WO_3/HMS分子筛的合成及其催化性能

以(NH4)2WO4为钨源,采用浸渍法,在不同pH值、模板剂种类、模板剂用量和硅钨比等条件下合成多相催化剂WO3/HMS,利用XRD手段对催化剂的结构进行了表征,研究了催化剂在环戊烯选择性氧化合成戊二醛反应中的催化性能.结果表明:在pH=4、硅源为正硅酸乙酯(TEOS)、模板剂为十二胺(DDA)、n(DDA)/n(TEOS)=0.20,n(Si)/n(W)=30的条件下合成的WO3/HMS分子筛催化活性最高,戊二醛的收率最高可达67%.催化剂具有较高的稳定性,可以重复使用5次,失活后的催化剂可通过高温焙烧的方式再生.

Synthesis and catalytic performance of WO3/HMS molecular sieve

Using(NH4)2WO4 as W source,the WO3/HMS catalysts were prepared by impregnation method in different pH value,template agent type,template agent dosage and Si/W molar ratio.The catalysts were characterized by XRD technique.The catalytic performance of the catalysts was investigated for the synthesis of glutaraldehyde from cyclopentene by seleltive oxidation.The results showed that the WO3/HMS catalysts showed the highest catalytic activity at pH=4,orthosilicate(TEOS) as Si source,template agent dodecuylamine,n(DDA)/n(TEOS)=0.20,n(Si)/n(W)=30 and the highest yield 67% of glutaraldehyde was achieved.The WO3/HMS catalysts was very stable and could be reused for five times.The deactivated catalyst was regenerated by high temperature calcination.