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Performance of a tubular oxygen-permeable membrane reactor for partial oxidation of CH_4 in coke oven gas to syngas

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Journal of Natural Gas Chemistry 2010年第3期19卷 280-283页

作者： Yuwen Zhang Hongwei Cheng Jiao Liu weizhong ding Shanghai Key Laboratory of Modern Metallurgy ＆ Materials Processing Shanghai University Shanghai 200072 China

A gas-tight BaCo 0.7 Fe 0.2 Nb 0.1 O 3-δ（BCFNO） tubular membrane was fabricated by hot pressure *** a membrane reactor with BCFNO tubular membrane and Ag-based sealant was readily constructed and applied to partial oxidation of CH4 in coke oven *** 875 ℃,95% of methane conversion,91% of H 2 and as high as 10 ml cm-2·min-1 of oxygen permeation flux were *** was a good match in the coefficient of thermal expansion between Ag-based alloy and BCFNO membrane *** tubular BCFNO membrane reactor packed with Ni-based catalysts exhibited not only high activity but also good stability in hydrogen-enriched coke oven gas（COG） atmosphere.

关键词： tubular oxygen-permeable membrane reactor partial oxidation coke oven gas hydrogen production

Hydrogen production from simulated hot coke oven gas by catalytic reforming over Ni/Mg(Al)O catalysts

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Journal of Natural Gas Chemistry 2009年第2期18卷 225-231页

作者： Hongwei Cheng Baohua Yue XueguangWang Xionggang Lu weizhong ding Shanghai Key Laboratory of Modern Metallurgy and Materials Processing Shanghai University Shanghai 200072 China Department of Chemistry Shanghai University Shanghai 200072 China

Hydrogen production by catalytic reforming of simulated hot coke oven gas （HCOG） with toluene as a model tar compound was investigated in a fixed bed reactor over Ni/Mg（Al）O catalysts. The catalysts were prepared by a homogeneous precipitation method using urea hydrolysis and characterized by ICE BET, XRD, TPR, TEM and TG. XRD showed that the hydrotalcite type precursor after calcination formed （Ni, Mg）Al2O4 spinel and Ni-Mg-O solid solution structure. TPR results suggested that the increase in Ni/Mg molar ratio gave rise to the decrease in the reduction temperature of Ni^2＋ to Ni^0 on Ni/Mg（Al）O catalysts. The reaction results indicated that toluene and CH4 could completely be converted to H2 and CO in the catalytic reforming of the simulated HCOG under atmospheric pressure and the amount of H2 in the reaction effluent gas was about 4 times more than that in original HCOG. The catalysts with lower Ni/Mg molar ratio showed better catalytic activity and resistance to coking, which may become promising catalysts in the catalytic reforming of HCOG.

关键词： hydrogen production coke oven gas tar toluene hydrotalcite

Evaluation of Component Activities in C-Mn-Fe-Si with Model Self-SReM4

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Journal of Iron and Steel Research International 1998年第1期5卷 28-33页

作者： Zhang Xiaobing Jiang Guochang ding weizhong Xu Kuangdi Shanghai Enhanced Lab of Ferrometallurgy Shanghai University

A sub-regular solution model SELFSReM4 used to evaluate activities of the components in a homogeneous region of a quaternary system has been developed in Shanghai Enhanced Lab of Ferrometallurgy. This paper introduces the application of SELFSReM4 in evaluating activities of the components in C-Mn-Fe-Si system without SiC precipitation.

