Porous granular molecular sieve VOCs adsorbent and preparation method thereof

Abstract

The invention relates to a preparation method of a porous granular molecular sieve VOCs adsorbent. The method is characterized by comprising the following steps: adding 50-55 parts of HY molecular sieve powder, 5-10 parts of kaolin, 1-3 parts of a pore-forming agent auxiliary agent, and 1-3 parts of a pore forming agent; immersing CuNiO2/MS metal oxide obtained after impregnation, air atmosphere roasting, reducing atmosphere roasting and oxidizing atmosphere roasting in a composite solution of sodium alginate and pullulan, and performing ultrasonic treatment for 10-15 s. The CuNiO2/MS metal oxide subjected to impregnation, air atmosphere roasting, reducing atmosphere roasting and oxidizing atmosphere roasting is subjected to reduction treatment and then oxidation treatment, so that the CuNiO2/MS metal oxide has relatively strong reducing capacity and is easy to regenerate; a channel for conveying the adsorption gas is left after the thermal decomposition process of the auxiliary agent and the pore-forming agent auxiliary agent, so that the situation that the adsorbent structure is broken due to structural stress concentration caused by gas wrapping is avoided; and the VOCs adsorbent is coated with a composite membrane, and the repression and combination effects of the composite membrane are enhanced through short-time microwave treatment.

Description

Technical field: [0001] The invention belongs to the technical field of adsorbents, and more specifically relates to a porous granular molecular sieve VOCs adsorbent. Background technique: [0002] Volatile organic compounds (VOCs) refer to various organic compounds with a boiling point of 50°C to 260°C under normal pressure. According to their chemical structure, VOCs can be further divided into: alkanes, aromatics, esters, aldehydes and others Wait. More than 300 species have been identified so far. The most common ones are benzene, toluene, xylene, styrene, trichloroethylene, chloroform, trichloroethane, diisocyanate (TDI), diisocyanocresyl, etc. [0003] Among the VOCs purification treatment technologies, the adsorption method has the advantages of simple process, strong operability, low energy consumption, safety and environmental protection, and is currently the most widely used VOCs purification method. Activated carbon is a traditional adsorbent for purifying VOCs...

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Problems solved by technology

However, due to the inhomogeneity of the pore structure of activated carbon and the nature of the adsorption functional groups on the surface, the adsorption selectivity for VOCs is not high; the internal capillary pore structure of activated carbon is easily blocked in the adsorption application, thereby reducing the adsorption capacity, and the regeneration is difficult to complete. The adsorption capacity decays quickly and the service life is short. Usually, new activated carbon needs to be replaced in a few months (3-6 months). In addition, activated carbon has a spontaneous combustion phenomenon due to the high desorption temperature during the regeneration process of adsorption and purification of VOCs, which is easy to cause Safety issues such as combustion and explosion

[0004] In particular, during the long-term storage of the existing adsorbents, due to the deterioration of the environment, the adsorbents have strong activity, which leads to the failure of the adsorbents before use.

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