EFFECT OF K PROMOTER ON THE STRUCTURE AND CATALYTIC BEHAVIOR OF SUPPORTED IRON-BASED CATALYSTS IN FISCHER-TROPSCH SYNTHESIS

摘要

Effects of K addition on the performance of supported Fe catalysts for Fischer-Tropsch synthesis (FTS) were studied in a slurry reactor at 240 to 270°C, 2.0 to 4.0 MPa and syngas H2/CO = 1.0. The catalysts were characterized by N2 adsorption, H2 temperature programmed reduction, X-ray diffraction, X-ray fluorescence, thermogravimetric analysis, scanning electron microscopy and dispersive X-ray spectroscopy. A strong interaction was observed between Fe and K, which inhibited the reduction of Fe catalyst. Addition of potassium increased the production of heavy hydrocarbons (C20+).