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PrOx-MnOx/SAPO-34 low-temperature SCR smoke denitration catalyst and preparation method and application thereof

A SAPO-34, denitration catalyst technology, applied in physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve problems such as unfavorable continuous operation of factories, easy poisoning and deactivation, etc., and achieve good low-temperature denitration catalytic activity, Conducive to adsorption and improved dispersibility

Active Publication Date: 2016-08-10
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, low-temperature SCR catalysts do not contain SO 2 The flue gas often has good SCR activity, but in actual situations, the flue gas still contains a small amount of SO after passing through the dust removal and desulfurization device. 2 , low-temperature SCR catalysts are prone to poisoning and deactivation under such conditions. Although many catalyst systems can recover their catalytic activity to a large extent after regeneration operations such as high temperature and water washing, frequent regeneration processes are obviously not conducive to the continuous operation of the plant.

Method used

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  • PrOx-MnOx/SAPO-34 low-temperature SCR smoke denitration catalyst and preparation method and application thereof
  • PrOx-MnOx/SAPO-34 low-temperature SCR smoke denitration catalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Dissolution of manganese source: Weigh 2.071g organic manganese source (manganese acetylacetonate II) and fully dissolve it in 60.00mL acetone, stir for 1.0h to obtain a uniform suspension;

[0030] (2) Dispersion of the carrier: Weigh 3.00g SAPO-34 molecular sieve and add it to the suspension in step (1), add 60.00mL acetone, stir well for 1.0h, put the solution in an ultrasonic reactor for 40min ;

[0031] (3) Formation of dry gel: add 0.35625g of praseodymium nitrate to the suspension obtained in step (2), then continue to stir the solution at room temperature until a dark yellow dry gel-like solid is formed;

[0032] (4) Roasting: The powder obtained by drying the colloidal solid obtained in step (3) at 100°C for 12h is placed in a tube furnace and fired at 0.5°C·min in an air atmosphere. -1 Roasted at 300°C for 4 hours, and cooled to room temperature to obtain PrO x -MnO x / SAPO-34 low temperature SCR flue gas denitrification catalyst.

Embodiment 2

[0034] (1) Dissolution of manganese source: Weigh 3.4525g organic manganese source (manganese acetylacetonate II) and fully dissolve it in 60.00mL acetone, stir for 1.0h to obtain a uniform suspension;

[0035] (2) Dispersion of the carrier: Weigh 3.00g SAPO-34 molecular sieve and add it to the suspension in step (1), add 120.00mL acetone, stir well for 1.0h, put the solution in the ultrasonic reactor for 80min ;

[0036] (3) Formation of dry gel: add 1.06875g of praseodymium nitrate to the suspension obtained in step (2), then continue to stir the solution at room temperature until a dark yellow dry gel-like solid is formed;

[0037] (4) Roasting: The powder obtained by drying the colloidal solid obtained in step (3) at 100° C. for 12 hours is placed in a tube furnace and roasted in an air atmosphere at 1.5° C. min. -1 Roasted at 500°C for 6h, and cooled to room temperature to obtain PrO x -MnO x / SAPO-34 low temperature SCR flue gas denitrification catalyst.

Embodiment 3

[0039] (1) Dissolution of manganese source: Weigh 2.7620g organic manganese source (manganese acetylacetonate II) and fully dissolve it in 60.00mL acetone, stir for 1.0h to obtain a uniform suspension;

[0040] (2) Dispersion of the carrier: Weigh 3.00g SAPO-34 molecular sieve and add it to the suspension in step (1), and add 60.00mL acetone, stir thoroughly for 1.0h, then place the solution in an ultrasonic reactor for ultrasonic treatment for 60min ;

[0041] (3) Formation of dry gel: add 0.7125g of praseodymium nitrate to the suspension obtained in step (2), then continue to stir the solution at room temperature until a dark yellow dry gel-like solid is formed;

[0042] (4) Roasting: The powder obtained by drying the colloidal solid obtained in step (3) at 100°C for 12h is placed in a tube furnace and fired at 1°C·min in an air atmosphere. -1 Roast at 400°C for 5h, and cool to room temperature to prepare PrO x -MnO x / SAPO-34 low temperature SCR flue gas denitrification ...

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Abstract

The invention discloses a PrOx-MnOx / SAPO-34 low-temperature SCR smoke denitration catalyst and a preparation method and application thereof .In the preparation method, an SAPO-34 molecular sieve serves as the carrier, Mn and Pr are loaded on the SAPO-34 molecular sieve through a solvent dispersion method, and then the PrOx-MnOx / SAPO-34 low-temperature SCR smoke denitration catalyst is prepared through roasting; in the PrOx-MnOx / SAPO-34 low-temperature SCR smoke denitration catalyst, the mass percentage of Mn and the SAPO-34 molecular sieve is 15-25%, and the molar ratio of Pr to Mn is 0-0.3 .The dispersity of active components is improved, the specific surface area and acidity of the catalyst are increased, and the catalyst presents excellent NH3-SCR performance at a low temperature of 200 DEG C or below and has certain SO2 poisoning resistant performance .

Description

technical field [0001] The invention belongs to the field of environmental protection and environmental catalysis, in particular to a PrO x -MnO x / SAPO-34 low-temperature SCR flue gas denitrification catalyst and its preparation method and application. Background technique [0002] Most anthropogenic nitrogen oxides (Nitrogen oxides, NO x ) emissions from stationary sources, which will cause environmental problems such as photochemical smog, acid rain, and ozone holes, and cause serious harm to human health and the ecological environment. How to effectively control and reduce NO x The emissions have attracted the attention of researchers from various countries. In 2015, the emission of nitrogen oxides exceeded 28 million tons, and most of them came from stationary sources of nitrogen oxides such as electric power, heat production and supply industries. Therefore, controlling the emission of stationary sources of nitrogen oxides is the key to the prevention and control of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/85B01D53/86B01D53/56
CPCB01D53/8628B01D2255/50B01J29/85B01J2229/186
Inventor 黄碧纯喻成龙
Owner SOUTH CHINA UNIV OF TECH
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