Influence of the Rh Nanoparticle Size and Rh Precursor Nature on Decalin Ring Opening over Rh/Al2O3 Catalysts

Influence of the Rh Nanoparticle Size and Rh Precursor Nature on Decalin Ring Opening over Rh/Al2O3 Catalysts Full article

Journal

Catalysis Letters
ISSN: 1572-879X , E-ISSN: 1011-372X

Output data

Year: 2025, Volume: 155, Number: 3, Article number : 98, Pages count : DOI: 10.1007/s10562-024-04925-2

Authors

Finashina Elena D. ¹ , Tkachenko Olga P. ¹ , Kartavova Kristina E. ² , Greish Alexander A. ¹ , Kustov Alexander L. ^2,1 , Davshan Nikolay A. ¹ , Tolkachev Nikolay N. ¹ , Kustov Leonid M. ^2,1

Affiliations

1	N.D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prospect 47, Moscow, Russia, 119991
2	Chemistry Department, Moscow State University, Leninskie Gory 1, Bldg. 3, Moscow, Russia, 119992

A series of 1%Rh/γ-Al2O3 catalysts was prepared using different Rh-containing precursors (chloride, nitrate, and complex [Rh(NH3)5Cl]Cl2). The catalysts prepared in this work were characterized by various physicochemical methods. Textural and acid–base properties, metal dispersion and metal charge state were characterized by nitrogen adsorption–desorption analysis, scanning electron microscopy with the energy dispersive X-ray analysis, diffuse-reflectance Fourier-transform infrared spectroscopy, transmission electron microscopy, CO chemisorption, X-ray photoelectron spectroscopy. The activity and selectivity of the catalysts were tested in the reaction of decalin ring opening under high pressures. The XPS study showed that rhodium in the surface layers of the samples is present in a metallic state. However, a small positive charge (δ+) is observed on the rhodium atoms due to the interaction of dispersed metal particles with the carrier. This effect is especially noticeable for the sample prepared using the Rh(NO3)3 precursor. According to the data, all studied catalysts allow one to obtain a similar set of reaction products, where C10 alkylcyclohexanes predominate. The catalyst activity decreases in the NO3− > Cl− > [Rh(NH3)5Cl]Cl2 series, that is in the inverse correlation with the rhodium particle size 1.5 nm < 2.2 nm < 17.2 nm (determined by the CO chemisorption method) and 1.7 nm < 2.3 nm < 6.6 nm (determined by TEM). The catalyst synthesized on the basis of rhodium nitrate demonstrates a reaction selectivity close to 74% for the partial ring opening at the total decalin conversion of 67%. The highest activity and selectivity for this catalyst are possibly accounted for by the relatively small size of metal particles formed on the alumina support. Also, some changes in the activity and selectivity of the catalysts observed with variation of the major reaction parameters, such as temperature, pressure, space velocity and H2/C10 molar ratio were determined.

Finashina E.D. , Tkachenko O.P. , Kartavova K.E. , Greish A.A. , Kustov A.L. , Davshan N.A. , Tolkachev N.N. , Kustov L.M.
Influence of the Rh Nanoparticle Size and Rh Precursor Nature on Decalin Ring Opening over Rh/Al2O3 Catalysts
Catalysis Letters. 2025. V.155. N3. 98 . DOI: 10.1007/s10562-024-04925-2 WOS Scopus OpenAlex

Web of science:	WOS:001403055700001
Scopus:	2-s2.0-85217741933
OpenAlex:	W4406659798

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