期刊
CATALYSTS
卷 10, 期 6, 页码 -出版社
MDPI
DOI: 10.3390/catal10060658
关键词
ammonia synthesis; cobalt catalyst; synergistic effect; cerium promoter; barium promoter; barium cerate
资金
- National Science Centre, Poland [2016/23/N/ST5/00685]
- Polish Ministry of Science and Higher Education [DI2015 019445]
This study explains a co-promoting interaction of cerium and barium additives in a cobalt catalyst used for ammonia synthesis. The results show that a synergistic effect of Ce and Ba promoters in the catalyst is associated with an emergence of a third promoter-BaCeO3-which forms in situ from its individual components during catalyst activation. The influence of perovskite-type barium cerate is substantial due to its strong basic properties, i.e. high electron-donating ability and a tendency to stabilize the Co hcp cobalt phase (more active in ammonia synthesis than the Co fcc phase). BaCeO(3)diversifies the structure of adsorption sites on the cobalt surface by contributing to the exposure of facets with more favourable adsorption and binding energies with regards to rate-limiting reactions steps. It allows to a more fluent formation and transfer of species unrestricted by the hydrogen or product poisoning consequently accelerating the entire ammonia synthesis process.
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