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Title: Citral Hydrogenation over Dilute Alloy Catalysts

Journal Article · · ChemCatChem
ORCiD logo [1];  [2];  [3];  [4]; ORCiD logo [2]; ORCiD logo [2]
  1. Georgia Institute of Technology, Atlanta, GA (United States); West Virginia Univ., Morgantown, WV (United States)
  2. Georgia Institute of Technology, Atlanta, GA (United States)
  3. Georgia Institute of Technology, Atlanta, GA (United States); Evonik Industries, Trexlerton, PA (United States)
  4. Georgia Institute of Technology, Atlanta, GA (United States); Hongik University, Seoul (Korea, Republic of)

Dilute alloy CuPt and NiPt catalysts are studied in the hydrogenation of citral, a model α,β-unsaturated aldehyde. In situ and ex situ characterization is used to demonstrate that the Pt species within these nanoparticles are well dispersed and approach a single atom alloy structure. The distribution of Pt varies between the two host metal systems; under a hydrogen environment, the nanoparticle surface and near-surface region of the NiPt nanoparticles is Pt rich, while the Pt is more uniformly distributed throughout the CuPt nanoparticles. When used for citral hydrogenation reactions, a rate enhancement is observed upon the addition of Pt to the Cu or Ni host catalysts, however this enhancement is determined to be due to the presence of additional metal and not a synergistic effect of the two metals. The Pt structure does, nonetheless, influence the observed selectivity trends. NiPt/SiO2 catalysts have high selectivity to the unsaturated aldehyde citronellal while the CuPt/SiO2 catalysts have increased selectivity to unsaturated alcohol products. Further, this increased selectivity is attributed to a combination of hydrogen dissociation over Pt sites and a decrease in size of Cu ensembles due to the presence of Pt, which favors binding and hydrogenation of C=O rather than C=C bonds.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS); Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
Sponsoring Organization:
National Science Foundation (NSF); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
Grant/Contract Number:
AC02-06CH11357; SC0012704
OSTI ID:
2423313
Journal Information:
ChemCatChem, Journal Name: ChemCatChem Journal Issue: 5 Vol. 15; ISSN 1867-3880
Publisher:
ChemPubSoc EuropeCopyright Statement
Country of Publication:
United States
Language:
English

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