KNO_3/Al_2O_3的制备及其对催化合成假紫罗兰酮的影响

Preparation of solid base KNO_3/Al_2O_3 and effects of catalyst preparation conditions on catalytic synthesis of pseudoionone

采用了浸渍法制备了KNO3/Al2O3固体碱催化剂,考察了催化剂制备条件对假紫罗兰酮合成的影响,并对其进行了Hammett指示剂法、FTIR、XRD表征分析。结果表明:所制备的催化剂在催化合成假紫罗兰酮的缩合反应中表现出良好的活性,当活性组分KNO3的负载质量分数为25%、浸渍时间为6 h、焙烧温度为600℃时,所制备的催化剂催化合成假紫罗兰酮产率可达87.5%。对催化剂的表征结果表明,催化剂的活性与高温焙烧KNO3和Al2O3发生相互作用形成的Al-O-K结构及KNO3分解产物K2O有关。

The solid base catalyst KNO3/Al2O3 was prepared by impregnation method. The effects of catalyst preparation conditions on the yield of pseudoionone were investigated. The catalysts were characterized by Hammett indicator method,FTIR, XRD. The results show that the catalyst exhibits an excellent catalytic activity for synthesis of pseudoionone;When the solid base catalyst loaded with was 25%KNO3, impregnation time was 6 hours and calcination temperature was 600℃, exhibits a high catalytic activity for the condensation, the catalytic synthesis yield of pseudoionone with the prepared catalyst reached 87.5%. The characterization results revealed that the catalyst activity of KNO3/Al2O3 was associated with Al-O-K and K2O （decomposed and produced by KNO3）, which formed from the interaction between KNO3 and Al2O3 during calcination.