Effects of K, Cu and Zn addition on the Fischer-Tropsch synthesis activity of the precipitated Fe catalyst in the absence and presence of CO_2 at low temperature

摘要

Fischer-Tropsch synthesis (FTS) reaction with Fe-based catalysts can produce various kinds of hydrocarbons including olefins, paraffins and/or oxygenates. Their product selectivity sensitively changes depending on the reaction temperature, H_2/CO ratio of syngas, catalyst composition, and so on [1-6], which makes the Fe catalysts more flexible in the need of commercial markets. However, the syngas conversion over the Fe catalysts usually decreases with time on stream. In order to minimize reactor downtime and catalyst consumption, it is a quite important issue to improve not only the FTS activity but also the stability of the Fe catalysts during on stream [6].