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Influence of Nanoscale Intimacy in Bi-Functional Catalysts for CO 2 -Assisted Dehydrogenation of C 5 -Paraffins.
- Source :
- Catalysts (2073-4344); Jun2023, Vol. 13 Issue 6, p933, 11p
- Publication Year :
- 2023
-
Abstract
- In this study, Pt<subscript>1</subscript>Sn<subscript>1</subscript> intermetallic nanoparticles (NPs) on SiO<subscript>2</subscript>/CeO<subscript>2</subscript>@SiO<subscript>2</subscript> composites were located either on SiO<subscript>2</subscript> or on CeO<subscript>2</subscript>@SiO<subscript>2</subscript>, thereby varying the average distance (intimacy) between metal sites and CeO<subscript>x</subscript> sites from "closest" to "nanoscale". The catalytic performance of these catalysts was compared to dual-bed mixtures of Pt<subscript>1</subscript>Sn<subscript>1</subscript>@SiO<subscript>2</subscript> and CeO<subscript>2</subscript>@SiO<subscript>2</subscript> powders, which provided a "milliscale" distance between sites. Several beneficial effects on the catalytic performance of CO<subscript>2</subscript>-assisted oxidative dehydrogenation of C<subscript>5</subscript>-paraffins were observed when Pt<subscript>1</subscript>Sn<subscript>1</subscript> nanoparticles were located on SiO<subscript>2</subscript> in nanoscale proximity to the CeO<subscript>2</subscript> sites, as opposed to Pt and Sn species located on CeO<subscript>2</subscript>@SiO<subscript>2</subscript> with the closest proximity and milliscale intimacy between Pt<subscript>1</subscript>Sn<subscript>1</subscript> and CeO<subscript>2</subscript>. The former catalysts exhibited the highest C<subscript>5</subscript>-paraffin conversion of 32.8%, with a C<subscript>5</subscript> total olefin selectivity of 68.7%, while the closest-proximity sample had a lower conversion of 17.4%, with a C<subscript>5</subscript> total olefin selectivity of 20.9%. The FT-IR (Fourier transform infrared spectroscopy) spectroscopic study of the CO adsorption and X-ray photoelectron spectroscopy results revealed that the closest proximity between Pt and Ce inhibited PtSn alloy formation due to their strong interaction. However, for the nanoscale-proximity sample, neighboring CeO<subscript>2</subscript>@SiO<subscript>2</subscript> did not disturb Pt<subscript>1</subscript>Sn<subscript>1</subscript> intermetallic formation. This strategy can be applied to other CO<subscript>2</subscript> activation catalysts, instead of CeO<subscript>2</subscript>@SiO<subscript>2</subscript>. This paper aims to provide insights into the influence of metal–CeO<subscript>x</subscript> intimacy in bi-functional catalysts. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20734344
- Volume :
- 13
- Issue :
- 6
- Database :
- Complementary Index
- Journal :
- Catalysts (2073-4344)
- Publication Type :
- Academic Journal
- Accession number :
- 164612253
- Full Text :
- https://doi.org/10.3390/catal13060933