关键词： sub-regular solution model component activity C-Mn-Si-Fe alloy

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Perovskite-type oxygen-permeable membrane BaCo_(0.7)Fe_(0.2)Nb_(0.1)O_(3-δ) for partial oxidation of methane in coke oven gas to hydrogen

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Rare Metals 2010年第3期29卷 231-237页

作者： ZHANG Yuwen LIU Jiao LIU Yong ding weizhong LU Xionggang Shanghai Key Laboratory of Modern Metallurgy ＆ Materials Processing Shanghai University Shanghai 200072 China

Perovskite-type oxygen-permeable membrane reactors of BaCo0.7Fe0.2Nb0.1O3-δ （BCFNO） packed with Ru-based catalyst had high oxygen permeability and could be used for hydrogen production by partial oxidation of methane in coke oven gas （COG）. At 1173 K, 94% of methane conversion, 85% of H2 selectivity, 107% of CO selectivity, and as high as 15.4 mL·cm^-2·min^-1 of oxygen permeation flux were obtained. The BCFNO membrane itself had poor catalytic activity to partial oxidation of CH4 in COG. During continuous operation for 70 h at 1173 K, no degradation of the membrane reaction performance was observed. XRD and SEM characterization also demonstrated that the BCFNO membrane reactor exhibited good stability in partial oxidation of methane in COG.

关键词： hydrogen production coke oven gas methane conversion oxygen permeation oxygen-permeable membrane

Effect of CeO_2 addition on Ni/Al_2O_3 catalysts for methanation of carbon dioxide with hydrogen

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Journal of Natural Gas Chemistry 2012年第6期21卷 703-707页

作者： Hezhi Liu Xiujing Zou Xueguang Wang Xionggang Lu weizhong ding Shanghai Key Laboratory of Modern Metallurgy and Material Processing Shanghai UniversityShanghai 200072China

The Ni-CeO2/Al2O3 catalysts with a nickel content of 15 wt% prepared via impregnating boehmite were found to be highly active and stable for methanation of carbon dioxide with hydrogen at a H2/CO2 molar ratio of 4. The effects of CeO2 content and reaction temperature on the performance of the Ni-CeO2/Al2O3 catalysts were studied in detail. The results showed that the catalytic performance was strongly dependent on the CeO2 content in Ni-CeO2/Al2O3 catalysts and that the catalysts with 2 wt% CeO2 had the highest catalytic activity among the tested ones at 350 ℃. The XRD and H2-TPR characterizations revealed that the addition of CeO2 decreased the reduction temperature by altering the interaction between Ni and Al2O3, and improved the reducibility of the catalyst. Preliminary stability test of 120 h on stream over the Ni-2CeO2/Al2O3 catalyst at 350 ℃ revealed that the catalyst was much better than the unpromoted one.

关键词： carbon dioxide methanation ceria alumina nickel catalyst

Partial oxidation of simulated hot coke oven gas to syngas over Ru-Ni/Mg(Al)O catalyst in a ceramic membrane reactor

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Journal of Natural Gas Chemistry 2009年第4期18卷 467-473页

作者： Hongwei Cheng Xionggang Lu Xu Liu Yuwen Zhang weizhong ding Shanghai Key Laboratory of Modern Metallurgy and Materials Processing Shanghai University Shanghai 200072 China

Hydrogen amplification from simulated hot coke oven gas （HCOG） was investigated in a BaCo0.7Fe0.2Nb0.1O3-δ （BCFNO） membrane reactor combined with a Ru-Ni/Mg（Al）O catalyst by the partial oxidation of hydrocarbon compounds under atmospheric pressure. Under optimized reaction conditions, the dense oxygen permeable membrane had an oxygen permeation flux around 13.3 ml/（cm^2·min）. By reforming of the toluene and methane, the amount of H2 in the reaction effluent gas was about 2 times more than that of original H2 in simulated HCOG. The Rn-Ni/Mg（Al）O catalyst used in the membrane reactor possessed good catalytic activity and resistance to coking. After the activity test, a small amount of whisker carbon was observed on the used catalyst, and most of them could be removed in the hydrogen-rich atmosphere, implying that the carbon deposition formed on the catalyst might be a reversible process.

