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Preparation method of dioxin removal and denitration catalyst and product thereof

A technology for denitrification catalyst and dioxin removal, which is applied in the field of dioxin removal, denitrification catalyst preparation, and denitrification catalyst, can solve the problems of high prices of precious metals and transition metal oxides, achieve remarkable technical effects, avoid environmental pollution, reduce The effect of production costs

Inactive Publication Date: 2015-12-02
ANHUI YUANCHEN ENVIRONMENTAL PROTECTION SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main active ingredient of the dioxin removal catalyst is TiO 2 , V 2 o 5 、WO 3 、Co 3 o 4 and other transition metal oxides or noble metals such as Pt and Pd, but noble metals and transition metal oxides are expensive, so it is necessary to develop an efficient and economical de-dioxin catalyst

Method used

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preparation example Construction

[0019] The invention provides a method for preparing a catalyst for removing dioxins and denitrification, characterized in that the method comprises the following steps,

[0020] Step 1, pretreatment, use deionized water to clean the spent hydrodesulfurization catalyst, and dry it after cleaning. The drying method can be any method in the prior art, such as drying in a drying oven. The corresponding parameters are: drying temperature 100℃~120℃, drying time 15h~30h;

[0021] Step 2, the active components of titanium dioxide and tungsten trioxide are mixed, and mixed according to the mass ratio of ammonium metatungstate and titanic acid of 1:9 to make a suspension, and after filtration, the wet powder is roasted to obtain titanium dioxide coated with tungsten trioxide. The calcination process of the wet powder can adopt any method in the prior art, such as calcination in a muffle furnace, the calcination temperature is 450°C~550°C, and the calcination time is 2h~5h;

[0022] St...

Embodiment 1

[0041] Step 1, pretreatment, using deionized water to clean the spent hydrodesulfurization catalyst, after cleaning, move the spent hydrodesulfurization catalyst to a drying oven for drying at 100°C for 30 hours;

[0042]Step 2: Mix the active components of titanium dioxide and tungsten trioxide, and mix according to the mass ratio of ammonium metatungstate and titanic acid 1:9 to make a suspension. After filtering, move the wet powder to a muffle furnace for roasting. Roasting 5h;

[0043] Step 3, ball milling and mixing, adding the titanium dioxide loaded with tungsten trioxide obtained in step 2 and the spent hydrodesulfurization catalyst pretreated in step 1 into a ball mill according to a mass ratio of 1:9 to form a raw material mixed powder, and simultaneously adding oxalic acid or Any one of citric acid, and add water and mix evenly, wherein the ratio of raw material mixed powder, oxalic acid or citric acid, and water is preferably mass percentage: 65%, 30%, 5%;

[004...

Embodiment 2

[0046] Step 1, pretreatment, using deionized water to clean the spent hydrodesulfurization catalyst, after cleaning, move the spent hydrodesulfurization catalyst to a drying oven for drying at 110°C for 24 hours;

[0047] Step 2: Mix the active components of titanium dioxide and tungsten trioxide, mix according to the mass ratio of ammonium metatungstate and titanic acid 1:9, make a suspension, filter and move the wet powder to a muffle furnace for roasting, at 500 °C Roasting for 3h;

[0048] Step 3, ball milling and mixing, adding the titanium dioxide loaded with tungsten trioxide obtained in step 2 and the waste hydrodesulfurization catalyst pretreated in step 1 into a ball mill according to a mass ratio of 1:3 to form a raw material mixed powder, and simultaneously adding oxalic acid or Any one of citric acid, and add water and mix evenly, wherein the ratio of raw material mixed powder, oxalic acid or citric acid, and water is preferably mass percentage: 65%, 30%, 5%;

[...

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Abstract

Belonging to the technical field of flue gas denitration, the invention relates to a preparation method of a dioxin removal and denitration catalyst. The method comprises the steps of: pretreatment; mixing of titanium dioxide and tungsten trioxide active components; ball milling and mixing; and finished product drying. The technical scheme realizes recycling of a hydrogenation catalyst, and converts it into the catalyst for dioxin removal and denitration, avoids the environmental pollution caused by direct emission, and lowers the making cost of the dioxin removal catalyst. The invention also relates to the dioxin removal and denitration catalyst prepared by the method. In the technical scheme, all components of the catalyst form an Mo-V-Ni-W / TiO2-Al2O3 system to realize denitration function under the action of active components Mo, V, Ni, W and the carrier TiO2-Al2O3. Also, by means of the V-W-Ti-Mo system composed by transition metals, dioxin can be well decomposed into HCl, CO2 and H2O. Therefore, the catalyst integrates the functions of dioxin removal and denitration, and has significant effect.

Description

technical field [0001] The invention relates to a method for preparing a dioxin and denitration catalyst, and also relates to a dioxin and denitration catalyst prepared by the method, which belongs to the technical field of flue gas denitration. Background technique [0002] Dioxin refers to the general term for chlorine-containing organic compounds containing two or one oxygen bond connecting two benzene rings. It is a class of highly toxic substances that can cause various cancers and infant deformities. It mainly comes from waste incineration plants and related chemical industries. factory emissions. At present, the methods for removing dioxins mainly include flue gas quenching technology, activated carbon adsorption technology and SCO dioxin removal technology. Among them, SCO dioxin removal technology is the most widely used, and its principle is that under the action of special ceramics for dioxin removal , decompose dioxin into HCl, CO 2 , H2O, de-dioxin catalyst is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/888B01D53/86B01D53/72B01D53/56
Inventor 张庆丽刘江峰徐辉
Owner ANHUI YUANCHEN ENVIRONMENTAL PROTECTION SCI & TECH
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