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Highly active and stable Ni/gamma-Al2O3 catalysts selectively deposited with CeO2 for CO methanation dagger
Alternative TitleRSC Adv.
Liu, Qing1; Gao, Jiajian1; Zhang, Meiju1; Li, Huifang1; Gu, Fangna1; Xu, Guangwen1; Zhong, Ziyi2; Su, Fabing1
2014
Source PublicationRSC ADVANCES
ISSN2046-2069
Volume4Issue:31Pages:16094-16103
AbstractWe 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.; 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.
KeywordSynthetic Natural-gas Atomic Layer Deposition Ni/al2o3 Catalysts Carbon-dioxide Syngas Methanation Oxidation Oxide Deactivation Hydrogen Performance
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1039/c4ra00746h
URL查看原文
Indexed BySCI
Language英语
WOS KeywordSYNTHETIC NATURAL-GAS ; ATOMIC LAYER DEPOSITION ; NI/AL2O3 CATALYSTS ; CARBON-DIOXIDE ; SYNGAS METHANATION ; OXIDATION ; OXIDE ; DEACTIVATION ; HYDROGEN ; PERFORMANCE
WOS Research AreaChemistry
WOS SubjectChemistry, Multidisciplinary
WOS IDWOS:000334681800036
Citation statistics
Cited Times:68[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.ipe.ac.cn/handle/122111/10939
Collection研究所(批量导入)
Affiliation1.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
Recommended Citation
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.
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