期刊
CHEMSUSCHEM
卷 9, 期 17, 页码 2326-2331出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201600710
关键词
carbon dioxide; hydrogenation; mesoporous silica; methane selectivity; nickel
资金
- Ministry of Science and Technology of Taiwan [MOST 102-2113M-008-006-MY3]
Ni nanoparticles (around 4nm diameter) were successfully supported on cage-type mesoporous silica SBA-16 (denoted as Ni@SBA-16) via wet impregnation at pH9, followed by the calcination-reduction process. The Ni@SBA-16 catalyst with a very high Ni loading amount (22.9wt%) exhibited exceptionally high CH4 selectivity for CO2 hydrogenation. At a nearly identical loading amount, the Ni@SBA-16 catalysts with smaller particle size of Ni NPs surprisingly exhibited a higher catalytic activity of CO2 hydrogenation and also led to a higher selectivity on CH4 formation than the Ni@SiO2 catalysts. This enhanced activity of the Ni@SBA-16 catalyst is suggested to be an accumulative result of the advantageous structural properties of the support SBA-16 and the well confined Ni NPs within the support; both induced a favorable reaction pathway for high selectivity of CH4 in CO2 hydrogenation.
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