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Modeling the kinetics of methane conversion in steam reforming process of coke-oven gas based on experimental data

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Journal of Chongqing University 2007年第3期6卷 155-160页

作者：张家元 School of Energy Science and Engineering Central South University

steam-reforming is an effective approach for upgrading methane and hydrocarbon of coke-oven gas into CO and HE, but the kinetic behavior needs more study. We investigated the conversion of methane in coke-oven gas by steam reforming process in an electric tubular flow at 14 kPa with temperature varying from .500 ℃ to 9.50 ℃, and developed a kenetic model for, ignoring the effects of adsorption and diffusion. The optimal dynamic conditions for methane conversion 14 kPa are as follows： the ratio of the amount of water to the amount of methane is from 1.1 to 1.3; the reaction temperature is from 1 223 K to 1 273 K. The methane conversion rate is larger than 95% when the ratio of the amount of water to the amount of methane is 1.2 at a temperature above 1 223 K with the residence time up to 0.75 s.

关键词： coke oven gas steam reforming kinetics model conversion rate

Preparation of Sub-10nm Cored Ni@ZrO2 yolk-shell structured catalysts and its sintering-resistant property in steam reforming of methane

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Preparation of Sub-10nm Cored Ni@ZrO2 yolk-shell structured ...

steam effects over Pd/Ce_(0.67)Zr_(0.33)O_2 three-way catalyst

第十四届全国青年催化学术会议

作者： Zi-Yian Lim Chunzheng Wu Chen Zhou Hongfeng Yin Kwang-Leong Choy Wei Guo Wang Fuel Cells & Energy Technology Division Ningbo Institute of Material Technology and Engineering Ningbo Industrial Technology Research Institute CAS Division of Science and Engineering The University of Nottingham Ningbo China University Park

＜正＞Nickel-based catalysts have been developed as promising candidates for steam reforming of methane. However, their stability has been restricted due to agglomeration among active particles at high temperatures. In the present work, Ni/ZrO2 yolk shell nano-reactor framework has been proposed, where Ni cores are inside the hollow zirconia shells. The catalyst has been prepared

关键词： Yolk-Shell steam reforming Methane Sintering-resistant

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Journal of Rare Earths 2011年第3期29卷 217-224页

作者：王建强沈美庆王军王务林 Key Laboratory for Green Chemical Technology of State Education Ministry School of Chemical Engineering&TechnologyTianjin University China Automotive Technology&Research Center State Key Laboratory of Engines Tianjin University

In the purification process of automobile exhaust,existing water plays an important role as an oxidant,which converts CO and hydrocarbons（HCs） by the water-gas shift（WGS） and the steam reforming（SR） reactions,respectively,especially at high *** it is major component of the exhaust which can affect significantly the thermal stability of the three-way *** experiments were carried out close to the real operation conditions（GHSV,concentration,etc.） with a Pd/Ce0.67Zr0.33O2 catalyst supplying information on the CO and C3H8 oxidation reactions in feedstream formed by different reactant *** obtained results showed that the activity of the CO and C3H8 oxidation was promoted by the addition of steam due to the WGS and SR *** WGS and SR reaction were competitive under oxygen-lean *** kinetic analysis was considered for WGS and SR reactions.

关键词： three-way catalysts water-gas shift steam reforming turnover frequency compensation effect rare earths

steam effects over Pd/Ce_(0.67)Zr_(0.33)O_2-Al_2O_3 three-way catalyst

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Journal of Rare Earths 2012年第8期30卷 748-752页

作者：王建强沈美庆王军高继东马杰刘双喜 Key Laboratory for Green Chemical Technology of State Education Ministry School of Chemical Engineering&TechnologyTianjin University China Automotive Technology&Research Center

Ceria-zirconia-alumina （CZA） solid solution was prepared by sol-gel method in the present study. 0.5 wt.% Pd supported on CZA was prepared by incipient wetness impregnation. The steam effects for CO and C3H8 oxidation, three-way catalytic activity and stoichiometric window property were studied. The light-off temperature of the CO oxidation reaction shifted to a lower temperature due to the water-gas shift （WGS） reactions. The oxidation of C3H8 was enhanced due to the steam reforming （SR） reactions. The steam promoted the C3H8 oxidation and NO reduction in three-way catalytic reaction. The amplitude of stoichiometric window was amplified by the addition of water to the feed stream.

