Issue 6, 2019

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 show 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).

Graphical abstract: Identification of the structure of the Bi promoted Pt non-oxidative coupling of methane catalyst: a nanoscale Pt3Bi intermetallic alloy

Supplementary files

Article information

Article type
Paper
Submitted
26 Oct 2018
Accepted
13 Jan 2019
First published
15 Jan 2019

Catal. Sci. Technol., 2019,9, 1349-1356

Author version available

Identification of the structure of the Bi promoted Pt non-oxidative coupling of methane catalyst: a nanoscale Pt3Bi intermetallic alloy

J. Zhu Chen, Z. Wu, X. Zhang, S. Choi, Y. Xiao, A. Varma, W. Liu, G. Zhang and J. T. Miller, Catal. Sci. Technol., 2019, 9, 1349 DOI: 10.1039/C8CY02171F

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