シアノベンゼン類の接触的合成法に関する研究(第1報) : トルエンとアンモニアの気相接触反応

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A vapor phase catalytic reaction between toluene and ammonia in the presence of molybdenum oxide and vanadium oxide, respectively, was investigated. The activityfor formation of benzonitrile was better in molybdenum oxide carrying catalystt but the selectivity for benzonitrile was superior in vanadium oxide carrying catalyst. The activity of vanadium oxide-alumina catalyst did not change during the experimental period of about 10 hours, but that of molybdenum oxide-alumina catalyst decreased with the time of reaction: however, it was regenerated by the heating in air. A preliminary treatment of vanadium oxide catalyst in an atmosphere of ammonia at 550°c showed practically no change in the activity of catalyst, but that of molybdenum oxide catalyst showed considerable decrease in its activity. It was considered to be mainly due to the formation of lower oxide by the reduction of molybdenum oxide in this reaction atmosphere. It was found that the acidity of catalyst carrier was injurious, as by the action of alumina gel or silicagel of acidic nature on molybdenum oxide, the formation of benzene was accele rated. The catalyst with sintered alumina carrier treated at 1200°c was effective por to inhbit the formation of benzene as a by-product and to improve the selectivity formation of benzonitrile. It was indicated that the rate determining step was before the formation of benzylamine, that the formation of benzonitrile from benzylamine with molybdenum oxide catalyst was proceeded mainly through dehydrogenation process, and that the benzonitrile formation with vanadium oxide catalyst was proceeded mainly through disproportionation.
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シアノベンゼン類の接触的合成法に関する研究(第1報) : トルエンとアンモニアの気相接触反応

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