Effect of a Method for Introducing Palladium into Al2O3 Granules on Catalytic Properties and Activity in the Reaction of Deep Oxidation of Methane
N. V. SHIKINA1,2, N. A. RUDINA2, A. I. BORONIN2, S. A. YASHNIK2, A. A. MOROZ1, E. P. SUROVOY3, and Z. R. ISMAGILOV1,2
1Institute of Coal and Chemical Materials Science, Federal Research Centre of Coal and Coal Chemistry, Siberian Branch, Russian Academy of Sciences, Kemerovo, Russia
E-mail: shikina@catalysis.ru
2Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
3Kemerovo State University, Kemerovo, Russia
Keywords: Pd catalysts, sol-gel, impregnation, adsorption, deposition, methane oxidation
Abstract
The effect of techniques for introducing Pd into γ-Al2O3 from palladium chloride solutions on physicochemical and catalytic properties of PdO(Pd)/Al2O3 catalysts was examined. A series of catalysts were investigated by SEM, XPA, BET, XPS, and H2-TPR. As shown, the use of various methods for introducing Pd into alumina granules enables control of active component distribution along the Al2O3
granule section. The localization of Pd in a catalyst grain determines the
nature of the reduction in H2-TPR and activity in
the reaction of deep oxidation of methane, which is connected with a varying
degree of the interaction of the active component with the support. The active
component is demonstrated to be formed on the granule surface mainly as PdO
when using the adsorption-deposition method followed by calcination at a
temperature of 1000 °C ensuring high reactivity in the methane oxidation
reaction.
DOI: 10.15372/CSD820180616
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