Pore size effects in high-temperature Fischer–Tropsch synthesis over supported iron catalystsстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
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Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 19 сентября 2015 г.
Аннотация:This paper addresses the effect of support pore sizes on the structure and performance of iron catalysts
supported by mesoporous silicas in high-temperature Fischer–Tropsch synthesis. A combination of
characterization techniques showed that the size of supported iron particles was controlled by catalyst
pore sizes. The larger iron particles were localized in large-pore supports.
Iron carbidization with carbon monoxide resulted in preferential formation of Hägg iron carbide
(v-Fe5C2). Larger iron oxide crystallites in large-pore supports were much easier to carbidize than smaller
iron oxide counterparts in small-pore supports. The catalytic performance in Fischer–Tropsch synthesis
was attributed to iron carbide. Higher Fischer–Tropsch reaction rates, higher olefin, and C5+ selectivity
were observed over larger pore iron catalysts. High dispersion of iron oxide in small-pore silicas was
not favorable for carbon monoxide hydrogenation because of poor iron carbidization.