Honeycomb ceramic-based fine-particle-size NaA molecular sieve block adsorbent and in-situ synthesis method and application

Abstract

The invention belongs to the technical field of block adsorbent, and discloses a honeycomb ceramic-based fine-particle-size NaA molecular sieve block adsorbent, and an in-situ synthesis method and application. The method comprises the following steps: (1) forming ceramic fiber paper coated with silicone sol, and obtaining a honeycomb cylinder; soaking in an alkaline-earth metal salt solution, drying, and sintering to obtain a honeycomb ceramic green body; (2) enabling the honeycomb ceramic green body to be soaked in a suspension of NaA molecular sieve seed crystal to obtain soaked green body; (3) preparing an aluminum source, a silicon source, sodium hydroxide and water into molecular sieve synthetic slurry; and (4) enabling the soaked green body to be immersed in the synthetic slurry, crystallizing by virtue of microwaves, cooling, washing, and activating to obtain the block adsorbent. The in-situ synthesized NaA molecular sieve is tightly combined with the honeycomb ceramic green body, so that the service life of the adsorbent is prolonged; and meanwhile, crystal particles of a molecular sieve are fine in size and uniform in distribution, and the prepared adsorbent has good adsorption performance.

Description

technical field [0001] The invention relates to a gas adsorption drying purification and heat recovery technology, in particular to a honeycomb ceramic-based NaA molecular sieve block adsorbent with fine particle size and its in-situ synthesis method and application. Background technique [0002] The honeycomb ceramic-based dehumidification block adsorbent (dehumidification core) constructed by the organic combination of ceramic fibers and block adsorbents can be applied to adsorption dehumidification wheels and total heat recovery systems. Among them, the dehumidification rotor is the core of the system, and its performance determines the energy efficiency of the system. The evaluation of the performance of the dehumidification rotor mainly includes two aspects: (1) the preparation process of the composite of the block adsorbent and the substrate, the preparation process affects the service life of the dehumidification rotor, and then affects the dehumidification performanc...

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Problems solved by technology

However, the existing honeycomb ceramic-based NaA molecular sieve is still insufficient as a dehumidification core: (1) In the preparation process, the honeycomb ceramic-based embryo body made of ceramic paper is usually used as the base material, and the industrial molecular sieve (particle size 2-5 μm) is Block adsorbent, and inorganic glue or organic / inorganic composite glue as adhesive, bonded by dip coating method

Since the addition of the binder will block the pores of the molecular sieve, the dehumidification capacity will be reduced; moreover, the particle size of the molecular sieve is large, and the force between the block adsorbent and the substrate and the binder is small, and the long-term The rotation of the runner and the adsorption and desorption process of the block adsorbent are prone to powder falling, which affects its service life and adsorption performance

(2) Due to the large particle size and small specific surface area of ​​industrial molecular sieves, their early adsorption rate and equilibrium adsorption capacity are relatively low. In addition, the desorption temperature of NaA molecular sieves with adsorption type I is relatively high, which has an impact on system energy saving

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