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Nanometer titanium dioxide (TiO2) of catalyst for denitrating flue gas by selective catalytic reduction and method for preparing same

A denitration catalyst and nano-titanium dioxide technology, applied in physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of less acidic active sites on the surface of titanium dioxide and catalysts. Faster activity decay, complex manufacturing process and other problems, to achieve the effect of many acidic active sites on the surface, moderate specific surface area, and long mechanical life

Active Publication Date: 2010-05-19
CHENGDU DONGFANG KWH ENVIRONMENTAL PROTECTION CATALYSTS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, although the nano-titanium dioxide produced by foreign companies can be used as a carrier for denitration catalysts and has achieved good results, they still have the following defects to be overcome: 1. The surface is weakly acidic or even neutral, so the surface acidic active points of titanium dioxide 2. As the substrate of the denitration catalyst, a large number of reinforcing materials need to be added to improve the mechanical strength and thermal stability, the manufacturing process is complicated and the cost is high; 3. Because the surface acidic active sites are relatively few, the manufacturing The catalyst activity decays quickly and the anti-poisoning ability is poor; 4. This kind of titanium dioxide is made of ammonium metatungstate aqueous solution and metatitanic acid into tungsten-added nano-titanium dioxide, and the cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The raw materials for producing titanium dioxide include 850 parts of metatitanic acid, 25 parts of nitric acid with a concentration of 60%, 15 parts of barium carbonate with a main content ≥ 98.5%, and 15 parts of deionized water.

[0030] Its manufacturing method comprises the following steps:

[0031] (1) 850 parts of metatitanic acid produced by the sulfuric acid method are washed with deionized water to remove impurities, so that the alkali metal and heavy metal impurity content of metatitanic acid is less than 500ppm, and then press filtration is made into a filter cake, where TiO in metatitanic acid 2 Solid content 28%, H 2 SO 4 Content 9%, rutile content 200m 2 / g;

[0032] (2) Mix 550 parts of filter cake with 25 parts of nitric acid with a concentration of 60%, 15 parts of barium carbonate with a main content ≥98.5%, and 15 parts of deionized water to make TiO 2 Sol;

[0033] (3) TiO 2 The sol is transported to the rotary drying furnace at 80-540°C with...

Embodiment 2

[0035] The raw materials for producing titanium dioxide include 800 parts of metatitanic acid, 20 parts of nitric acid with a concentration of 50%, 10 parts of barium carbonate with a main content ≥ 98.5%, and 10 parts of deionized water.

[0036] Its manufacturing method comprises the following steps:

[0037] (1) Wash 800 parts of metatitanic acid produced by the sulfuric acid method with deionized water to remove impurities, so that the content of alkali metal and heavy metal impurities in metatitanic acid is less than 500ppm, and then press filter to make a filter cake, where TiO in metatitanic acid 2 Solid content 25%, H 2 SO4 Content 8%, rutile content 200m 2 / g;

[0038] (2) Mix 500 parts of filter cake with 20 parts of nitric acid with a concentration of 50%, 10 parts of barium carbonate with a main content ≥ 98.5%, and 10 parts of deionized water to make TiO 2 Sol;

[0039] (3) TiO 2 The sol is transported to the rotary drying furnace at 80-540 °C with a gradien...

Embodiment 3

[0041] The raw materials for producing titanium dioxide include 900 parts of metatitanic acid, 30 parts of nitric acid with a concentration of 70%, 13 parts of barium carbonate with a main content ≥ 98.5%, and 13 parts of deionized water.

[0042] Its manufacturing method comprises the following steps:

[0043] (1) 900 parts of metatitanic acid produced by the sulfuric acid method are washed with deionized water to remove impurities, so that the alkali metal and heavy metal impurity content of metatitanic acid is 2 Solid content 35%, H 2 SO 4 Content 10%, rutile content 200m 2 / g;

[0044] (2) Mix 600 parts of filter cake with 30 parts of nitric acid with a concentration of 70%, 13 parts of barium carbonate with a main content ≥ 98.5%, and 13 parts of deionized water to make TiO 2 Sol;

[0045] (3) TiO 2 The sol is transported to the rotary drying furnace at 80-540 °C with a gradient of 30-50 °C / hour for continuous drying and calcination in the rotary drying furnace. Aft...

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Abstract

The invention relates to a method for preparing nanometer titanium dioxide (TiO2) which is used as the substrate of honeycomb catalyst for denitrating the waste flue gas from the coal burning boiler of a power plant, the furnace and the kiln of a cement plant and the refuse incinerator on the basis of the selective catalytic reduction (SCR) technology. The method comprises the following steps: (1) washing metatitanic acid with deionized water to remove impurities, and filtering and pressing the metatitanic acid into a filter cake; (2) preparing the filter cake, barium carbonate and deionized water into TiO2 sol or preparing the filter cake and deionized water into TiO2 suspension; and (3) delivering the TiO2 sol or the TiO2 suspension into a rotary kiln to dry and calcine the TiO2 sol or the TiO2 suspension to obtain the high-performance barium nanometer TiO2 containing barium or the high-performance barium nanometer TiO2 containing no barium. The method has simple preparing steps and low cost and ensures that the prepared nanometer TiO2 has more acidic and active points on surface, moderate specific surface area and good dispersity and the denitrating catalyst which is prepared from the nanometer TiO2 used as the substrate and other components has high activity, good thermostability and high mechanical strength.

Description

technical field [0001] The present invention relates to waste gas (i.e. flue gas) such as waste gas from coal-fired boilers in power plants, waste gas from cement plant kilns, waste incinerators, etc. The cellular denitrification catalyst based on selective catalytic reduction (SCR) technology is used as a base material (i.e. active component carrier) ) of nano titanium dioxide, and its manufacture method. Background technique [0002] At present, selective catalytic reduction (SCR) technology is the most successful and widely used technology for removing NOx from flue gas produced by coal-fired boilers in power plants, cement plant kilns, and waste incinerators. Among them, the denitrification catalyst is the core and key part of implementing this technology, and nano-titanium dioxide is the most used and most important substrate in the denitrification catalyst. [0003] The base material of the denitration catalyst is TiO 2 (titanium dioxide), the active ingredient is V ...

Claims

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Application Information

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IPC IPC(8): B01D53/86B01D53/56C01G23/08B01J21/06B01J23/30
Inventor 冷洪川艾生炳李晓勇梁材
Owner CHENGDU DONGFANG KWH ENVIRONMENTAL PROTECTION CATALYSTS
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