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Title: EXAFS study of zeolite-supported Rh catalysts for methanol carbonylation

Abstract

In order to determine the structural basis for the activity of transition metals exchanged into zeolite frameworks, a series of extended X-ray absorption fine structure (EXAFS) measurements have been made. In the particular case of Rh, it has been shown that solutions of (RhCl(NH/sub 3/)/sub 5/)Cl/sub 2/ exchanged with Na-X form a highly active catalyst (RhA) for the carbonylation of methanol when used with an organic iodide promoter. On the other hand, systems prepared from RhCl/sub 3/ are far less active (RhC). EXAFS spectroscopy from the Rh K-edge has been used to follow the fate of the Rh species for the two preparation techniques from the initial impregnation through the catalyst calcination to the final activation with the promoter. Differences in structure are readily apparent at each stage of the catalyst preparation. 17 references, 5 figures, 6 tables.

Authors:
; ;
Publication Date:
Research Org.:
Shell Development Co., Houston, TX
OSTI Identifier:
6196237
Resource Type:
Journal Article
Resource Relation:
Journal Name: J. Catal.; (United States); Journal Volume: 87:2
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; CATALYSTS; CHEMICAL PREPARATION; METHANOL; CARBONYLATION; RHODIUM; CATALYTIC EFFECTS; RHODIUM CHLORIDES; ABSORPTION SPECTROSCOPY; X-RAY SPECTROSCOPY; ZEOLITES; FINE STRUCTURE; IMPREGNATION; ABSORPTION SPECTRA; CATALYSIS; EXPERIMENTAL DATA; HIGH TEMPERATURE; REACTION INTERMEDIATES; SODIUM COMPOUNDS; X-RAY SPECTRA; ALCOHOLS; ALKALI METAL COMPOUNDS; CHEMICAL REACTIONS; CHLORIDES; CHLORINE COMPOUNDS; DATA; ELEMENTS; HALIDES; HALOGEN COMPOUNDS; HYDROXY COMPOUNDS; INFORMATION; INORGANIC ION EXCHANGERS; ION EXCHANGE MATERIALS; MATERIALS; METALS; MINERALS; NUMERICAL DATA; ORGANIC COMPOUNDS; PLATINUM METALS; REFRACTORY METAL COMPOUNDS; RHODIUM COMPOUNDS; SPECTRA; SPECTROSCOPY; SYNTHESIS; TRANSITION ELEMENT COMPOUNDS; TRANSITION ELEMENTS; 020400* - Petroleum- Processing; 400104 - Spectral Procedures- (-1987)

Citation Formats

Denley, D.R., Raymond, R.H., and Tang, S.C. EXAFS study of zeolite-supported Rh catalysts for methanol carbonylation. United States: N. p., 1984. Web. doi:10.1016/0021-9517(84)90201-X.
Denley, D.R., Raymond, R.H., & Tang, S.C. EXAFS study of zeolite-supported Rh catalysts for methanol carbonylation. United States. doi:10.1016/0021-9517(84)90201-X.
Denley, D.R., Raymond, R.H., and Tang, S.C. Fri . "EXAFS study of zeolite-supported Rh catalysts for methanol carbonylation". United States. doi:10.1016/0021-9517(84)90201-X.
@article{osti_6196237,
title = {EXAFS study of zeolite-supported Rh catalysts for methanol carbonylation},
author = {Denley, D.R. and Raymond, R.H. and Tang, S.C.},
abstractNote = {In order to determine the structural basis for the activity of transition metals exchanged into zeolite frameworks, a series of extended X-ray absorption fine structure (EXAFS) measurements have been made. In the particular case of Rh, it has been shown that solutions of (RhCl(NH/sub 3/)/sub 5/)Cl/sub 2/ exchanged with Na-X form a highly active catalyst (RhA) for the carbonylation of methanol when used with an organic iodide promoter. On the other hand, systems prepared from RhCl/sub 3/ are far less active (RhC). EXAFS spectroscopy from the Rh K-edge has been used to follow the fate of the Rh species for the two preparation techniques from the initial impregnation through the catalyst calcination to the final activation with the promoter. Differences in structure are readily apparent at each stage of the catalyst preparation. 17 references, 5 figures, 6 tables.},
doi = {10.1016/0021-9517(84)90201-X},
journal = {J. Catal.; (United States)},
number = ,
volume = 87:2,
place = {United States},
year = {Fri Jun 01 00:00:00 EDT 1984},
month = {Fri Jun 01 00:00:00 EDT 1984}
}