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Acetylene Selective Hydrogenation over Low-Content Pd Catalysts Based on Different Alumina Modifications Full article

Journal Journal of Catalysis
ISSN: 0021-9517 , E-ISSN: 1090-2694
Output data Year: 2026, Volume: 453, Article number : 116538, Pages count : 13 DOI: 10.1016/j.jcat.2025.116538
Tags Hydrogenation of acetylene; palladium-alumina catalysts; laser electrodispersion; incipient wetness impregnation; metal-support interactions
Authors Veselov Grigory B. 1 , Rostovshchikova Tatiana N. 2 , Krotova Irina N. 2 , Nikolaev Sergey A. 2 , Maslakov Konstantin I. 2 , Gurevich Sergey A. 3 , Yavsin Denis A. 3 , Shlyapin Dmitry A. 1 , Vedyagin Aleksey A. 1
Affiliations
1 Boreskov Institute of Catalysis, Novosibirsk 630090, Russia
2 Lomonosov Moscow State University, Moscow 119991, Russia
3 Ioffe Institute, St. Petersburg 194021, Russia

Funding (3)

1 Ministry of Science and Higher Education of the Russian Federation 0040-2019-0010
2 Ministry of Science and Higher Education of the Russian Federation АААА-А21-121011590090-7
3 Ministry of Science and Higher Education of the Russian Federation FWUR-2024-0034

Abstract: A series of alumina-based catalysts containing from 0.004 to 0.01 wt% of palladium were prepared via laser electrodispersion and impregnation methods. Three alumina modifications, γ-Al2O3, θ-Al2O3, and α-Al2O3, were used as supports. In the case of the laser electrodispersion method, Pd particles of 2.5 nm in size were evenly distributed on the outer surface of the alumina grains. Contrarily, the impregnation procedure provided the distribution of Pd throughout the whole volume of the support. The catalytic properties of the prepared samples were studied in an acetylene hydrogenation reaction. As found, the catalysts prepared by laser electrodispersion possess a slightly lower activity along with a higher selectivity compared to the impregnated ones. The phase modification of alumina was found to affect the catalytic behavior noticeably. Thus, a decrease in acetylene conversion and an increase in ethylene selectivity were observed for the following order: θ-Al2O3 > γ-Al2O3 > α-Al2O3. The main factors defining the efficiency of the catalysts are metal-support interactions, electronic state, and dispersion and distribution of Pd on the alumina surface. The strongest metal-support interaction was observed for the Pd/θ-Al2O3 sample prepared by laser electrodispersion. This sample has the highest content of Pd2+ species and exhibits high activity but low selectivity to ethylene. In the case of the α-Al2O3 support, Pd particles are located close to each other on the outer surface and, therefore, undergo fast deactivation. The X-ray photoelectron spectroscopy data revealed the carbon accumulation during the reaction for all the studied samples.
Cite: Veselov G.B. , Rostovshchikova T.N. , Krotova I.N. , Nikolaev S.A. , Maslakov K.I. , Gurevich S.A. , Yavsin D.A. , Shlyapin D.A. , Vedyagin A.A.
Acetylene Selective Hydrogenation over Low-Content Pd Catalysts Based on Different Alumina Modifications
Journal of Catalysis. 2026. V.453. 116538 :1-13. DOI: 10.1016/j.jcat.2025.116538 OpenAlex
Dates:
Submitted: Jul 16, 2025
Accepted: Oct 31, 2025
Published online: Nov 5, 2025
Published print: Jan 1, 2026
Identifiers:
OpenAlex: W4415930426
Citing: Пока нет цитирований
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