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The basicity and acidity of beta zeolites after ion-exchange with alkali metal cations: a physicochemical characterization

机译:与碱金属阳离子进行离子交换后,β沸石的碱度和酸度:理化特性

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摘要

The structure, basicity and acidity properties of the alkali metals (Na, K and Cs) exchanged zeolite beta were investigated in this work. Infrared (IR) and X-ray diffraction (XRD) were used for structural characterizations, while Temperature programmed desorption of CO2 and NH3 were use for the determination of basicity and acidity, respectively. Results reveal that the framework structure of zeolite beta is retained after the exchange but with a successive decrease in the relative crystallinity after the modification. The acidity of zeolite beta has decreased significantly with the decrease in the crystallinity. However, the basicity after the exchange was not very significant in comparison to the acidity. The effect of the crystallinity and the type of alkali metal cations on basicity is also shown.
机译:在这项工作中,研究了碱金属(Na,K和Cs)交换沸石β的结构,碱性和酸性性质。红外(IR)和X射线衍射(XRD)用于结构表征,而程序升温脱附的CO2和NH3分别用于测定碱度和酸度。结果表明,交换后沸石β的骨架结构得以保留,但改性后相对结晶度却不断降低。随着结晶度的降低,β沸石的酸度显着降低。但是,与酸度相比,交换后的碱度不是很显着。还显示了结晶度和碱金属阳离子的类型对碱度的影响。

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