Adsorption/catalysis material for waste gas treatment and preparation method thereof
A technology for waste gas treatment and catalytic materials, which is applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc. It can solve the problems of easy peeling off of molecular sieve active coating, low carrier specific surface area, and molecular sieve active coating loading capacity. Low-level problems, to achieve the effect of good catalytic reduction ability, high specific surface area, and good exhaust gas treatment effect
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[0033] The following describes the preparation method of the adsorption / catalytic material for waste gas treatment according to the present invention, and the preparation method comprises the following steps:
[0034] a. Pretreatment of the active coating, immersing the molecular sieve in the transition metal solution for at least 2 hours and then removing the transition metal solution, drying and roasting the obtained molecular sieve to obtain a modified molecular sieve;
[0035] b. Mix the surfactant, the binder and the modified molecular sieve in step a with an appropriate amount of water to obtain an active coating slurry;
[0036] c. Coating the active coating slurry on the honeycomb carrier by dipping method or spraying method, and after the active coating is firmly adhered to the honeycomb carrier, the adsorption / catalytic material for waste gas treatment is obtained.
[0037] Due to the addition of the high-performance binder, the loading of the active coating on the h...
Example Embodiment
[0045] Example 1
[0046] Weigh 1.6kg cordierite honeycomb ceramics and 0.2kg active coating, in parts by weight, the active coating includes the following components: 100 parts of molecular sieves, 2 parts of polyethylene glycol, 2.5 parts of copper nitrate solution of 0.1mol / L , 5 parts of adhesive; wherein, the adhesive is SiO 2 -Al 2 O 3 -ZrO 2 composite sol.
[0047] SiO 2 -Al 2 O 3 -ZrO 2 The composite sol is prepared by the following method: adding 5.0 g of zirconium nitrate to 4.1 g of ammonia water while stirring, and then adding 2 g of oxalic acid to obtain a zirconium-containing sol; then adding 15 g of aluminum isopropoxide into the zirconium-containing sol, stirring evenly, and heating to 60℃, get Al 2 O 3 -ZrO 2 Composite sol; after cooling to about 25°C room temperature, add 10g methyl orthosilicate to Al 2 O 3 -ZrO 2 In the composite sol, stir evenly, and heat to 65 ° C to obtain SiO 2 -Al 2 O 3 -ZrO 2 composite sol.
[0048] Preparation proc...
Example Embodiment
[0049] Embodiment 2
[0050] Weigh 3.2kg ceramic fiber honeycomb and 0.35kg active coating, in parts by weight, the active coating includes the following components: 100 parts of molecular sieves, 3 parts of sodium carboxymethyl cellulose, 1.0 parts of 0.4mol / L chromium nitrate solution parts, 15 parts of adhesive; wherein, the adhesive is SiO 2 -Al 2 O 3 -ZrO 2 composite sol.
[0051] SiO 2 -Al 2 O 3 -ZrO 2 The composite sol is prepared by the following method: adding 10.0 g of zirconium nitrate to 8.1 g of ammonia water while stirring, and then adding 4 g of citric acid to obtain a zirconium-containing sol; then adding 25 g of γ-alumina to the zirconium-containing sol, stirring evenly, and heating to 70℃, get Al 2 O 3 -ZrO 2 Composite sol; after cooling to room temperature of about 25°C, add 21 g of methyl orthosilicate to Al 2 O 3 -ZrO 2 In the composite sol, stir evenly, and heat to 70 ° C to obtain SiO 2 -Al 2 O 3 -ZrO 2 composite sol.
[0052] Prepara...
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