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Zeolite imidazole framework structure composite material for removing NOx, preparation method and application

A technology of zeolite imidazolate and composite materials, applied in chemical instruments and methods, separation methods, catalyst activation/preparation, etc., can solve the problem that the nitrogen oxides to be treated have high temperature requirements, it is difficult to obtain catalytic purification effects, and the active component vanadium Biotoxicity and other problems, to achieve the effect of easy promotion, strong practicability and simple preparation method

Active Publication Date: 2018-05-18
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

where V 2 o 5 -WO 3 / TiO 2 It is a common commercial catalyst at present. This catalyst has high catalytic activity in the temperature window of 350-500 ° C. However, in practical applications, its application cost is high, and the active component vanadium has biological toxicity when volatilized at high temperature, which is harmful to the environment and Human beings cause poisoning, and the temperature requirements for nitrogen oxides to be treated are relatively high, and it is difficult to obtain a good catalytic purification effect at low temperatures

Method used

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Examples

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Effect test

example 1

[0028] Example 1: The preparation method of the zeolite imidazolate framework structure composite material modified by manganese oxide

[0029] (1) Accurately weigh 3.528g zinc nitrate hexahydrate, 1.944g dimethylimidazole, 0.807g sodium formate, mix with 78.5ml anhydrous methanol, stir magnetically, and add 1.5mL 50% manganese nitrate solution dropwise, keep magnetic stirring 5min.

[0030] (2) The resulting mixed solution was treated under 30 kHz ultrasonic for 5 min.

[0031] (3) The obtained ultrasonically pretreated mixture was put into a 100 mL polytetrafluoroethylene-lined reaction kettle, placed in an oven, and slowly heated to 140° C. for 24 hours.

[0032] (4) The resulting suspension was washed three times with anhydrous methanol, and then dried in an oven at 60°C for 8 hours.

[0033] (5) The obtained solid powder is put into the tube furnace, and after being sealed, 50mL / min of high-purity nitrogen is introduced; the tube furnace is heated to 250°C at a rate of ...

example 2

[0034] Example 2: The preparation method of the manganese oxide modified zeolite imidazolate framework structure composite material

[0035] (1) Accurately weigh 3.528g of zinc nitrate hexahydrate, 1.944g of dimethylimidazole, and 0.807g of sodium formate, mix them with 74ml of anhydrous methanol, stir magnetically, and add 6mL of 50% manganese nitrate solution dropwise, and keep stirring magnetically for 5min.

[0036] (2) The resulting mixed solution was ultrasonically treated at 30 kHz for 10 min.

[0037] (3) The obtained ultrasonically pretreated mixture was put into a 100 mL polytetrafluoroethylene-lined reaction kettle, placed in an oven, and slowly heated to 140° C. for 24 hours.

[0038] (4) The resulting suspension was washed three times with anhydrous methanol, and then dried at 60° C. for 12 h.

[0039] (5) The obtained solid powder is put into the tube furnace, and after being sealed well, 50mL / min of high-purity nitrogen is introduced; the tube furnace is heated...

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Abstract

The invention discloses a zeolite imidazole framework structure composite material for removing NOx, a preparation method and an application. The preparation method includes the steps: uniformly mixing soluble salt of manganese, raw materials needed by synthesis of the zeolite imidazole framework structure composite material and solvents to prepare manganese oxide modified zeolite imidazole framework structure composite material by a solvothermal method. The weight ratio of the solvents, the soluble salt of the manganese to the raw materials needed by synthesis of the zeolite imidazole framework structure composite material is (8-10): (0.2-0.75):1. According to the composite material, aggregation and inactivation of the manganese oxide at the reaction temperature are avoided by the aid oflarge surface area of the zeolite imidazole framework structure composite material, a temperature window is widened, nitrogen oxide is efficiently catalyzed and removed at low temperature, and the catalytic activity of a catalyst is improved.

Description

technical field [0001] The invention belongs to the technical field of air pollutant control, in particular to a x The removed manganese oxide modified zeolite imidazolate framework structure composite material, its preparation method and application. Background technique [0002] Nitrogen oxides (mainly including NO and NO 2 ) is a common gas pollutant, and its treatment has been an important content of environmental protection for a long time. Its sources are mainly divided into mobile sources and stationary sources. Stationary sources mainly refer to the combustion of fossil fuels such as industrial production (such as coal and oil) combustion), the mobile source mainly refers to the emission of motor vehicle exhaust. With the rapid development of modern industrialization and the extensive development and use of fossil fuels, the nitrogen oxides emitted into the atmosphere far exceed the carrying capacity and self-purification capacity of the atmospheric environment. N...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/22B01J37/10B01D53/90B01D53/56
CPCB01D53/8628B01D53/90B01D2251/2062B01D2258/0283B01J31/0244B01J31/1691B01J37/10B01J2531/0241B01J2531/72
Inventor 王睿陈永亮
Owner SHANDONG UNIV
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