Acidic Property of Dealuminated Mordenite treated by Hydrochloric Acid

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  • 塩酸処理により脱アルミニウムしたモルデナイトの酸特性
  • エンサン ショリ ニ ヨリ ダツ アルミニウムシタ モルデナイト ノ サン ト

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Abstract

Acidic properties of dealuminated Mordenite treated by hydrochoric acid were characterized by TPD method and isomerization reactions of butenes. The ratio of a luminum contents and th e strong acid amounts in Mordenite is a lmost 1: 1 in the ranges of SiO2Al2O3, 35∼70, and when the ratio of SiO2Al2O3 deviates from these values, the strong acid amounts do not correspond to aluminum contents. The ratio of the weak acid amounts and the stro ng acid amounts is about 1: 2. Since heats of adsorption of NH3 are 149±2 kJ/mol in all ranges of SiO2Al2O3, it is suggested that the sti-ength of the acid is independent of aluminum contents.<BR>Desorption products of C3H6-TPD are dependent on SiO2Al2O3 ratio of Morde nite. In small ratio of SiO2Al2O3, propene molecules are adsorbed directly on the acid sites and desorbed with production of normal hydrocarbons which are produced by interactions between adsorbates. In medium ratio of SiO2Al2O3 oligomers are formed on the acid sites and they are desorbed producing branched isomers.<BR>In the isomerization reactions of butenes, the Mordenite having the larger amount of the acid reveals the higher catalytic activity. The catalytic activity is higher in the isomerization reaction of buten es, as amounts of the acid of Mordenite are larger, but the acid strength of t he catalyst is n ot influenced by t h e amounts of the acid.

Journal

  • NIPPON KAGAKU KAISHI

    NIPPON KAGAKU KAISHI 1994 (10), 874-882, 1994-10-10

    The Chemical Society of Japan

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