Selective hydrotreating of FCC gasoline over KCoMoP/Al2O3 catalysts prepared with H3PMo12O40: Effect of metal loading

Selective hydrotreating of FCC gasoline over KCoMoP/Al2O3 catalysts prepared with H3PMo12O40: Effect of metal loading

Type	Journal Article
Author	P. Nikulshin
Author	D. Ishutenko
URL	http://www.sciencedirect.com/science/article/pii/S0016236116304677
Volume	182
Pages	632-639
Publication	Fuel
Date	October 15, 2016
Abstract	Researchers fabricated d-Kx-CoMoP/Al2O3 catalysts with various Mo loading (d) equal to 2, 3 and 5 at Mo/nm2 and varied up to 2 of K/Mo molar ratio (x) using H3PMo12O40, CoCO3, KOH and citric acid. They found that the introduction of a higher amount of K and Mo in the KxCoMoP catalyst led to enhancement of metal sulfidation and formation of KCoMoS phase species with large sizes.  Maximal selectivity factor and low RON less after hydrotreating of FCC gasoline was achieved over 5-K1.5CoMoP catalyst. Both 3-K1.5CoMoP and 2-K1.5CoMoP catalysts contained lower Mo loading had reduced HDS and HYDO activities compared with 5-K1.5CoMoP analog having the same K/Mo ratio. However, 2-K1.5CoMoP and 3-K1.5CoMoP catalysts had a higher selectivity factor, then 5-CoMoP analog having higher Mo loading and similar morphology of active phase species. Introduction of potassium decreased the apparent activation energy and pre-exponential factor of the both HDS and HYDO reactions. Researchers determined that the alkali metal changes the properties and concentrations of both types of the active sites on the KCoMoS2 slabs by a similar mechanism.