• catalytic oxidation of 1,2-dichlorobenzene over caco3/α-fe2o3 nanocomposite catalysts

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 1090
    • تعداد پرسش و پاسخ ها: 0
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     caco3/α-fe2o3 nanocomposites were synthesized by one-pot method to develop a low-cost and environmentally friendly technology for the catalytic oxidation of 1,2-dichlorobenzene (o-dcb), a model of chlorinated volatile organic compounds. the nanocomposites were characterized by faas, xrd, n2adsorption/desorption, tem and xps. activity measurements were conducted in the range of 200–500 °c, in both the presence and absence of water. among the tested catalysts, the nanocomposite with 9.5 mol% ca showed the highest catalytic activity, which could be attributed to the promoting effect of caco3 on α-fe2o3with smaller crystallite size. experimental results in the presence of water indicated that, due to the competitive adsorption of water on the active sites, there was a local minimum of catalytic activity at 350 °c. in situ ftir experimental results revealed the presence of phenolate, catecholate, o-benzoquinone, carboxylate and anhydride type species on the surfaces of the catalysts during the oxidation of o-dcb. spectral evidence discovered that the formate species were more prone to being formed on the surface of nanocomposite with 9.5 mol% ca and then were further oxidized to co, which directly lead to high activity of the catalyst. a mechanism involving dissociative adsorption of o-dcb on the surface of catalyst was proposed.

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