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Journal of Environmental Sciences 2004年第2期16卷 316-320页

作者： HAOZheng-ping HUChun JIANGZheng G.Q.LU ResearchCenterforEeo-EnvironmentalSciences ChineseAcademyofSciencesBeijing100085China. DepartmentofChemicalEngineering UniversityofQueenslandSt.LuciaQLD4072Australia

ZrO 2-Al 2O 3 composite oxides and supported Ni catalysts were prepared, and characterized by N 2 adsorption /desorption, X-ray diffraction(XRD) an d X-ray photoelectron spectroscopy(XPS) techniques. The catalytic performance and carbon deposition was also investigated. This mesoporous composite oxide is shown to be a promising catalyst support. An increase in the catalytic activity and stability of methane and carbon dioxide reforming reaction was resulted from the zirconia addition, especially at 5wt% ZrO 2 content. The Ni catalyst supported ZrO 2-Al 2O 3 has a strong resistance to sintering and the carbon deposition in a relatively long-term reaction.

关键词： oxides catalytic properties methane reforming carbon deposition

A PVTC system integrating photon-enhanced thermionic emission and methane reforming for efficient solar power generation

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Science Bulletin 2017年第20期62卷 1380-1387页

作者： Wenjia Li Hongsheng Wang Yong Hao Institute of Engineering Thermophysics Chinese Academy of Sciences Beijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China School of Power and Mechanical Engineering Wuhan University Wuhan 430072 China

A new photovoltaic-thermochemical(PVTC) conceptual system integrating photon-enhanced thermionic emission(PETE) and methane steam reforming is proposed. Major novelty of the system lies in its potential adaptivity to primary fuels(e.g. methane) and high efficiencies of photovoltaic and thermochemical power generation, both of which result from its operation at much elevated temperatures(700–1000 °C)compared with conventional photovoltaic-thermal(PVT) systems. Analysis shows that an overall power generation efficiency of 45.3% and a net solar-to-electric efficiency of 39.1% could be reached at an operating temperature of 750 °C, after considering major losses during solar energy capture and conversion processes. The system is also featured by high solar share(37%) in the total power output, as well as high energy storage capability and very low CO_2 emissions, both enabled by the integration of methane reforming with photovoltaic generation at high temperatures.

关键词： Solar PVT Photon enhanced thermionic emission methane reforming Hybrid generation Energy storage Low-carbon utilization

NiO-CaO materials as promising catalysts for hydrogen production through carbon dioxide capture and subsequent dry methane reforming

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Journal of Energy Chemistry 2017年第5期26卷 942-947页

作者： Alejandra Cruz-Hernández J.Arturo Mendoza-Nieto Heriberto Pfeiffer Laboratorio de Fisicoquímica y Reactividad de Superficies(LaFReS) Instituto de Investigaciones en MaterialesUniversidad Nacional Autónoma de MéxicoCircuito exterior s/nCiudad UniversitariaDel.CoyoacánCP 04510Ciudad de MéxicoMexico

In this work, CaO-NiO mixed oxide powders were evaluated as consecutive CO;chemisorbents and catalytic materials for hydrogen production thought the CH;reforming process. Between the NiO impregnated CaO and CaO-NiO mechanical composite, the first one presented better chemical behaviors during the CO;capture and CH;reforming processes, obtaining syngas（H;+ CO） as final product. Results showed that syngas was produced at two different temperature ranges, between 400 and 600 °C and at T > 800 °C, where the first temperature range corresponds to the CH;reforming process but the second temperature range was attributed to a different catalytic reaction process: CH;partial oxidation. These results were confirmed through different isothermal and cyclic experiments as well as by XRD analysis of the final catalytic products, where the nickel reduction was evidenced. Moreover, when a CO-O;flow was used during the carbonation process a triple process was achieved:（i） CO oxidation,（ii） CO;chemisorption and（iii） CH;reforming. Using this gas flow the hydrogen production was always higher than that obtained with CO;.

关键词： methane reforming CO2 capture Calcium oxide H2 production NiO supported

First principles study on methane reforming over Ni/TiO2（110） surface in solid oxide fuel cells under dry and wet atmospheres

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Science China Materials 2020年第3期63卷 364-374页

作者： Wenqiang Yang Zhenbin Wang Wenzhou Tan Ranran Peng Xiaojun Wu Yalin Lu CAS Key Laboratory of Materials for Energy Conversion Department of Materials Science and EngineeringUniversity of Science and Technology of ChinaHefei 230026China Hefei National Laboratory of Physical Science at the Microscale University of Science and Technology of ChinaHefei 230026China Synergetic Innovation Center of Quantum Information&Quantum Physics University of Science and Technology of ChinaHefei 230026China

