Noble metal monolithic catalyst for purifying organic waste gas and preparation method thereof

An integrated catalyst, organic waste gas technology, applied in catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc., can solve the problem of low catalyst activity, difficult to meet requirements, load problems such as low volume, to achieve the effect of shortening the coating cycle, low manufacturing cost, and reducing the number of loads

Inactive Publication Date: 2010-08-25
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Monolithic catalysts generally use γ-Al 2 o 3 As the first coating, the active component is used as the second coating, and the preparation method generally adopts the aqueous solution impregnation method, but γ-Al 2 o 3 The loading capacity of the catalyst is low, and it is easy to fall off, resulting in low catalyst activity
[0003] Yin Weidong and others used cordierite honeycomb ceramics as the first carrier, γ-Al 2 o 3 Research on the removal of VOCs using the composite oxide catalyst as the second support found that γ-Al 2 o 3 The activity of the catalyst is the best when the load is 7%-10%, and the active alumina supported by the cordierite honeycomb ceramic catalyst in the publication number CN14014116A is only 3%-5.3%, which is difficult to meet the requirements
To reach Al 2 o 3 To meet the loading requirements, researchers have tried a variety of loading methods: aluminum paste washing method, aluminum nitrate thermal decomposition method, in-situ coating method, in-situ synthesis method, etc., these methods can improve Al to a certain extent 2 o 3 load, but the operation is complicated and the degree of realization is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Take 200 milliliters of nitric acid solution with a mass concentration of 25%, heat and boil with an electromagnetic cooker, add a cylindrical cordierite honeycomb ceramics with a size of 30 mm (diameter) * 50 mm (height), and the specification is 200 holes / inch 2 , washed with pure water and dried at a high temperature of 120° C. for 2 hours to room temperature, and weighed 28.8269 grams. After heating for 50 minutes, the cordierite honeycomb ceramics were taken out, rinsed with pure water to pH=6-7, dried at 60°C for 4 hours, at 160°C for 2 hours, and naturally cooled to room temperature.

[0027] Weigh 4.9393 grams and 1.8798 grams of precursor zirconium nitrate pentahydrate Zr (NO 3 ) 4 ·5H 2 O, manganese acetate tetrahydrate Mn (CH 3 COO) 2 4H 2 O, add 6 milliliters of pure water, stir evenly to the mixed salt solution A, soak the ceramic carrier that has been acid-etched in the mixed salt solution A for 4 hours, then remove it and leave it to dry at room temp...

Embodiment 2

[0032] Weigh the cordierite honeycomb ceramic carrier with the specifications described in Example 1, which weighs 29.3125 grams, and carry out acid etching pretreatment according to the conditions and steps of Example 1.

[0033] Weigh respectively 5.9368 grams and 0.8473 grams of zirconium manganese precursor zirconium nitrate pentahydrate Zr (NO 3 ) 4 ·5H 2 O, manganese acetate tetrahydrate Mn (CH 3 COO) 2 4H 2O, add 6 milliliters of pure water, stir evenly to the mixed salt solution A1, soak the ceramic carrier etched by hexanoic acid in the mixed salt solution A1 for 4 hours, then remove it and leave it to dry at room temperature for 12 hours, then place it in a drying oven, Dry at 60°C and 120°C for 4 hours respectively, and then bake in an air atmosphere in a muffle furnace for 4 hours to obtain the coated carrier B1; measure 4.02 ml of palladium chloride hydrochloric acid solution with a concentration of 60 mg / mL, and coat the carrier B1 was soaked in it for 3 hou...

Embodiment 3

[0038] Weigh the cordierite honeycomb ceramic carrier with the specifications described in Example 1, which weighs 29.3125 grams, and carry out acid etching pretreatment according to the conditions and steps of Example 1.

[0039] Weigh 3.393 grams and 2.9055 grams of zirconium manganese precursor zirconium nitrate pentahydrate Zr (NO 3 ) 4 ·5H 2 O, manganese acetate tetrahydrate Mn (CH 3 COO) 2 4H 2 0, add 6 milliliters of pure water, stir evenly to the mixed salt solution A2, soak the ceramic carrier that has been acid-etched in the mixed salt solution A2 for 4 hours, then remove it and leave it to dry at room temperature for 12 hours, then place it in a drying oven, Dry at 60°C and 120°C for 4 hours respectively, and then bake in an air atmosphere in a muffle furnace for 4 hours to prepare the coating carrier B2; measure 4.46 ml of palladium chloride hydrochloric acid solution with a concentration of 60 mg / mL, and coat the carrier B2 was soaked in it for 3 hours, then ...

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Abstract

The invention provides a noble metal monolithic catalyst for purifying organic waste gas and a preparation method thereof. The catalyst is a noble metal monolithic catalyst which uses cordierite ceramic pretreated by dilute nitric acid as a carrier and is loaded with zirconium-manganese mixed oxide serving as a first coating layer and a noble metal palladium active ingredient serving as a second coating layer. The method for preparing the catalyst comprises the following steps of: acidifying the carrier by adopting the dilute nitric acid to increase the specific surface area and the surface coarseness of the carrier, soaking and roasting a precursor loaded with zirconium and manganese serving as the first coating layer, and soaking a precursor loaded with noble metal palladium serving as the second coating layer of the main active ingredient. The catalyst has uniformly-loaded active ingredients, high catalytic performance, little using amount and low cost of noble metal, easy popularization, high catalytic combustion removal efficiency of triphenyl, polycyclic aromatic hydrocarbon and other organic waste gas and low ignition temperature and can be widely applied to the purification treatment of industrial organic waste gas.

Description

technical field [0001] The invention relates to a noble metal integral catalyst for purifying organic waste gas and a preparation method thereof. Background technique [0002] Precious metal monolithic catalysts are important catalysts in the chemical industry. This type of catalyst is widely used in catalytic reactions such as purification of volatile organic compounds, automobile exhaust purification, and flue gas denitrification. Economic efficiency has a major impact. Monolithic catalysts generally use γ-Al 2 o 3 As the first coating, the active component is used as the second coating, and the preparation method generally adopts the aqueous solution impregnation method, but γ-Al 2 o 3 The loading capacity of the catalyst is low, and it is easy to fall off, resulting in a low catalyst activity. [0003] Yin Weidong and others used cordierite honeycomb ceramics as the first carrier, γ-Al 2 o 3 Research on the removal of VOCs using the composite oxide catalyst as the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/656B01J37/02B01D53/86B01D53/72
Inventor 黄碧纯姚伟卿王娟叶代启
Owner SOUTH CHINA UNIV OF TECH
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