CN-121534753-B - Porous recrystallized silicon carbide-based catalytic module and preparation method and application thereof

CN121534753BCN 121534753 BCN121534753 BCN 121534753BCN-121534753-B

Abstract

The invention provides a porous recrystallized silicon carbide-based catalytic module, and a preparation method and application thereof, and belongs to the technical field of catalytic materials. The porous recrystallized silicon carbide-based catalytic module comprises a carrier and an active component loaded on the carrier, wherein the carrier is porous recrystallized silicon carbide, and the active component comprises a metal simple substance active component and/or a metal oxide active component. The porous recrystallized silicon carbide-based catalytic module provided by the invention takes porous recrystallized silicon carbide as a carrier, has high porosity, large specific surface area and excellent corrosion resistance, and has excellent catalytic effect and long service life.

Inventors

REN JIANG
LIU CHANGCHUN
REN YUN
HAO JIANLIANG
SUN PENGJIN
Dai Weifan

Assignees

沈阳星光新材料有限公司

Dates

Publication Date: 20260508
Application Date: 20260119

Claims (7)

1. The preparation method of the porous recrystallized silicon carbide-based catalytic module is characterized in that the porous recrystallized silicon carbide-based catalytic module consists of a carrier and an active component loaded on the carrier, wherein the carrier is porous recrystallized silicon carbide, the pore diameter of the porous recrystallized silicon carbide is 0.05-10 mu m, the porosity is 45-85%, and the specific surface area is 18-80 m 2 /g; The preparation method comprises the following steps: Mixing silicon carbide, cellulose, glucan, vegetable oil and glycerol with water to obtain slurry, wherein the slurry comprises 65-70% of first silicon carbide, 4-6% of cellulose, 1.5-2.5% of glucan, 0.5-1.5% of vegetable oil, 1.5-2.5% of glycerol and the balance of water, the particle size of the first silicon carbide is 0.1-15 mu m, and the silicon carbide with the particle size of 10+/-1 mu m in the first silicon carbide accounts for more than 50% of the total mass of the first silicon carbide; extruding and molding the slurry to obtain a blank; Drying and first sintering the green body to obtain a first sintered body, wherein the temperature of the first sintering is 2440-2460 ℃, and the heat preservation time is 1-3 h; Carrying out first film coating treatment on the first sintered body by adopting a first film coating reagent to obtain a first film coated sintered body, wherein the first film coating reagent comprises 65-70% of second silicon carbide, 4-6% of cellulose, 1.5-2.5% of glucan, 0.5-1.5% of vegetable oil, 1.5-2.5% of glycerol and the balance of water, the particle size of the second silicon carbide is 0.1-15 mu m, and the silicon carbide with the particle size of 5+/-0.5 mu m in the second silicon carbide accounts for more than 50% of the total mass of the second silicon carbide; The first film-coated sintered body is subjected to second sintering, the material obtained after the second sintering is subjected to second film-coating sintering to obtain porous recrystallized silicon carbide, the second sintering temperature is 2190-2210 ℃, the heat preservation time is 1-3 h, the second film-coating sintering comprises sequentially performing second film treatment and third sintering, film reagents used in the second film treatment comprise third silicon carbide 65-70%, cellulose 4-6%, glucan 1.5-2.5%, vegetable oil 0.5-1.5%, glycerol 1.5-2.5% and the balance water, the particle size of the third silicon carbide is 0.1-15 mu m, and the particle size of silicon carbide in the third silicon carbide is 0.6+/-0.1 mu m accounts for more than 50% of the total mass of the third silicon carbide; and taking the porous recrystallized silicon carbide as a carrier, and loading an active component on the carrier to obtain the porous recrystallized silicon carbide catalytic module.
2. The method of claim 1, wherein the porous recrystallized silicon carbide based catalyst module has a loading of active component of 1-20wt%.
3. The method of claim 1, wherein the active component forms an active layer on the support, the active layer having a thickness of 0.1 to 10 μm.
4. The method according to claim 1, wherein the porous recrystallized silicon carbide has a foam-like structure, a honeycomb-like structure or a corrugated structure, and the porous recrystallized silicon carbide has a macroscopic shape including a plate-like, columnar or tubular shape.
5. The preparation method of the porous recrystallized silicon carbide according to claim 1, wherein the second film-sintering process further comprises performing third film-sintering on a material obtained after third sintering to obtain the porous recrystallized silicon carbide, wherein the third film-sintering process comprises sequentially performing third film treatment and fourth sintering, and a film reagent used for the third film treatment comprises 65-70% of fourth silicon carbide, 4-6% of cellulose, 1.5-2.5% of glucan, 0.5-1.5% of vegetable oil, 1.5-2.5% of glycerol and the balance of water, wherein the particle size of the fourth silicon carbide is 0.1-15 mu m, and the silicon carbide with the particle size of 0.5+/-0.07 mu m in the fourth silicon carbide accounts for more than 50% of the total mass of the fourth silicon carbide.
6. The porous recrystallized silicon carbide-based catalytic module prepared by the preparation method of any one of claims 1 to 5.
7. The use of the porous recrystallized silicon carbide based catalytic module of claim 6 in catalytic ozonation of sewage, catalytic hydrogenation reaction, indoor air purification or catalytic decomposition of soot.

