Coking-resistant Ni-ZrO2/Al2O3 catalyst for CO methanation

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	Coking-resistant Ni-ZrO2/Al2O3 catalyst for CO methanation
	Liu, Qing; Gu, Fangna; Gao, Jiajian; Li, Huifang; Xu, Guangwen; Su, Fabing
刊名	JOURNAL OF ENERGY CHEMISTRY
	2014-11-01
卷号	23 期号:6 页码:761-770
关键词	Ni/gamma-Al2O3 ZrO2 coke resistance syngas methanation
ISSN号	2095-4956
其他题名	J. Energy Chem.
中文摘要	Highly coke-resisting ZrO2-decorated Ni/Al2O3 catalysts for CO methanation were prepared by a two-step process. The support was first loaded with NiO by impregnating method and then modified with ZrO2 by deposition-precipitation method (IM-DP). Nitrogen adsorption-desorption, X-ray diffraction, scanning electron microscopy, transmission electron microscopy, thermogravimetric analysis, H-2 temperature-programmed reduction and desorption, NH3 temperature-programmed desorption, and zeta potential analysis were employed to characterize the samples. The results revealed that, compared with the catalysts with the same composition prepared by co-impregnation (CI) and sequential impregnation (SI) methods, the Ni/Al2O3 catalyst prepared by IM-DP showed much enhanced catalytic performance for syngas methanation under the condition of atmospheric pressure and a high weight hourly space velocity of 120000 mL.g(-1).h(-1). In a 80 h life time test under the condition of 300-600 degrees C and 3.0 MPa, this catalyst showed high stability and resistance to coking, and the amount of deposited carbon was only 0.4 wt%. On the contrary, the deposited carbon over the catalyst without ZrO2 reached 1.5 wt% after a 60 h life time test. The improved catalytic performance was attributed to the selective deposition of ZrO2 nanoparticles on the surface of NiO rather than Al2O3, which could be well controlled via changing the electrostatic interaction in the DP procedure. This unique structure could enhance the dissociation of CO2 and generate surface oxygen intermediates, thus preventing carbon deposition on the Ni particles in syngas methanation.
英文摘要	Highly coke-resisting ZrO2-decorated Ni/Al2O3 catalysts for CO methanation were prepared by a two-step process. The support was first loaded with NiO by impregnating method and then modified with ZrO2 by deposition-precipitation method (IM-DP). Nitrogen adsorption-desorption, X-ray diffraction, scanning electron microscopy, transmission electron microscopy, thermogravimetric analysis, H-2 temperature-programmed reduction and desorption, NH3 temperature-programmed desorption, and zeta potential analysis were employed to characterize the samples. The results revealed that, compared with the catalysts with the same composition prepared by co-impregnation (CI) and sequential impregnation (SI) methods, the Ni/Al2O3 catalyst prepared by IM-DP showed much enhanced catalytic performance for syngas methanation under the condition of atmospheric pressure and a high weight hourly space velocity of 120000 mL.g(-1).h(-1). In a 80 h life time test under the condition of 300-600 degrees C and 3.0 MPa, this catalyst showed high stability and resistance to coking, and the amount of deposited carbon was only 0.4 wt%. On the contrary, the deposited carbon over the catalyst without ZrO2 reached 1.5 wt% after a 60 h life time test. The improved catalytic performance was attributed to the selective deposition of ZrO2 nanoparticles on the surface of NiO rather than Al2O3, which could be well controlled via changing the electrostatic interaction in the DP procedure. This unique structure could enhance the dissociation of CO2 and generate surface oxygen intermediates, thus preventing carbon deposition on the Ni particles in syngas methanation.
WOS标题词	Science & Technology ; Physical Sciences ; Technology
类目[WOS]	Chemistry, Applied ; Chemistry, Physical ; Energy & Fuels ; Engineering, Chemical
研究领域[WOS]	Chemistry ; Energy & Fuels ; Engineering
关键词[WOS]	SYNTHETIC NATURAL-GAS ; NI/AL2O3 CATALYSTS ; FLUIDIZED-BED ; SYNGAS METHANATION ; NI/ZRO2 CATALYST ; OVEN GAS ; ZRO2 ; PERFORMANCE ; NI-AL2O3 ; SUPPORTS
收录类别	SCI
原文出处	://WOS:000346331100012
语种	英语
WOS记录号	WOS:000346331100012
公开日期	2015-04-01
内容类型	期刊论文
源URL	[http://ir.ipe.ac.cn/handle/122111/11793]
专题	过程工程研究所_研究所（批量导入）
作者单位	Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Liu, Qing,Gu, Fangna,Gao, Jiajian,et al. Coking-resistant Ni-ZrO2/Al2O3 catalyst for CO methanation[J]. JOURNAL OF ENERGY CHEMISTRY,2014,23(6):761-770.
APA	Liu, Qing,Gu, Fangna,Gao, Jiajian,Li, Huifang,Xu, Guangwen,&Su, Fabing.(2014).Coking-resistant Ni-ZrO2/Al2O3 catalyst for CO methanation.JOURNAL OF ENERGY CHEMISTRY,23(6),761-770.
MLA	Liu, Qing,et al."Coking-resistant Ni-ZrO2/Al2O3 catalyst for CO methanation".JOURNAL OF ENERGY CHEMISTRY 23.6(2014):761-770.