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Catalytic abatement of trichloroethylene over Mo and/or W-based bronzes

Paper ID Volume ID Publish Year Pages File Format Full-Text
45813 46423 2013 8 PDF Available
Title
Catalytic abatement of trichloroethylene over Mo and/or W-based bronzes
Abstract

In this paper we present the results of the synthesis, characterization and catalytic behaviour of Mo(W)–Nb–V–O mixed metal oxides bronzes for the catalytic oxidation of trichloroethylene. The catalysts were prepared hydrothermally with different Mo/W/Nb/V/P atomic ratio and heat-treated at 500 and 700 °C. They were characterized by several techniques as N2-adsorption, X-ray diffraction, FTIR, SEM-EDS, temperature programmed desorption, temperature programmed reduction, UV–vis, Fourier transformed infrared spectroscopy of adsorbed pyridine and 18O/16O isotope exchange. X-ray diffraction patterns (XRD) of samples heat-treated at 500 °C suggest the presence of a semi-crystalline material with a diffraction peak at ca. 2θ = 22.2°, while XRD patterns of samples heat-treated at 700 °C show the formation of a tetragonal tungsten bronze (TTB) structure. The activity for the catalytic abatement of trichloroethylene strongly depends on the heat-treatment temperature and the catalyst composition. Thus, samples with W/(Mo + W) atomic ratios of 0.25-0.75 and heat-treated at 500 °C are the most active ones. The enhanced activity has been related to the remarkable higher surface area of the catalyst and to the catalyst composition which influences the acid characteristics as well as the reducibility and reoxidation of the catalysts. The importance of the oxygen dissociation on the catalyst surface and the diffusion of oxygen species through the catalyst are also discussed.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► W,Mo-containing bronzes are active catalysts for the catalytic oxidation of TCE. ► Bronzes show higher catalytic activity than the zeolitic reference catalyst (H-MOR). ► The most active catalyst, i.e. MW-50, was achieved for a W/(Mo + W) ratio of ca. 0.50. ► The catalytic activity is strongly related to the W/(Mo + W) ratio of catalysts.

Keywords
Catalytic oxidation; Chlorinated VOCs; Trichloroethylene; Mo–W–O mixed oxides bronzes
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Catalytic abatement of trichloroethylene over Mo and/or W-based bronzes
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 130–131, 7 February 2013, Pages 36–43
Authors
, , , , , ,
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
100% Money Back Guarantee
Full-text PDF Download
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