Honeycomb type molecular sieve-activated carbon compound adsorbent, preparation method and application thereof

Abstract

The invention provides a honeycomb type molecular sieve-activated carbon compound adsorbent, a preparation method and an application thereof. The honeycomb type molecular sieve-activated carbon compound adsorbent is prepared according the following steps: mixing 20-70 parts of Y-shaped molecular sieve, 28-69 parts of activated carbon powder, 5-10 parts of expanded graphite, 3-6 parts of silica sol, 3-8 parts of organic adhesive and 60-150 parts of deionized water, refining mud, performing vacuum pugging, ageing, performing honeycomb extruding molding, performing low-temperature microwave molding and performing microwave vacuum sintering. Compared with the prior art, the honeycomb type molecular sieve-activated carbon compound adsorbent provided by the invention has the advantages of difficulty in cracking, high strength, high aperture ratio, low water content (less than 3%), water resistance, inflaming retarding and the like; as a VOCs absorbent, the honeycomb type molecular sieve-activated carbon compound adsorbent can consider the adsorption for molecules in different polarities and sizes and shows an excellent adsorption capacity, such as xylene adsorption capacity of less than 400mg / g and polar formaldehyde adsorption capacity of less than 20mg / g; the thermal regeneration performance is excellent; the desorption can reach up to 98% or above.

Description

technical field [0001] The invention belongs to the field of adsorption materials, and in particular relates to a honeycomb molecular sieve-activated carbon composite adsorbent, a preparation method and application thereof, as a VOCs adsorbent. Background technique [0002] Excessive emissions of volatile organic compounds (VOCs) will have a serious impact on the natural environment and human health. Pollution is common in petrochemical, pharmaceutical, automotive, rubber, paint and coating industries. With the people's increasing attention to the environment and health, and the country's increasingly stringent environmental protection requirements, VOCs pollution control has a large market and potential. [0003] At present, around VOCs pollution control, according to the site and pollution characteristics and whether it is reused or not, there are a variety of treatment technologies. Common technologies include: physical condensation, combustion and catalytic combustion, c...

AI Technical Summary

Problems solved by technology

However, due to the low specific surface area of ​​natural clay itself and the need for high-temperature sintering, it often leads to a decrease in the specific surface area of ​​honeycomb activated carbon and a decrease in the adsorption capacity.

[0008] In summary, it can be found that honeycomb activated carbon is an ideal material for the adsorption and treatment of VOCs, but the adsorption capacity for large polar small molecule VOCs, such as formaldehyde, ethanol, acetic acid, etc., is extremely low, and due to the low strength of activated carbon itself, high temperature It is flammable and difficult to shape. Activated carbon without corresponding treatment often presents problems such as easy pulverization, low strength, and poor water tolerance.