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Synthesis of a new meso/microporous composite molecular sieve of MCM-41/mordenite

Chinese Science Bulletin 2005年第12期50卷 1180-1184页

作者： WANGShan DOUTao LIYuping ZHANGYing YANZichun LIXiaofeng instituteofspecialchemicals TaiyuanUniversityofTechnologyTaiyuan030024China instituteofspecialchemicals TaiyuanUniversityofTechnologyTaiyuan030024China//TheCNPCKeyLaboratoryofCatalysisUniversityofPetroleumBeijing102249China TheCNPCKeyLaboratoryofCatalysis UniversityofPetroleumBeijing102249China

An MCM-41/mordenite composite with two- fold porous structure and stepwise-distributed acidity was prepared for the first time by using zeolite mordenite as the silica-alumina source. The composite molecular sieve has been investigated and compared with a mechanical mixture of mordenite and MCM-41 for their structure, acidity and catalytic activity by means of XRD, N2 adsorption and desorption, HRTEM, DTG, NH3-TPD and catalytic reaction. The characterization results show that the structure and property of the composite molecular sieve are quite different from those of the mechanical mixture, which might be ascribed to the incorporation of secondary building units characteristic of zeolite mordenite into the mesoporous walls of the composite which gives rise to the thicker mesoporous walls, the higher hydrothermal stability and more strong acid sites. Furthermore, the new strategy could be used as a new general method for the preparation of catalysts for the reaction system with multifold large molecules, and the results were well confirmed by the dealkylation of C10+ aromatic hydrocarbon.

关键词：发光沸石合成分子网 MCM.41 二级建筑

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Preparation and properties of PVP-protected nanoparticles on zeolite Beta

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Chinese Science Bulletin 2003年第23期48卷 2577-2580页

作者： MAJinghong RENShuhua LIRuifeng LICan XIEKechang instituteofspecialchemicals TaiyuanUniversityofTechnologyTaiyuan030024China StateKeyLabofCatalysis DalianInstituteofChemicalPhysicsChineseAcademySciencesDalian116023China

Uniform shape platinum nanocrystals with narrow size distribution and controlled average dimension are successfully embedded in a polymeric matrix and sup-ported on zeolite Beta. The surface structure and reactivity of nanometalclusters are investigated by TEM, EXAFS, CO adsorption and methane activation. The results indicate that nanometalparticles in PVP-Pt/Beta materials have high sur-face activity and reactivity to activate methane even at tem-perature of 373K.

关键词：纳米材料沸石微观结构表面能量

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