Ni/Al2O3催化2-甲基呋喃加氢制2-甲基四氢呋喃性能的研究

采用浸渍法制备了不同NiO含量的Ni/Al₂O₃催化剂，并进行了2-甲基呋喃加氢制2-甲基四氢呋喃性能的考察。结果表明，在制备的NiO负载量为10%、20%、25%、30%和40%的Ni/Al₂O₃催化剂中，随着NiO负载量增加，加氢反应的选择性与2-甲基呋喃的转化率均呈现出先增加后减小的趋势。其原因是由于适当增加NiO负载量有利于催化剂表面活性中心的形成，有利于加氢反应的进行；但是过度负载的NiO容易堵塞Al₂O₃载体中的介孔通道，降低反应的转化率与选择性。在釜式反应器中进行反应，对加氢反应条件进行了优化，发现在反应压力为3 MPa、反应温度150℃、机械搅拌速率为1000 r/min时，Ni/Al₂O₃催化2-甲基呋喃加氢制2-甲基四氢呋喃具有较高的选择性。当NiO负载量为25%时，2-甲基四氢呋喃的选择性最高为97.1%，2-甲基呋喃的转化率达到99.4%。

Catalytic performance of Ni/Al2O3 catalyst for hydrogenation of 2-methylfuran to 2-methyltetrahydrofuran

Ni/Al₂O₃ catalyst with various NiO loading was prepared with impregnation method. The catalytic performance for hydrogenation of 2-methylfuran to 2-methyltetrahydrofuran was investigated in this work. The results indicated that with an increase of NiO contents (10%, 20%, 25%, 30% and 40%), 2-methylfuran conversion rate first increased and then dropped to a low level. The selectivity of this hydrogenation reaction showed the same trend. It was mainly because that NiO can produce more active center on catalyst surface, which was good for hydrogenation reaction. However, overloading of NiO blocked the mesopores of supportive Al₂O₃, and thus reduce the reaction selectivity and conversion rate. In batch reactor, after optimization the hydrogenation selectivity rate can be improved under hydrogen partial pressure of 3 MPa, reaction temperature of 150°C and stirring speed of 1000 r/min. As a result, 2-methyltetrahydrofuran selectivity of 97.1% and 2-methylfuran conversion rate of 99.4% can be achieved with 25% NiO loading.