Cooperation Between Active Metal and Basic Support in Ni-Based Catalyst for Low-Temperature CO2 Methanation

The key challenge for CO 2 methanation, an eight-electron process under kinetic limitation, relies on the design of non-noble metal catalysts so as to achieve high activity at low reaction temperatures. In this work, four Ni-based catalysts with different supports were prepared and tested for CO 2 m...

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Vydáno v:	Catalysis letters Ročník 150; číslo 5; s. 1418 - 1426
Hlavní autoři:	Ma, Yuan, Liu, Jiao, Chu, Mo, Yue, Junrong, Cui, Yanbin, Xu, Guangwen
Médium:	Journal Article
Jazyk:	angličtina
Vydáno:	New York Springer US 01.05.2020 Springer Nature B.V
Témata:	Aluminum oxide Carbon dioxide Catalysis Catalysts Cerium oxides Chemistry Chemistry and Materials Science Fixed beds Industrial Chemistry/Chemical Engineering Low temperature Methanation Nanoparticles Nickel Noble metals Organometallic Chemistry Physical Chemistry Titanium dioxide Zirconium dioxide Ni/CeO Basic site Support methanation TPD CO Catalyst
ISSN:	1011-372X, 1572-879X
On-line přístup:	Získat plný text
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Shrnutí:	The key challenge for CO 2 methanation, an eight-electron process under kinetic limitation, relies on the design of non-noble metal catalysts so as to achieve high activity at low reaction temperatures. In this work, four Ni-based catalysts with different supports were prepared and tested for CO 2 methanation at 250–550 °C in a fixed bed quartz reactor and further characterized to reveal the structure–function relationship. The Ni-based catalysts followed an activity order of Ni/CeO 2 > Ni/Al 2 O 3 > Ni/TiO 2 > Ni/ZrO 2 , especially at temperatures lower than 350 °C. H 2 -TPR and TPD results indicated that the interaction between nickel and support was strong and the metallic nickel was well dispersed in the Ni/Al 2 O 3 catalyst, while more amount of CO 2 was adsorbed on the weak basic sites in the Ni/CeO 2 catalyst. By establishing the correlation between the catalytic performance and the catalyst structure, it was found that the Ni nanoparticles and basic support serve as H 2 and CO 2 active centers respectively and cooperatively catalyze CO 2 methanation, resulting in high low-temperature reaction activity. Graphic Abstract High CO 2 conversion was achieved over Ni/CeO 2 catalyst at 300 °C for its high H 2 uptake on Ni nanoparticles and high CO 2 adsorption capacity on the support with weak basic sites and cooperatively to catalyze CO 2 methanation.
Bibliografie:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 14
ISSN:	1011-372X 1572-879X
DOI:	10.1007/s10562-019-03033-w