Abstract
Nano-zeolite with brain-coral morphology formed by self-organization of ultra-small nanospheres, exhibits micro/meso porosity with high surface area, distributed acid sites, and reduced diffusion resistance making it a promising solid acid catalyst.
Highlights
We report here the synthesis of nano-zeolite, viz., ZSM-5 with MFI topology, having a unique brain-coral morphology, designated as n-ZSM-5
We report the successful synthesis of nano-zeolite, designated as n-ZSM-5, in the absence of mesoporogens under the designed synthesis conditions (Fig. 1).[28]
It is noteworthy to point out here that the sample n-ZSM-5 (Fig. 2a), as expected, showed broad reflections to those of cZSM-5 (Fig. 2b) which can be ascribed to its smaller crystallite size
Summary
The performance of these zeolitic structures owing to the significant change in the physico-chemical properties.[3,4] regulating the growth of zeolites to nano dimensions is a challenging task owing to the highly alkaline synthesis conditions, which results in uncontrolled crystal growth and aggregation of crystals.[5]. The unit cell of a pure silica zeolite with the MFI framework type was optimized using a set of fixed volume calculations.[38] The optimized cell parameters were 20.296, 19.954 and 13.368 Å for the vectors a, b and c respectively, in close agreement with the experimentally reported values.[39] The slab model was used to study the external surface of the zeolite (Fig. S4‡), with the vectors a and c parallel to the plane of the slab and the b vector along the normal direction to the slab surface.[40] The cleaved Si–O bonds at the surface were saturated with OH groups, forming silanol groups. The binding energy of NH3 to the different active sites was calculated by subtracting the energy of NH3 in the gas phase plus the bare zeolite structure from the system where the zeolite is loaded with NH3
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