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Molecular sieve based catalyst used for low-temperature SCR denitration and its preparation method

A molecular sieve base and catalyst technology, applied in the field of molecular sieves, can solve the problems of poor sulfur resistance, insufficient mechanical strength, poor water resistance, etc., and achieve the effects of rich micropore structure, good selectivity, and high specific surface area

Inactive Publication Date: 2014-02-26
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are a large number of hydroxyl groups on the surface of Al2O3, which is conducive to the oxidation of NO into NO2, which can increase the reaction rate, but the anti-sulfur performance is poor. The national invention patent with the authorized public number CN100473456C discloses a catalyst for SCR denitrification of boiler low-temperature flue gas And preparation method, take active carbon as carrier, use impregnation method to load the oxides of manganese and cerium on it
The catalyst uses activated carbon fiber as a carrier, which has a large surface area and strong adsorption capacity for gaseous substances, but its disadvantages are poor water resistance, insufficient mechanical strength, and the catalyst is not easy to shape

Method used

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  • Molecular sieve based catalyst used for low-temperature SCR denitration and its preparation method
  • Molecular sieve based catalyst used for low-temperature SCR denitration and its preparation method
  • Molecular sieve based catalyst used for low-temperature SCR denitration and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Dissolve 0.492 g of sodium metaaluminate (aluminum source) and 3.6 g of sodium hydroxide in 15.8 g of deionized water and stir to dissolve them completely. 2.3 g of choline chloride were added to the mixture and stirred for 15 minutes to completely dissolve it. Slowly add 18 g of LUDOX-AS-40 silica sol (silicon source) dropwise under rapid stirring.

[0066] After stirring at room temperature for one hour, the final colloid was divided into two parts (A and B), and A and B were respectively transferred to a stainless steel autoclave lined with Teflon, placed in an oven at 140 °C and kept for 4 days ( for A) and 6 days (for B).

[0067] The product was washed with deionized water, collected by filtration, dried in a vacuum oven at 100°C for 12 hours, and then calcined in a muffle furnace at 550°C for 8 hours to remove the structure-directing agent to obtain SSZ-13 molecular sieves, in which A and B were two The XRD spectrum of the SSZ-13 molecular sieve prepared by the...

Embodiment 2

[0070] Dissolve 0.853 g of sodium metaaluminate (aluminum source) and 3.0 g of sodium hydroxide in 15.8 g of deionized water and stir to dissolve completely. 1.8 g of choline chloride was added to the mixture and stirred for 15 minutes to completely dissolve it. Slowly add 17.25 g of LUDOX-AS-40 colloidal silica (silicon source) dropwise under rapid stirring.

[0071] After stirring for one hour at room temperature, the final colloid was divided into two parts (A and B), and A and B were transferred to a stainless steel autoclave lined with Teflon, respectively, and placed in an oven at 130 °C (for A) and 150°C (for B) and hold for 6 days.

[0072] The product was washed with deionized water, collected by filtration, dried in a vacuum oven at 100°C for 12 hours, and then calcined in a muffle furnace at 550°C for 8 hours to remove the structure-directing agent to obtain SSZ-13 molecular sieves, in which A and B were two The XRD spectrum of the SSZ-13 molecular sieve prepared ...

Embodiment 3

[0075] Compared with Example 1, the only difference is that the specific selection and molar dosage ratio of the molecular sieve crystal materials in this example are different, specifically:

[0076]

[0077] In this embodiment, the tetravalent silicon source is sodium silicate, the trivalent aluminum source is pseudoboehmite, the alkali metal compound is sodium hydroxide, and the hydroxide ion is provided in the form of sodium hydroxide.

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Abstract

The invention relates to a low-temperature denitration SCR (selective catalytic reduction) catalyst, which includes a Cu modified molecular sieve carrier and one or more oxides of Ce, Zr, and Mn. The employed carrier is a Cu-SSZ-13 molecular sieve that is synthesized by a cheap template route and then undergoes modification. The catalyst provided by the invention has a nitrogen oxide removal rate up to 62-100% in the range of 100-250DEG C, and the low-temperature catalyst involved in the invention has good sulfur-resisting capacity.

Description

technical field [0001] In the field of molecular sieves, the present invention provides a molecular sieve-based catalyst for low-temperature SCR denitrification and a preparation method thereof. Background technique [0002] Along with the continuous growth of energy consumption, stationary sources such as coal-fired boilers and mobile sources such as internal combustion engines of motor vehicles emit more and more nitrogen oxides (NOx) into the atmosphere. Nitrogen oxides (NOx) are one of the main pollutants in the atmospheric environment. They can form photochemical smog, produce acid rain and acid fog, and can also destroy the ozone layer. They are not only harmful to the environment, but also harmful to human health. They can cause respiratory diseases. Therefore, the control and treatment of nitrogen oxide pollution has always been a research hotspot in the international field. [0003] Ammonia Selective Catalytic Reduction (SCR) has become the current mainstream denit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/78B01D53/90B01D53/56
Inventor 张润铎陈标华徐瑞年
Owner BEIJING UNIV OF CHEM TECH
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