负载型双金属催化剂催化间苯二甲腈加氢制备间苯二甲胺

采用浸渍法制备活性炭负载Ni、Ru、Rh单金属及Ni-Ru、Ru-Rh双金属催化剂,考察反应温度、反应压力和m(催化剂)∶m(间苯二甲腈)对间苯二甲腈加氢制备间苯二甲胺的影响。结果表明,Ni-Ru/C催化活性高于Ru/C和Ni/C,通过分步浸渍法制备的Ni-Ru/C催化活性优于一步浸渍法。以甲醇和甲苯为混合溶剂,在m(催化剂)∶m(间苯二甲腈)=1∶20、反应温度120℃、反应压力4.0 MPa和1 000 r·min-1条件下,无需加入碱性抑制剂,间苯二甲胺收率最高可达97.78%。

Preparation of m-xylylenediamine by the hydrogenation of m-phthalonitrile catalyzed by bimetallic catalysts

Ni,Ru,Rh monometal and Ni-Ru and Ru-Rh bimetallic catalysts supported on activated carbon were prepared by the impregnation method.The effects of reaction temperatures,reaction pressure and m(catalyst)∶m(m-phthalonitrile) on the hydrogenation of isophthalonitrile to m-xylylenediamine were investigated.The results showed that the activity of Ni-Ru/C catalyst was better than that of Ru/C and Ni/C catalysts.The property of Ni-Ru/C catalyst prepared by separate-step impregnation method was superior to that by one step impregnation method.The maximum m-xylylenediamine yield reached 97.78% under the condition of m(catalyst)∶m(m-phthalonitrile)=1∶20,1 000 r·min^-1,reaction temperature 120 ℃ and reaction pressure 4.0 MPa with the mixture solvent of methanol and toluene and without any alkaline inhibitors.