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Thermal Unequilibrium of PdSn Intermetallic Nanocatalysts: From In Situ Tailored Synthesis to Unexpected Hydrogenation Selectivity

Journal Article · · Angewandte Chemie (International Edition)
 [1];  [2];  [3];  [1];  [4];  [5];  [1];  [6];  [1];  [1];  [1];  [3];  [2];  [7]
  1. Iowa State Univ., Ames, IA (United States)
  2. Univ. of Oklahoma, Norman, OK (United States)
  3. Univ. of Illinois at Urbana-Champaign, IL (United States)
  4. Univ. of Central Florida, Orlando, FL (United States). Catalysis Cluster for Renewable Energy and Chemical Transformations (REACT), NanoScience Technology Center (NSTC)
  5. Ames Lab., Ames, IA (United States)
  6. Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States). Materials Analysis and Research Lab.
  7. Ames Lab., and Iowa State Univ., Ames, IA (United States)

Effective control on chemoselectivity in the catalytic hydrogenation of C=O over C=C bonds is uncommon with Pd-based catalysts because of the favored adsorption of C=C bonds on Pd surface. Here we report a unique orthorhombic PdSn intermetallic phase with unprecedented chemoselectivity toward C=O hydrogenation. We observed the formation and metastability of this PdSn phase in situ. During a natural cooling process, the PdSn nanoparticles readily revert to the favored Pd3Sn2 phase. Instead, using a thermal quenching method, we prepared a pure-phase PdSn nanocatalyst. Furthermore, PdSn shows an >96% selectivity toward hydrogenating C=O bonds of various α,β-unsaturated aldehydes, highest in reported Pd-based catalysts. Further study suggests that efficient quenching prevents the reversion from PdSn- to Pd3Sn2-structured surface, the key to the desired catalytic performance. Density functional theory calculations and analysis of reaction kinetics provide an explanation for the observed high selectivity.

Research Organization:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Organization:
USDOE; National Science Foundation (NSF)
Grant/Contract Number:
AC02-07CH11358; AC02-07CH11358; AC02-07CH11358; AC02-07CH11358; AC02-07CH11358; AC02-07CH11358; AC02-07CH11358
OSTI ID:
1817653
Alternate ID(s):
OSTI ID: 1808608
OSTI ID: 1814768
OSTI ID: 1814797
OSTI ID: 1818354
Report Number(s):
IS--J 10,555
Journal Information:
Angewandte Chemie (International Edition), Journal Name: Angewandte Chemie (International Edition) Journal Issue: 33 Vol. 60; ISSN 1433-7851
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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