期刊
TOPICS IN CATALYSIS
卷 54, 期 13-15, 页码 977-985出版社
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s11244-011-9719-5
关键词
Fischer-Tropsch; Cobalt; Alumina; Water effect; Copper; Water-gas shift
资金
- Swedish Energy Agency
- SGC (Svenskt Gastekniskt Center)
A series of different mechanical mixtures of a narrow-pore Co/c-Al2O3 catalyst and a Cu-based WGS-catalyst has been investigated in the low-temperature Fischer-Tropsch synthesis (483 K, 20 bar) with a model bio-syngas (H-2/CO = 1.0) in a fixed-bed reactor. The higher the fraction of WGS-catalyst in the mixture, the lower is the Co-catalyst-time yield to hydrocarbons. This is ascribed to a strong positive kinetic effect of water on the Fischer-Tropsch rate of the Co-catalyst, showing the importance of the indigenously produced water, especially in fixed-bed reactors where the partial pressure of water is zero at the reactor inlet. A preliminary kinetic modeling suggests that the reaction order in P-H2O is 0.3 for the Co/c-Al2O3 catalyst in the range of the studied reactor-average partial pressures of water (i.e., 0.04-1.2 bar).
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