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Title of the paper: Catalytic activity of Fe/ZrO2 nanoparticles for dimethyl sulfide oxidation

Authors: Keshav Chand Soni*, S. Chandra Shekar, Beer Singh, T. Gopi

University/Institute:PD Division, Defence Research and Development Establishment, Gwalior 474002, India

Abstracts:

Abstract

A low-temperature vapor phase catalytic oxidation of dimethyl sulphide (DMS) with ozone over nano-sized Fe2O3–ZrO2 catalyst is carried out at temperatures of 50–200 ºC. Nanostructured Fe2O3–ZrO2 catalyst (FZN) is prepared by modified sol-gel method using citric acid as a chelating agent and conventional FZ catalyst is prepared with co-precipitation method. The catalysts are characterized using N2–BET surface area and pore size distributions, X-ray diffraction, TPR, TPD of DMS and NH3, SEM and TEM. The effects of operating temperature, ozone/DMS concentration and gas hourly space velocity (GHSV) on DMS removal efficiencies via catalytic ozonation are investigated. Relatively higher amount of ozone decomposition is observed on nanocatalyst compared to the co-precipitate catalyst from 50 ºC to 150 ºC. In contrast, at 200 ºC irrespective of the particle size, both catalysts performed similar activity. It clearly demonstrates that under ozone assisted catalytic oxidation over nanocatalyst offers the 100 % of DMS conversion at lower temperature. The synthesized nanocatalyst and ozone are observed highly efficient for low temperature catalytic oxidation of DMS. The stability test shows that the nanocatalyst have relatively high activity and stability under the reaction conditions. A plausible reaction mechanism has been proposed for the oxidation of DMS based on the possible reaction products.

Journal, Issue, Page Nr.: Journal of Colloid and Interface Science 446 (2015) 226–236

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    Catalytic oxidation of carbon monoxide over supported palladium nanoparticles

    Keshav Chand Soni • R. Krishna • S. Chandra Shekar • Beer Singh

    Received: 22 September 2014 / Accepted: 11 February 2015

    Journal- Applied Nanoscience

    DOI 10.1007/s13204-015-0419-5
    Abstract

    Catalytic oxidation of CO with ozone had been studied over Al2O3 and SiO2 supported Pd nanoparticles which was synthesized by two different methods. The polyol method mainly resulted in highly dispersed Pd particles on the support, while the impregnation method resulted in agglomeration Pd particles on the support. Supported Pd nanoparticles synthesized from PdCl2 in the presence of poly (N-vinylpyrrolidone) (PVP) by chemical reduction. The catalysts were characterized by X-ray diffraction, N2 BET surface area, pore size distributions, CO chemisorption, TEM and H2-temperature programmed reduction. The physico-chemical properties were well correlated with activity data. Characterizations of XRD and TEM show that the surface Pd nanoparticles are highly dispersed over Al2O3 and SiO2. The catalytic activity was dependent upon ozone/CO ratio, contact times, and the reaction temperature. The extent of carbon monoxide oxidation was proportional to the catalytically ozone decomposition. The PVP synthesized Pd/A2O3 catalyst had been found to be highly active for complete CO removal at room temperature. The higher activity of the nanocatalyst was attributed to small particle size and higher dispersion
    of Pd over support.

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