摘要
分别以钨酸钠和钨酸铵为钨源、以正硅酸乙酯为硅源,分别采用直接合成法和后合成法制得W-SBA-15(x)和W/SBA-15(x)(x表示硅钨摩尔比),采用XRD,BET,NH3-TPD等分析手段对样品进行表征,并考察不同制备方法、不同WO3负载量以及焙烧温度、焙烧时间对样品吸附脱氮效果的影响。结果表明:直接合成法制备的W-SBA-15(20)和后合成法制备的W/SBA-15(20)都能很好地保留SBA-15的介孔结构,而直接合成法制备的W-SBA-15(10)使分子筛的有序结晶度明显变差;W-SBA-15(20)相对于W/SBA-15(20)和W-SBA-15(10)具有更好的吸附能力;当焙烧温度为550℃、焙烧时间为6h时,所制W-SBA-15(20)吸附剂的吸附脱氮效果最好,在反应温度为140℃、反应时间为30min、剂油质量比为1∶30的条件下,对喹啉的十二烷溶液模拟油的脱氮率为66.32%,饱和吸附量为25.66mg/g。
W-SBA-15（x）was synthesized by direct synthesis method using tetraethoxysilane（TEOS）as silica source and Na2WO4 as W source（xrepresent the mole ratio of W and Si）.The W/SBA-15（x）was prepared by post-synthesis method using prepared SBA-15 and ammonium tungstate solution.The samples were characterized by XRD,BET,and NH3-TPD.Effect of preparation method,WO3 loadings,calcination temperature and time on the performance of adsorptive denitrification was investigated.The results show that the mesoporous structure of SBA-15 can well be remained by both direct synthesis and post-synthesis methods.The ordered crystallinity of W-SBA-15（10）is worse.The denitrification performance of W-SBA-15（20）is better than W/SBA-15（20）and W-SBA-15（10）.The denitrification performance of W-SBA-15（20）is the best when the adsorbent was calcined at 550 ℃for6h.At the adsorption conditions of 140 ℃,30 min and absorbent/oil ratio of 1∶30,the denitrification rate of model oil,quinoline solution in dodecane,reaches 66.32% and the saturated absorption capacity is25.66mg/g.
出处
《石油炼制与化工》
CAS
CSCD
北大核心
2015年第8期76-80,共5页
Petroleum Processing and Petrochemicals
