摘要
以Nb2O5为铌源直接合成Nb-SBA-15,通过X射线衍射(XRD)、氮气吸附脱附分析(BET)、红外光谱(FT-IR)、热重分析(DTA)表征手段对其结构进行分析。结果表明,铌负载于SBA-15后,仍保留SBA-15的高度有序的二维六方介孔结构。(Z)-Nb-SBA-15分子筛催化剂对苯乙烯氧化反应具有较高的催化活性,温度为70℃,n(苯乙烯)/n(过氧化氢)/n(丙酮)=1∶2∶2,催化剂质量为原料质量的10.0%的条件下反应10h,苯乙烯的转化率达到43.21%,苯甲醛的选择性为94.32%,且该催化剂稳定性较好,是性能良好的固体酸催化剂。
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.
出处
《石油化工高等学校学报》
CAS
2011年第1期48-51,58,共5页
Journal of Petrochemical Universities
