Abstract
Two-dimensional SAPO-34 molecular sieves were synthesized by microwave hydrothermal process. The concentrations of structure directing agent (SDA), phosphoric acid, and silicon in the gel solution were varied and their effect on phase, shape, and composition of synthesized particles was studied. The synthesized particles were characterized by various techniques using SEM, XRD, BET, EDX, and NH3-TPD. Various morphologies of particles including isotropic, hyper rectangle, and nanoplates were obtained. It was found that the Si/Al ratio of the SAPO-34 particles was in a direct relationship with the density of acid sites. Moreover, the gel composition and preparation affected the chemistry of the synthesized particles. The slow addition of phosphoric acid improved the homogeneity of synthesis gel and resulted in SAPO-34 nanoplates with high density of acid sites, 3.482 mmol/g. The SAPO-34 nanoplates are expected to serve as a high performance catalyst due to the low mass transfer resistance and the high density of active sites.
Highlights
IntroductionPublisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations
The prime objective of this study is to synthesize SAPO-34 nanoplates with a high
Si/Al ratio and improved Si incorporation, which is directly related to the density of acid sites, in other words, the catalytic activity
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. If phosphorus is replaced by silicon in the structure, silicoaluminophosphate (SAPO) with a negative charge and Brønsted activity is obtained [1,2]. These molecular sieves have a molecular formula of Six Aly Pz O2 where x = 0.01–0.98, y = 0.01–0.60, z = 0.01–0.52, and x + y + z = 1 [3]. Many different SAPOs having a wide variety of structures, including AEI, AFI, and CHA have been reported by researchers [4]. SAPO-34 has a [5,6,7]
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