Highly active and stable Ni/gamma-Al2O3 catalysts selectively deposited with CeO2 for CO methanation dagger

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	Highly active and stable Ni/gamma-Al2O3 catalysts selectively deposited with CeO2 for CO methanation dagger
	Liu, Qing 1; Gao, Jiajian 1; Zhang, Meiju 1; Li, Huifang 1; Gu, Fangna 1; Xu, Guangwen 1; Zhong, Ziyi 2; Su, Fabing 1
刊名	RSC ADVANCES
	2014
卷号	4 期号:31 页码:16094-16103
关键词	SYNTHETIC NATURAL-GAS ATOMIC LAYER DEPOSITION NI/AL2O3 CATALYSTS CARBON-DIOXIDE SYNGAS METHANATION OXIDATION OXIDE DEACTIVATION HYDROGEN PERFORMANCE
ISSN号	2046-2069
其他题名	RSC Adv.
中文摘要	We report the preparation of highly active, coking-and sintering-resistant CeO2-decorated Ni/gamma-Al2O3 catalysts by an impregnation method followed by a modified deposition-precipitation (DP) of CeO2. The samples were characterized by nitrogen adsorption, X-ray diffraction, scanning electron microscopy, transmission electron microscopy, thermogravimetric analysis, H-2 temperature-programmed reduction, H2 temperature-programmed desorption and zeta potential analysis. The results revealed that compared with the Ni catalysts with a NiO loading of 40 wt% prepared by co-impregnation (CI) and sequential impregnation (SI) methods, the Ni catalyst synthesized by DP method showed enhanced catalytic performance for CO methanation at atmospheric pressure and an extremely high weight hourly space velocity (WHSV) of 240 000 mL g(-)1 h(-1). In a 50 h high-pressure life-test, this catalyst showed a high resistance to both coking and sintering. It was found that CeO2 nanoparticles were selectively deposited on the surface of NiO rather than on Al2O3 due to the electrostatic interaction during the DP process, effectively preventing Ni particles from sintering during the reduction and reaction at high temperatures, and inhibiting coke formation by increasing the supply of active oxygen species on the nickel surface. As a result, the formed CeO2-decorated Ni/Al2O3 catalyst exhibited excellent catalytic performance and stability in CO methanation. This work demonstrated that catalytic properties could be much improved for a usual catalyst with a well-designed structure.
英文摘要	We report the preparation of highly active, coking-and sintering-resistant CeO2-decorated Ni/gamma-Al2O3 catalysts by an impregnation method followed by a modified deposition-precipitation (DP) of CeO2. The samples were characterized by nitrogen adsorption, X-ray diffraction, scanning electron microscopy, transmission electron microscopy, thermogravimetric analysis, H-2 temperature-programmed reduction, H2 temperature-programmed desorption and zeta potential analysis. The results revealed that compared with the Ni catalysts with a NiO loading of 40 wt% prepared by co-impregnation (CI) and sequential impregnation (SI) methods, the Ni catalyst synthesized by DP method showed enhanced catalytic performance for CO methanation at atmospheric pressure and an extremely high weight hourly space velocity (WHSV) of 240 000 mL g(-)1 h(-1). In a 50 h high-pressure life-test, this catalyst showed a high resistance to both coking and sintering. It was found that CeO2 nanoparticles were selectively deposited on the surface of NiO rather than on Al2O3 due to the electrostatic interaction during the DP process, effectively preventing Ni particles from sintering during the reduction and reaction at high temperatures, and inhibiting coke formation by increasing the supply of active oxygen species on the nickel surface. As a result, the formed CeO2-decorated Ni/Al2O3 catalyst exhibited excellent catalytic performance and stability in CO methanation. This work demonstrated that catalytic properties could be much improved for a usual catalyst with a well-designed structure.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Chemistry, Multidisciplinary
研究领域[WOS]	Chemistry
关键词[WOS]	SYNTHETIC NATURAL-GAS ; ATOMIC LAYER DEPOSITION ; NI/AL2O3 CATALYSTS ; CARBON-DIOXIDE ; SYNGAS METHANATION ; OXIDATION ; OXIDE ; DEACTIVATION ; HYDROGEN ; PERFORMANCE
收录类别	SCI
原文出处	://WOS:000334681800036
语种	英语
WOS记录号	WOS:000334681800036
公开日期	2014-08-28
内容类型	期刊论文
版本	出版稿
源URL	[http://ir.ipe.ac.cn/handle/122111/10939]
专题	过程工程研究所_研究所（批量导入）
作者单位	1.Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China 2.ASTAR, Inst Chem Engn & Sci, Singapore 627833, Singapore
推荐引用方式 GB/T 7714	Liu, Qing,Gao, Jiajian,Zhang, Meiju,et al. Highly active and stable Ni/gamma-Al2O3 catalysts selectively deposited with CeO2 for CO methanation dagger[J]. RSC ADVANCES,2014,4(31):16094-16103.
APA	Liu, Qing.,Gao, Jiajian.,Zhang, Meiju.,Li, Huifang.,Gu, Fangna.,...&Su, Fabing.(2014).Highly active and stable Ni/gamma-Al2O3 catalysts selectively deposited with CeO2 for CO methanation dagger.RSC ADVANCES,4(31),16094-16103.
MLA	Liu, Qing,et al."Highly active and stable Ni/gamma-Al2O3 catalysts selectively deposited with CeO2 for CO methanation dagger".RSC ADVANCES 4.31(2014):16094-16103.