油菜花粉诱导合成多孔中空催化剂Nb2O5/TiO2及其在醇氧化反应中的应用

Rape pollen-induced Synthesis of Hierarchical Nb2O5/TiO2 and Its Application in Selective Oxidation of Alcohol

摘要:

采用油菜花粉为模板制备出了一种具有多孔中空结构的新型催化剂五氧化二铌/二氧化钛（Nb2O5/TiO2），它在光照条件下的醇氧化反应中表现出了良好的活性。反应可以在无溶剂条件下进行，以O2作为氧化剂，2,2,6,6-四甲基哌啶-N-氧自由基（TEMPO）为助催化剂，整个过程绿色环保，对环境友好。该体系下10 mL苯甲醇可以得到31 mmol的苯甲醛，收率为33%，选择性达98%。与单纯用TiO2作催化剂相比，由于新型催化剂的多孔结构及Nb2O5的存在，反应的选择性提高。

Abstract:

A novel catalyst Nb2O5/TiO2 with hierarchical structure was prepared using rape pollen as template, which exhibited good activity in oxidation of alcohols under photo irradiation. The reactions can be carried out under solvent-free conditions with O2 as oxidant and TEMPO (2,2,6,6-Tetramethyl-1-piperidinyloxy) as co-catalyst. The entire reaction process is green and environmentally friendly .The results show that 31 mmol benzaldehyde could be obtained from 10 mL benzyl alcohol. 33% of yield and 98% of selectivity were achieved in this catalytic system. Due to the hierarchical structure and existence of Nb2O5, selectivity improvement was achieved compared with that of bare TiO2.