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Promotion of Pd nanoparticles by Fe and formation of a Pd3Fe intermetallic alloy for propane dehydrogenation

Journal Article · · Catalysis Today
 [1];  [2];  [2];  [3];  [3];  [3];  [1];  [1];  [4];  [1];  [5]
  1. Argonne National Lab. (ANL), Argonne, IL (United States). Chemical Sciences and Engineering Division
  2. Purdue Univ., West Lafayette, IN (United States). Davidson School of Chemical Engineering
  3. Argonne National Lab. (ANL), Argonne, IL (United States). Center for Nanoscale Materials
  4. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
  5. Argonne National Lab. (ANL), Argonne, IL (United States). Chemical Sciences and Engineering Division; Purdue Univ., West Lafayette, IN (United States). Davidson School of Chemical Engineering
In this study, silica supported Pd (~2 nm), Pd3Fe (~2 nm) and Pd3Fe_large (~12 nm) catalysts were synthesized and tested for propane dehydrogenation at 510 °C. At the 10% conversion, Pd and Pd3Fe catalysts exhibited propylene selectivity of 45% and 94%, respectively. Moreover, the latter showed a turnover rate (TOR) of 0.2 s-1, which is five times higher than that of the Pd catalyst (0.04 s-1). Pd K edge XAS, XRD, and CO adsorbed IR were used to characterize the geometric structure of the catalysts. By combined comparison of XRD and XAS spectra of Pd3Fe and Pd3Fe_large catalysts, we successfully identified the crystalline phase in the 2 nm Pd3Fe catalyst. The CO adsorbed IR suggests that the formation of Pd3Fe breaks the ensemble of Pd, which is responsible for the increase of selectivity. The Pd L edge XAS was used to characterize the electronic structure of the catalysts. The Pd3Fe catalyst exhibits an increase of the edge energy compared with the Pd catalyst, which indicates the change of d-band structure in the bimetallic catalyst. The change in the electronic structure is likely the reason for the increase in TOR.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1650346
Alternate ID(s):
OSTI ID: 1874719
Journal Information:
Catalysis Today, Journal Name: Catalysis Today Vol. 323; ISSN 0920-5861
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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