Iron/silicon-based catalyst exhibiting high selectivity to C2-C6 alkenes in CO/H2 Fischer-Tropsch reactions

摘要

Finely divided, hydrogen-activated catalyst compositions comprising iron, silicon and carbon or iron and silicon that selectively convert gaseous mixtures of CO and H2, at a temperature of about 150 DEG -450 DEG C. and at pressures of about 10-2000 kPa, into reaction mixture containing at least about 75% C2-C6 alkenes and no more than about 25% of CH4 and undesirable CO2 by-products are disclosed. A wide range of iron/silicon-based catalyst compositions are conveniently prepared by laser pyrolysis and hydrogen-pretreatment and readily reactivated with hydrogen at elevated temperatures.