Pd/CNTs苯酚气相加氢制环己酮催化剂

摘要

通过对纳米碳管进行纯化、表面修饰处理,浸渍PdCl2溶液制得Pd/CNTs催化剂,进行化学组成及XRD表征,测试Pd/CNTs催化剂对苯酚气相加氢制环己酮的催化性能.实验结果表明：Pd负载到CNTs上,负载量为0.97%（质量分数）,负载后的碳纳米管仍然保留碳纳米管的结构.Pd/CNTs催化性能测试结果表明：反应温度为150℃,氢酚摩尔比4∶1,液体进料速率0.42 mL/g.h的条件下催化剂活性较好,此时苯酚转化率43.17%,环己酮选择性达68.36%.%Pd/CNTs was prepared by impregnation with PdCl2 and carbon nanotubes （CNTs）.Before impregnation,CNTs were purified and modified using H2SO4 and HNO3.The resulted Pd/CNTs was characterized by ultraviolet spectrophotometry and XRD.It was showed that Pd was loaded on the CNTs and its content was 0.97 %.The structure of CNTs was kept its original structure.It was indicated that the better catalytic performance of Pd/CNTs was obtained under the following conditions：reaction temperature was 150 ℃,the molar ratio of H2 to phenol was 4 and the feed rate was 0.42 mL/g·h.The phenol conversion of 43.17 % and cyclohexanone selectivity of 68.36 % was obtained under the above condition.