期刊
CATALYSIS SCIENCE & TECHNOLOGY
卷 10, 期 21, 页码 7217-7225出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0cy01254h
关键词
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资金
- FCT PhD grant [SFRH/BD/128986/2017]
- Associate Laboratory LSRE-LCM - national funds through FCT/MCTES (PIDDAC) [UIDB/50020/2020]
- FCT [CEECINST/00049/2018]
- Fundação para a Ciência e a Tecnologia [SFRH/BD/128986/2017] Funding Source: FCT
The surface chemistry of the activated carbon supporting material was tailored to investigate the influence of O and N groups as well as O-free Lewis basic sites on the performance of Ni-based catalysts for CO2 methanation. Catalytic experiments demonstrated that 15% Ni on carbon with O-free Lewis basic sites showed the best performance (X-CO2 = 76%, S-CH4 = 97%, T = 450 degrees C, P = 1 bar), suggesting that the methanation reaction is highly dependent on the basicity of the support. Promotion with 5% Fe enabled the decrease of the optimal reaction temperature while improving the stability of the catalyst. Microstructural and compositional studies of the catalyst after a prolonged time on stream experiment suggested that the slight but gradual catalyst deactivation during methanation is associated with the sintering of Ni nanoparticles and the development of a distinct Ni@NiO core-shell nanostructure.
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