Catalyst with sulfur resistance and function of catalyzing oxidation of NO and preparing method and application of catalyst

A catalytic oxidation and catalyst technology, applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve problems such as deactivation, achieve simple operation, simple process flow, and no secondary pollution Effect

Active Publication Date: 2019-11-05
INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the existing catalysts that are easily deactivated by sulfur-containing gases in the NOCO process, and provide a catalyst for catalytic oxidation of NO with sulfur-resistant properties. Compared with unmodified activated carbon, it is more resistant to sulfur 25-300% performance improvement

Method used

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  • Catalyst with sulfur resistance and function of catalyzing oxidation of NO and preparing method and application of catalyst
  • Catalyst with sulfur resistance and function of catalyzing oxidation of NO and preparing method and application of catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0043] The specific surface area is 1200m 2 / g, coconut shell activated carbon with a particle size of 40-60 mesh was placed in a vacuum drying oven, dried at a vacuum degree of -0.6MPa and a temperature of 80°C for 12 hours, and recorded as sample AC.

[0044] Take 5g of sample AC, place it in a porcelain boat, transfer it into a tube furnace, and inject 50mL of N 2 (99.99vol.%), the temperature was raised to 800°C at a rate of 5°C / min, and calcined for 2 hours; then the temperature was lowered to room temperature at a rate of 5°C / min, and the sample was taken out and recorded as AC-800°C.

[0045] Sample AC and sample AC-800°C were respectively tested for catalytic oxidation of NO at room temperature in sulfur-containing flue gas. The method is as follows: take 0.300g of the sample and fill it into a quartz reaction tube with an inner diameter of 1cm, and feed 800ppmNO, 20vol .%O 2 , N 2 (99.99vol.%) balanced gas mixture, space velocity 120000h -1 . Measure NO and NO ev...

Embodiment 2

[0050] The specific surface area is 1200m 2 / g, coconut shell activated carbon with a particle size of 40-60 mesh is placed in a vacuum drying oven, and dried at a vacuum degree of -0.6MPa and a temperature of 80°C for 12h. Take 5.00g of dried activated carbon and place it in a flask, add 200mL of 0.15wt.%H 3 BO 3 solution, mix well. The flask was placed in an ultrasonic cleaner and ultrasonically oscillated for 30 minutes at a power of 1000W and a temperature of 30°C, then connected to a rotary evaporator, and evaporated and dried in a water bath at a vacuum of -0.01MPa and a temperature of 80°C to obtain uniformly distributed particles on the surface and in the pores. h 3 BO 3 Activated carbon, placed in a porcelain boat, moved into a tube furnace, and injected with 50mL N 2 (99.99vol.%), raised the temperature to 800°C at a rate of 5°C / min, and calcined for 2h; then cooled to room temperature at a rate of 5°C / min, and took it out to obtain B-doped activated carbon BAC1...

Embodiment 3

[0053] Keep other conditions in Example 1 unchanged, H 3 BO 3 The concentration of the solution was changed to 0.30 wt.%, and the prepared catalyst BAC2%-800°C was evaluated under the same test conditions as in Example 1. The activity time of the catalyst in sulfur-containing flue gas is 20h, such as figure 1 As shown, compared with before modification, it is extended by 150%.

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Abstract

The invention relates to a catalyst with sulfur resistance and the function of catalyzing oxidation of NO and a preparing method and application of the catalyst. The catalyst with sulfur resistance and the function of catalyzing oxidation of NO is activated carbon modified by boric acid, wherein the mass content of boron is 0.01-2%. The catalyst is obtained by mixing an aqueous solution of the boric acid with activated carbon powder, conducting rotary evaporation, conducting calcining under a nitrogen atmosphere, and then conducting cooling. The preparing method is simple in technological process, easy to operate and low in cost, and mass production is facilitated; required raw materials are clean, environmentally friendly, and free of hazardous substances, do not cause secondary pollutionand conform to the idea of green chemistry; the prepared modified activated carbon has good sulfur resistance when used for NOCO, and the activity time is prolonged by 25-300% compared with that before modification.

Description

technical field [0001] The invention relates to the field of industrial waste gas treatment, in particular to a catalyst for catalytic oxidation of NO with anti-sulfur performance, a preparation method and application thereof. Background technique [0002] In recent years, nitrogen oxide pollution in the atmosphere has received widespread attention and is considered to be one of the important causes of environmental problems such as photochemical smog, greenhouse effect, smog, and ozone layer depletion. With the rapid development of the national economy, the consumption of fossil fuels in my country has been increasing year by year, and the problem of the associated nitrogen oxide emissions has increased rapidly, and new removal methods are urgently needed to solve it. Nitric oxide catalytic oxidation (NO Catalytic Oxidation, NOCO) supplemented with alkaline solution absorption and removal technology has attracted more and more attention due to its cheapness, greenness and l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/18B01J37/02B01J37/08B01D53/86B01D53/56
CPCB01J21/18B01J37/0201B01J37/08B01D53/8628B01D2257/404Y02A50/20
Inventor 余广炜汪印尤甫天
Owner INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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