High-activity and strong-sulfur-resistance catalyst for selectively catalytically reducing NOx (Nitrogen Oxide) at low temperature

A technology of catalyst and sulfur resistance, which is applied in the field of selective catalytic reduction to remove NOx at low temperature and catalyst with high sulfur resistance and its preparation. It can solve the problems of no reactivity and achieve strong resistance to sulfur poisoning and cost reduction. , cost-effective effect

Inactive Publication Date: 2013-04-17
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the suitable activation temperatures of these catalysts are all medium and high temperatures, and they basically have no applicable reactivity in the low temperature range.

Method used

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  • High-activity and strong-sulfur-resistance catalyst for selectively catalytically reducing NOx (Nitrogen Oxide) at low temperature

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1. Preparation of catalyst

[0024] (1) Preparation of chromium-manganese impregnation solution:

[0025] Add 8.08g of chromium nitrate and 7.42g of manganese acetate into 25mL of citric acid solution with a concentration of 1mol / L, and stir at room temperature for 3 hours to obtain a mixed solution;

[0026] (2) Impregnation of the carrier:

[0027] Using solution impregnation method, take 10g γ-Al 2 o 3 The carrier is immersed in the mixed solution obtained in step (1), and the temperature is raised to 60° C., while stirring continuously until all the water is evaporated to obtain a mixture;

[0028] (3) Activation of samples:

[0029]Dry the mixture obtained in step (2) at 100°C for 12 hours, and bake at 650°C for 5 hours;

[0030] (4) Forming of the catalyst:

[0031] The sample obtained in step (3) is pressed into tablets under a pressure of 10 kPa, and then ground and sieved to obtain 40-60 mesh particles to obtain the catalyst.

[0032] The X-ray diffracti...

Embodiment 2

[0036] The catalyst prepared in Example 1 was used for NO x Reaction, the reaction temperature is controlled at 120°C, and simulated flue gas is introduced: NO 1000ppm, NH 3 1000ppm, N 2 For balance. The total gas flow rate is 860mL·min -1 , Airspeed 10000h -1 , NO after stabilization x The conversion rate is 87.8%. Raise the reaction temperature to 360 °C, after stabilization, NO x The conversion rate is 92.7%.

Embodiment 3

[0038] Get the catalyst prepared in embodiment 1 and be used for NO x For removal reaction, the reaction temperature is controlled at 160°C, and simulated flue gas is introduced: NO 1000ppm, NH 3 1000ppm, N 2 For balance. The total gas flow rate is 860mL·min -1 , airspeed 30000h -1 . SO 2 Concentration increased to 200ppm to detect NO x removal efficiency, NO after 6 hours x The conversion rate was 83.6%.

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Abstract

The invention discloses a high-activity and strong-sulfur-resistance catalyst for selectively catalytically reducing NOx (Nitrogen Oxide) at a low temperature as well as a preparation method and application thereof. The catalyst is a supported catalyst which is provided with a CrMn1.5O4 active crystal phase and comprises the following components in percentage by weight: 10-30% of chromium manganese oxide and 70-90% of porous carrier. The preparation method of the catalyst comprises the following steps of: dissolving chromium and manganese metal salts into a citric acid solution; immersing theporous carrier into the mixed solution; raising temperature and agitating until water is evaporated to obtain a mixture; drying the mixture at a temperature of 100-150 DEG C and then roasting the mixture at a temperature of 500-650 DEG C for 2-5 hours; milling the roasted mixture and sieving to obtain the catalyst. In the invention, the low-temperature activity of the catalyst prepared by using the method is better, the efficient removal of the NOx can be realized at a temperature of 180 DEG C and an air speed of 30000 h<-1>, and the removal rate is more than 90%. In the presence of SO2 with high concentration, the sulfur resistance of the catalyst is better.

Description

technical field [0001] The invention belongs to the technical field of atmospheric purification, in particular to an ammonia selective catalytic reduction (NH 3 -SCR) method to remove NO at low temperature x Catalyst with high sulfur resistance and its preparation method and application. Background technique [0002] Selective catalytic reduction of ammonia (NH 3 -SCR) is the most effective and commercialized method for removing nitrogen oxides emitted from stationary sources such as thermal power plants. in traditional NH 3 - In SCR technology, according to the installation position of the SCR reactor relative to the electrostatic precipitator, the SCR technology can be divided into two methods: high dust content process and low dust content process. In the high dust content process, the SCR reactor is arranged between the boiler economizer and the air preheater. The advantage of this arrangement is that the flue gas temperature is high and the catalyst activity require...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/34B01J29/48B01D53/56B01D53/86
Inventor 李雪辉卢嫦凤于英豪王芙蓉王乐夫
Owner SOUTH CHINA UNIV OF TECH
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