Understanding the carbon-tolerant mechanisms from a microscopic view is of special importance to develop proper anodes for solid oxide fuel *** this work,we employed density-functional theory calculations to study the CH4 reaction mechanism over a Ni/TiO2 nanostructure,which experimentally demonstrated good carbon *** potential pathways for methane reforming reactions were studied over the Ni/TiO2(110)surface under both dry and wet atmospheres,and the main concerns were focused on the impact of TiO2 and Ni/TiO2 interface on CO/H2 *** calculations suggest that the reaction between carbon and the interfacial lattice oxygen to form CO*is the dominant pathway for CH4 reforming under both dry and wet atmospheres,and intervention of steam directly to oxidize C*with its dissociated OH*group is less favorable in energy than that to wipe off oxygen vacancy to get ready for next C**** all investigated paths,desorption of CO*is one of the most difficult ***,CO*desorption can be greatly promoted by the large heat released from the previous CO*formation process under wet atmosphere.H2O adsorption and dissociation over the TiO2 surface are found to be much easier than those over Ni,yttria stabilized zirconia(YSZ)and CeO2,which should be the key reason for the greatly depressed carbon deposition over Ni-TiO2 particles than traditional YSZ-Ni and CeO2-Ni *** study presents the detailed CO*formation mechanism in CH4 reforming process over the Ni/TiO2 surface,which will benefit future research for exploring new carbon-tolerant solid oxide fuel cell anodes.

关键词： solid oxide fuel cells carbon tolerance methane reforming first principles

Experimental evaluation of a 10-kW parabolic trough solar reactor prototype driving Ni-based chemical looping redox cycle with methane for solar fuel production

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Science China Technological Sciences 2024年第12期67卷 3741-3754页

作者： JIANG QiongQiong CAO YaLi SUN Fan XING XueLi HONG Hui Key Laboratory of Power Station Energy Transfer Conversion and System of MOE School of Energy Power and Mechanical EngineeringNorth China Electric Power University State Power Investment Corporation Hydrogen Energy School of Aeronautics and Astronautics University of Chinese Academy of Sciences Institute of Engineering Thermophysics Chinese Academy of Sciences China Huaneng Group Clean Energy Association Research Institute

Solar fuels can be cost-effectively produced using solar-driven thermochemical processes. Hybridizing thermochemical processes can not only effectively utilize solar energy but also achieve clean conversion of fossil fuels. With this method, the solar energy level can be upgraded, and the irradiation fluctuation can be solved. It is worth noting that solar reactors play an important role in this technology. In this study, we demonstrated a 10-kW parabolic trough solar-driven reactor prototype for methane reforming and solar fuel production. The primary setup of the experimental platform consisted of a trough concentrating solar collector, chemical looping reforming reactors with indirect heat transfer, and associated auxiliary equipment. Experiments on the chemical looping redox cycle were conducted using nickel-based NiO/NiAl2O4as the OC under different direct normal irradiation（DNI） from 740 to 920 W/m2. Under irradiation at approximately 920 W/m2, the methane conversion initially increased to 92% before declining to 75% from 0 to 900 s and then to 2500 s. Under these conditions, the syngas concentration increased from 30% to 57% and the solar-to-fuel efficiency reached 59%. The oxygen transfer rate during the chemical looping redox cycle was also experimentally investigated. Cyclic redox cycle experiments were conducted for 540 min of long-term operation to assess the duration and adaptability performance. The fractional oxidation can consistently return to almost 1.0 after each redox cycle, indicating strong reactivity and regenerability when exposed to different levels of DNI. The reactivity of the chemical looping redox cycle during typical autumn and winter days was also investigated and discussed. This study aimed to prove that this 10-kW parabolic trough reactor prototype can harness 500°C solar heat to drive efficient methane reforming,offering a promising avenue for solar fuel production.

关键词： solar fuel solar reactor chemical looping thermochemical redox cycle methane reforming

Research progress on methane conversion coupling photocatalysis and thermocatalysis

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Carbon Energy 2021年第4期3卷 519-540页

作者： Zengzan Zhu Wenyi Guo Ying Zhang Chengsi Pan Jing Xu Yongfa Zhu Yang Lou Key Laboratory of Synthetic and Biological Colloids Ministry of EducationSchool of Chemical and Material EngineeringJiangnan UniversityWuxiJiangsuChina International Joint Research Center for Photoresponsive Molecules and Materials Jiangnan UniversityWuxiJiangsuChina School of Food Science and Technology Jiangnan UniversityWuxiJiangsuChina Department of Chemistry Tsinghua UniversityBeijingChina

Conversion of methane into value-added chemicals is of significance for methane utilization and industrial demand of primary chemical *** barrier associated with the nonpolar structure of methane and the high bond energy C-H bond(4.57 eV)makes it difficult to realize methane conversion and activation under mild *** photothermal synergetic strategy by combining photon energy and thermo energy provides an advanced philosophy to achieve efficient methane *** this review,we overview the current pioneering studies of photothermal methane indirect conversion and present the methane direct conversion by the way of photocatalysis and thermocatalysis to provide a fundamental understanding of methane ***,we end this review with a discussion on the remaining challenges and perspectives of methane direct conversion over single-atom catalysts via photothermal synergetic strategy.

关键词： methane conversion methane partial oxidation methane reforming photothermal catalysis