A strategy to regenerate coked and sintered Ni/Al2O3 catalyst for methanation reaction
Du, Jinping1,2; Gao, Jiajian2; Gu, Fangna2,3; Zhuang, Jiahao2; Lu, Bin2; Jia, Lihua1; Xu, Guangwen4; Liu, Qing5; Su, Fabing2,3,4

Supported Ni/Al2O3 catalysts are widely used in chemical industries. Regeneration of the deactivated Ni catalysts caused by sintering of Ni nanoparticles and carbon deposition after long-term operation is significant but still very challenging. In this work, a feasible strategy via solid-phase reaction between NiO and Al2O3 followed by a controlled reduction is developed which can burn out the deposited carbon and re-disperse the Ni nanoparticles well, thus regenerating the deactivated Ni catalysts. To demonstrate the feasibility of this method, Ni catalyst supported on alpha-Al2O3 (Ni/Al2O3) for CO methanation reaction was selected as a model system. The structure and composition of the fresh, deactivated and regenerated Ni/Al2O3 catalysts were comprehensively characterized by various techniques. The reduction and redistribution of Ni species as well as the interfacial interaction between Ni nanoparticles and Al2O3 support were investigated in detail. It is found that calcining the deactivated Ni/Al2O3 in air at high temperature can burn out the coke, while the sintered Ni species can combine with superficial Al2O3 to form a surface NiAl2O4 spinel phase through the solid-phase reaction. After the controlled reduction of the NiAl2O4 spinel, highly dispersed Ni nanoparticles on Al2O3 support are re-generated,thus achieving the regeneration of the deactivated Ni/Al2O3. Interestingly, compared with the fresh Ni/Al2O3 catalyst, the sizes of Ni nanoparticles became even smaller in the regenerated ones. The regenerated Ni/Al2O3 showed much enhanced catalytic activity in CO methanation and became more resistant to carbon deposition, due to the better dispersed Ni nanoparticles and strengthened interaction between Ni and Al2O3 support. Our work not only addresses

KeywordRegeneration Ni Catalyst Co Methanation Deactivation Nial2o4 Spinel
WOS KeywordSynthetic Natural-gas ; Water-oxidizing Catalysts ; Ni-based Catalyst ; Co Methanation ; Hydrogen-production ; Manganese Compounds ; Enhanced Activity ; Nickel-catalysts ; Composite Oxides ; Carbon-monoxide
Funding ProjectNational Natural Science Foundation of China[21476238] ; National Natural Science Foundation of China[21776286] ; National Key R&D Program of China[2018YFB0604501] ; Fund of State Key Laboratory of Multiphase complex systems[MPCS-2015-A-06]
WOS Research AreaChemistry ; Electrochemistry ; Energy & Fuels
WOS SubjectChemistry, Physical ; Electrochemistry ; Energy & Fuels
Funding OrganizationNational Natural Science Foundation of China ; National Key R&D Program of China ; Fund of State Key Laboratory of Multiphase complex systems
WOS IDWOS:000450539500031
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Document Type期刊论文
Corresponding AuthorGu, Fangna; Jia, Lihua; Su, Fabing
Affiliation1.Qiqihar Univ, Coll Chem & Chem Engn, Qiqihar 161006, Heilongjiang, Peoples R China
2.Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China
3.Langfang Econ & Tech Dev Zone, Zhongke Langfang Inst Proc Engn, Fenghua Rd 1, Langfang 065001, Hebei, Peoples R China
4.Shenyang Univ Chem Technol, Inst Ind Chem & Energy Technol, Shenyang 110142, Liaoning, Peoples R China
5.Shandong Univ Sci & Technol, Coll Chem & Environm Engn, Key Lab Low Carbon Energy & Chem Engn, Qingdao 266590, Shandong, Peoples R China
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Du, Jinping,Gao, Jiajian,Gu, Fangna,et al. A strategy to regenerate coked and sintered Ni/Al2O3 catalyst for methanation reaction[J]. INTERNATIONAL JOURNAL OF HYDROGEN ENERGY,2018,43(45):20661-20670.
APA Du, Jinping.,Gao, Jiajian.,Gu, Fangna.,Zhuang, Jiahao.,Lu, Bin.,...&Su, Fabing.(2018).A strategy to regenerate coked and sintered Ni/Al2O3 catalyst for methanation reaction.INTERNATIONAL JOURNAL OF HYDROGEN ENERGY,43(45),20661-20670.
MLA Du, Jinping,et al."A strategy to regenerate coked and sintered Ni/Al2O3 catalyst for methanation reaction".INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 43.45(2018):20661-20670.
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