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Title: Calorimetric study of vanadium pentoxide catalysts used in the reaction of ethane oxidative dehydrogenation

Abstract

Vanadium pentoxide catalysts have been studied in the partial oxidation reaction of ethane in the 723-843 K temperature range. The relationship between the acid-base properties and the catalytic behavior was investigated. The number and character of acidic sites of V{sub 2}O{sub 5} catalysts were determined by studying the adsorption of a basic molecule using microcalorimetry. The reducibility level and the evolution of the surface state, as well as the heat evolved, were studied by using a pulse method with pure ethane only. The reaction of ethane oxidative dehydrogenation was studied by a continuous flow method and the activation energies for the formation of C{sub 2}H{sub 4} and CO were calculated. The selectivity of the catalyst was interpreted in connection with the acid-base properties. The strong sites were observed to decrease rapidly with time on stream, although the catalysts were still active. Temperature-programmed reduction of V{sub 2}O{sub 5} using a TG-DSC coupling was also investigated with hydrogen, ethylene, or ethane as reducers. The different heats of reduction are given. It was observed that C{sub 2}H{sub 4} is a much more efficient reducing agent than H{sub 2} and C{sub 2}H{sub 6}. Following each reduction, reoxidation studies by oxygen were performed in themore » same equipment showing clearly different step in the reoxidation process. 20 refs., 8 figs., 1 tab.« less

Authors:
; ;  [1]
  1. Institut de Recherches sur la Catalyse, Villeurbanne (France); and others
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
255259
Resource Type:
Journal Article
Journal Name:
Journal of Physical Chemistry
Additional Journal Information:
Journal Volume: 96; Journal Issue: 5; Other Information: PBD: 5 Mar 1992
Country of Publication:
United States
Language:
English
Subject:
40 CHEMISTRY; 10 SYNTHETIC FUELS; VANADIUM OXIDES; CATALYTIC EFFECTS; ETHANE; DEHYDROGENATION; OXIDATION; CATALYSTS; CALORIMETRY; ACTIVATION ENERGY; REACTION HEAT

Citation Formats

Le Bars, J, Vedrine, J C, and Auroux, A. Calorimetric study of vanadium pentoxide catalysts used in the reaction of ethane oxidative dehydrogenation. United States: N. p., 1992. Web. doi:10.1021/j100184a035.
Le Bars, J, Vedrine, J C, & Auroux, A. Calorimetric study of vanadium pentoxide catalysts used in the reaction of ethane oxidative dehydrogenation. United States. https://doi.org/10.1021/j100184a035
Le Bars, J, Vedrine, J C, and Auroux, A. Thu . "Calorimetric study of vanadium pentoxide catalysts used in the reaction of ethane oxidative dehydrogenation". United States. https://doi.org/10.1021/j100184a035.
@article{osti_255259,
title = {Calorimetric study of vanadium pentoxide catalysts used in the reaction of ethane oxidative dehydrogenation},
author = {Le Bars, J and Vedrine, J C and Auroux, A},
abstractNote = {Vanadium pentoxide catalysts have been studied in the partial oxidation reaction of ethane in the 723-843 K temperature range. The relationship between the acid-base properties and the catalytic behavior was investigated. The number and character of acidic sites of V{sub 2}O{sub 5} catalysts were determined by studying the adsorption of a basic molecule using microcalorimetry. The reducibility level and the evolution of the surface state, as well as the heat evolved, were studied by using a pulse method with pure ethane only. The reaction of ethane oxidative dehydrogenation was studied by a continuous flow method and the activation energies for the formation of C{sub 2}H{sub 4} and CO were calculated. The selectivity of the catalyst was interpreted in connection with the acid-base properties. The strong sites were observed to decrease rapidly with time on stream, although the catalysts were still active. Temperature-programmed reduction of V{sub 2}O{sub 5} using a TG-DSC coupling was also investigated with hydrogen, ethylene, or ethane as reducers. The different heats of reduction are given. It was observed that C{sub 2}H{sub 4} is a much more efficient reducing agent than H{sub 2} and C{sub 2}H{sub 6}. Following each reduction, reoxidation studies by oxygen were performed in the same equipment showing clearly different step in the reoxidation process. 20 refs., 8 figs., 1 tab.},
doi = {10.1021/j100184a035},
url = {https://www.osti.gov/biblio/255259}, journal = {Journal of Physical Chemistry},
number = 5,
volume = 96,
place = {United States},
year = {1992},
month = {3}
}