In situ study of ozone and hybrid plasma Ag-Al catalysts for the oxidation of toluene: Evidence of the nature of the active sites

Monica Magureanu, Daniela Piroi, Nicolae Bogdan Mandache, Vasile I. Pârvulescu, Viorica Pârvulescu, Bogdan Cojocaru, Chris Cadigan, Ryan Richards, Helen Daly, Christopher Hardacre

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Silver colloids have been prepared by reducing AgNO3 in aqueous solution and embeded in alumina following a sol-gel procedure in the presence of Pluronic 84 ((EO)19(PO)39(EO)19), as surfactant. Plasma-catalytic experiments aimed at the mineralization of toluene showed that the selectivity to CO2 was significantly increased in the presence of Ag catalysts compared with results obtained using the plasma alone. In-situ studies of the ozone interaction with catalysts provide an insight into the nature of the active sites of supported silver colloids for mineralization reactions. It is noticeable that when ozone is chemisorbed on embedded Ag colloidal catalysts no change in the silver oxidation state or size is found. The population of the chemisorbed species is higher at lower temperatures, where the non-selective decomposition of ozone is smaller. The catalysts exhibit high stability, preserving the structural and textural properties after the catalytic tests, that is indeed very important in the presence of ozone.

    Original languageEnglish
    Pages (from-to)84-90
    Number of pages7
    JournalApplied Catalysis B: Environmental
    Volume104
    Issue number1-2
    DOIs
    Publication statusPublished - 27 Apr 2011

    Keywords

    • Catalyst
    • Colloid
    • Hydrocarbon
    • Oxidation
    • Plasma
    • Silver

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