Description

Porous recrystallized silicon carbide-based catalytic module and preparation method and application thereof Technical Field The invention relates to the technical field of catalytic materials, in particular to a porous recrystallized silicon carbide-based catalytic module, and a preparation method and application thereof. Background The carrier material in the supported catalyst has an important influence on the catalytic effect of the active components and the service life of the catalyst. The carrier material in the supported catalyst mainly comprises activated carbon, alumina or diatomite, but has the problem of poor corrosion resistance. Silicon carbide materials have improved corrosion resistance over the above-mentioned support materials, and have excellent high-temperature stability, high mechanical strength, good thermal conductivity, and low thermal expansion coefficient, and are considered as ideal catalyst support materials. However, the traditional silicon carbide material is usually prepared by a reaction sintering process, the product density is high, the porosity is low (about 10%), the specific surface area is small (< 7m 2/g), and the free silicon is more, so that the corrosion resistance of the silicon carbide material can be reduced, and the requirements of industrial catalytic reaction on high specific surface area and corrosion resistance can not be met. Disclosure of Invention The invention aims to provide a porous recrystallized silicon carbide-based catalytic module and a preparation method and application thereof, the porous recrystallized silicon carbide-based catalytic module provided by the invention takes porous recrystallized silicon carbide as a carrier, the porous recrystallized silicon carbide-based catalytic module has the advantages of high porosity, large specific surface area and excellent corrosion resistance, and has excellent catalytic effect and long service life. In order to achieve the above object, the present invention provides the following technical solutions: The invention provides a preparation method of a porous recrystallized silicon carbide-based catalytic module, which comprises a carrier and an active component loaded on the carrier, wherein the carrier is porous recrystallized silicon carbide, and the active component comprises a metal simple substance active component and/or a metal oxide active component; The preparation method comprises the following steps: Mixing silicon carbide, cellulose, glucan, vegetable oil and glycerol with water to obtain slurry, wherein the slurry comprises 65-70% of first silicon carbide, 4-6% of cellulose, 1.5-2.5% of glucan, 0.5-1.5% of vegetable oil, 1.5-2.5% of glycerol and the balance of water, the particle size of the first silicon carbide is 0.1-15 mu m, and the silicon carbide with the particle size of 10+/-1 mu m in the first silicon carbide accounts for more than 50% of the total mass of the first silicon carbide; extruding and molding the slurry to obtain a blank; Drying the blank body and performing first sintering to obtain a first sintered body; Carrying out first film coating treatment on the first sintered body by adopting a first film coating reagent to obtain a first film coated sintered body, wherein the first film coating reagent comprises 65-70% of second silicon carbide, 4-6% of cellulose, 1.5-2.5% of glucan, 0.5-1.5% of vegetable oil, 1.5-2.5% of glycerol and the balance of water, the particle size of the second silicon carbide is 0.1-15 mu m, and the silicon carbide with the particle size of 5+/-0.5 mu m in the second silicon carbide accounts for more than 50% of the total mass of the second silicon carbide; Performing second sintering on the first film-coated sintered body to obtain the porous recrystallized silicon carbide; and taking the porous recrystallized silicon carbide as a carrier, and loading an active component on the carrier to obtain the porous recrystallized silicon carbide catalytic module. Preferably, the metal simple substance active component comprises one or more of platinum, palladium, ruthenium, gold, silver, copper, nickel, cobalt and molybdenum, and the metal oxide active component comprises one or more of iron oxide, molybdenum oxide, zirconium oxide, cerium oxide, manganese oxide, copper oxide, cobalt oxide, titanium oxide and vanadium oxide. Preferably, the loading of the active component in the porous recrystallized silicon carbide-based catalyst module is 1-20wt%. Preferably, the active component forms an active layer on the carrier, and the thickness of the active layer is 0.1-10 μm. Preferably, the porous recrystallized silicon carbide comprises a foam structure, a honeycomb structure or a corrugated structure, the macroscopic shape of the porous recrystallized silicon carbide comprises a plate shape, a column shape or a tube shape, the pore diameter of the porous recrystallized silicon carbide is 0.05-10 mu m, the porosity is 45-85%, and the specific surface area is 18