摘要
分别以白炭黑为硅源，四乙基氢氧化铵为模板剂，硫酸钛为钛源，氯化钴为钴源，氟化铵为矿化剂，采用水热合成法在Si02-CoO-TiO2-（TEA）2O—H2O—NH4F体系中合成了Ti-Co-β沸石，运用XRD、IR和SEM等技术对样品进行了表征，并探讨了影响Ti-Co-β沸石合成的因素．结果表明，按化学组成（物质的量的比）SiO2：CoO：TiO2：（TEA）2O：H2O：NH4F=60：（0．5—3．0）：（0．5—3．0）：（16—18）：（500—650）：（30～40）配制初始反应混合物，可制备出结晶良好的Ti-Co-β沸石，合成的样品具有BEA拓扑结构，Ti和Co两种原子进入了沸石骨架．在以H2O2为氧化剂的氧化苯乙烯的反应中，考察了Ti-Co-β沸石的催化氧化性能，苯乙烯的转化率和苯甲醛的选择性分别可达71．3％和93．4％．
Ti-Co-β zeolite was synthesized under hydrothermal conditions with fumed silica（ SiOz） as the sili- ca source, tetraethyl ammonium hydroxide（TEAOH） as the template, titanium sulfate as the titanium source, cobalt chloride as the cobalt source , ammonium fluoride as a mineralizing agent,Ti-Co-β zeolite was hydrothermally synthesized in a SiO2-CoO-TiO2-（TEA） 20-H2O-NH4F system. The structure and chemical composition of the products were determined by X-ray diffraction, infrared spectroscopy and scanning electron microscopy. The effects of various factors on the synthesis of Ti-Co-β zeolite have been investigated. The results indicate that the well-crystallized Ti-Co-β zeolite can be synthesized from the precursor with the TiO2： CoO： V205： （TEA）20： H20： NH4F molar ratio of60：（0.5 -3.0）： （0. 5 -3.0）： （16 -18）： （500 -650）： （30 -40）, and the Ti and Co atoms present in the framework of the zeolite. The catalytic behavior of Ti-Co-β zeolite in oxidation of styrene using H2O2as the oxidant was investigated. The phenylethylene conversion is 71.3% , and the selectivity of benzaldehyde is about 93.4%.
出处
《湖南师范大学自然科学学报》
CAS
北大核心
2014年第2期40-46,共7页
Journal of Natural Science of Hunan Normal University
基金
湖南省自然科学基金资助项目(No.08BJJ3026)
