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Preparation method of CeO2-Cr2O3-Nb2O5 compound oxide catalyst

The technology of ceo2-cr2o3-nb2o5 and composite oxides is applied in the field of preparation of chlorine-containing organic waste gas combustion catalysts, and can solve the problems of low catalytic activity, deactivation of oxy-chlorine compounds and the like, and achieves low catalyst cost, simple and good preparation process. Effects of catalytic degradation activity and stability

Inactive Publication Date: 2016-01-20
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although noble metal catalysts have high catalytic activity for the catalytic oxidative degradation of various VOCs, for the catalytic elimination of chlorinated hydrocarbons or VOCs containing chlorinated hydrocarbons, they are vulnerable to the Cl produced by the decomposition of chlorinated compounds during the reaction process. 2 and HCl poisoning; in the high temperature area, it is easy to generate oxychlorine compounds and deactivate; on the other hand, noble metal catalysts are also highly active to Deacon reaction and chlorination reaction, and polychlorinated organic compounds are easy to be produced during the catalytic degradation process, especially for chlorine Processing of substituted aromatics tends to produce more toxic polychlorinated aromatics and dioxin-like compounds
In general, non-noble metal oxides (VB, IIB) have lower catalytic activity than noble metals, but are slightly stronger in resistance to heteroatoms such as Cl, Br, S poisoning

Method used

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  • Preparation method of CeO2-Cr2O3-Nb2O5 compound oxide catalyst

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Experimental program
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Effect test

Embodiment 1

[0015] 3.6gCr(NO 3 ) 3 9H 2 O and 15.6gCe(NO 3 ) 3 ·6H 2 Dissolve O in 180mL water, stir well and add 13.8g Nb 2 o 5 Powder. Add dropwise (NH 4 ) 2 CO 3 Precipitating agent, added dropwise until the pH value of the solution reaches 9.0, then aged at room temperature for 12 hours, then filtered, washed with deionized water and ethanol for several times until the filtrate is neutral, dried at 110°C for 2 hours, and roasted at 500°C for 2 hours. , making CeO 2 -Cr 2 o 3 -Nb 2 o 5 composite oxide catalyst. The mol ratio of Ce / Cr in this catalyst is 4:1, (Cr 2 o 3 +CeO 2 ) / Nb 2 o 5 The mass ratio is 1:2.

Embodiment 2

[0017] With the same operation of embodiment 1, the difference is: with 1.1gCr (NO 3 ) 3 9H 2 O, 4.7gCe(NO 3 ) 3 ·6H 2 O and 15.6g ammonium niobium oxalate were dissolved in 180mL water, stirred evenly and added dropwise under vigorous stirring (NH 4 ) 2 CO 3 Precipitant. The mol ratio of Ce / Cr in this catalyst is 4:1, (Cr 2 o 3 +CeO 2 ) / Nb 2 o 5 The mass ratio is 1:2.

Embodiment 3

[0019] With the same operation of embodiment 1, the difference is: with 0.6gCr (NO 3 ) 3 9H 2 O, 2.8gCe(NO 3 ) 3 ·6H 2 O and 18.4g ammonium niobium oxalate were dissolved in 180mL water, stirred evenly and added dropwise under vigorous stirring (NH 4 ) 2 CO 3 Precipitant. The mol ratio of Ce / Cr in this catalyst is 4:1, (Cr 2 o 3 +CeO 2 ) / Nb 2 o 5 The mass ratio is 1:4.

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Abstract

The invention provides a preparation method of a CeO2-Cr2O3-Nb2O5 compound oxide catalyst. Chromium nitrate, cerous nitrate and acidic Nb2O5 oxide or niobium oxalate ammonia serve as raw materials, the CeO2-Cr2O3-Nb2O5 compound oxide catalyst is prepared through a precipitation-deposition or co-precipitation method, the molecular ratio of Ce to Cr in the catalyst is 4:1, and the mass ratio of (Cr2O3 + CeO2) to Nb2O5 is 4:1-1:9. The catalyst is simple in preparation technology and low in cost and has good catalytic degradation activity and stability on dichloromethane (DCM), ethylene dichloride (DCE), trichloroethylene (TCE), chlorobenzene and other chlorine-containing organic compounds, CO2 and HCl are high in selectivity, and no polychlorocarbon or other by-products are generated.

Description

technical field [0001] The invention relates to a preparation method of a high-performance chlorine-containing organic waste gas combustion catalyst, in particular to CeO 2 -Cr 2 o 3 -Nb 2 o 5 Preparation method of composite oxide catalyst. Background technique [0002] Chlorine-containing volatile organic compounds (CVOCs) are a class of compounds that are extremely harmful to the environment and human health. The common ones are dichloromethane (DCM), chloroform (CF), dichloroethane (DCE), trichloro Ethylene (TCE), carbon tetrachloride (CT), chlorobenzene (PhCl), etc., are widely used as organic solvents and semi-finished products in chemical production processes due to their good chemical stability. Catalytic combustion technology is one of the most important and effective methods for the purification and treatment of CVOCs pollutants. Therefore, the development of efficient and stable chlorine-containing organic waste gas combustion catalysts is of great significanc...

Claims

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Application Information

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IPC IPC(8): B01J23/26B01D53/86B01D53/70
Inventor 周仁贤杨鹏
Owner ZHEJIANG UNIV
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