Structure and reactivity of Pt–In intermetallic alloy nanoparticles: Highly selective catalysts for ethane dehydrogenation

Wegener, Evan C.; Wu, Zhenwei; Tseng, Han-Ting; Gallagher, James R.; Ren, Yang; Diaz, Rosa E.; Ribeiro, Fabio H.; Miller, Jeffrey T.

doi:10.1016/j.cattod.2017.03.054

Structure and reactivity of Pt–In intermetallic alloy nanoparticles: Highly selective catalysts for ethane dehydrogenation

Journal Article · Sat Apr 15 04:00:00 EDT 2017 · Catalysis Today

DOI:https://doi.org/10.1016/j.cattod.2017.03.054· OSTI ID:1462709

Wegener, Evan C. ^[1]; Wu, Zhenwei ^[1]; Tseng, Han-Ting ^[1]; Gallagher, James R. ^[2]; Ren, Yang ^[3]; Diaz, Rosa E. ^[4]; Ribeiro, Fabio H. ^[1]; Miller, Jeffrey T. ^[1]

Purdue Univ., West Lafayette, IN (United States). Chemical Engineering
Argonne National Lab. (ANL), Argonne, IL (United States). Chemical Sciences and Engineering Division
Argonne National Lab. (ANL), Argonne, IL (United States). X-ray Science Division
Purdue Univ., West Lafayette, IN (United States). Birck Nanotechnology Center

The structure of silica supported Pt and Pt-In bimetallic catalysts with nominal In: Pt atomic ratios of 0.7 and 1.4 were here determined by in situ synchrotron XAS and XRD. It was seen that the addition of In led to the formation of two different intermetallic alloy phases. At an In: Pt ratio of 0.7 the Pt₃In phase with a Cu₃Au structure was formed. When the ratio was increased to 1.4 a shell of PtIn₂ having a CaF₂ structure formed around a core of Pt₃In. The catalysts were tested for ethane dehydrogenation at 600° to determine the effect of alloying on ethylene selectivity and turnover rate (TOR). The monometallic Pt catalysts was 73% selective for ethylene and had an initial TOR of 0.7 s^-1. Both alloy catalysts were approximate to 100% selective for dehydrogenation and had higher initial TOR, 2.8 s^-1 and 1.6 s^-1 for In: Pt ratio of 0.7 and 1.4, respectively. The increase in selectivity is attributed to the elimination of large Pt ensembles resulting from geometric changes to the catalyst surface upon alloying. Electronic changes due to the formation of Pt-In bonds are thought to be responsible for the increases in TOR in the alloy catalysts.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1462709

Alternate ID(s):: OSTI ID: 1550502

Journal Information:: Catalysis Today, Journal Name: Catalysis Today Journal Issue: C Vol. 299; ISSN 0920-5861

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
77 NANOSCIENCE AND NANOTECHNOLOGY
Dehydrogenation selectivity
EXAFS of PtIn bimetallic nanoparticles
Ethane dehydrogenation
Geometric effects in bimetallic alloys
PtIn nanoparticles
Synchrotron XRD of nanoparticles

Structure and reactivity of Pt–In intermetallic alloy nanoparticles: Highly selective catalysts for ethane dehydrogenation

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