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Application of CoFe_(2)O_(4)-NiO nanoparticle-coated foam-structured material in a high-flux solar thermochemical reactor

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Science China(Technological Sciences) 2023年第11期66卷 3276-3286页

作者： ZHANG Hao ZHANG XiaoMi YANG DaZhi SHUAI Yong GUENE LOUGOU Bachirou PAN QingHui WANG FuQiang School of Electrical Engineering and Automation Harbin Institute of TechnologyHarbin 150001China School of Energy Science and Engineering Harbin Institute of TechnologyHarbin 150001China School of New Energy Harbin Institute of Technology at WeihaiWeihai 264209China

The splitting of carbon dioxide through the two-step solar thermochemical cycle presents enormous potential,for it holds the dual functionalities of solar fuel production and carbon-based energy ***,the industrialization of this technology is impeded by two critical factors:The absence of fully developed oxygen carriers and advanced reaction devices that deliver exceptional *** order to identify a potentially effective oxygen carrier,50 wt%NiO-modified Co Fe_(2)O_(4)is selected as the active component and characterized by means of thermogravimetry,scanning electron microscopy,and energy dispersive spectroscopy,so as to clarify its oxygen exchange capacity,micromorphology and elemental composition in high-temperature thermochemical ***,nanoparticle-coated foam-structured materials are prepared in combination with Si C ceramic foam for experimental testing in a high-flux solar *** results indicate that a peak CO yield of 1.96 m L min^(-1)g^(-1)can be gained in a 1500–1250 K preliminary test,demonstrating the application potential of the *** contrast to conventional redox materials,the CO_(2)activity of the materials synthesized in this study exhibits an enhancement with rising oxidation *** means that isothermal cycles can potentially achieve higher conversion and fuel yield than non-isothermal cycles,while simultaneously reducing the amount of irreversible heat loss during high-temperature *** the estimated steadystate thermal efficiency of the solar reactor can reach up to 42%,further optimization of the reactor design is necessary to enhance energy conversion efficiency,as it is partially limited by the dimensions of the reaction chamber.

关键词： solar thermochemistry CO_(2)splitting two-step redox cycle iron-base oxygen carrier reactor design

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Cyclohexane Dehydrogenation in solar-Driven Hydrogen Permeation Membrane Reactor for Efficient solar Energy Conversion and Storage

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Journal of Thermal Science 2021年第5期30卷 1548-1558页

作者： WANG Xiaochuan WANG Bingzheng WANG Man LIU Qingjun WANG Hongsheng MOE Key Laboratory of Hydrodynamic Machinery Transients Ministry of EducationSchool of Power and Mechanical EngineeringWuhan UniversityHubei 430072China Department of Chemical System Engineering School of EngineeringThe University of TokyoTokyo 113-8656Japan China Pingmei Shenma Energy and Chemical Group Corporation Limited Henan 476000China

Cyclohexane dehydrogenation in the solar-driven membrane reactor is a promising method of directly producing pure hydrogen and benzene from cyclohexane and storing low-grade solar energy as high-grade chemical *** this paper,partial pressure of gases,conversion rate of cyclohexane,and energy efficiency of the reactor are analyzed based on numerical *** process of cyclohexane dehydrogenation under four temperatures(200℃,250℃,300℃,and 350℃)and four permeate pressures(0.050 MPa,0.025 MPa,0.010 MPa,and 0.001 MPa)were studied.A complete conversion rate(99.9%)of cyclohexane was obtained as the reaction equilibrium shifts forward with hydrogen *** first-law thermodynamic efficiency,solar-to-fuel efficiency,and exergy efficiency could reach as high as 94.69%,46.93%and 93.08%,*** study indicates that it is feasible to combine solar energy supply technology with cyclohexane dehydrogenation reaction integrated with membrane reactor.

关键词： cyclohexane dehydrogenation solar energy utilization membrane reactor kinetic and thermodynamic analysis hydrogen generation solar thermochemistry

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