capture and in situ conversion processes.It is expected that this review can stimulate more research in the future involving expanding the product range,fabricating long-term DFMs,developing a workable reactor,optimizing operation conditions,and establishing an industrial demonstration.
基金supported by Ministry of Science and InnovationNational Research Agency(Project PID2019-105960RBC21)+1 种基金by the Basque Government(Project IT1509-2022)One of the authors(JAOC)acknowledges the post-doctoral research grant(DOCREC20/49)provided by the University of the Basque Country。
文摘Integrated CO_(2)capture and utilization(ICCU)technology requires dual functional materials(DFMs)to carry out the process in a single reaction system.The influence of the calcination atmosphere on efficiency of 4%Ru-8%Na_(2)CO_(3)-8%CaO/γ-Al_(2)O_(3)DFM is studied.The adsorbent precursors are first co-impregnated onto alumina and calcined in air.Then,Ru precursor is impregnated and four aliquotes are subjected to different calcination protocols:static air in muffle or under different mixtures(10%H_(2)/N_(2),50%H_(2)/N_(2)and N_(2))streams.Samples are characterized by XRD,N_(2)adsorption-desorption,H_(2)chemisorption,TEM,XPS,H_(2)-TPD,H_(2)-TPR,CO_(2)-TPD and TPSR.The catalytic behavior is evaluated,in cycles of CO_(2)adsorption and hydrogenation to CH_(4),and temporal evolution of reactants and products concentrations is analyzed.The calcination atmosphere influences the physicochemical properties and,ultimately,activity of DFMs.Characterization data and catalytic performance discover the acccomodation of Ru nanoparticles disposition and basic sites is mostly influencing the catalytic activity.DFM calcined under N_(2)flow(RuNaCa-N_(2))shows the highest CH_(4)production(449μmol/g at 370℃),because a well-controlled decomposition of precursors which favors the better accomodation of adsorbent and Ru phases,maximizing the specific surface area,the Ru-basic sites interface and the participation of different basic sites in the CO_(2)methanation reaction.Thus,the calcination in a N_(2)flow is revealed as the optimal calcination protocol to achieve highly efficient DFM for integrated CO_(2)adsorption and hydrogenation applications.
基金supported by the Shanghai Municipal Science and Technology Major Project,the SPIC-SJTU Joint Research Foundation for Future Energy Plan(No.110001JX0120240074)the Science and Technology Cooperation Project of Inner Mongolia Autonomous Region and Shanghai Jiao Tong University,China.
文摘Direct air capture(DAC)is an emerging technology aimed at mitigating global warming.However,conventional DAC technologies and the subsequent utilization processes are complex and energy-intensive.An integrated system of direct air capture and utilization(IDACU)via in-situ catalytic conversion to fuels and chemicals is a promising approach,although it remains in the early stages of development.This review examines the current technical routes of IDACU,including solid-based dual-functional materials(DFMs)through thermo-catalysis,IDACU using liquid sorbents with thermo-catalysis,and non-thermal conversion methods.It covers the basic principles,reaction conditions,main products,material types,and the existing problems and challenges associated with these technical routes.Additionally,it discusses the recent advancements in solid-based DFMs for IDACU,with particular attention to the differences in material characteristics between carbon capture from flue gases(ICCU)and DAC.While IDACU technology holds significant promise,it still faces numerous challenges,especially in the design of advanced materials.
基金supported by the National Key R&D Program of China(2023YFB4104000)the Beijing Natural Science Foundation(JQ24053)+4 种基金the National Natural Science Foundation of China(52276202)the Special support program for young talent innovation teams from Zhengzhou University(32320673)the Carbon Neutrality and Energy System Transformation(CNEST)project(2023YFE0204600)the International Joint Mission On Climate Change and Carbon Neutralitythe Tsinghua University Initiative Scientific Research Program.
文摘Integrated carbon capture and utilization(ICCU)has emerged as a promising strategy toward carbon neutrality.However,most existing studies rely on simulated flue gas compositions,neglecting the impact of common impurities such as sulfur oxides(SO_(x))and nitrogen oxides(NO_(x)),thereby limiting the practical industrial applicability of ICCU technologies.Herein,we systematically investigate the effects of SO_(2)and NO_(2)at various concentrations on the adsorption-catalysis performance based on a representative Ni-Ca dual functional material(DFM)in the ICCU-dry reforming of methane(ICCU-DRM)process.Exposure to 100 ppm SO_(2)showed a negligible influence on catalytic activity but markedly inhibited carbon deposition.Further increasing the SO_(2)concentration to 500 ppm led to complete deactivation of the DFM.NO_(2)exhibited a similar concentration-dependent trend to SO_(2),albeit with a comparatively lower impact.Mechanistic analysis revealed that both SO_(2)and NO_(2)promote the formation of a coating layer of calcium-containing compounds on the surface of Ni nanoparticles,accounting for the partial or total deactivation.These findings offer critical insights into the industrial applications of ICCU systems under realistic flue gas conditions.