关键词： hydrogen production coke oven gas tar toluene hydrotalcite mixed-conducting oxygen-permeable membrane reactor

Carbon dioxide reforming of methane over mesoporous nickel aluminate/γ-alumina composites

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Journal of Energy Chemistry 2017年第1期26卷 93-100页

作者： Li Zhang Xueguang Wang Xingfu Shang Mingwu Tan weizhong ding Xionggang Lu State Key Laboratory of Advanced Special Steel Shanghai UniversityShanghai 200072China Shanghai Key Laboratory of Advanced Ferrometallurgy School of Materials Science and EngineeringShanghai UniversityShanghai 200072China

A series of xNiAl2O4/γ-Al2O3composites with various Ni contents have been prepared via one-step partial hydrolysis of metal nitrate salts in the absence of surfactants and used for carbon dioxide reforming of methane. The characterization results demonstrated that the NiAl2O4/γ-Al2O3materials possessed mesoporous structures of uniform pore sizes; and the Ni2+ions were completely reacted with alumina to NiAl2O4spinel in the matrices using N2sorption, XRD, TEM, and XPS. The NiAl2O4/γ-Al2O3materials exhibited excellent catalytic properties and superior long-term stability for carbon dioxide reforming of methane. The effects of Ni content on the intrinsic activities and the amounts of coke disposition of the xNiAl2O4/γ-Al2O3catalysts were discussed in detail for the carbon dioxide reforming of methane. The results revealed that the Ni particle sizes did not affect the intrinsic activity of metallic Ni, but smaller Ni particles could reduce the rate of coke deposition. © 2016 Science Press

关键词： Alumina Carbon dioxide Characterization Coke Mesoporous materials Methane Nickel Pore size Synthesis gas manufacture

SrCo_(0.7)Fe_(0.2)Nb_(0.1)O_(3-δ) perovskite stabilized by niobium for oxygen permeation

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Rare Metals 2012年第4期31卷 392-396页

作者： Wang, Haihai Zhang, Yuwen Geng, Zhen Zhang, Qifei Gai, Yongqian ding, weizhong Shanghai Key Laboratory of Modern Metallurgy and Materials Processing Shanghai UniversityShanghai 200072China

The effect of Nb doping on the oxygen permeation and stability of SrCo_(0.8)Fe_(0.2)O_(3-δ)(SCFO) was investigated *** perovskite phase was formed in SrCo_(0.7)Fe_(0.2)Nb_(0.1)O_(3-δ)(SCFNO).The SCFNO with a thickness of 1 mm had a high level of oxygen permeation flux of 1.4 ***^(-1).cm^(-2) at 850 ℃ under air/He *** bulk diffusion is the rate-limiting step in overall oxygen permeation mechanism for SCFNO when the thickness is higher than 1.0 *** partial substitution of Nb for Co suppresses the transition of oxygen vacancies order/disorder proven by DSC measurement and enhances the phase stability under low oxygen partial *** long-term tests under low oxygen pressure,the SCFNO exhibites structural stability and stable oxygen *** is proved that substitution of Nb for Co is an effective way to improve the properties of SCFO.

关键词： SrCo_(0.7)Fe_(0.2)Nb_(0.1)O_(3-δ)(SCFNO) oxygen permeability structural stability

Total conductivity,oxygen permeability and stability of perovskite-type oxide BaCo_(0.7)Fe_(0.2)Nb_(0.1)O_(3-δ)

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Rare Metals 2009年第2期28卷 202-208页

作者： Zhang, Yuwen Liu, Yong Wang, Chenglei Yang, Zhibin ding, weizhong Lu, Xionggang Shanghai Key Laboratory of Modern Metallurgy and Materials Processing Shanghai University Shanghai 200072 China

The total conductivity,oxygen sorption property,oxygen permeability and stability of pure perovskite-type oxide BaCo0.7Fe0.2Nb0.1O3-δ (BCFNO) in real operating conditions were investigated. Its total conductivity was measured to be 3.6 S·cm-1 at 600°C. Though the total conductivity of the BCFNO membrane is much smaller than that of the Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCFO) membrane,the oxygen permeability of the BCFNO membrane is similar to that of the BSCFO membrane. SEM observation and EDX analysis of the BCFN...

关键词： perovskite-type oxide total conductivity oxygen permeability stability