Titanium dioxide for denitration catalyst and preparation method of titanium dioxide

A denitration catalyst, titanium dioxide technology, applied in the direction of catalyst carrier, chemical instrument and method, physical/chemical process catalyst, etc., can solve the problems of reducing the specific surface area of ​​the catalyst, inactivating the catalyst, shortening the service life, etc., and reaching the temperature range suitable for denitration Wide, no pollutant emission, small production investment effect

Active Publication Date: 2014-04-30
山东水发环境治理有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in practical applications, the crystal form of anatase titanium dioxide is easily affected by high temperature and undergoes phase transformation. When it is applied to a denitration catalyst carrier, when the flue gas reaches above 600°C, the anatase titanium dioxide grains continue to grow and transform into large grains of rutile. Type titanium dioxide, which eventually leads to a decrease in the specific surface area of ​​the catalyst, loss of activity of the catalyst, low denitrification efficiency, and shortened service life

Method used

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  • Titanium dioxide for denitration catalyst and preparation method of titanium dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1) Grind 85 parts by weight of anatase titanium dioxide and 1 part by weight of α-molybdenum silicate in a vibrating mill for 20 minutes at a speed of 500 r / min. The particle size decreases, the specific surface area increases, and the Gibbs free energy increases, thereby promoting the occurrence of mechanochemical effects. The lattice modifier extends into the lattice on the surface of the anatase titanium dioxide particle, increasing the surface lattice gap;

[0038] 2) Mix the titanium dioxide microparticles obtained in step 1) with 10 parts by weight of polymethylcarbosilane and evenly send them into a twin-screw extruder for extrusion and granulation;

[0039] 3) The pellets obtained in step 2) were carbonized at 400° C. for 20 minutes to obtain fluffy titanium dioxide for denitration catalyst.

[0040] The obtained samples were calcined at 200°C, 500°C, 800°C, 1100°C, and 1300°C for 5 hours at high temperatures, and the changes in crystal phase structure and speci...

Embodiment 2

[0042] 1) Grind 90 parts by weight of anatase titanium dioxide and 2 parts by weight of aluminum phosphate in a vibratory mill for 15 minutes at a grinding speed of 400 r / min, and the grain size of anatase titanium dioxide decreases during the process of vibrating mill refinement , the specific surface area increases, and the Gibbs free energy increases, thereby promoting the occurrence of mechanochemical effects. The lattice modifier extends into the lattice on the surface of the anatase titanium dioxide particle, increasing the surface lattice gap;

[0043] 2) Mix the titanium dioxide particles obtained in step 1) with 8 parts by weight of polymethylethoxycarbosilane and evenly send them into a twin-screw extruder for extrusion and granulation;

[0044] 3) The pellets obtained in step 2) were carbonized at 300° C. for 20 minutes to obtain fluffy titanium dioxide for denitration catalyst.

Embodiment 3

[0046] 1) Grind 85 parts by weight of anatase titanium dioxide and 1 part by weight of bismuth phosphate in a vibratory mill for 10 minutes at a grinding speed of 450 r / min, and the grains of anatase titanium dioxide are reduced in the process of vibrating mill refinement , the specific surface area increases, and the Gibbs free energy increases, thereby promoting the occurrence of mechanochemical effects. The lattice modifier extends into the lattice on the surface of the anatase titanium dioxide particle, increasing the surface lattice gap;

[0047] 2) Mix the titanium dioxide microparticles obtained in step 1) with 5 parts by weight of polymethyltrifluoropropylcarbosilane and send them into a twin-screw extruder for extrusion and granulation;

[0048] 3) The pellets obtained in step 2) were carbonized at 350° C. for 20 minutes to obtain fluffy titanium dioxide for denitration catalyst.

[0049] The obtained sample was calcined at 800°C for 5 hours, and the BET specific surf...

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Abstract

The invention discloses titanium dioxide for a denitration catalyst and a preparation method of the titanium dioxide. The titanium dioxide for the denitration catalyst is characterized by consisting of industrial-grade anatase titanium dioxide and a carbon silicon polymer, and specifically comprising the following components in parts by weight: 85-90 parts of anatase titanium dioxide, 5-10 parts of carbon silicon polymer and 1-3 parts of crystal lattice modifying agents. The preparation method disclosed by the invention comprises the following steps: refining the industrial-grade anatase titanium dioxide to be micron level by mechanical force fine dispersion, extending a crystal lattice modifying agent into crystal lattices on the surfaces of anatase titanium dioxide micron particles so as to increase surface crystal lattice clearances, further mixing and dispersing a carbon silicon polymer in a conical screw extruder so as to enable the silicon carbon reactive bond Si-C and the surface hydroxyl group of titanium dioxide to form Ti-C-Si, thereby forming stable crystal lattice clearances. Crystal particles are effectively prevented from growing at high temperature, and when the titanium dioxide for the denitration catalyst is used for a denitration catalyst carrier, the titanium dioxide for the denitration catalyst not only has small crystal particles and high surface activity, but also is wide in thermal adaptability; when at the temperature above 1100 DEG C, crystal lattice clearances are difficult to grow into rutile types; when an active material V2O5 is loaded, the crystal lattice clearances can prevent the active material and titanium dioxide from undergoing a crystal phase reaction; the activity of the catalyst is ensured and improved, and the service life of the catalyst is ensured and prolonged.

Description

technical field [0001] The invention relates to the field of environmental protection materials, in particular to a carrier material for a flue gas denitration catalyst, the carrier material being titanium dioxide, and further to a preparation method of the titanium dioxide for the denitration catalyst. Background technique [0002] In recent years, there have been large-scale smog weather in my country. Affected by this, the air quality in many places is seriously polluted above level six. The reason is that with the rapid development of the country's economy and industry, the emissions of industrial waste gas, industrial coal, thermal power generation, and automobile exhaust are increasing year by year. In particular, nitrogen oxides (NOX) in coal-burning flue gas emissions form nitric acid in the air, leading to the production of PM2.5 particles, which eventually form smog. Therefore, nitrogen oxides (NOx) have become one of the main harmful substances polluting the atmo...

Claims

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Application Information

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IPC IPC(8): B01J32/00B01J35/10B01J23/22B01D53/56B01D53/86
Inventor 陈庆曾军堂
Owner 山东水发环境治理有限公司
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