关键词： Pd/Ce0.67Zr0.33O2-Al2O3 three-way catalytic activity water-gas shift steam reforming stoichiometric window rare earths

Effect of cobalt doping on ceria-zirconia mixed oxide: Structural characteristics, oxygen storage/release capacity and three-way catalytic performance

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Journal of Rare Earths 2012年第9期30卷 878-883页

The effect of Co doping on ceria-zirconia mixed oxides was investigated for Co0.1Ce0.6Zr0.3Ox sample prepared by sol-gel method. The Pd-only three-way catalyst （TWC） was obtained by incipient wetness impregnation with 0.5 wt.% Pd loading. The structural and oxygen handling properties were analyzed by X-ray diffraction （XRD）, H2-temperature programmed reduction （H2-TPR） and the dynamic oxygen storage capacity （DOSC）. The introduction of Co into ceria-zirconia lattice strongly modified the mobility of oxygen and enhanced the DOSC performance. Pd-only TWC based on the Co0.1Ce0.6Zr0.3Ox support exhibited superior activity for water-gas shift and steam reforming and ampli- fied amplitude of stoichiometric window.

关键词： three-way catalyst stoichiometric window dynamic oxygen storage capacity water-gas shift steam reforming Co doping rare earths

Solid oxide fuel cells in combination with biomass gasification for electric power generation

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Chinese Journal of Chemical Engineering 2020年第4期28卷 1156-1161页

作者： Huangang Shi Qianjun Li Wenyi Tan Hao Qiu Chao Su School of Environmental Engineering Nanjing Institute of TechnologyNanjing 211167PR China School of Energy and Power Engineering Jiangsu University of Science and TechnologyZhenjiang 212003PR China WA School of Mines MineralsEnergy and Chemical Engineering(WASM-MECE)Curtin UniversityGPO Box U1987PerthWA 6845Australia

Biomass,a source of renewable energy,represents an effective substitute to fossil *** is a process that organics are thermochemically converted into valuable gaseous products(***).In this work,the catalytic test demonstrated that the biogas produced from biomass gasification mainly consists of H2,CH4,CO,and CO2,which were then be used as the fuel for solid oxide fuel cell(SOFC).Planar SOFCs were fabricated and *** steam reforming of biogas was carried out at the anode of a SOFC to obtain a hydrogen-rich *** performance of the SOFCs operating on generated biogas was investigated by I-V polarization and electrochemical impedance spectra *** excellent cell performance was obtained,for example,the peak power density of the SOFC reached 1391 mW·cm-2 at 750℃when the generated biogas was used as the ***,the SOFC fuelled by simulated biogas delivered a very stable operation.

关键词： Biomass gasification Biogas Solid oxide fuel cell steam reforming

Dimethyl ether as circular hydrogen carrier:Catalytic aspects of hydrogenation/dehydrogenation steps

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Journal of Energy Chemistry 2021年第7期30卷 55-77页

作者： Enrico Catizzone Cesare Freda Giacobbe Braccio Francesco Frusteri Giuseppe Bonura ENEA–Italian Agency for New Technologies Department of Energetic TechnologiesLaboratory of Thermochemical Processes for Waste and Biomass ValorisationRotondellaItaly CNR-ITAE–Consiglio Nazionale delle Ricerche Istituto di Tecnologie Avanzate per l’Energia‘‘Nicola Giordano”Via S.Lucia Sopra Contesse 5I-98126 MessinaItaly

