酸化クロム-アルミナ触媒によるイソペンタンの接触脱水素反応

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タイトル別名
  • Catalytic Dehydrogenation of Isopentane on Al<sub>2</sub>O<sub>3</sub>-Cr<sub>2</sub>O<sub>3</sub> Catalyst

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説明

As a basic research for the study of the dehydrogenation of paraffins, the catalytic dehydrogenation of isopentane has been studied on Al2O3-Cr2O3 catalyst. Catalysts were prepared by impregnation of CrO3 on Al2O3, and were reduced with hydrogen at 550°C. Nitrogen was used as a diluent. Reaction conditions were as follows; Pi=0.08-0.13atm, t=460-540°C, W/F=11.4-56.7 hr•g-cat/mol-feed. Under these conditions, isoamylenes (3M1B, 2M1B, 2M2B) and isoprene were formed as dehydrogenation products, and dehydroisomerization (1-P+2-P) and cracking (C1-C4) took place to a small extent as the side reactions. The composition of isoamylenes did not depend on the type of catalyst, Pi and W/F, but showed an isomerization equilibrium. As the contents of Cr2O3 increased, the dehydrogenation activity increased, and lowered with the addition of hydrogen, isoprene or pyridine in the reaction system. The initial activity of the oxidized catalyst was higher than that of the reduced catalyst. The effect of addition of alkali metal oxide or alkaline earth metal oxide to Al2O3-Cr2O3 catalyst was also investigated. The addition of such a metal oxide reduced the acidity (pKa_??_+3.3). It was suggested that the yield of isoprene correlates with the ionic radius of the added metal oxide. The order of the reactivity of isopentane, 2M1B and 2M2B as a feedstock under the same conditions were as follows; 2M1B>2M2B>Isopentane.

収録刊行物

  • 石油学会誌

    石油学会誌 16 (1), 44-50, 1973

    公益社団法人 石油学会

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