期刊
CATALYSIS SCIENCE & TECHNOLOGY
卷 6, 期 7, 页码 2305-2317出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5cy01200g
关键词
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资金
- Spanish Government [CTQ2011-22767, MAT2014-52416-P]
- European Regional Development Funds (ERDF)
- IREC Foundation
- Spanish Ministry of Economy and Competitiveness [RYC-2011-09202]
Takovite-derived mixed oxides in Ni/Al molar ratios from 1 to 3 have been used as catalysts in hydrogenation of CO2 to CH4. The catalysts were characterized by XRD, BET, TEM, TGA, and H-2-TPR, and monitored by in situ DRIFTS under reaction conditions. The catalytic performance for the CO2 methanation has been investigated in a fixed-bed reactor at the temperature range from 225 to 400 degrees C and pressures of 10.0 and 1.0 bar(g). Takovite decomposition leads to the formation of a NiO phase containing Al ions and a nickel-containing alumina phase (Ni-deficient spinel). The percentage of spinel increases upon decreasing the Ni/Al ratio, and consequently, a lower amount of metallic nickel after subsequent reduction is achieved. All catalysts were partially reduced upon time on stream, leading to the formation of small Ni-0 crystallites (ca. 3 nm) dispersed on a NiAl2O4 matrix. The most active and selective catalyst was the one with a Ni/Al ratio of 2, which was also very stable after a 500 h lifetime test at atmospheric pressure and 275 degrees C.
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