Journal article
Methanation of CO2 over Zeolite-Encapsulated Nickel Nanoparticles
Efficient methanation of CO2 relies on the development of more selective and stable heterogeneous catalysts. Here we present a simple and effective method to encapsulate Ni nanoparticles in zeolite silicalite-1. In this method, the zeolite is modified by selective desilication, which creates intra-particle voids and mesopores that facilitate the formation of small and well-dispersed nanoparticles upon impregnation and reduction.
TEM and XPS analysis confirm that a significant part of the Ni nanoparticles are situated inside the zeolite rather than on the outer surface. The encapsulation results in an increased metal dispersion and, consequently, a high catalytic activity for CO2 methanation. With a gas hourly space velocity of 60000 ml/g catalyst h-1 and H2/CO2=4, the zeolite-encapsulated Ni nanoparticles result in 60% conversion at 450°C, which corresponds to a site-time yield of around 304 mol CH4/mol Ni h-1.
The encapsulated Ni nanoparticles show no change in activity or selectivity after 50 h of operation, although post-catalysis characteri-sation reveals some particle migration.
Language: | English |
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Year: | 2018 |
Pages: | 1566-1570 |
ISSN: | 18673899 and 18673880 |
Types: | Journal article |
DOI: | 10.1002/cctc.201701946 |
ORCIDs: | 0000-0003-2100-4310 , 0000-0002-2475-606X , Kegnæs, Søren , Mielby, Jerrik Jørgen and Goodarzi, Farnoosh |