介孔Beta沸石的后处理法制备及其在合成2-乙基蒽醌中的催化性能

Preparation of Mesoporous Beta Zeolite by Post-synthesis Modification and Their Catalytic Performance in Synthesis of 2-Ethylanthraquinone

用先碱后酸的后处理方法制备了介孔Beta沸石催化剂,采用x射线粉末衍射、扫描电子显微镜、氮气吸脱附方法对催化剂进行了表征。结果表明,尽管碱处理样品的结晶度有一定程度的下降,但其含有丰富的介孔,具有大分子催化反应所需的良好的扩散传质效应。后续的柠檬酸处理除去碱处理操作产生的非骨架铝物种,所得催化剂在2-(4'-乙基苯甲酰基)苯甲酸(BE酸)脱水合成2-乙基蒽醌(2-EAQ)中具有比常规Beta沸石更好的催化性能。

Mesoporous Beta zeolite catalyst samples were prepared by sequential leaching-alkaline leaching-acid treatment and were characterized by means of XRD, N2 sorption, SEM. The results indicate that： The alkali treated sample containing rich mesopores had good diffusion effect favoring the large molecular catalytic reaction, although its crystallinity decreased; the following citric acid treatment facilitated the removal of non-framework aluminum species produced by alkali treatment operation, so the catalyst after leaching-acid treatment exhibited remarkably higher catalytic activity than did conventional zeolite Beta in the dehydration reaction of 2-（4＇-ethylbenzoy1）benzoic acid to 2-ethylanthraquinone（EAQ）.