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Supported Pt Nanoparticles on Mesoporous Titania for Selective Hydrogenation of Phenylacetylene

Journal Article · · Frontiers in Chemistry
 [1];  [2];  [3];  [3];  [3];  [4]
  1. 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
  2. Univ. of Connecticut, Mansfield, CT (United States)
  3. Univ. of Connecticut, Mansfield, CT (United States). Inst. of Materials Science
  4. 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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  • Domínguez-Domínguez, Sonia; Berenguer-Murcia, Ángel; Pradhan, Bhabendra K.
  • The Journal of Physical Chemistry C, Vol. 112, Issue 10 https://doi.org/10.1021/jp710693u
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