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Catalyst for reducing dioxin emission in waste incineration

A waste incineration and catalyst technology, which is applied in the field of dioxin treatment, can solve problems such as loss of activity, catalyst poisoning, and high price of precious metals, and achieve the effects of reducing production, prolonging service life, and reducing costs

Inactive Publication Date: 2010-04-14
GUANGZHOU KECHENG ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the initial activity of existing catalysts is good, a large amount of HCl will be produced in waste incineration. Precious metals are very sensitive to chloride ions, which will easily poison the catalyst and lose its activity. It is difficult to guarantee long-term use.
In addition, the price of precious metals is relatively high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The formula is:

[0020] Cerium oxide 4% Palladium oxide 8%

[0021] Yttrium oxide 3% Silica 7%

[0022] Titanium dioxide 78%.

[0023] Preparation method: Mix and dissolve cerium nitrate, palladium nitrate and yttrium nitrate in water, impregnate the titanium dioxide carrier containing silicon dioxide with the aqueous solution for 30 minutes, then dry at 80°C, and finally roast at 700°C to obtain the catalyst sample .

Embodiment 2

[0025] The formula is:

[0026] Cerium oxide 3% Palladium oxide 6%

[0027] Yttrium Oxide 2% Silica 4%

[0028] Titanium dioxide 85%.

[0029] Preparation method: mix and dissolve cerium nitrate, palladium nitrate and yttrium nitrate in water, impregnate the titanium dioxide carrier containing silicon dioxide with the aqueous solution for 40 minutes, then dry at 100°C, and finally roast at 800°C to obtain the catalyst sample .

Embodiment 3 2

[0030] Embodiment 3 dioxin decomposition experiment:

[0031] The catalyst sample prepared in Example 1 was in the form of strips, which were cut into short sections about 1 cm in length with scissors, and 1 liter was taken and put into a reactor for industrial flow measurement experiments of dioxin decomposition. The reactor is placed in a tubular electric furnace, the inlet of the reactor is connected with the exhaust flue of the waste incinerator, and the outlet of the reactor is connected with a suction pump. After the pump is turned on, the dust-removed flue gas passes through the catalyst bed. 40 hours after the start of the experiment, the inlet and outlet gas samples were collected for analysis, and the results are shown in Table 1:

[0032] Table 1

[0033] sampling time

[0034] sampling time

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PUM

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Abstract

The invention discloses a catalyst for reducing dioxin emission in waste incineration, consisting of the following components by weight percent: 1 to 6 percent of cerium oxide, 1 to 10 percent of palladium oxide, 0.5 to 3 percent of yttria and the balance of titanium dioxide. On the condition without high temperature, the catalyst has activation and can lead the waste to be fully oxidized and incinerated, thereby reducing the generation amount of the dioxin. The catalyst does not use precious metals, and generated HCl does not lead the catalyst to be poisoned, thus prolonging the service life and also lowering the cost.

Description

technical field [0001] The invention relates to the technical field of dioxin treatment, in particular to a catalyst for treating dioxin. Background technique [0002] Dioxin dioxin, commonly known as dioxin. It belongs to the chlorinated tricyclic aromatic hydrocarbon compound and is a mixture composed of more than 200 isomers and homologues. Its toxicity is represented by semi-lethal dose (LD50). It is about 100 times more poisonous than potassium cyanide and about 900 times more poisonous than arsenic. It is the most toxic, very stable and difficult to decompose first-class carcinogen. It also has reproductive toxicity, immunotoxicity and endocrine toxicity. [0003] There are two main sources of dioxins. One is the manufacture of chemical substances including pesticides, especially chlorine-based chemicals, such as insecticides, herbicides, wood preservatives, and defoliants (used by the US military in the Vietnam War). , polychlorinated biphenyls and other products...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63B01J37/02B01D53/86B01D53/72
Inventor 王永成陈伟华
Owner GUANGZHOU KECHENG ENVIRONMENTAL PROTECTION TECH
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