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High sulfur-resistant medium and low temperature denitration catalyst as well as preparation and application thereof

A technology of denitrification catalyst and catalytic activity, which is applied in the field of high sulfur resistance medium and low temperature denitrification catalyst, can solve the problems of poor SCR activity and deactivation, and achieve the effects of low cost, improved removal rate and high tolerance

Inactive Publication Date: 2019-07-19
RENMIN UNIVERSITY OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it was found through experimental tests that CeO 2 The SCR activity is poor (Different exposed facets VO x / CeO2 catalysts for the selective catalytic reduction of NO with NH3), and is also susceptible to SO in flue gas 2 inactivated by poisoning

Method used

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  • High sulfur-resistant medium and low temperature denitration catalyst as well as preparation and application thereof
  • High sulfur-resistant medium and low temperature denitration catalyst as well as preparation and application thereof
  • High sulfur-resistant medium and low temperature denitration catalyst as well as preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Ce 1 Cr 3 o x Sample preparation:

[0067] (1) take by weighing 12g chromium nitrate nonahydrate, 4.34g cerium nitrate hexahydrate for subsequent use;

[0068] (2) Dissolve the weighed cerium salt and chromium salt in 20mL deionized water respectively;

[0069] (3) Mix the solutions completely dissolved in (2) successively and stir evenly;

[0070] (4) Measure 50 mL of ammonia water and add it dropwise to the solution obtained in (3), so that the pH value in the final system is 9±0.5, and stir at room temperature for about 2 hours;

[0071] (5) After stopping the stirring, let it stand for 1h to make the precipitated crystal grains aggregate and grow;

[0072] (6) The substance obtained in (5) was subjected to suction filtration, the filter cake was washed 5 times with deionized water, and then put into an oven at 110° C. for 12 hours to obtain a semi-finished product;

[0073] (7) Put the obtained semi-finished product into a muffle furnace, and roast it under th...

Embodiment 2

[0076] Vulcanized Ce 1 Cr 3 o x Sample preparation:

[0077] (1) take by weighing 12g chromium nitrate nonahydrate, 4.34g cerium nitrate hexahydrate for subsequent use;

[0078] (2) Dissolve the weighed cerium salt and chromium salt in 20mL deionized water respectively;

[0079] (3) Mix the solutions completely dissolved in (2) successively and stir evenly;

[0080] (4) Measure 50 mL of ammonia water and add it dropwise to the solution obtained in (3), so that the pH value in the final system is 9±0.5, and stir at room temperature for about 2 hours;

[0081] (5) After stopping the stirring, let it stand for 1h to make the precipitated crystal grains aggregate and grow;

[0082] (6) The substance obtained in (5) was subjected to suction filtration, the filter cake was washed 5 times with deionized water, and then put into an oven at 110° C. for 12 hours to obtain a semi-finished product;

[0083] (7) Put the obtained semi-finished product into a muffle furnace, and roast ...

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Abstract

The invention provides a high sulfur-resistant medium and low temperature denitration catalyst as well as preparation and application thereof. The denitration catalyst takes a cerium and chromium compound oxide as a catalytic active component and also can be doped with transition metal M for modification. Compared with the prior art, the denitration catalyst provided by the invention has the advantages of greenness, no toxicity, low cost, high activity, high anti-sulfur resistance and the like; by introducing component Cr into a CeO2 catalyst and carrying out presulfurization treatment, the removal rate of NOx is increased while sulfur resistance is improved at the same time. The high sulfur-resistant medium and low temperature denitration catalyst disclosed by the invention has better activity in the test interval of 100 to 450 DEG C and higher tolerance to SO2.

Description

technical field [0001] The invention belongs to the technical field of purification treatment of nitrogen oxides in the technical field of environmental protection, and specifically relates to a high-sulfur-resistant medium-low temperature denitrification catalyst and its preparation and application. Background technique [0002] Stationary source flue gas contains a large amount of nitrogen oxides (NO x ), not only affect the ecological environment, but also have great harm to the human body. Nitrogen oxides are closely related to ozone concentration and photochemical pollution. They are important precursors for inducing photochemical smog and acid rain and acid smog. They may also destroy the ozone layer and cause secondary pollution. At the same time, nitrogen oxides have also become an important source of atmospheric particulate matter pollution and haze, which may damage the human respiratory system and stimulate the lungs. Data show that the acid rain in our country ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/26B01D53/56B01D53/86
CPCB01D53/56B01D53/8628B01D2251/2062B01D2258/0283B01J23/002B01J23/26
Inventor 张涛常化振秦萱
Owner RENMIN UNIVERSITY OF CHINA