Identification of the structure of the Bi promoted Pt non-oxidative coupling of methane catalyst: a nanoscale Pt3Bi intermetallic alloy
Abstract
Recently, stable non-oxidative conversion of methane (NOCM) for up to 8 h with a C2 selectivity greater than 90% has been reported over Pt–Bi/ZSM-5 at moderate temperatures (600–700 °C). In this study, we demonstrate that the structure of the bimetallic nanoparticles on Pt–Bi/ZSM-5 catalyst is similar to Pt–Bi/SiO2. EXAFS indicates the formation of Pt-rich bimetallic Pt–Bi nanoparticles with Pt–Bi bond distance of 2.80 Å. The XRD spectra (on SiO2) are consistent with cubic, intermetallic surface Pt3Bi phase on a Pt core. The Pt3Bi structure is not known in the thermodynamic phase diagram. In all catalysts, only a small fraction of Bi alloys with Pt. At high Bi loadings, excess Bi reduces at high temperature, covering the catalytic surface leading to a loss in activity. At lower Bi loadings with little excess Bi, the Pt3Bi surface is effective for non-oxidative coupling of CH4 (on ZSM-5) and propane dehydrogenation (on SiO2).
- Authors:
-
[1];
[1];
[2];
[1];
[1]
- Purdue Univ., West Lafayette, IN (United States)
- Chinese Academy of Sciences (CAS), Dalian (China)
- Publication Date:
- Research Org.:
- Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Sponsoring Org.:
- National Science Foundation (NSF); Fundamental Research Funds for the Central Universities; USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1601880
- Grant/Contract Number:
- AC02-06CH11357
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Catalysis Science and Technology
- Additional Journal Information:
- Journal Volume: 9; Journal Issue: 6; Journal ID: ISSN 2044-4753
- Publisher:
- Royal Society of Chemistry
- Country of Publication:
- United States
- Language:
- ENGLISH
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Citation Formats
Zhu Chen, Johnny, Wu, Zhenwei, Zhang, Xiaoben, Choi, Slgi, Xiao, Yang, Varma, Arvind, Liu, Wei, Zhang, Guanghui, and Miller, Jeffrey T. Identification of the structure of the Bi promoted Pt non-oxidative coupling of methane catalyst: a nanoscale Pt3Bi intermetallic alloy. United States: N. p., 2019.
Web. doi:10.1039/c8cy02171f.
Zhu Chen, Johnny, Wu, Zhenwei, Zhang, Xiaoben, Choi, Slgi, Xiao, Yang, Varma, Arvind, Liu, Wei, Zhang, Guanghui, & Miller, Jeffrey T. Identification of the structure of the Bi promoted Pt non-oxidative coupling of methane catalyst: a nanoscale Pt3Bi intermetallic alloy. United States. https://doi.org/10.1039/c8cy02171f
Zhu Chen, Johnny, Wu, Zhenwei, Zhang, Xiaoben, Choi, Slgi, Xiao, Yang, Varma, Arvind, Liu, Wei, Zhang, Guanghui, and Miller, Jeffrey T. Tue .
"Identification of the structure of the Bi promoted Pt non-oxidative coupling of methane catalyst: a nanoscale Pt3Bi intermetallic alloy". United States. https://doi.org/10.1039/c8cy02171f. https://www.osti.gov/servlets/purl/1601880.
@article{osti_1601880,
title = {Identification of the structure of the Bi promoted Pt non-oxidative coupling of methane catalyst: a nanoscale Pt3Bi intermetallic alloy},
author = {Zhu Chen, Johnny and Wu, Zhenwei and Zhang, Xiaoben and Choi, Slgi and Xiao, Yang and Varma, Arvind and Liu, Wei and Zhang, Guanghui and Miller, Jeffrey T.},
abstractNote = {Recently, stable non-oxidative conversion of methane (NOCM) for up to 8 h with a C2 selectivity greater than 90% has been reported over Pt–Bi/ZSM-5 at moderate temperatures (600–700 °C). In this study, we demonstrate that the structure of the bimetallic nanoparticles on Pt–Bi/ZSM-5 catalyst is similar to Pt–Bi/SiO2. EXAFS indicates the formation of Pt-rich bimetallic Pt–Bi nanoparticles with Pt–Bi bond distance of 2.80 Å. The XRD spectra (on SiO2) are consistent with cubic, intermetallic surface Pt3Bi phase on a Pt core. The Pt3Bi structure is not known in the thermodynamic phase diagram. In all catalysts, only a small fraction of Bi alloys with Pt. At high Bi loadings, excess Bi reduces at high temperature, covering the catalytic surface leading to a loss in activity. At lower Bi loadings with little excess Bi, the Pt3Bi surface is effective for non-oxidative coupling of CH4 (on ZSM-5) and propane dehydrogenation (on SiO2).},
doi = {10.1039/c8cy02171f},
journal = {Catalysis Science and Technology},
number = 6,
volume = 9,
place = {United States},
year = {Tue Jan 15 00:00:00 EST 2019},
month = {Tue Jan 15 00:00:00 EST 2019}
}
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