Relation between composition and morphology of K(Co)MoS active phase species and their performances in hydrotreating of model FCC gasoline

Relation between composition and morphology of K(Co)MoS active phase species and their performances in hydrotreating of model FCC gasoline

Type	Journal Article
Author	D. Ishutenko
Author	P. Nikulshin
URL	http://www.sciencedirect.com/science/article/pii/S0920586115007580
Series	International Symposium On Advances In Hydroprocessing Of Oil Fraction (Isahof 2015)
Volume	271
Pages	16-27
Publication	Catalysis Today
Date	August 1, 2016
Abstract	K-Mo/Al2O3 and K-CoMo/Al2O3 catalysts with various amount of potassium were fabricated using H3PMo12O40, CoCO3 and KOH. The catalysts were tested in hydrotreating of model fluid catalytic cracking gasoline containing 1000 ppm of sulphur from thiophene and 36 wt. % of n-hexene-1. Researchers found that potassium incorporation led to the strong changes in both physical-chemical characteristics and catalytic behavior of sulfide catalysts. The use of potassium favored the growth of average slab length and sulfidation degree of metals with selective formation of CoMoS active phase. Addition of potassium also led to the partial poisoning of the active sites that resulted in decrease of catalyst activities compared with the reference Mo/Al2O3 and CoMo/Al2O3 samples. Olefin hydrogenation was more sensitive to potassium than thiophene hydrodesulphurization what resulted in the growth of the dependence of selectivity factor on potassium content in the catalysts.