Three-dimensional fiber-based aerogel catalyst carrier and preparation method thereof

Abstract

The invention relates to a preparation method of a three-dimensional fiber-based aerogel catalyst carrier and a product thereof. The preparation method comprises the following steps of: firstly dispersing fibers in solvents to form turbid liquid; secondly curing the turbid liquid to form cured pieces; thirdly removing cured solvents to form non-crosslinked fiber-based aerogel; finally carrying out crosslinking stabilization treatment and then carrying out activation treatment, thus obtaining the three-dimensional fiber-based aerogel catalyst carrier. The product is a three-dimensional network-shaped material formed through mutual penetration and stagger of fibers. The fiber crossing points are effectively interconnected through non-hydrogen-bond bonding. The three-dimensional fiber-based aerogel catalyst carrier has volume density of 0.1-500mg / cm<3>, average pore size of 0.01-2000mu m and specific surface area of 0.2-2000m<2> / g. The preparation method and the product have the advantages that the preparation process is simple; the raw material limitations are less; and the aerogel catalyst carrier product has good flexibility, connectivity and catalyst supporting capacity and has broad application prospects in the catalytic application field.

Description

technical field [0001] The invention relates to a three-dimensional fiber-based airgel catalyst carrier and a preparation method thereof, belonging to the field of fiber functional materials. Background technique [0002] Airgel is a highly dispersed solid material obtained by replacing the liquid in the wet gel with gas by a certain method while keeping the network structure of the gel basically unchanged. It is one of the solid materials with the lowest density known so far. . Airgel can be divided into inorganic aerogel, organic aerogel and inorganic / organic composite aerogel according to different components. At present, its preparation process is mainly sol-gel process and supercritical drying treatment. Kistler first prepared aerogels in the 1930s, and pointed out that aerogels have potential application value in catalysts and catalyst supports because of their high porosity, specific surface area, and open woven structure. Using the airgel material as the catalyst c...

AI Technical Summary

Problems solved by technology

Domestic patent CN1836779 and U.S. patent US5972254 respectively disclose a preparation method of a microfiber structured three-dimensional porous composite material capable of supporting catalysts and a preparation method of an ultrafine fiber reinforced honeycomb airgel catalyst carrier. The catalyst supports are all materials doped with fibers, in which the fibers are only used as reinforcing components, and the obtained materials are essentially particle-type aerogels, so there are still problems of high brittleness, poor pore connectivity, and low media transport efficiency. defect

In addition, the above-mentioned methods all need to prepare the inorganic precursor sol first, which has the disadvantages of complex preparation process, high energy consumption, and narrow range of raw material selection.

Therefore, the methods disclosed in the above patents are difficult to realize the effective preparation of new high-efficiency, low-cost three-dimensional fiber-based airgel catalyst supports.