Preparation method of anti-water-type low-temperature NH3-SCR catalyst, catalyst prepared therewith and application of the catalyst

A technology of catalysts and composite oxides, applied in the direction of physical/chemical process catalysts, metal/metal oxides/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the problems of catalyst water resistance and achieve good NH3- The effects of SCR water resistance, simple and quick preparation method, and excellent catalytic performance

Active Publication Date: 2015-11-11
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In addition, we found that the pore structure of the catalyst has a great influence on the water resistance of the catalyst

Method used

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  • Preparation method of anti-water-type low-temperature NH3-SCR catalyst, catalyst prepared therewith and application of the catalyst
  • Preparation method of anti-water-type low-temperature NH3-SCR catalyst, catalyst prepared therewith and application of the catalyst
  • Preparation method of anti-water-type low-temperature NH3-SCR catalyst, catalyst prepared therewith and application of the catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1. Mn 0.2 Ti 0.8 o 2 sample preparation

[0025] Dissolve 0.98g of manganese acetate tetrahydrate in 28mL of absolute ethanol, add 1mL of water and 1mL of glacial acetic acid under magnetic stirring, and stir evenly. 5 mL of tetrabutyl titanate was added to the above solution, and stirred for 30 min. The reaction solution was transferred to a stainless steel hydrothermal reaction kettle with a polytetrafluoroethylene liner of 50 mL, and placed in an oven at 180° C. for 24 h. Cool to room temperature, centrifuge, wash with water and ethanol three times, and dry overnight at 60°C. The obtained sample was calcined in a muffle furnace for 4 hours in an air atmosphere (calcination temperature 550 ° C, heating time 150 min), to obtain Mn 2 Ti 8 sample.

Embodiment 2

[0026] Example 2. Mn 0.2 Ti 0.8-x Si x o 2 Catalyst preparation

[0027] With the Mn prepared in embodiment 1 0.2 Ti 0.8 o 2 Disperse 1 g of the sample in 100 mL of n-hexane, add x mL of hexamethyldisiloxane (0.50.2 Ti 0.8-x Si x o 2 sample. The XRD results showed that the prepared catalysts were all in the anatase crystal form (such as figure 1 ). The BET results show that the pore volume of Si-treated samples increases (as shown in Table 1), and the pore diameter moves toward the large pores (as shown in Table 1). figure 2 ).

[0028] Table 1

[0029]

Embodiment 3

[0030] Example 3. NH of the catalyst 3 -SCR performance evaluation

[0031] The catalyst prepared in embodiment 1,2 is applied to NH 3 -SCR response, Mn 0.2 Ti 0.8-x Si x o 2 and Mn 0.2 Ti 0.8 o 2 The catalysts all showed good low-temperature catalytic activity, indicating that the introduction of the inert species Si did not reduce the activity of the catalyst, such as image 3 shown. The reaction is carried out on a micro-reaction catalytic device, and the reaction gas composition is 500ppmNH 3 , 500ppmNO, 5%O 2 , the residual gas is N 2 , the airspeed is 100,000h -1 , the amount of catalyst used is 0.1g, the temperature of the catalytic reaction is 25-350° C., and the NO conversion rate of the reaction is detected by an infrared method.

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Abstract

A preparation method of an anti-water-type low-temperature NH3-SCR catalyst, the catalyst prepared therewith and an application of the catalyst. The anti-water-type low-temperature NH3-SCR catalyst is a mesoporous Mn<0.2>Ti<0.8-x>Si<x>O<2> composite oxide catalyst. The preparation method includes following steps: (1) dissolving 0.98 g of manganese acetate and 5 ml of tetrabutyl titanate in 20 ml of an ethanol solution; (2) adding 1 ml of acetic acid and 1 ml of water to promote hydrolysis; (3) intensively stirring the mixture uniformly and filling a hydrothermal reaction kettle with the mixture as a reactant; (4) performing a reaction at 180 DEG C for 24 h; (5) performing centrifugation, washing and drying to a product to obtain nano particles of a Mn0.2Ti0.8O2 composite oxide; (6) dispersing the composite oxide in cyclohexane, adding 0.5-5 ml of hexamethyl disiloxane, stirring the mixture for 24 h and washing and drying the mixture; and (7) finally roasting the product at 550 DEG C in air for 4 h to obtain the mesoporous Mn<0.2>Ti<0.8-x>Si<x>O<2> composite oxide catalyst. The preparation method is low in raw material cost and allows the raw material to be obtained easily, is simple in processes and devices and is environment-friendly. The catalyst has a mesoporous structure and is high in pore volume. Compared with a catalyst without pore structure regulation, the catalyst in the invention is better in NH3-SCR anti-water performance.

Description

Technical field: [0001] The invention relates to a preparation method of a mesoporous manganese-titanium composite oxide catalyst and its application in flue gas denitrification of stationary sources (coal-fired power plants, industrial furnaces, etc.). Background technique: [0002] With the development of industry, various pollution problems have become more and more serious, and air pollution is one of them. Nitrogen oxides (NOx) are major air pollutants, mainly derived from the combustion of fossil fuels such as coal and petroleum products. Power plants, steel mills and other high-energy-consuming factories are one of the main sources of emissions. Currently, successfully operating commercial NH 3 -SCR catalyst is a V 2 o 5 -WO 3 (or MO 3 ) / TiO 2 catalyst. The catalyst is characterized by the NO x The removal efficiency is over 80%, and it has good anti-sulfur performance. The working temperature is 280-420°C. [0003] Mn-based catalyst as a low-temperature NH ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01D53/56B01D53/90
Inventor 董林虞硕涵李露露汤常金高飞
Owner NANJING UNIV
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