Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 310, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2022.121303
Keywords
CO2 methanation; Co-based catalyst; Layered double hydroxide; Nanoparticle; Low temperature
Funding
- National Natural Science Foundation of China [21965029, 21968025]
- Innova-tion Leadership Program in Sciences and Technologies of Ningxia [2020GKLRLX09]
- Fourth Batch of Ningxia Youth Talents Supporting Program [TJGC2019022]
- West Light Foundation of the Chinese Academy of Sciences [XAB2019AW02]
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A series of layered Co-Al-O catalysts were prepared via a hydrothermal method and reduced at different temperatures. The results showed that the Co-0 content and basic sites on the catalysts increased and then decreased with the reduction temperature, leading to effective hydrogen dissociation and CO2 adsorption. The CoAl-O-600 catalyst exhibited superior performance in CO2 methanation at low temperature and showed excellent resistance to coking and sintering.
A series of layered Co-Al-O catalysts derived from hydrotalcites for low-temperature CO2 methanation were prepared via a hydrothermal method and reduced at 500, 550, 600, 650, and 700 degrees C, respectively. The characterisation results from XPS and CO2 -TPD revealed that the Co-0 content and basic sites over these catalysts were firstly increased and then decreased with the reduction temperature increasing, which led to the efficient dissociation of H-2 and CO(2 )adsorption. In situ DRIFTS measurements revealed that the formation of CH4 proceeded via the hydrogenation of carbonate and formate as intermediates. A superior catalytic performance of CoAl-O-600 catalyst for CO2 methanation was achieved with a CO2 conversion of 74% and a CH4 selectivity of 99% at low temperature of 250 degrees C. Moreover, it exhibited excellent resistance to coking and sintering upon a 240 h time on stream operation.
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