Issue 17, 2020

The effect of strong metal–support interaction (SMSI) on Pt–Ti/SiO2 and Pt–Nb/SiO2 catalysts for propane dehydrogenation

Abstract

In this study, we show how strong metal–support interaction (SMSI) oxides in Pt–Nb/SiO2 and Pt–Ti/SiO2 affect the electronic, geometric and catalytic properties for propane dehydrogenation. Transmission electron microscopy (TEM), CO chemisorption, and decrease in the catalytic rates per gram Pt confirm that the Pt nanoparticles were partially covered by the SMSI oxides. X-ray absorption near edge structure (XANES), in situ X-ray photoelectron spectroscopy (XPS), and resonant inelastic X-ray scattering (RIXS) showed little change in the energy of Pt valence orbitals upon interaction with SMSI oxides. The catalytic activity per mol of Pt for ethylene hydrogenation and propane dehydrogenation was lower due to fewer exposed Pt sites, while turnover rates were similar. The SMSI oxides, however, significantly increase the propylene selectivity for the latter reaction compared to Pt/SiO2. In the SMSI catalysts, the higher olefin selectivity is suggested to be due to the smaller exposed Pt ensemble sites, which result in suppression of the alkane hydrogenolysis reaction; while the exposed atoms remain active for dehydrogenation.

Graphical abstract: The effect of strong metal–support interaction (SMSI) on Pt–Ti/SiO2 and Pt–Nb/SiO2 catalysts for propane dehydrogenation

Supplementary files

Article information

Article type
Paper
Submitted
03 May 2020
Accepted
22 Jul 2020
First published
23 Jul 2020

Catal. Sci. Technol., 2020,10, 5973-5982

Author version available

The effect of strong metal–support interaction (SMSI) on Pt–Ti/SiO2 and Pt–Nb/SiO2 catalysts for propane dehydrogenation

J. Zhu Chen, J. Gao, P. R. Probus, W. Liu, X. Wu, E. C. Wegener, A. J. Kropf, D. Zemlyanov, G. Zhang, X. Yang and J. T. Miller, Catal. Sci. Technol., 2020, 10, 5973 DOI: 10.1039/D0CY00897D

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