Supported Pt Nanoparticles on Mesoporous Titania for Selective Hydrogenation of Phenylacetylene
Journal Article
·
· Frontiers in Chemistry
- Nanjing Normal Univ., Nanjing (China). Jiangsu Key Lab. of New Power Batteries, Collaborative Innovation Center of Biomedical Functional Materials; Univ. of Connecticut, Mansfield, CT (United States); UCONN
- Univ. of Connecticut, Mansfield, CT (United States)
- Univ. of Connecticut, Mansfield, CT (United States). Inst. of Materials Science
- Nanjing Normal Univ., Nanjing (China). Jiangsu Key Lab. of New Power Batteries, Collaborative Innovation Center of Biomedical Functional Materials
Semi-hydrogenation of alkynes to alkenes is one of the most important industrial reactions. However, it remains technically challenging to obtain high alkene selectivity especially at a high alkyne conversion because of kinetically favorable over hydrogenation. In this contribution, we show that supported ultrasmall Pt nanoparticles (2.5 nm) on mesoporous TiO2 (Pt@mTiO2) remarkably improve catalytic performance toward semi-hydrogenation of phenylacetylene. Pt@mTiO2 is prepared by co-assembly of Pt and Ti precursors with silica colloidal templates via an evaporation-induced self-assembly process, followed by further calcination for thermal decomposition of Pt precursors and crystallization of mTiO2 simultaneously. As-resultant Pt@mTiO2 discloses a high hydrogenation activity of phenylacetylene, which is 2.5 times higher than that of commercial Pt/C. More interestingly, styrene selectivity over Pt@mTiO2 remains 100% in a wide phenylacetylene conversion window (20–75%). The styrene selectivity is >80% even at 100% phenylacetylene conversion while that of the commercial Pt/C is 0%. The remarkable styrene selectivity of the Pt@mTiO2 is derived from the weakened styrene adsorption strength on the atop Pt sites as observed by diffuse reflectance infrared Fourier transform spectroscopy with CO as a probe molecule (CO-DRIFTS). Our strategy provides a new avenue for promoting alkyne to alkene transformation in the kinetically unfavorable region through novel catalyst preparation.
- Research Organization:
- Univ. of Connecticut, Storrs, CT (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division
- Grant/Contract Number:
- FG02-86ER13622
- OSTI ID:
- 1775272
- Alternate ID(s):
- OSTI ID: 1837952
OSTI ID: 1775604
- Journal Information:
- Frontiers in Chemistry, Journal Name: Frontiers in Chemistry Vol. 8; ISSN 2296-2646
- Publisher:
- Frontiers Research FoundationCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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OSTI ID:98966