Kinetics and Catalysis. Vol. 59, No. 2, Pages 136-142, 2018

V. A. Borisov^a^,^b^, *, K. N. Iost^a, V. L. Temerev^a, N. N. Leont’eva^a, I. V. Muromtsev^a, A. B. Arbuzov^a^,^c, M. V. Trenikhin^a^,^b^,^c, G. G. Savel’eva^a, N. S. Smirnova^d, and D. A. Shlyapin^a
Translated by S. Lebedev

^aInstitute of Hydrocarbon Processing, Siberian Branch, Russian Academy of Sciences, Omsk, 644050 Russia

^cOmsk Scientific Center, Siberian Branch, Russian Academy of Sciences, Omsk, 644024 Russia

^dKurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Moscow, 119991 Russia

Abstract—A method for fractionation of the starting carbon composite Sibunit by density was used to obtain three samples of Sibunit with different values of the specific surface area: Sib10 at 439 m²/g, Sib13 at 389 m²/g, and Sib17 at 256 m²/g. Investigation of Sibunits using both methods, that is, X-ray diffraction analysis and combination (Raman) scattering spectroscopy, did not reveal significant differences (the parameters of the crystal lattice and the I_D/I_G ratio). The fractionated supports were used to obtain Ru-containing catalysts for ammonia decomposition reaction (0.1 MPa, 400°C). The dependence of the specific catalytic activity calculated per 1 m² of the support specific surface a for catalysts of the same composition (4.0% Ru and 13.6% Cs) has an extreme form. The authors connect this with two factors: the blocking support pores contain an active component and a change in features of ruthenium interactions with the promoter (Cs) of the catalyst.

Keywords: Sibunit, specific surface area, ammonia decomposition, ruthenium catalysts, specific catalytic activity, cesium promoter

The Influence of the Specific Surface Area of the Carbon Support on the Activity of Ruthenium Catalysts for the Ammonia-Decomposition Reaction