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Catalyst for simultaneous denitration and demercuration on smoke gas as well as preparation method and application thereof

A catalyst and flue gas technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of high catalytic activity, high cost, toxicity, etc., and achieve the effect of good removal efficiency and low cost.

Active Publication Date: 2018-10-23
LINYI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among the existing patents, (CN102218266) uses TiO 2 As the support body, with V 2 o 5 It is an active component with high catalytic activity, but it is expensive and toxic

Method used

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  • Catalyst for simultaneous denitration and demercuration on smoke gas as well as preparation method and application thereof
  • Catalyst for simultaneous denitration and demercuration on smoke gas as well as preparation method and application thereof
  • Catalyst for simultaneous denitration and demercuration on smoke gas as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Preparation of dealkalized red mud

[0028] Pass the dried red mud through a 200-mesh sieve and transfer it to a polytetrafluoroethylene-lined hydrothermal reactor, and add it into the mixed acid solution according to the amount of 1g red mud / 10mL acid solution, wherein the mixed acid solution is composed of 3mol / L hydrochloric acid and Nitric acid is mixed according to the volume ratio of 1:5. The hydrothermal reactor was crystallized at 90°C for 12 hours, washed with deionized water for 3 to 5 times, filtered, and dried in an oven at 100°C. Marked as ARM-1.

[0029] (2) Preparation of catalyst

[0030] The acidified dealkalized red mud was impregnated with Mn(NO 3 ) 2 solution (0.5mol / L), stirred at room temperature for 4 h, dried in an oven at 80 °C for 24 h, and calcined at 500 °C for 4 h to obtain a 3wt% Mn-ARM-1 catalyst. Press the powder catalyst into tablets, grind and screen 40-60 mesh particles to obtain MnO x Modified red mud catalyst.

[0031] (3)...

Embodiment 2

[0034] Prepare MnO according to the method of embodiment 1 x The difference of the modified dealkalized red mud catalyst is that the hydrothermal crystallization temperature is changed to 60°C, and the obtained catalyst is marked as 3wt.% Mn-ARM-2.

[0035]Catalyst carries out active measurement on the device described in above-mentioned embodiment 1, and the result shows that the catalyst that embodiment 2 makes is 550ppm to NO concentration, Hg 0 Concentration is 50µgL -1 gas (the remaining gas composition is 5% O 2 , 550ppmNH 3 and balance gas N 2 ), at 230°C, at a reaction space velocity of 80,000 h -1 Under these conditions, the removal efficiency of NO exceeds 90%, and the oxidation removal efficiency of Hg exceeds 80%.

Embodiment 3

[0037] Prepare MnO according to the method of Example 1 x The difference of the modified dealkalized red mud catalyst is that the hydrothermal crystallization temperature is changed to 120°C, and the obtained catalyst is marked as 3wt.% Mn-ARM-3.

[0038] Catalyst carries out activity measurement on the device described in above-mentioned embodiment 1, and the result shows that the catalyst that embodiment 3 makes is 550ppm to NO concentration, Hg 0 Concentration is 50µgL -1 gas (the remaining gas composition is 5% O 2 , 550ppmNH 3 and balance gas N 2 ), at 230°C, at a reaction space velocity of 80,000 h -1 Under this condition, the removal efficiency of NO exceeds 84%, and the oxidation removal efficiency of Hg exceeds 75%.

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Abstract

The invention relates to a cheap catalyst for simultaneous denitration and demercuration on smoke gas as well as a preparation method and application thereof, belongs to the technical field of atmospheric pollution control, and particularly relates to a vanadium-free waste reutilization catalyst as well as a preparation method and application thereof. The catalyst comprises carrier red mud and metal oxide parts for modifying the red mud, wherein metal oxides are one or several kinds of materials in manganese and cobalt. The catalyst aims at the problems of high cost and toxicity of the existing catalyst for simultaneous denitration and demercuration. The catalyst provided by the invention uses aluminum making industry waste-red mud as catalyst carriers; the acidification dealkalization treatment is performed; the specific surface area and the porosity of the carrier are obviously improved. The catalyst subjected to manganese or cobalt modification is used for simultaneously performingdenitration and demercuration on the smoke gas which does not contain HCL; the application temperature is higher than 180 DEG C; the air speed is 50,000 to 100,000 h<-1>; the efficient removal can berealized on nitric oxides and elemental mercury in the smoke gas.

Description

technical field [0001] The invention relates to an inexpensive catalyst for simultaneous denitrification and demercuration of flue gas, which belongs to the technical field of air pollution control, and in particular relates to a vanadium-free catalyst for recycling wastes and its preparation method and application. Background technique [0002] Coal-fired power plants produce various air pollutants, among which NO x and mercury are considered to be important air pollutants. With the gradual strictness of environmental protection standards, NO x The control and treatment of mercury and mercury have attracted widespread attention. NO in flue gas x Composed of more than 90% NO. Nitrogen oxides are known to cause many environmental problems such as acid rain and photochemical smog. Mercury is one of the most dangerous environmental poisons, threatening the ecological environment and human health due to its extreme toxicity, persistence and bioaccumulation. Mercury is usual...

Claims

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Application Information

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IPC IPC(8): B01J23/34B01J23/75B01D53/86B01D53/56B01D53/64
CPCB01D53/8628B01D53/8665B01D2257/602B01D2258/0283B01J23/34B01J23/75
Inventor 马宏卿刘亭田浩廷姚燕
Owner LINYI UNIVERSITY
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