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Oxidative and non-oxidative degradation of C1–C3 carboxylic acids over V2O5/TiO2 and MoVTeNb oxides: A comparative study

Paper ID Volume ID Publish Year Pages File Format Full-Text
40289 45849 2013 6 PDF Available
Title
Oxidative and non-oxidative degradation of C1–C3 carboxylic acids over V2O5/TiO2 and MoVTeNb oxides: A comparative study
Abstract

•Reactivity of RCOOH (R = H, CH3, C2H5) over V2O5/TiO2 and MoVTeNb oxides is compared.•MoVTeNb oxides show much lower catalytic activity in RCOOH degradation.•Acetic acid is the most resistant both under aerobic and anaerobic conditions.•The mechanistic aspects of the oxidative degradation of RCOOH are discussed.

Carboxylic acids are valuable chemical products, which can be produced efficiently by catalytic oxidation of various organic compounds using vanadium-based catalysts. Degradation resistance of carboxylic acids under applied reaction conditions is an important factor influencing selectivity of such reactions. This paper addresses the oxidative and non-oxidative gas phase degradation of formic, acetic and propionic acids over V2O5/TiO2 and MoVTeNb mixed oxides. Formic acid has been found to undergo mainly acid catalyzed decarbonylation, regardless the presence or absence of oxygen in the feed. Both acetic and propionic acids underwent oxidation (in aerobic conditions) through one-carbon degradation steps until CO and CO2 were produced. The mechanistic aspects of these transformations are discussed. The key intermediacy of 2-(hydro)peroxy carboxylic acids is suggested, based on the nature of primary reaction products. The catalytic activity of MoVTeNb mixed oxides toward oxidative and non-oxidative degradation of acetic and propionic acids appeared notably lower compared to that of V2O5/TiO2. This may be linked to the enhanced efficiency of the former catalyst in selective oxidation of organic substrates to carboxylic acids.

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Keywords
V2O5/TiO2; Mo–V–Te–Nb mixed oxides; Formic acid; Acetic acid; Propionic acid; Degradation; Oxidative degradation
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Oxidative and non-oxidative degradation of C1–C3 carboxylic acids over V2O5/TiO2 and MoVTeNb oxides: A comparative study
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 466, 10 September 2013, Pages 45–50
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
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Full-text PDF Download
Online Support
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