The intermittent nature of renewable resources requires for most applications the development of efficient and cost-effective technologies for steady supply of electrical *** storage of energy in the form of hydrogen chemically bound within organic molecules(rather than physically as compressed gas or cooled liquid)represents an alternative approach that is attracting great research *** to other liquid organic hydrogen carriers(LOHCs),dimethyl ether(DME)appears to have the largest potential impact on society,especially if inserted in technological chains of CO_(2) sequestration and utilization,so to determine an effective mitigation of environmental issues,without any net effect on the carbon ***,the steps of H2 storage and H2 release can take place in two coupled chemical processes,constituted by the exothermic synthesis of DME via CO_(2) hydrogenation and the endothermic steam reforming of DME,***,the latest advances in the development of heterogeneous bifunctional and hybrid catalysts for the direct hydrogenation of CO_(2) to DME are thoroughly reviewed,with special emphasis on thermodynamics,catalyst design and process *** many aspects behind the mechanism of DME synthesis from H2-CO_(2) streams are still to be uncovered,the recent progress in the research on H2 release by DME steam reforming is increasing the interest for effectively closing this binary H2 loop,in view of future green deals and sustainable research developments.

关键词： DME CO_(2)hydrogenation steam reforming Hybrid catalysts Hydrogen carrier

Natural gas and biofuel as feedstock for hydrogen productionon Ni catalysts

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Journal of Natural Gas Chemistry 2009年第1期18卷 9-14页

作者： Pasquale Corbo Fortunato Migliardini Istituto Motori CNR Via Marconi 8-80125 Napoli Italy

In this article, the aptitude of natural gas as feedstock in steam reforming process for hydrogen production is compared with that of different liquid fuels （pure compounds and commercial fuels）, with the aim to investigate the potentialities of biofuels to overcome the CO2 emission problems deriving from fossil fuel processing. The performances of a nickel based catalyst （commercially used in steam reforming of natural gas） were evaluated in terms of feed conversion and yield to the different products as function of temperature, space velocity and water/fuel ratio. Furthermore, a preliminary evaluation of catalyst durability was effected by monitoring yield to H2 versus time on stream and measuring coke formation at the end of experimental tests. High yields to hydrogen were obtained with all fuels investigated, whereas the deactivation phenomena, which are correlated to carbon deposition on the catalyst, were observed with all tested fuels, except for methane and biofuel.

关键词： natural gas hydrogen steam reforming biofuels

Modeling of high-temperature reforming reactor based on interactive thermal control with a tail gas combustor

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Advances in Manufacturing 2016年第1期4卷 47-54页

作者： Dan Zhang Zhong Shao Ji-Ping Xin Ai-Jun Li Shanghai Key Laboratory of Mechanics in EnergyEngineering Institute of Applied Mathematics andMechanics Shanghai University Shanghai 200444People's Republic of China Research Center of Composite Materials ShanghaiUniversity Shanghai 200444 People's Republic of China

This paper proposes a method to model hydrocarbon reforming by coupling detailed chemical kinetics with complex computational fluid dynamics. The entire chemistry of catalyzed reactions was confined within the geometrically simple channels and modeled using the low-dimensional plug model, into which the interactive thermal control of the multi-channel reforming reactor has been implemented with a tail-gas combustor around the external surface of these catalytic channels. The geomet- rically complex flow in the tail gas combustor was simu- lated using FLUENT without involving any chemical reactions. The influences of the conditions at the reactor inlet such as the inlet gas velocity, the inlet gas composi- tion and the variety of hydrocarbons of each channel on gas conversions were investigated numerically. The impact of the tail gas combustor setup on the efficiency of the reforming reactor was also analyzed. Methane catalytic partial oxidation （CPOx） and propane steam reforming （SR） were used to illustrate the approach reported in the present work.

关键词： Computational fluid dynamics Reactionkinetics Catalytic partial oxidation steam reforming