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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

Pending Publication Date: 2020-04-14
JIANGSU SUJING GROUP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In the catalytic reduction method, the use of molecular sieves to catalyze the decomposition of nitrogen oxides is widely used in industry. However, the molecular sieve active coating is easy to fall off in the current molecular sieve adsorption / catalytic materials, and the specific surface area of ​​the carrier used is low. The molecular sieve active coating on the carrier is loaded. Low volume and other issues

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  • Adsorption/catalysis material for waste gas treatment and preparation method thereof

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preparation example Construction

[0033] The preparation method of the adsorption / catalysis material for exhaust gas treatment according to the present invention is described below, and the preparation method comprises the following steps:

[0034] a. Active coating pretreatment, soaking the molecular sieve in the transition metal solution for at least 2 hours, removing the transition metal solution, drying and roasting the obtained molecular sieve to obtain a modified molecular sieve;

[0035] b. mixing the modified molecular sieve in the surfactant, the adhesive and the step a with an appropriate amount of water to obtain the active coating slurry;

[0036] c. Coating the active coating slurry on the honeycomb support by dipping or spraying, and obtaining the adsorption / catalysis material for exhaust gas treatment after the active coating is firmly bonded to the honeycomb support.

[0037] Due to the addition of high-performance adhesives, the loading capacity of the active coating on the honeycomb carrier i...

Embodiment 1

[0046] Take by weighing 1.6kg cordierite honeycomb ceramics and 0.2kg active coating, by weight, the active coating comprises 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; Among them, 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: add 5.0 g of zirconium nitrate to 4.1 g of ammonia water while stirring, and then add 2 g of oxalic acid to obtain a zirconium-containing sol; then add 15 g of aluminum isopropoxide to the zirconium-containing sol, stir evenly, and heat to 60℃, Al 2 o 3 -ZrO 2 Composite sol; after cooling to room temperature of about 25°C, add 10g of 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 process: Soak the above-mentioned mo...

Embodiment 2

[0050] Take by weighing 3.2kg ceramic fiber honeycomb and 0.35kg active coating, by weight, active coating comprises following components: 100 parts of molecular sieves, 3 parts of sodium carboxymethyl cellulose, chromium nitrate solution 1.0 of 0.4mol / L Parts, 15 parts of adhesive; Among them, 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: add 10.0g of zirconium nitrate to 8.1g of ammonia water while stirring, and then add 4g of citric acid to obtain a zirconium-containing sol; then add 25g of γ-alumina to the zirconium-containing sol, stir evenly, and heat to 70℃, Al 2 o 3 -ZrO 2 Composite sol; after cooling to room temperature of about 25°C, add 21g 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] Preparation process: Soak the above-mentioned molecular sieve in ...

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Abstract

The invention provides an adsorption / catalysis material for waste gas treatment. The adsorption / catalysis material comprises a honeycomb carrier and an active coating composed of a molecular sieve, asurfactant, a transition metal solution and a binder, according to the preparation method, SiO2-Al2O3-ZrO2 composite sol is used as a binding agent; the firmness between each component of the active coating and the honeycomb carrier is effectively enhanced; the molecular sieve active coating is not easy to fall off; wherein the mass ratio of the honeycomb carrier to the active coating is 8: 1. 1 to 5: 1, the loading capacity of the molecular sieve active coating on the honeycomb carrier is obviously improved; the preparation method comprises the following steps: preparing the active coating from the following components in parts by weight: 100 parts of a molecular sieve, 1-5 parts of a surfactant, 1-3 parts of a transition metal solution with a concentration of 0.1-0.5 mol / L and 1-20 partsof a binder; therefore, the adsorption / catalytic material for waste gas treatment has a good catalytic reduction capacity, and a better waste gas treatment effect can be achieved. The preparation method of the adsorbing / catalyzing material for waste gas treatment is simple, practical and easy to implement.

Description

technical field [0001] The invention relates to the technical field of waste gas treatment, in particular to an adsorption / catalysis material for waste gas treatment and a preparation method thereof. Background technique [0002] Nitrogen oxides are one of the main pollutants in waste gas treatment. Among them, nitric oxide can combine with hemoglobin in the blood to poison people. Nitrogen dioxide is easy to form toxic smog and acid rain in the air. Nitrogen oxides are harmful to the ecological environment and Human health is very harmful. Common methods for dealing with nitrogen oxides include catalytic reduction, liquid adsorption, plasma activation, and microbial methods. [0003] In the catalytic reduction method, the use of molecular sieves to catalyze the decomposition of nitrogen oxides is widely used in industry. However, the molecular sieve active coating is easy to fall off in the current molecular sieve adsorption / catalytic materials, and the specific surface are...

Claims

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Application Information

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IPC IPC(8): B01J29/03B01J29/04B01J35/04B01J37/02B01J21/18B01J35/06B01J35/10B01D53/86B01D53/56B01D53/02
CPCB01D53/8628B01D53/02B01J37/0009B01J23/002B01J37/0201B01J21/18B01J29/03B01J29/04B01J2523/00B01J2229/18B01J35/56B01J35/58B01J35/61B01J2523/31B01J2523/41B01J2523/48
Inventor 戴铭支伟强
Owner JIANGSU SUJING GROUP
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