Abstract
The structure of Ga2O3–Al2O3 supports and Pd/Ga2O3–Al2O3 catalysts and the performance of these catalysts in liquid-phase acetylene hydrogenation have been investigated. The deposition of Ga(NO3)3 onto Al2O3 by impregnation followed by calcination of the impregnated support at 600°C yields γ-Ga2O3–Al2O3 solid solutions containing up to 50 wt % Ga2O3. X-ray diffraction characterization of model palladium catalysts and their temperature-programmed reduction with hydrogen have demonstrated that, while palladium in Pd/Ga2O3 is in the form of a Pd2Ga alloy, in the Pd/γ-Ga2O3–Al2O3 catalyst there is no direct interaction between PdО and Ga2O3 particles and palladium is in the monometallic state. The introduction of 10–20 wt % gallium oxide into Al2O3 lowers the activity of the supported palladium catalyst relative to that of the initial Pd/Al2O3 but increases the ethylene yield by enhancing the ethylene formation selectivity.
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Original Russian Text © T.N. Afonasenko, N.S. Smirnova, V.L. Temerev, N.N. Leont’eva, T.I. Gulyaeva, P.G. Tsyrul’nikov, 2016, published in Kinetika i Kataliz, 2016, Vol. 57, No. 4, pp. 493–500.
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Afonasenko, T.N., Smirnova, N.S., Temerev, V.L. et al. Pd/Ga2O3–Al2O3 catalysts for the selective liquid-phase hydrogenation of acetylene to ethylene. Kinet Catal 57, 490–496 (2016). https://doi.org/10.1134/S0023158416040017
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DOI: https://doi.org/10.1134/S0023158416040017