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Title: Catalytic oxidation of ethanol and acetaldehyde in supercritical carbon dioxide

Abstract

Supercritical fluid (SCF) extraction has been receiving increasing attention for the remediation of environmental matrices contaminated with organic compounds. Catalytic oxidation of ethanol and acetaldehyde over a 4.45% Pt/TiO{sub 2} catalyst in supercritical carbon dioxide was studied in a 1/2 in. fixed bed reactor. Experiments for ethanol oxidation were performed at temperatures from 423 to 573 K and at a pressure of 8.96 MPa with a 5:1 molar ratio of oxygen to ethanol in the feed. Acetaldehyde oxidation was performed at temperatures from 423 to 548 K and at 8.96 MPa with an approximate 4.7:1 molar ratio of oxygen to acetaldehyde in the feed. In addition to CO{sub 2}, the complete oxidation product, acetaldehyde and trace amounts of CO were generated during ethanol oxidation, while a trace amount of CO was the only partial oxidation product during acetaldehyde oxidation. A parallel and consecutive reaction mechanism was postulated for ethanol oxidation, whereas dissociative adsorption of acetaldehyde on the catalyst surface and surface reaction rate control were postulated for acetaldehyde oxidation. The kinetic parameters in the rate expressions based on the mechanisms were obtained by fitting the experimental data with the results of the model calculation. The models were used to predictmore » the conversion and yield for ethanol oxidation and acetaldehyde oxidation.« less

Authors:
;  [1]
  1. Texas A and M Univ., College Station, TX (United States). Dept. of Chemical Engineering
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
178414
Resource Type:
Journal Article
Journal Name:
Industrial and Engineering Chemistry Research
Additional Journal Information:
Journal Volume: 34; Journal Issue: 5; Other Information: PBD: May 1995
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; SOILS; REMEDIAL ACTION; ETHANOL; OXIDATION; SUPERCRITICAL GAS EXTRACTION; ACETALDEHYDE; PLATINUM; TITANIUM OXIDES; CATALYTIC EFFECTS; BENCH-SCALE EXPERIMENTS; CARBON MONOXIDE; MATHEMATICAL MODELS; EFFICIENCY

Citation Formats

Zhou, L, and Akgerman, A. Catalytic oxidation of ethanol and acetaldehyde in supercritical carbon dioxide. United States: N. p., 1995. Web. doi:10.1021/ie00044a011.
Zhou, L, & Akgerman, A. Catalytic oxidation of ethanol and acetaldehyde in supercritical carbon dioxide. United States. doi:10.1021/ie00044a011.
Zhou, L, and Akgerman, A. Mon . "Catalytic oxidation of ethanol and acetaldehyde in supercritical carbon dioxide". United States. doi:10.1021/ie00044a011.
@article{osti_178414,
title = {Catalytic oxidation of ethanol and acetaldehyde in supercritical carbon dioxide},
author = {Zhou, L and Akgerman, A},
abstractNote = {Supercritical fluid (SCF) extraction has been receiving increasing attention for the remediation of environmental matrices contaminated with organic compounds. Catalytic oxidation of ethanol and acetaldehyde over a 4.45% Pt/TiO{sub 2} catalyst in supercritical carbon dioxide was studied in a 1/2 in. fixed bed reactor. Experiments for ethanol oxidation were performed at temperatures from 423 to 573 K and at a pressure of 8.96 MPa with a 5:1 molar ratio of oxygen to ethanol in the feed. Acetaldehyde oxidation was performed at temperatures from 423 to 548 K and at 8.96 MPa with an approximate 4.7:1 molar ratio of oxygen to acetaldehyde in the feed. In addition to CO{sub 2}, the complete oxidation product, acetaldehyde and trace amounts of CO were generated during ethanol oxidation, while a trace amount of CO was the only partial oxidation product during acetaldehyde oxidation. A parallel and consecutive reaction mechanism was postulated for ethanol oxidation, whereas dissociative adsorption of acetaldehyde on the catalyst surface and surface reaction rate control were postulated for acetaldehyde oxidation. The kinetic parameters in the rate expressions based on the mechanisms were obtained by fitting the experimental data with the results of the model calculation. The models were used to predict the conversion and yield for ethanol oxidation and acetaldehyde oxidation.},
doi = {10.1021/ie00044a011},
journal = {Industrial and Engineering Chemistry Research},
number = 5,
volume = 34,
place = {United States},
year = {1995},
month = {5}
}