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The effect of A-site substitution by Sr, Mg and Ce on the catalytic performance of LaMnO3 catalysts for the oxidation of vinyl chloride emission

Paper ID Volume ID Publish Year Pages File Format Full-Text
45796 46422 2013 6 PDF Available
Title
The effect of A-site substitution by Sr, Mg and Ce on the catalytic performance of LaMnO3 catalysts for the oxidation of vinyl chloride emission
Abstract

Catalytic oxidation of vinyl chloride (VC) emission was carried out over LaMnO3 and La0.8A0.2MnO3 (A = Sr, Mg and Ce) perovskite oxides synthesized via co-precipitation method. Numerous characterization techniques were performed to investigate the relationship between the catalytic performance and its physicochemical properties. It was found that the partial substitution of lanthanum by cerium and magnesium had a positive effect on the catalytic performance for VC oxidation, whereas strontium involved a negative effect. Under the reaction conditions (VC concentration = 1000 ppm, GHSV = 15,000 h−1), the overall catalyst ranking in terms of the catalytic activity from the best to the worst performance was La0.8Ce0.2MnO3 > La0.8Mg0.2MnO3 > LaMnO3 > La0.8Sr0.2MnO3 with regard to the temperature of T50 and T90. The Ce-doped perovskite catalyst showed the optimum catalytic performance due to its higher specific surface area and its ability to promote the low-temperature reducibility. Moreover, as the active species, the increased surface adsorbed oxygen was also responsible for the enhancement of the catalytic performance.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► LaMnO3 and La0.8A0.2MnO3 (A = Sr, Mg and Ce) were prepared by co-precipitation method. ► The A-site substitution modified the amounts of Mn4+ and adsorbed oxygen on the surface. ► No by-products were formed but only CO2, H2O and HCl. ► La0.8Ce0.2MnO3 presented the best catalytic performance for vinyl chloride abatement. ► Reducibility and surface adsorbed oxygen were the main parameters.

Keywords
Vinyl chloride; Catalytic oxidation; Perovskite catalyst; Reducibility; Adsorbed oxygen
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The effect of A-site substitution by Sr, Mg and Ce on the catalytic performance of LaMnO3 catalysts for the oxidation of vinyl chloride emission
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 134–135, 2 May 2013, Pages 310–315
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
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us