The Catalytic Activity of Zinc Acetate Supported on Active Carbons and the Pore Structure of the Carriers

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Other Title
  • 活性炭担持した酢酸亜鉛触媒の活性と担体の細孔構造との関係

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Rates of catalytic reaction, CH3COOH + C2CH2 CH, COOC, H, , have been determined by using a number of carrier specimen of active carbon. They consisted of A---/E and F series activated by carbon dioxide in various degree, and each of which contained a different amount f (g /g-C) of zinc acetate as catalyst. Pore distributions of supported catalysts as well as carriers have been determined by means of the mercury porosimeter and in terms of the sorption isotherms of benzene at 0°C. Although the pore structures of carriers were quite different from one another as shown in Fig.1, the analysis of data given in Tables 1 and 2 exhibited clearly that most of zinc acetate would be deposited only in the micropores. It has been confirmed again that catalytic activity k° referred to unit weight of the carrier increased linearly with f values and then became constant kt° above a limiting value ft, as shown in Figs.3 and 4. Fig.5 shows clearly that in F series, as the activation degree w of specimens increased, ft, kt° and the micropore volume Omicro of carrier increased.<BR>Fig.6 shows that ft. 'k° relation for all the carriers was linear within the error of 10% except some carriers of lower activation degree.<BR>Therefore, the catalytic activity was attributed to zinc acetate deposited in micropores of carrier and the effect of diffusion on the rate could not be found, revealing the macro-micro pore model of granular active carbon, described in previous paper, to be valid.

Journal

  • NIPPON KAGAKU KAISHI

    NIPPON KAGAKU KAISHI 1972 (12), 2282-2287, 1972-12-10

    The Chemical Society of Japan

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