Advanced De-SO x catalyst: Mixed solid solution spinels with cerium oxide

Abstract

Mixed solid solution spinels impregnated with cerium, Ce/MgO·MgAl 2- x M x O 4 (MFe, V, Cr, x≤0.4), were studied for controlling the SO x emission from the fluid catalytic cracking (FCC) regenerator. An insufficient sulfur release problem inherent to the earlier DeSO x catalyst, Ce/MgO·MgAl 2O 4, was effectively overcome by incorporating a transition metal into the spinel structure. Studies of the SO x pick-up, temperature profile for the sulfate reduction, the thermal analysis, and the DeSO x cycle test in the batch as well as the automated continuous reactor are discussed to define the role of a transition metal in the mixed spinels for the DeSO x performance. These advanced DeSO x catalysts have led to a commercial success for the simultaneous control of SO x and NO x emissions from the FCC regenerator.