Direct Synthesis of Nb-SBA-15 and the Catalytic Oxidation Performance of Styrene

Niobium-containing mesoporous molecular sieves Nb-SBA-15 were synthesized by using Nb2O5 as niobium source.The molecular sieves were characterized by means of small angle XRD,BET,FT-IR,DTA.The results show that with niobium loaded on SBA-15,it possess characteristic structure of SBA-15.The(Z)-Nb-SBA-15 molecular sieve catalyst has a high catalytic activity for the oxidition of styrene,at the temperature 70 ℃,n(styrene)/n(H2O2)/n(acetone)= 1∶2∶2,the quantity of catalyst was 10.0% of the raw material,reaction time 10 h,the conversion of styrene is up to 43.21%,the selectivity of benzaldehyde is up to 94.32%,and the catalyst has good stability,is a preferred solid acid catalyst.