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Catalyst for eliminating formaldehyde in air by low-temperature catalytic oxidation

A technology for oxidation catalysts and formaldehyde, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve problems such as easy by-product formation, achieve convenient operation, The effect of the simple preparation process

Inactive Publication Date: 2009-08-05
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, molecular sieve catalysts can also be used for the catalytic oxidation of formaldehyde, but by-products are easily generated during the reaction

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] With Mn(NO 3 ) 2 As raw material, with (NH 4 ) 2 CO 3 The solution is a precipitating agent, and manganese carbonate is precipitated. After the precipitation is complete, it is aged, filtered, washed, dried and roasted to obtain MnO 2 . with H 2 PtCl 6 It is the precursor salt of the active component, and the supported Pt catalyst is prepared by impregnation. After impregnation, it is dried, roasted, and reduced by H2 to obtain Pt / MnO 2 Catalyst with a Pt content of 0.5 wt%.

[0019] For the catalytic oxidation of formaldehyde, the catalyst has a conversion rate of 17 at room temperature and 100 at 75°C (the formaldehyde concentration is 220ppm, and the reaction mass space velocity reaches 50000ml / g cat h).

Embodiment 2

[0021] Preparation method is similar to embodiment 1, difference is with Ce(NO 3 ) 3 and Mn(NO 3 ) 2 The mixed solution of Na 2 CO 3 The solution is a precipitating agent, and after the precipitation is complete, it is washed, dried, and calcined to obtain a Ce and Na-doped manganese oxide composite support, in which CeO 2 The NaO content is 1 wt%, and the NaO content is 0.05 wt%. with H 2 PtCl 6 As the precursor salt of the active component, the supported Pt catalyst was prepared by the impregnation method, and after the impregnation was completed, it was dried, calcined, and H 2 After reduction, Pt / Na / Ce / Mn is obtained 3 o 4 Catalyst with a Pt content of 0.5 wt%.

[0022]For the catalytic oxidation of formaldehyde, the catalyst has a conversion rate of 72% at room temperature (the formaldehyde concentration is 220ppm, and the reaction mass space velocity reaches 50000ml / g cat h).

Embodiment 3

[0024] The preparation method is similar to that of Example 2, except that the Pt content is 1 wt%.

[0025] For the catalytic oxidation of formaldehyde, the catalyst can achieve full conversion at room temperature (the concentration of formaldehyde is 220ppm, and the reaction mass space velocity reaches 50000ml / g cat h).

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Abstract

The invention relates to a catalyst for eliminating formaldehyde by catalytic oxidation at low temperature in air. The catalyst contains manganese oxide, noble metal platinum and an addition agent, namely rare earth oxide, alkali or alkaline earth oxide. The catalyst has high catalytic oxidation activity to formaldehyde, and can completely oxidize the formaldehyde into carbon dioxide and water at room temperature. The catalyst has the advantages of simple and convenient preparation and low cost, and is suitable for industrial application.

Description

technical field [0001] The invention is used to catalyze and oxidize formaldehyde in air at room temperature, and can catalyze and oxidize formaldehyde gas into carbon dioxide and water at room temperature, and the conversion rate of formaldehyde can reach 100%. Background technique [0002] Formaldehyde is an important chemical raw material with a wide range of applications. Formaldehyde solution and its vapor have a strong stimulating effect on human eyes, nasal cavity, skin and mucous membranes of the respiratory system, and have serious toxic effects on human health through respiratory tract or contact with skin. Even low concentrations of formaldehyde in the air can cause many diseases including cancer after long-term exposure. From 1980 to 2004, formaldehyde was classified as a confirmed carcinogen three times by different international organizations, including EPA and IARC. Therefore, the elimination technology of formaldehyde in the air has great application value....

Claims

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Application Information

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IPC IPC(8): B01J23/656B01J23/63B01J23/58A62D3/38B01D53/72B01D53/86A62D101/28
Inventor 郭耘张鹏飞卢冠忠张志刚王丽郭杨龙王艳芹王筠松
Owner EAST CHINA UNIV OF SCI & TECH
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