碱金属盐对低氢酯比下苯甲酸甲酯加氢催化剂的修饰

Alkali metallic salts modification for catalyst of hydrogenation of methyl benzoate at low H_2/ester molar ratio

为了考察了Mn与Zn摩尔配比以及不同碱金属盐修饰制得的锰锌复合氧化物催化剂对苯甲酸甲酯气固催化加氢合成苯甲醛反应活性和选择性的影响,在氢酯比为1.5的条件下,进行苯甲酸甲酯催化加氢反应,发现以5%LiCl修饰的活性组分负载量为25%、n(Mn)/n(Zn)为1.14的MnO-ZnO/γ-Al2O3催化剂,在常压、430℃、空时为1.84 h时,苯甲酸甲酯的转化率为97.71%,苯甲醛的选择性为84.80%.

To study the effect of Zn/Mn molar ratio and alkali metallic salts modification on the catalytic performance for hydrogenation of methyl benzoate to benzaldehyde, experiments were carried out at 1.5 H2/ester molar ratio in the fixed-bed reactor. The results showed that MnO-ZnO/γ-Al2O3 with 1.14 Mn/Zn molar ratio and 25% active component loading amount decorated by 5 % LiCl had a better performance for the reaction under atmospheric pressure,430 ℃, space time 1.84 h conditions. The conversion of methyl benzoate and the selectivity of benzaldehyde could achieve 97.71% and 84.80%. The XRD spectrum showed that metal oxides could be distributed well on the surface of T-Al2O3.