Hierarchical meso-/microporous lamellar zeolites couple the catalytic features of micropores and the improved access and transport consequence of mesopores in a single material, possessing the capacity of processing large molecules. The synthesis and catalytic behavior investigation of lamellar zeolite structures has become the subject of intense research. This talk highlights our recent research on the synthesis and catalytic characterizations of lamellar zeolite composites, with a focus on tailoring their catalytic performances using a simple one-step dual template synthesis strategy. By tuning the molar ratio of dual templates in the synthesis, the textural properties of the lamellar zeolite composites can be systematically tailored.  Implications of the tunable internal micropore-external surface on the spatial distribution and catalytic performance of interal-external acid sites in the composite zeolite catalysts have been studied using organic chemical titration, x-ray photoelectron spectroscopy and alkylation reactions. Volcano-type dependence between the hierarchy factor, distribution of internal-external acid sites and alkylation reaction rate with the dual template ratios in the hydrothermal synthesis suggest that the textural and composition properties and thus the catalytic performance of the catalysts can be optimized by the designed zeolite synthesis. The ability to form hierarchical lamellar zeolites with tunable acid site distribution is important to keep their potential applications as broad as possible for a specific zeolite structure.

One-step dual template synthesis and catalytic characterization of hierarchical lamellar zeolite composite materials

254th National Meeting (2017)

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