钌钯/炭催化剂催化苯甲酸加氢制备环己基甲酸

对钌钯/炭催化剂催化苯甲酸加氢制备环己基甲酸进行研究,考察金属负载量、溶剂用量、反应温度和反应压力对反应的影响,并考察催化剂重复使用性能。结果表明,使用自制的钌钯/炭催化剂,催化剂中金属钌纳米粒子和钯纳米粒子负载质量分数分别为5.0%和0.5%、m(苯甲酸)∶m(环己基甲酸)=2∶1、反应温度(135~145)℃和反应压力(4~5)MPa条件下,苯甲酸转化率≥99.3%,环己基甲酸选择性≥99.0%。催化剂重复使用16次,仍具有较高活性。

Catalytic hydrogenation of benzoic acid to cyclohexanecarboxylic acid by Ru-Pd/C catalyst

The hydrogenation of benzoic acid to cyclohexanecarboxylic acid over Ru-Pd/C catalysts was studied.The effects of metal loading amounts,solvent dosage,reaction temperatures and reaction pressure and the repeated use performance of the catalyst were investigated.The results indicated that using Ru-Pd/C catalyst with Ru mass fraction of 5.0% and Pd mass fraction of 0.5% as the catalyst and cyclohexanecarboxylic acid as the solvent,benzoic acid conversion and the selectivity to cyclohexanecarboxylic acid were ≥99.3% and ≥99.0%,reapectively,under the condition as follows:m(benzoic acid)∶m(cyclohexanecarboxylic acid)=2∶1、reaction temperature (135-145) ℃ and reaction pressure (4-5) MPa.The catalyst exhibited higher catalytic activity after repeated use 16 times.