Synthesis of Pt modified ZSM-5 and beta zeolite catalysts:: Influence of ultrasonic irradiation and preparation methods on physico-chemical and catalytic properties in pentane isomerization
Synthesis of Pt modified ZSM-5 and beta zeolite catalysts:: Influence of ultrasonic irradiation and preparation methods on physico-chemical and catalytic properties in pentane isomerization
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DOI：
10.1016/j.ultsonch.2006.05.001
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发表时间：
2007-02-01
影响因子：
8.4
通讯作者：
Murzin, D. Yu.
中科院分区：
文献类型：
--
作者：
Kumar, N.;Masloboischikova, O. V.;Murzin, D. Yu.
采用原位法和浸渍法合成了Pt-ZSM-5和Pt-Beta催化剂，并将超声辐射应用于ZSM-5和Beta沸石的合成凝胶混合物，考察了制备方法和超声辐射对催化剂物化性能和催化性能的影响。通过对Pt-ZSM-5和Pt-Beta分子筛催化剂的X射线粉末衍射分析表明，原位法和超声辐照引入Pt对ZSM-5和Beta分子筛的结构没有影响。SEM照片显示，超声辐照原位合成的Pt-ZSM-5-IS-US催化剂比未超声辐照的Pt-ZSM-5-IS催化剂具有更小的ZSM-5晶粒。此外，超声辐照合成的Pt-Beta-11-IS-US沸石的SEM照片显示出比Pt-Beta-11-IM小得多的晶体，表明超声辐照对Beta沸石的形貌有显著影响。铂的原位引入高于没有超声辐射制备的催化剂。超声辐照原位合成的Pt-Beta-11-IS-US催化剂对异戊烷的选择性也高于浸渍法制备的Pt-H-Beta-11-IM催化剂。(C)2006 Elsevier B. V.保留所有权利。
Influence of preparation methods and ultrasound irradiation on physico-chemical and catalytic properties was investigated by synthesizing Pt-ZSM-5 and Pt-Beta catalysts by in-situ and impregnation methods and applying ultrasound irradiation to synthesis gel mixture of ZSM-5 and Beta zeolites. It was concluded from the X-ray powder diffraction patterns of Pt-ZSM-5 and Pt-Beta zeolite catalysts that introduction of Pt by in-situ method and ultrasound irradiation did not influence the structures of ZSM-5 and Beta zeolites.Morphology of ZSM-5 and Beta zeolites were investigated by scanning electron microscopy. SEM micrographs showed that the Pt-ZSM-5-IS-US catalyst synthesized by in-situ method with ultrasound irradiation resulted in smaller crystals of ZSM-5 than Pt-ZSM-5-IS catalyst prepared without ultrasound irradiation. Furthermore SEM micrographs of Pt-Beta-11-IS-US zeolite synthesized using ultrasound irradiation showed much smaller crystals than Pt-Beta-11-IM indicating that ultrasound irradiation had a significant effect on the morphology of Beta zeolite.Conversion of n-pentane and selectivity to iso-pentane over the Pt-ZSM-5-IS-US zeolite catalysts prepared by ultrasound irradiation during in-situ introduction of platinum was higher than the catalysts prepared without the ultrasound irradiation. Furthermore ultrasound irradiated and in-situ synthesized Pt-Beta-11-IS-US catalyst also showed higher selectivity to iso-pentane than Pt-H-Beta-11-IM prepared by impregnation method. (C) 2006 Elsevier B.V. All rights reserved.