skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: ED-XAS Data Reveal In-situ Time-Resolved Adsorbate Coverage on Supported Molybdenum Oxide Catalysts during Propane Dehydrogenation

Abstract

Energy-Dispersive X-ray Absorption Spectroscopy (ED-XAS) data combined with UV/Vis, Raman, and mass spectrometry data on alumina- and silica-supported molybdenum oxide catalysts under propane dehydrogenation conditions have been previously reported. A novel {delta}{mu} adsorbate isolation technique was applied here to the time-resolved (0.1 min) Mo K-edge ED-XAS data by taking the difference of absorption, {mu}, at t>1 against the initial time, t=0. Further, full multiple scattering calculations using the FEFF 8.0 code are performed to interpret the {delta}{mu} signatures. The resulting difference spectra and interpretation provide real time propane coverage and O depletion at the MoOn surface. The propane coverage is seen to correlate with the propene and/or coke production, with the maximum coke formation occurring when the propane coverage is the largest. Combined, these data give unprecedented insight into the complicated dynamics for propane dehydrogenation.

Authors:
;  [1]; ;  [2]
  1. Department of Chemistry, George Washington University, Washington D.C. 20052 (United States)
  2. Inorganic Chemistry and Catalysis, Dept. of Chem., Utrecht University, Sorbonnelaan 16, 3584 CA Utrecht (Netherlands)
Publication Date:
OSTI Identifier:
21054697
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 882; Journal Issue: 1; Conference: XAFS13: 13. international conference on X-ray absorption fine structure, Stanford, CA (United States), 9-14 Jul 2006; Other Information: DOI: 10.1063/1.2644610; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ABSORPTION SPECTROSCOPY; ADSORPTION; ALUMINIUM OXIDES; CATALYSIS; CATALYSTS; COMPUTERIZED SIMULATION; DEHYDROGENATION; F CODES; MASS SPECTROSCOPY; MOLYBDENUM OXIDES; MULTIPLE SCATTERING; PROPANE; PROPYLENE; RAMAN SPECTROSCOPY; SILICON COMPOUNDS; SURFACES; TIME RESOLUTION; X-RAY SPECTRA; X-RAY SPECTROSCOPY

Citation Formats

Ramaker, David, Gatewood, Daniel, Beale, Andrew M., and Weckhuysen, Bert M.. ED-XAS Data Reveal In-situ Time-Resolved Adsorbate Coverage on Supported Molybdenum Oxide Catalysts during Propane Dehydrogenation. United States: N. p., 2007. Web. doi:10.1063/1.2644610.
Ramaker, David, Gatewood, Daniel, Beale, Andrew M., & Weckhuysen, Bert M.. ED-XAS Data Reveal In-situ Time-Resolved Adsorbate Coverage on Supported Molybdenum Oxide Catalysts during Propane Dehydrogenation. United States. doi:10.1063/1.2644610.
Ramaker, David, Gatewood, Daniel, Beale, Andrew M., and Weckhuysen, Bert M.. Fri . "ED-XAS Data Reveal In-situ Time-Resolved Adsorbate Coverage on Supported Molybdenum Oxide Catalysts during Propane Dehydrogenation". United States. doi:10.1063/1.2644610.
@article{osti_21054697,
title = {ED-XAS Data Reveal In-situ Time-Resolved Adsorbate Coverage on Supported Molybdenum Oxide Catalysts during Propane Dehydrogenation},
author = {Ramaker, David and Gatewood, Daniel and Beale, Andrew M. and Weckhuysen, Bert M.},
abstractNote = {Energy-Dispersive X-ray Absorption Spectroscopy (ED-XAS) data combined with UV/Vis, Raman, and mass spectrometry data on alumina- and silica-supported molybdenum oxide catalysts under propane dehydrogenation conditions have been previously reported. A novel {delta}{mu} adsorbate isolation technique was applied here to the time-resolved (0.1 min) Mo K-edge ED-XAS data by taking the difference of absorption, {mu}, at t>1 against the initial time, t=0. Further, full multiple scattering calculations using the FEFF 8.0 code are performed to interpret the {delta}{mu} signatures. The resulting difference spectra and interpretation provide real time propane coverage and O depletion at the MoOn surface. The propane coverage is seen to correlate with the propene and/or coke production, with the maximum coke formation occurring when the propane coverage is the largest. Combined, these data give unprecedented insight into the complicated dynamics for propane dehydrogenation.},
doi = {10.1063/1.2644610},
journal = {AIP Conference Proceedings},
number = 1,
volume = 882,
place = {United States},
year = {Fri Feb 02 00:00:00 EST 2007},
month = {Fri Feb 02 00:00:00 EST 2007}
}