摘要
以Keggin型钨硅酸为母体化合物,利用直接沉淀法将2,2'-联咪唑(H2biim)、Ni2+、Cu2+及其联咪唑配合物引入多金属氧酸盐(POM)中,合成了Keggin型Ni/Cu/H2biim-钨硅酸盐系列化合物。通过单晶X-射线衍射、红外光谱(IR)和元素分析等手段对所合成的化合物进行了表征。以催化环己酮与乙二醇反应合成环己酮乙二醇缩酮为模型反应,研究探讨了该系列钨硅酸盐的催化性能。结果表明,大的抗衡离子引入减小了POM的溶解性,催化剂可回收重复使用,提高了催化剂的利用率。该系列钨硅酸盐非均相催化剂,经3次循环使用后,其催化活性几乎不变。
A series of Keggin-type Ni/Cu/H2biim-tungstosilicates （ H2biim = 2,2＇-biimidazole） were syn- thesized with the parent tungstosilicacid as a reactant and H2biim,Ni2 ＋/Cu2＋ and their complexes as raw materials by a direct precipitation method. They were characterized by single crystal XRD, IR and elemen- tal analysis. The acid-catalyzed synthesis of cyclohexanone ethylene ketal by the reaction of cyclohexanone with ethylene glycol was selected as a model reaction. The catalytic activities of these tungstosilicates were investigated. The results show that the introduction of large cation reduced the POM＇ s solubility, and the catalysts can be recycled and reused, so that their utilization can be improved. Moreover, the catalytic ac- tivities of these heterogeneous catalysts were almost unchanged after three cycles.
出处
《应用化工》
CAS
CSCD
北大核心
2015年第5期882-886,889,共6页
Applied Chemical Industry
基金
辽宁省自然科学基金(2013020128)
辽宁省教育厅科学研究基金(L2013414)
辽宁师范大学青年基金(2014)
