不同碱源合成Ti-MCM-41及催化氧化-萃取脱除噻吩  

Synthesis of Ti-MCM-41 with Different Alkali Sources and its Catalytic Performance for Oxidation Desulfurization of Thiophene

作　　者：王广建[1] 张晋[1] 郭娜娜[1] 杨志坚[1] 

机构地区：[1]青岛科技大学化工学院,山东青岛266042

出　　处：《高校化学工程学报》2013年第3期532-537,共6页Journal of Chemical Engineering of Chinese Universities

基　　金：国家自然科学基金资助项目(21076110)

摘　　要：分别以NaOH、氨水、四甲基氢氧化铵为碱源,钛酸四丁酯为钛源,水热法合成了Ti-MCM-41介孔分子筛,采用SEM、XRD、TEM、FT-IR和BET等手段对合成分子筛进行了表征分析。研究了晶化时间、碱源、模板剂用量对结晶度及微观形貌的影响。结果表明:碱源类型对Ti-MCM-41的晶化过程及其孔道结构存在较大影响,碱源结构越稳定分子筛长程有序性越好。Ti-MCM-41对催化氧化噻吩显示出较高的催化活性,以乙腈为萃取剂时其氧化-萃取脱除率最佳,可达90.3%。萃取移除噻吩的效果与溶剂在体系中的结构适应性相关,实验采用溶剂萃取能力的顺序为:腈类>酰胺≥醇类>醇胺。Ti-MCM-41 mesoporous molecular sieves were synthesized by hydrothermal synthesis method with ammonia, NaOH, TMAH as alkali source, separately, and were characterized by SEM, XRD, TEM, FT-IR and BET techniques, respectively. The effects of crystallization time, species of alkali sources and template content on the crystallization process and the transformation of microstructures were investigated. The results suggest that the crystallinity and the ordering degree of the pore structural of Ti-MCM-41 are increased with the increase of the structure stability of the alkali source. The catalytic performance of the prepared Ti-MCM-41 in the catalytic oxidation-extraction process of thiophene with hydroperoxide as oxidant was studied. Ti-MCM-41 shows a relatively high catalysis effect on the oxidation of thiophene; with acetonitrile as solvent, the highest thiophene removal ratio can achieve 90.3%. The extraction processes of thiophene sulfoxide and sulphone are not only influenced by the polarity of extractants, but also related to the structural adaptation of the solvent in the system. The 3H structure in the solvent ofnitriles plays an important role in extracting process, the extract ability sequence of the solvent employed in the experiments is as follows： Nitriles 〉Amide〉Alcohols〉Alcohol amine.

关 键 词：介孔分子筛 TI-MCM-41 噻吩 催化氧化 模型柴油 

分 类 号：TQ426.61[化学工程] O643.36[理学—物理化学]