The effect of strong metal–support interaction (SMSI) on Pt–Ti/SiO2 and Pt–Nb/SiO2 catalysts for propane dehydrogenation
- Purdue Univ., West Lafayette, IN (United States)
- Chinese Academy of Sciences (CAS), Dalian (China)
- Purdue Univ., West Lafayette, IN (United States); Zhengzhou Univ. (China)
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Dalian Univ. of Technology (China)
- Purdue Univ., West Lafayette, IN (United States); Huaqiao Univ. (China)
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.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division; National Science Foundation (NSF); National Natural Science Foundation of China (NSFC); Fundamental Research Funds for the Central Universities; China Scholarship Council; USDOE
- Grant/Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1756890
- Alternate ID(s):
- OSTI ID: 1644147
- Journal Information:
- Catalysis Science and Technology, Vol. 10, Issue 17; ISSN 2044-4753
- Publisher:
- Royal Society of ChemistryCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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