直接合成Nb-SBA-15催化氧化苯乙烯

Direct Synthesis of Nb-SBA-15 for Catalytic Oxidation of Styrene

用直接合成法制备Nb-SBA-15介孔分子筛,并用XRD、BET、FT-IR和DTA测试手段对其进行分析。结果表明,Nb-SBA-15仍保留高度有序的介孔结构。以质量分数30%的H2O2为氧化剂,丙酮为溶剂,对Nb-SBA-15催化氧化苯乙烯反应进行了研究,试验得到较适宜工艺条件为:反应温度为70℃,反应时间为10 h,催化剂用量为原料质量的10.0%,n(苯乙烯)∶n(H2O2)∶n(丙酮)=1∶2∶2,苯乙烯的转化率可达43.21%,苯甲醛的选择性为94.32%。

Mesoporous molecular sieves Nb-SBA-15 were synthesized by direct synthesis,and characterized by XRD,BET,FT-IR and DTA.The results show that Nb-SBA-15 still retains a high ordered mesoporous structure of SBA-15.Using H2O2 as oxidant and acetone as solvent,catalytic oxidation of styrene to benzaldehyde were carried out over Nb-SBA-15,and the optimum conditions were obtained.When the reaction temperature is 70 ℃,the reaction time is 10 h,the amount of catalyst is 10.0% of the raw material,n（styrene）∶ n（hydrogen peroxide）∶ n（acetone） = 1∶ 2∶ 2,the conversion of styrene is up to 43.21%,and the selectivity of benzaldehyde is up to 94.32%.