Comparable investigation of spillover and cobalt promoter effects in CoMoS/CoSx/SiO2 catalysts for selective hydrotreating of model FCC gasoline

Cox-Co2Mo10/SiO2 and Co2Mo10/Cox/SiO2 catalysts with various Co/Mo ratios and active species compositions are prepared using H6[Co2Mo10O38H4] heteropolyacid, CoCO3 and citric acid. Catalysts are characterized using the following techniques: low-temperature N2 adsorption, temperature-programmed reduc...

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Bibliographic Details
Published in:	Fuel processing technology Vol. 156; pp. 98 - 106
Main Authors:	Pimerzin, Al. A., Ishutenko, D.I., Mozhaev, A.V., Kapustin, V.M., Chernysheva, E.A., Maximova, A.V., Pimerzin, A.A., Nikulshin, P.A.
Format:	Journal Article
Language:	English
Published:	Elsevier B.V 01-02-2017
Subjects:	CoMoS Hexene-1 Hydrogen spillover Selective hydrodesulphurization Thiophene Selective hydrodesulphurization Thiophene CoMoS Hydrogen spillover Hexene-1
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Summary:	Cox-Co2Mo10/SiO2 and Co2Mo10/Cox/SiO2 catalysts with various Co/Mo ratios and active species compositions are prepared using H6[Co2Mo10O38H4] heteropolyacid, CoCO3 and citric acid. Catalysts are characterized using the following techniques: low-temperature N2 adsorption, temperature-programmed reduction, high-resolution transmission electron microscopy, and X-ray photoelectron spectroscopy. Catalytic activities of the synthesized catalysts are examined in hydrotreating of model fluid catalytic cracking (FCC) gasoline that contains 1000ppm of sulphur from thiophene and 36wt.% of n-hexene-1. As the Co/Mo ratio increases, hydrodesulphurization (HDS) and hydrogenation (HYD) activities of the prepared catalysts significantly builds up. The changes of catalytic properties and specifically of the HDS/HYDO selectivity factor of the synthesized CoMo catalysts arise from two effects: an alteration of the promotion degree of CoMoS active phase particles and a hydrogen spillover from CoSx species to active sites. The developed silica-supported CoMo catalysts may be a prospect for selective HDS and hydro-upgrading of FCC gasoline. [Display omitted] •Cox-Co2Mo10/Cox/SiO2 catalysts with various Co content in precursor or support are prepared.•Thiophene and hexene-1 conversions increase with Co loading.•HDS/HYDO selectivity increases with CoMoS promotion.•HDS/HYDO selectivity decreases due to CoSx/SiO2 and H2 spillover.•TPR confirms that CoSx/SiO2 facilitates the reduction of MoS2/SiO2 in separate bed.•Catalyst with fully promoted edges' active sites has highest selectivity factor.
ISSN:	0378-3820 1873-7188
DOI:	10.1016/j.fuproc.2016.10.023