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Application of silica-supported Ir and Ir-M (M=Pt, Pd, Au) catalysts for low-temperature hydrodechlorination of tetrachloromethane
Polish Acad Sci, Inst Phys Chem, PL-01224 Warsaw, Poland.
Silesian Tech Univ, Inst Engn Mat & Biomat, PL-44100 Gliwice, Poland.
Polish Acad Sci, Inst Phys Chem, PL-01224 Warsaw, Poland.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Physical Chemistry. Polish Acad Sci, Inst Phys Chem, PL-01224 Warsaw, Poland.ORCID iD: 0000-0003-2124-9510
2018 (English)In: Science of the Total Environment, ISSN 0048-9697, E-ISSN 1879-1026, Vol. 644, p. 287-297Article in journal (Refereed) Published
Abstract [en]

Herein, it is presented a catalytic system for gas-phase hydrodechlorination of tetrachloromethane at low temperature and atmospheric pressure, using iridium supported on silica as parent catalyst. Iridium electronic configuration is suitable to catalyse the hydrodechlorination reactions, however, it has been rarely used in this reaction to date. The catalytic abilities were significantly improved when a second transition metal was added. Catalysts' stability and selectivity to the desired products (i.e. C-1-C-4 hydrocarbons) improved compared to conventional activation in hydrogen when catalysts were activated shortly with microwave irradiation. Microwave irradiation of catalysts favourably influences the homogeneity of the metallic active phase, both in terms of the size of metal crystals and the homogeneity of bimetallic systems. Addition of platinumto the 'parent' iridium catalyst improved its catalytic properties and decreased deactivation. Fresh and spent catalysts were comprehensively characterized using several techniques (BET, CO-chemisorption, XRD, XPS, electron microscopy and mass spectrometry) to determine structure-activity relationships and potential causes for catalyst deactivation. No significant changes in crystalline size or bimetallic phase composition were observed for spent catalysts (with the exception of Ir-Pd catalysts which underwent bulk carbide during the reaction).

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV , 2018. Vol. 644, p. 287-297
Keywords [en]
Hydrodechlorination of tetrachloromethane, Iridium nanoparticles, Bimetallic catalysts, Selectivity for hydrocarbons, High stability, Microwave irradiation
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-367011DOI: 10.1016/j.scitotenv.2018.06.270ISI: 000445164000029PubMedID: 29981976OAI: oai:DiVA.org:uu-367011DiVA, id: diva2:1266520
Available from: 2018-11-28 Created: 2018-11-28 Last updated: 2018-11-28Bibliographically approved

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