Titania powder for honeycomb waste gas treating catalyst, and waste gas treating catalyst

A technology for waste gas treatment and titanium dioxide, which is used in catalyst activation/preparation, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc. It can solve the difficulties of honeycomb structures, catalyst reduction, poor formability, etc. question

Active Publication Date: 2008-12-10
JGC CATALYSTS & CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the raw materials for the honeycomb exhaust gas treatment catalyst mainly composed of titanium oxide and / or titanium composite oxide powder have poor formability, so it is necessary to manufacture the above-mentioned honeycomb with thin partition walls and increased number of through holes by extrusion molding. Constructs are difficult
[0009] In addition, in the exhaust gas of coal-fired boilers, the content of hard glass-like dust is 10-25g / Nm 3 In addition, the exhaust gas flow rate in the denitrification reaction device is extremely high, and there is a problem that the catalyst is significantly reduced due to attrition. Therefore, people require a honeycomb exhaust gas treatment catalyst with high abrasion resistance.

Method used

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  • Titania powder for honeycomb waste gas treating catalyst, and waste gas treating catalyst
  • Titania powder for honeycomb waste gas treating catalyst, and waste gas treating catalyst
  • Titania powder for honeycomb waste gas treating catalyst, and waste gas treating catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Example 1

[0060] The titanium sulfate solution prepared by sulfuric acid titanium dioxide manufacturing process is thermally hydrolyzed to obtain metatitanic acid slurry. Take out 25.0 kg of the metatitanic acid slurry as titanium dioxide, put it into a stirred tank with a reflux device, add 30.5 kg of 15% by weight ammonia water therein, so that the pH value is adjusted to 9.5, and then fully stir at 95 ° C 1 hour, while heating to ripen. Then cool, take out the slurry, filter, dehydrate, wash to obtain SO 4 4.1wt% (based on dry weight), Na 2 O is 0.03wt% (based on dry weight) of the washed filter cake. This washed cake was dried at 110° C. for 20 hours, and then baked at 509° C. for 5 hours to obtain titanium dioxide powder. This titanium dioxide powder was further pulverized to prepare a titanium dioxide powder (a) for a honeycomb exhaust gas treatment catalyst composed of titanium dioxide. Using a powder X-ray diffraction device (manufactured by Rigaku Cor...

Embodiment 2

[0062] Example 2

[0063] The washed filter cake prepared in the same manner as in Example 1 was dried at 110° C. for 20 hours, and then calcined at 459° C. for 5 hours to obtain a honeycomb-shaped titanium dioxide powder for exhaust gas treatment catalyst composed of titanium dioxide. This titanium dioxide powder was pulverized to prepare a titanium dioxide powder (b) for a honeycomb exhaust gas treatment catalyst composed of titanium dioxide. The peak height X of the (101) plane of the anatase-type titanium dioxide crystal (101) measured by the powder X-ray diffraction method of the titanium dioxide powder (b) for the honeycomb exhaust gas treatment catalyst composed of titanium dioxide is 121 mm, compared with the peak intensity of the reference sample The ratio (X / Y) was 0.80.

[0064] In addition, in this titanium dioxide powder (b), the crystallite particle size calculated by Scherrer's formula in the anatase type crystal (101) plane is 15.2 nm, and the sulfate radic...

Embodiment 3

[0065] Example 3

[0066] The washed filter cake prepared in the same manner as in Example 1 was dried at 110° C. for 20 hours, and then calcined at 601° C. for 5 hours to obtain a honeycomb-shaped titanium dioxide powder for exhaust gas treatment catalyst composed of titanium dioxide. This titanium dioxide powder was pulverized to prepare a titanium dioxide powder (c) for a honeycomb exhaust gas treatment catalyst composed of titanium dioxide. The peak height X of the (101) plane of the anatase-type titanium dioxide crystal (101) measured by the powder X-ray diffraction method of the titanium dioxide powder (c) for the honeycomb exhaust gas treatment catalyst composed of titanium dioxide is 177 mm, compared with the peak intensity of the reference sample The ratio (X / Y) was 1.17.

[0067] In addition, in this titanium dioxide powder (c), the crystallite particle size calculated by Scherrer's formula in the anatase type crystal (101) plane is 21.2 nm, and the sulfate radic...

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Abstract

Provided is a raw material for a honeycomb exhaust gas treatment catalyst composed of a powder of titanium dioxide and / or titanium composite oxide, which has excellent extrusion moldability of a honeycomb structure, and a catalyst using the raw material, which has high decomposition activity of an organic halogen compound and Catalyst with high denitrification activity. A titanium dioxide powder for a honeycomb exhaust gas treatment catalyst and a honeycomb exhaust gas treatment catalyst using the titanium dioxide powder. The titanium dioxide powder for honeycomb exhaust gas treatment catalysts is a titanium dioxide powder for honeycomb exhaust gas treatment catalysts composed of titanium dioxide and / or titanium composite oxide, and is characterized by having the following properties: (a) using powder X-ray diffraction The peak intensity ratio of the (101) surface of the anatase titanium dioxide crystal of the titanium dioxide powder relative to the reference sample measured by the method is within a specific range; (b) the crystallite size of the (101) surface of the anatase crystal is within a specific range Within the range of ~22nm; (c) contains 0.3 ~ 5.0% by weight of sulfate (SO4).

Description

technical field [0001] The present invention relates to a titanium dioxide powder for a honeycomb exhaust gas treatment catalyst and a honeycomb exhaust gas treatment catalyst using the titanium dioxide powder, and more specifically relates to a titanium dioxide (hereinafter sometimes referred to as titanium oxide) and / or titanium composite oxide. Titanium dioxide powder for honeycomb waste gas treatment catalyst and the honeycomb waste gas treatment catalyst using the titanium dioxide powder, wherein said titanium dioxide powder can efficiently remove waste gas produced mainly by boilers burning heavy oil or coal, thermal power plants, steel plants, etc. Nitrogen oxides and organic halogen compounds, ammonia, carbonyl sulfide, volatile organic compounds, etc. Background technique [0002] The combustion exhaust gas emitted from combustion furnaces of various factories such as thermal power plants and steel factories, and incinerators for processing municipal waste and indus...

Claims

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Application Information

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IPC IPC(8): B01J21/06B01J35/04B01D53/86B01D53/94
CPCB01J21/063B01J35/56B01J27/053B01J35/30B01D53/8628
Inventor 足立健太郎福田盛男
Owner JGC CATALYSTS & CHEM LTD
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