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Celoria, Giorgio; Begni, Federico; Paul, Geo; Boccaleri, Enrico; Merlo, Valentino; Marchese, Leonardo; Bisio, Chiara
Processes, 01/2024, Letnik: 12, Številka: 1Journal Article
This manuscript deals with the synthesis of different types of zeolites from natural kaolinite samples for COsub.2 adsorption. A zeolite A was prepared from kaolinite by means of an alkaline fusion process, followed by hydrothermal treatment, whereas a highly crystalline zeolite X was synthesized by optimizing the previously mentioned synthetic procedure. In detail, the SiOsub.2/Alsub.2Osub.3 molar ratio in the preliminary mixture was modified with the addition of a secondary silicon source (sodium silicate) in order to obtain the one required for zeolites X. The physicochemical properties of the pristine clay and of the different zeolites were investigated by means of a multi-technique approach, including XRPD; SEM-EDX; sup.23Na, sup.27Al and sup.29Si MAS NMR spectroscopy; and Nsub.2 physisorption analysis at 77 K. Since the Si and Al molar ratios and reactivities are key parameters for the synthesis of zeolites, these aspects, primarily related to the use of a naturally occurring aluminosilicate as the raw material, have been investigated for their correlation with the physicochemical properties of the synthetic products. Moreover, by means of a custom-built volumetric apparatus, the COsub.2 adsorption capacity of the resulting zeolites at low gas pressures (<1 bar) and at 25 °C was assessed.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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