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Title: Reducilbility of rhenium in Pt-Re/Al{sub 2}O{sub 3} reforming catalysts a temperature programmed reduction-X-ray absorption near-edge structure study

Abstract

Temperature programmed reduction (TPR) experiments were performed on Pt-Re/Al{sub 2}O{sub 3} catalysts in an X-ray absorption near-edge structure (XANES) apparatus to assess the effect of different metal loading and different Re/Pt ratios on the reducibility of Re. It was found that these two variables affect the reduction kinetics of Re, but they do not seem to affect the final oxidation state of the Re metal. The performance of these catalysts under reforming conditions appears to correlate with the mode of metal particle generation of the samples, as monitored by the TPR-XANES technique. Catalyst performance data have been generated in a laboratory bench scale unit as well as in a pilot plant unit. The relative binding energy (BE) of core p electrons of Re in the catalysts with respect to an appropriate internal reference was monitored at both the L{sub II} and L{sub III} edges as a function of the reduction temperature. Such a comparison served as a test to confirm that the kinetics of Re reduction as monitored by the TPR-XANES technique is independent of the edge chosen. The authors were unable to obtain a precise two-shell fitting of the Pt-Re by EXAFS. This type of fitting is complicated bymore » backscattering by oxygen in the alumina lattice after reduction, providing too large a number of independent parameters for a reliable fitting. 13 refs., 7 figs., 6 tabs.« less

Authors:
; ;  [1]
  1. Yale Univ., New Haven, CT (United States); and others
Publication Date:
OSTI Identifier:
111017
Resource Type:
Journal Article
Journal Name:
Journal of Catalysis
Additional Journal Information:
Journal Volume: 154; Journal Issue: 2; Other Information: PBD: Jul 1995
Country of Publication:
United States
Language:
English
Subject:
40 CHEMISTRY; ALUMINIUM OXIDES; STRUCTURAL CHEMICAL ANALYSIS; RHENIUM; REDUCTION; PLATINUM; TEMPERATURE DEPENDENCE; CHEMICAL REACTION KINETICS; CATALYSTS; X-RAY SPECTROSCOPY; CATALYTIC REFORMING; ABSORPTION SPECTROSCOPY; BENCH-SCALE EXPERIMENTS

Citation Formats

Michel, C G, Bambrick, W E, and Ebel, R H. Reducilbility of rhenium in Pt-Re/Al{sub 2}O{sub 3} reforming catalysts a temperature programmed reduction-X-ray absorption near-edge structure study. United States: N. p., 1995. Web. doi:10.1006/jcat.1995.1164.
Michel, C G, Bambrick, W E, & Ebel, R H. Reducilbility of rhenium in Pt-Re/Al{sub 2}O{sub 3} reforming catalysts a temperature programmed reduction-X-ray absorption near-edge structure study. United States. https://doi.org/10.1006/jcat.1995.1164
Michel, C G, Bambrick, W E, and Ebel, R H. Sat . "Reducilbility of rhenium in Pt-Re/Al{sub 2}O{sub 3} reforming catalysts a temperature programmed reduction-X-ray absorption near-edge structure study". United States. https://doi.org/10.1006/jcat.1995.1164.
@article{osti_111017,
title = {Reducilbility of rhenium in Pt-Re/Al{sub 2}O{sub 3} reforming catalysts a temperature programmed reduction-X-ray absorption near-edge structure study},
author = {Michel, C G and Bambrick, W E and Ebel, R H},
abstractNote = {Temperature programmed reduction (TPR) experiments were performed on Pt-Re/Al{sub 2}O{sub 3} catalysts in an X-ray absorption near-edge structure (XANES) apparatus to assess the effect of different metal loading and different Re/Pt ratios on the reducibility of Re. It was found that these two variables affect the reduction kinetics of Re, but they do not seem to affect the final oxidation state of the Re metal. The performance of these catalysts under reforming conditions appears to correlate with the mode of metal particle generation of the samples, as monitored by the TPR-XANES technique. Catalyst performance data have been generated in a laboratory bench scale unit as well as in a pilot plant unit. The relative binding energy (BE) of core p electrons of Re in the catalysts with respect to an appropriate internal reference was monitored at both the L{sub II} and L{sub III} edges as a function of the reduction temperature. Such a comparison served as a test to confirm that the kinetics of Re reduction as monitored by the TPR-XANES technique is independent of the edge chosen. The authors were unable to obtain a precise two-shell fitting of the Pt-Re by EXAFS. This type of fitting is complicated by backscattering by oxygen in the alumina lattice after reduction, providing too large a number of independent parameters for a reliable fitting. 13 refs., 7 figs., 6 tabs.},
doi = {10.1006/jcat.1995.1164},
url = {https://www.osti.gov/biblio/111017}, journal = {Journal of Catalysis},
number = 2,
volume = 154,
place = {United States},
year = {1995},
month = {7}
}