Preparation of Zeolite—metal Composite Membrane

A NaA Zeolite membrane was synthesized on the surface of the stainless steel slab. The membrane was characterized by XRD and SEM. The membrane was continuous and highly intergrown. The size of NaA zeolite crystals was about 5-6μm.     

预涂布晶种法合成无缺陷A型分子筛膜的研究

采用一种颗粒度约为200nm的胶态A型分子筛为晶种源,对晶种层进行特殊的蒸气处理后,进一步采取原位水热晶化法,在多孔氧化铝载体表面制备出A型分子筛膜。膜分子筛以特殊的孪生聚晶形式生长在一起,可有效地消除晶粒间隙,形成致密的分子筛膜层。晶化反应液的碱度对A型分子筛膜的质量影响很大,低碱度更有利于A型分子筛膜的生长。在对分子筛膜进行高温活化处理过程中产生一些缺陷孔,降低了膜气体分离性能。     

Nafion／SiO2 Nanocomposties：High Potential Catalysts for Alkylation of Benzene with Linear C9—C13 Alkenes

High surface area Nafion/SiO2 nanocomposites with nano-sized Nafion resin particles entrapped and dispersed within the highly porous silica matrix exhibited significantly enhanced activity,high sclectivity and long-term stability for the alkylation of benzene with lincar C9-C13 alkenes owing to the increased accessibility of Nafion resin-based acid sites to reactants.     

真空原位水热合成法快速合成A型分子筛膜

采用真空原位水热法在管状αAl2O3基膜上快速合成了A型分子筛膜;采用XRD和SEM方法表征了膜的性质;研究了真空度对A型分子筛膜性能的影响。在外加真空作用下,分子筛晶粒可以均匀、快速地迁移到基膜表面形成分子筛膜,从而可以在较短时间里合成均匀、连续的分子筛膜。     

大连化物所合成工业用A型分子筛膜

不久前，中国科学院大连化物所杨维慎研究员领导的研究组采用在多孔氧化铝基体表面预涂晶种并在凝胶体系中合成的方法，合成纯度高、完整性好的NaA型分子筛膜。这种NaA型分子筛膜的H2／n—C4H10、H2／N2和O2／N2理想分离系数分别为106、20．1和2．61，具有很好的工业应用筛分效果。     

Surface Acidity／Basicity and Catalytic Reactivity of CeO2／γ—A12O3 Catalysts for the Oxidative Dehydrogenation of Ethane with Carbon Dioxide to Ethylene

Dehydrogenation of ethane to ethylene in CO2 was investigated over CeO2/γ-Al2O3 catalysts at 700℃ in a conventional flow reactor operating at atmospheric pressure. XRD, BET and microcalorimetric adsorption techniques were used to characterize the structure and surface acidity/basicity of the CeO2/γ-Al2O3 catalysts. The results show that the surface acidity decreased while the surface basicity increased after the addition of CeO2 to γ-Al2O3. Accordingly, the activity of the hydrogenation reaction of CO2 increased, which might be responsible for the enhanced conversion in the dehydrogenation of ethane to ethylene. The highest ethane conversion obtained was about 15% for the 25?O2/γ-Al2O3. The selectivity to ethylene was high for all the CeO2, γ-Al2O3 and CeO2/γ-Al2O3 catalysts.