Hollow octahedral NaP molecular sieve and preparation method thereof

Abstract

The invention discloses a hollow octahedral NaP molecular sieve and a synthesis method thereof, and belongs to the technical field of inorganic chemistry. The method comprises the following steps: preparing a reaction mixture solution from various idle or waste molecular sieves, sodium hydroxide and distilled water as raw materials, stirring at room temperature, transferring to a high-pressure reaction kettle, filling into a homogeneous reactor, crystallizing at 140-200 DEG C at the rotating speed of 15r / min, filtering, washing, drying and calcining to directly obtain the hollow octahedral NaP molecular sieve. The molecular sieve is a hollow octahedral molecular sieve (4-6 [mu] m) formed by stacking flaky NaP molecular sieves (300-600 nm), the shell thickness is 500-700 nm, and the molecular sieve has hierarchical pore characteristics and comprises octahedral core hollow macropores, mesopores formed by stacking the NaP molecular sieves on the shell and micropores of the NaP molecular sieves. The preparation process is simplified, special generation equipment and process requirements are avoided, the requirement of'green chemistry 'is met, and industrial production is facilitated.

Description

technical field [0001] This patent relates to a hollow octahedral NaP molecular sieve with multi-level pores and its one-step preparation method, which belongs to the technical field of inorganic chemical synthesis. Background technique [0002] Molecular sieves with a hollow structure have the characteristics of multi-level pores, including: hollow macropores in the core, mesopores formed by stacking molecular sieves on the shell, and micropores in the molecular sieve itself. Compared with a single microporous molecular sieve, the hierarchical pore structure not only endows the hollow structure catalyst with a lower packing density, accelerates the mass transfer of reactants and products, slows down the formation of carbon deposits, but also eliminates the metal group on the Oxide-Zeolite bifunctional catalyst. Surface enrichment of fractions. At the same time, after the inward diffusion of the reactants is transformed under the action of the shell active sites, the unreac...

AI Technical Summary

Problems solved by technology

However, the introduction of a large number of polymers and other additives in the above synthesis process will contaminate the formed hollow structure molecular sieve, thus limiting the application of this special structure in biology, medicine, etc.

Images