Hollow TS-1 mesocrystals: hydrothermal construction and high catalytic performances in cyclohexanone ammoximation

Abstract

In this article, solid and hollow TS-1 mesocrystals (HTMs) with hierarchical porous structure were constructed through assembling TS-1 nanocrystalline block in hydrothermal post-treatment. TS-1 nanocrystalline blocks including organic template reagent provided solid TS-1 mesocrystals. Preremoval of template offered HTMs. In cyclohexanone ammoximation, the catalytic activity of HTMs depended 10 significantly on their hollow mesocrystalline structure. Compared to solid TS-1 mesocrystals, HTMs showed excellent catalytic performance with cyclohexanone conversion and oxime selectivity up to 100%. The hollow mesocrystalline structures of TS-1 contribute to their high surface area, hierarchical porous, robust structure and corresponding catalytic performances.

Hybrid Chemo-Biocatalysts Prepared in One Step from Zeolite Nanocrystals and Enzyme-Polyelectrolyte Complexes

“…As prepared titanium silicalite (TS-1) zeolites can be described as nanocrystals with dimensions between 100 and 150 nm ( Figure S2 A), consistent with the size reported in the literature for such synthesis protocols (79,80). The microspheres obtained by the aggregation of these TS-1 nanocrystals via spray drying (Aer_TS-1) consist in spherical particles with a size ranging from 0.8 to 5 µm (Figure 1 A-B).…”

Seed-assisted synthesis of TS-1 crystals containing Al with high catalytic performances in cyclohexanone ammoximation

“…The rst effective strategy was to enlarge the size of the b-axis micropores; then, hierarchical TS-1 materials were synthesized using the mesopore template, [12][13][14] and hierarchical porous structures were constructed by treating the TS-1 zeolite with organic bases. [15][16][17] The second measure was to decrease the crystal size or reduce the b-axis depth; then, the diffusion limitations would be alleviated or even eliminated. The seedassisted syntheses of zeolites could induce rapid nucleation, shorten crystallization time and decrease the zeolite crystal size.…”

Hierarchical Shell‐Like ZSM‐5 with Tunable Porosity Synthesized by using a Dissolution–Recrystallization Approach

“…Furthermore, the dispersed mesopores inside zeolite crystal, which are separated from each other, can only lead to a rather modest diffusion improvement . Hollow zeolites, which have attracted great attention in the field of catalysis in recent years, are another choice to solve the diffusion problem, owing to the short diffusion path . Hollow TS‐1 is one of the most successful examples as it shows great performance in the production of cyclohexanone oxime in industry.…”

“…[27] Hollow zeolites, which have attracted great attention in the field of catalysis in recent years, are another choice to solve the diffusion problem, owing to the short diffusion path. [28][29][30] Hollow TS-1 [28] is one of the mosts uccessful examplesa si ts hows great performance in the production of cyclohexanone oxime in industry.T ypically,Z SM-5 zeolites can be treated in tetrapropylammonium hydroxide (TPAOH) solution under hydrothermalc onditions to gain ah ollow structure. Dissolution will occur inside and at the same time there is recrystallization on the external surface.…”