Effect of the Nature of the Additives of Metal Cations (Sr, Ba,
and La) on the Properties of CoMo Hydrodesulfurization Catalysts

E. V. Korneeva, A. S. Ivanova, G. A. Bukhtiyarova, P. V. Aleksandrov,
V. I. Zaikovskii, I. P. Prosvirin, and A. S. Noskov

Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090 Russia

e-mail: kulko@catalysis.nsk.su

Received July 5, 2010

Abstract—The effect of the nature of the support modified with the ions of alkaline earth and rare earth ele-
ments (Sr, Ba, and La) on the properties of Co–Mo catalysts for the hydrodesulfurization of dibenzothiophene (DBT),
4-methyldibenzothiophene (4-MDBT), and 4,6-dimethyldibenzothiophene (4,6-DMDBT) was studied using a set
of physicochemical and catalytic techniques. It was found that the introduction of modifying additives
decreased the surface concentration of Lewis acid sites (LASs) and increased the concentration of basic sites
(BSs) in aluminum-containing supports; these changes were more significant upon modification with lantha-
num and strontium. The modification affected the distribution and degree of dispersion of Co–Mo–S sulfide
packets. It was found that the rate constants of DBT and 4-MDBT conversion increased with decreasing total
surface concentration of both LASs and BSs on the support. The highest rate constant of 4,6-DMDBT conver-
sion was reached at an optimum concentration of weak Lewis sites on Co–Mo catalysts, whose support was
modified with strontium or barium.

10.1134/S0023158411030128

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