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Monolithic catalyst used for oxidizing CO and methanal under ordinary temperature and preparation method thereof

An integral catalyst, room temperature oxidation technology, applied in the field of environmental engineering, can solve the problems of high operating cost of non-precious metal catalysts, expensive precious metal catalysts, poor catalyst strength, etc., and achieves easy control of operating conditions, low cost and long service life. Effect

Active Publication Date: 2011-07-06
718TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a monolithic catalyst for normal temperature oxidation of CO and formaldehyde in order to solve the problems of high operating cost, poor anti-toxin ability, expensive price of noble metal catalysts, high resistance, and poor catalyst strength of non-precious metal catalysts. its preparation method

Method used

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  • Monolithic catalyst used for oxidizing CO and methanal under ordinary temperature and preparation method thereof
  • Monolithic catalyst used for oxidizing CO and methanal under ordinary temperature and preparation method thereof
  • Monolithic catalyst used for oxidizing CO and methanal under ordinary temperature and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 1. Dissolve 0.06gPd in ​​2ml of aqua regia to prepare H 2 PdCl 4 、H 2 PdCl 6 solution, evaporated to dryness and diluted with distilled water to 1.0ml; take 0.01g Pt dissolved in 2ml of aqua regia to obtain H 2 PtCl 4 、H 2 PtCl 6 solution, evaporated to dryness and diluted with distilled water to 1.0ml.

[0042] 2. Soak the cordierite honeycomb in 2% dilute hydrochloric acid and boil for 2 hours, then wash it with distilled water until neutral, dry it, and calcinate it at 400°C for 3 hours;

[0043] 3. Add 40ml of manganese nitrate solution with a concentration of 0.05g / ml dropwise into the alumina sol and stir evenly, take 20g of cordierite honeycomb treated with dilute acid and soak in the above mixture for 2 minutes, after purging, drying, Calcined at 400° C. for 3 hours and then ready for use, the loading of the coating was 3%.

[0044] 4. The 1.0ml chloroplatinic acid solution prepared in the first step, the 1.0ml chloropalladium acid solution and the 0.2ml...

Embodiment 2

[0049] 1. Dissolve 0.12g Pd in ​​6ml of aqua regia to obtain H 2 PdCl 4 、H 2 PdCl 6 solution, evaporated to dryness and diluted with distilled water to 1.0ml; take 0.05gPt dissolved in 4ml of aqua regia to obtain H 2 PtCl 4 、H 2 PtCl 6 solution, evaporated to dryness and diluted with distilled water to 1.0ml.

[0050] 2. Soak cordierite honeycomb in 6% dilute nitric acid and boil for 3 hours, then wash with distilled water until neutral, dry, and calcinate at 450°C for 4 hours;

[0051] 3. Add 40ml ferric nitrate solution with a concentration of 5g / ml dropwise into the alumina coating slurry and stir evenly, then take 20g cordierite honeycomb treated with dilute acid and soak in the above mixed solution for 3 minutes, after purging and drying , Calcined at 450° C. for 3 hours and then ready for use, the loading of the coating is 8%.

[0052] 4. After mixing 1.0ml of chloroplatinic acid solution and 1.0ml of chloropalladium acid solution prepared in the first step, soak...

Embodiment 3

[0062] 1. Dissolve 0.6gPd in ​​5ml of aqua regia to prepare H 2 PdCl 4 、H 2 PdCl 6 solution, evaporated to dryness and diluted with distilled water to 0.9ml; take 0.3gPt dissolved in 10ml of aqua regia to obtain H 2 PtCl 4 、H 2 PtCl 6 The solution was evaporated to dryness and diluted with distilled water to 0.8ml.

[0063] 2. Soak the cordierite honeycomb in 12% dilute nitric acid and boil for 3 hours, then wash it with distilled water until neutral, dry it, and calcinate it at 550°C for 4 hours;

[0064] 3. Add 40ml of cerium nitrate solution with a concentration of 13g / ml dropwise into the alumina sol and stir evenly, take 20g of cordierite honeycomb treated with dilute acid and soak in the above mixture for 4 minutes, after purging, drying, Calcined at 550° C. for 3 hours and then ready for use, the loading of the coating was 20%.

[0065] 4. After mixing 0.8ml of chloroplatinic acid solution and 0.9ml of chloropalladium acid solution prepared in the first step, so...

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Abstract

The invention provides monolithic catalysts used for oxidizing CO and methanal under ordinary temperature and the preparation method thereof, which belong to the field of environmental engineering. The monolithic catalyst comprises a carrier, a coating, Pt, Pd and addition agent. The preparation method comprises the steps as follows: the carrier is immersed in mixed solution comprising precursor solution of an auxiliary coating and main coating collosol, and then is blown, dried and calcined; then the carrier is immersed in mixed solution comprising chloroplatinic acid solution, chloropalladite acid solution and nitrate solution of the addition agent for more than 4 hours by adopting an isovolumetric immersion method; and finally, reducing agent is added into mixed solution in which the carrier is immersed under the temperature ranging from 45 to 90 DEG C, and then the carrier is taken out, washed through water and dried so as to obtain target products. The monolithic catalyst used for oxidizing CO and methanal under ordinary temperature and the preparation method thereof have the advantages of simple technology, low cost and the like, are easy to control the operation conditions, and are also easy to produce on a large scale. By adopting the Nanometer Pt and Pd catalyst, CO and methanal can be eliminated under the room temperature, thereby having high antitoxic performance, high moisture resistance and stable property.

Description

technical field [0001] The invention relates to an integral catalyst for oxidizing CO and formaldehyde at normal temperature and a preparation method thereof, belonging to the field of environmental engineering. Background technique [0002] CO is a poisonous and harmful gas, when the content of CO in the air is 2.0×10 -5 mol / L, people will experience dizziness and vomiting within two hours, when the content reaches 5.4×10 -4 mol / L, it will cause death within 1min to 3min. Formaldehyde is also a highly toxic indoor environmental pollutant. People living in an environment with excessive formaldehyde for a long time can increase the possibility of cancer. Therefore, the elimination of CO and formaldehyde, especially at low temperature, has very important practical application value. [0003] Due to the incomparable advantages of catalytic oxidation over other methods (such as adsorption), catalytic oxidation is currently the main method for eliminating CO produced in the en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01J23/63B01D53/62B01D53/72B01D53/86A62D3/38
CPCY02A50/20
Inventor 祝维燕艾长波张纪领赵罗生李虎群
Owner 718TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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