• J Karuppiah

      Articles written in Journal of Chemical Sciences

    • Nonthermal plasma assisted photocatalytic oxidation of dilute benzene

      J Karuppiah E Linga Reddy L Sivachandiran R Karvembu Ch Subrahmanyam

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      Oxidative decomposition of low concentrations (50-1000 ppm) of diluted benzene in air was carried out in a nonthermal plasma (NTP) dielectric barrier discharge (DBD) reactor with the inner electrode made up of stainless steel fibres (SMF) modified with transition metal oxides in such a way to integrate the catalyst in discharge zone. Typical results indicate the better performance of MnO$_x$ and TiO2/MnO$_x$ modified systems, which may be attributed to the in situ decomposition of ozone on the surface of MnO$_x$ that may lead to the formation of atomic oxygen; whereas ultraviolet light induced photocatalytic oxidation may be taking place with TiO2 modified systems. Water vapour improved the selectivity to total oxidation.

    • Catalytic non-thermal plasma reactor for the decomposition of a mixture of volatile organic compounds

      B Rama Raju E Linga Reddy J Karuppiah P Manoj Kumar Reddy Ch Subrahmanyam

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      The decomposition of mixture of selected volatile organic compounds (VOCs) has been studied in a catalytic non-thermal plasma dielectric barrier discharge reactor. The VOCs mixture consisting n-hexane, cyclo-hexane and 𝑝-xylene was chosen for the present study. The decomposition characteristics of mixture of VOCs by the DBD reactor with inner electrode modified with metal oxides of Mn and Co was studied. The results indicated that the order of the removal efficiency of VOCs followed as 𝑝-xylene > cyclo-hexane > 𝑛-hexane. Among the catalytic study, MnOx/SMF (manganese oxide on sintered metal fibres electrode) shows better performance, probably due to the formation of active oxygen species by in situ decomposition of ozone on the catalyst surface. Water vapour further enhanced the performance due to the in situ formation of OH radicals.

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