DMF回收工艺中钯碳催化剂的应用性能研究

Application of carbon palladium catalyst in recycling process of DMF

采用挤压成型法对钯碳粉末催化剂进行成型,研究了反应温度、反应时间、催化剂用量等因素对成型钯碳催化剂催化分解甲酸活性的影响。结果表明:氧化铝与钯碳粉末催化剂以质量比1.5∶1的比例混合,加入适量的水玻璃,制得成型钯碳催化剂。在反应温度为153℃,反应时间为3 h,催化剂质量分数为3%的优化条件下,成型钯碳催化剂催化甲酸分解率为79.55%。多次重复使用,成型钯碳催化剂催化活性良好,机械强度高,具有工业使用价值。

Palladium-carbon catalyst is prepared by extrusion moulding method. The effects of reaction temperature, reaction time, the amount of catalyst and other factors on the formic acid decomposition by the resulting palladium-carbon catalyst are studied. The results show that the molded palladium-carbon catalyst with high mechanical strength and good catalytic activity can be achieved when the ratio of the alumina and palladium carbon catalyst is 1.5 ： 1 and an appropriate amount of sodium silicate is added. The formic acid decomposition rate can reach 79. 55% under the following conditions： 153℃ of reaction temperature,3 hours of reaction time and 3 wt% of the obtained catalyst. After being reuses for several times, the palladium carbon catalyst still exhibits good catalytic activity and high mechanical strength, which is promising for industrial application.