Effect of ball milling on the catalytic activity of cryptomelane for VOC oxidation

• Type: Article in International Scientific Journal
• Date: 2018

Authors

Diogo Santos (Author) FEUP; Olívia S. G. P. Soares (Author) FEUP; José L. Figueiredo (Author) Other; Manuel Fernando R. Pereira (Author) FEUP

Journal

Title: Environmental Technology (United Kingdom)

Vol. 41 No. 1

Pages: 1-14

ISSN: 0959-3330

Publisher: Taylor & Francis

Indexing

ISI Web of Knowledge - 4 Citations

ISI Web of Science

Scopus - 8 Citations

Associated Projects

AIProcMat@N2020 - Advanced Industrial Processes and Materials for a Sustainable North Region of Portugal2020

Other information

Authenticus ID: P-00P-294

DOI: 10.1080/09593330.2018.1491639

Abstract (EN): Cryptomelane-type manganese oxides prepared by a solvent-free method were evaluated as catalysts for the oxidation of ethyl acetate, ethanol and toluene. The original catalyst (K-OMS-2) presented high catalytic activity for ethyl acetate and ethanol oxidation, achieving 90% conversion into CO2 around 200°C for both pollutants. Toluene was much harder to oxidize, requiring a temperature near 270°C for the same conversion. The original catalyst was mechanically treated in a ball mill at different intensities, in order to decrease the particle size for subsequent impregnation onto structured supports, as small particle sizes are usually recommended. The catalytic activity of the materials decreases with the increase in the severity of this treatment, which is related to the decrease of the surface area of the catalysts, since the other properties (phase purity, thermal stability, surface oxygen, average oxidation state and reactivity of the oxygen species) are similar among the catalysts with different ball milling treatments. For comparison, a platinum-based catalyst (1%-Pt/Al2O3) was also tested, which exhibited a high activity for toluene, but much lower activities for the two other volatile organic compounds tested. A long-term experiment, using ethanol as model pollutant, showed that the cryptomelane catalyst was stable for more than 100¿h. © 2018 Informa UK Limited, trading as Taylor & Francis Group

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 14