摘要
以ZnO为催化剂,苯甲酸为原料,通过加氢还原制备了苯甲醛。考察了反应温度、氢/酸摩尔比和气时空速对催化活性的影响。结果表明,在反应温度350℃、氢/酸摩尔比60∶1、气时空速1500h-1的条件下,催化剂表现出最佳活性。此时,苯甲酸的转化率达99.4%,苯甲醛的选择性达93.6%。随着反应时间的延长,催化剂活性有所下降;失活催化剂经活化后,催化性能可以很好地恢复。采用BET、XRD技术对反应前后的催化剂进行了表征。
Benzaldehyde was prepared from benzoic acid by hydrogenation using ZnO as catalyst. The effects of reaction temperature, molar ratio of H2 to benzoic acid, and GHSV on catalytic activity of ZnO were investigated. The results showed that ZnO had the best catalytic activity, the translation ratio of benzoic acid was 99.4 %, and the selection of benzaldehyde was 93.6 % under following reaction conditions：reaction temperature 350℃, molar ratio of 1-I2 to benzoic acid 60 ： 1, and GHSV 1 500 h^-1. The catalytic activity of ZnO reduced with the increase of reaction time, but it could be primely renewed by Key Words benzaldehyde, benzoic acid baking activation. The catalyst was characterized by BET and XRD.
出处
《精细石油化工进展》
CAS
2007年第6期34-36,41,共4页
Advances in Fine Petrochemicals
关键词
苯甲醛
苯甲酸
氧化锌
加氢
催化
benzaldehyde, benzoic acid, ZnO, hydrogenation, catalysis
