CO2 gasification of petroleum coke with use of iron-based waste catalyst from F-T synthesis

Abstract

In this study, the influence of iron-based waste catalyst (IWC) from F-T synthesis as a cheap additive on the gasification reaction characteristics of petroleum coke (PC) with CO2 at 1000–1300°C was investigated by thermogravimetric analyzer. The gasification kinetics of PC was analyzed by free model method. The surface complexes of PC were determined through temperature-programmed desorption (TPD) methods to reveal the mechanism of IWC catalytic PC gasification. The results show that IWC is an efficient PC gasification catalyst and can reduce the activation energy of PC CO2 gasification. The induction of iron in IWC makes the surface of PC have more activated carbon sites, thereby forming more oxygen-containing intermediates, and the cyclic redox reaction of iron can act as an oxygen carrier to accelerate the reaction of CO2 and carbon, both of these may be the essential reasons for the CO2 gasification of PC catalyzed by IWC.