Volume 229, 2021

Mechanistic in situ investigation of heterogeneous hydrogenation over Rh/TiO2 catalysts: selectivity, pairwise route and catalyst nature

Abstract

The selectivity of product formation is strongly correlated with the nature of the catalyst active centers. Therefore, the selective synthesis of active sites with certain structure is a big challenge in modern catalysis. Here synthetic procedures are adopted for the formation of 1% Rh/TiO2 catalysts with different properties. It is shown that the nature of the precursor used for catalyst preparation is important, and that the use of a solution of rhodium acetate instead of rhodium nitrate leads to the selective formation of butenes during 1,3-butadiene hydrogenation. The use of parahydrogen in the reaction results in the enhancement of NMR signals via parahydrogen-induced polarization (PHIP) for all synthesized catalysts, and this signal enhancement increases with increasing catalyst calcination temperature. This effect is explained by the decoration of rhodium nanoparticles with titania which restricts hydrogen mobility on the surface, leading to the highest reported to date selectivity toward the pairwise hydrogen addition route of 7% for supported metal catalysts.

Graphical abstract: Mechanistic in situ investigation of heterogeneous hydrogenation over Rh/TiO2 catalysts: selectivity, pairwise route and catalyst nature

Associated articles

Supplementary files

Article information

Article type
Paper
Submitted
11 ডিসে. 2019
Accepted
27 জানু. 2020
First published
30 জানু. 2020

Faraday Discuss., 2021,229, 161-175

Mechanistic in situ investigation of heterogeneous hydrogenation over Rh/TiO2 catalysts: selectivity, pairwise route and catalyst nature

Ekaterina V. Pokochueva, D. B. Burueva, L. M. Kovtunova, A. V. Bukhtiyarov, A. Yu. Gladky, K. V. Kovtunov, I. V. Koptyug and V. I. Bukhtiyarov, Faraday Discuss., 2021, 229, 161 DOI: 10.1039/C9FD00138G

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