Identification of a Pt3Co Surface Intermetallic Alloy in Pt–Co Propane Dehydrogenation Catalysts

Cesar, Laryssa Goncalves; Yang, Ce; Lu, Zheng; Ren, Yang; Zhang, Guanghui; Miller, Jeffrey T.

doi:10.1021/acscatal.9b00549

Title: Identification of a Pt₃Co Surface Intermetallic Alloy in Pt–Co Propane Dehydrogenation Catalysts

Journal Article · Wed Apr 24 00:00:00 EDT 2019 · ACS Catalysis

DOI:https://doi.org/10.1021/acscatal.9b00549· OSTI ID:1559887

^[1]; Yang, Ce ^[2]; Lu, Zheng ^[3]; Ren, Yang ^[4];

^[5];

^[1]

Purdue Univ., West Lafayette, IN (United States). School of Chemical Engineering
Argonne National Lab. (ANL), Argonne, IL (United States). Chemical Sciences and Engineering Division; NOVA Chemicals Center for Applied Research, Calgary, Alberta (Canada)
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). School of Chemical Engineering; Dalian Univ. of Technology, Dalian, Liaoning (China)

Bimetallic Pt-Co nanoparticles (NPs) were prepared and characterized by scanning transmission electron microscopy, in situ X-ray absorption spectroscopy, in situ synchrotron X-ray diffraction, and catalytic conversion for propane dehydrogenation with and without added H-2. In addition, the surface extended X-ray absorption fine structure (EXAFS) obtained by fitting the difference spectrum between the fully reduced and room-temperature-oxidized catalysts suggest that the surface structure remains Pt₃Co, although the core changes from Pt to Pt₃Co and to PtCo. At low Co loading, the bimetallic nanoparticles form a Pt3Co intermetallic surface alloy with Pt-rich core. With increasing Co loading, a full alloy forms where both the surface and NP compositions are Pt₃Co. A further increase in Co loading leads to a Co-rich NP core, likely PtCo, with a surface of Pt₃Co. Although Pt-Co intermetallic alloys form two different phases and several morphologies, the surface structures are similar in all catalysts. Although both monometallic Pt and Co are active for alkane dehydrogenation, all bimetallic Pt-Co catalysts are significantly more olefin selective than either single metal. The turnover rates of the bimetallic catalysts indicate that Pt is the active atom with little contribution from Co atoms. The high olefin selectivity is suggested to be due to Co acting as a less active structural promoter to break up large Pt ensembles in bimetallic NPs.

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

Sponsoring Organization:: USDOE Office of Science - Office of Basic Energy Sciences - Scientific User Facilities Division

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1559887

Journal Information:: ACS Catalysis, Vol. 9, Issue 6; ISSN 2155-5435

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 94 works

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Title: Identification of a Pt₃Co Surface Intermetallic Alloy in Pt–Co Propane Dehydrogenation Catalysts