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Process for preparing denitrification catalyst

A denitrification catalyst and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve problems such as environmental pollution and catalysts that cannot achieve denitrification effects, and achieve firm structure, rich internal voids, and air velocity Improved effect

Inactive Publication Date: 2013-02-13
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problems that the existing denitrification agent cannot meet the needs of the gas internal combustion engine, which has caused the gas internal combustion engine to fail to achieve the ideal denitrification effect due to the lack of a suitable catalyst for a long time, and is likely to cause pollution to the environment. Preparation method of denitration catalyst with layer structure

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Choose C content greater than 90%, specific surface area greater than 1000m 2 / g of powdered activated carbon or 20 grams of granular activated carbon, after drying at 150-170 ° C, ball milled in a dry state for 6 hours to obtain powdered activated carbon with a particle size of 0.1-1 micron, and then mix the ball-milled powdered activated carbon to 1000 grams In the solution, the solution is an alcohol amine aqueous solution of 8%% by volume, and then ball milled in a wet state for no less than 10 hours, and after standing for 24 hours, the suspension is taken for subsequent use. At this time, the diameter of the activated carbon particles in the suspension is less than 1 micron; the alcohol amine aqueous solution is one or a mixture of monoethanolamine, diethanolamine, triethanolamine or methyldiethanolamine.

[0028] Dissolve 1 g of ammonium metavanadate, 2 g of titanium nitrate, and 5 g of aluminum nitrate into 72 g of suspension after mixing, adjust the pH to 4-4....

Embodiment 2

[0034] Choose C content greater than 90%, specific surface area greater than 1000m 2 / g of powdered activated carbon or 50 grams of granular activated carbon, dried at 150-170 ° C and ball milled in a dry state for 6 hours to obtain powdered activated carbon with a particle size of 0.1 to 1 micron, and then mixed the ball-milled powdered activated carbon to 1000 grams In the solution, the solution is a 30% volume ratio alcoholamine aqueous solution, and then ball milled in a wet state for no less than 10 hours, after standing for 24 hours, take the suspension for subsequent use, at this time, the diameter of the active carbon particles in the suspension is less than 1 micron; the alcohol amine aqueous solution is one or more mixtures of monoethanolamine, diethanolamine, triethanolamine or methyldiethanolamine.

[0035] Dissolve 5 grams of ammonium metavanadate, 8 grams of titanium nitrate, and 15 grams of aluminum nitrate into 28 grams of suspension after mixing, adjust the p...

Embodiment 3

[0041] Choose C content greater than 90%, specific surface area greater than 1000m 2 / g of powdered activated carbon or granular activated carbon 35 grams, after drying at 150-170 ° C, ball milled in a dry state for 6 hours to obtain powdered activated carbon with a particle size of 0.1-1 microns, and then mix the ball-milled powdered activated carbon to 1000 grams In the solution, the solution is an alcohol amine aqueous solution of 8%% by volume, and then ball milled in a wet state for no less than 10 hours, and after standing for 24 hours, the suspension is taken for subsequent use. At this time, the diameter of the activated carbon particles in the suspension is less than 1 micron; the alcohol amine aqueous solution is one or a mixture of monoethanolamine, diethanolamine, triethanolamine or methyldiethanolamine.

[0042] Dissolve 3 grams of ammonium metavanadate, 5 grams of titanium nitrate, and 10 grams of aluminum nitrate into 42 grams of suspension after mixing, adjust...

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Abstract

The invention relates to a process for preparing a denitrification catalyst. The process is characterized by comprising the following steps of: firstly, selecting and mixing powdered activated carbon or granular activated carbon which has the C content of more than 90 percent and the specific surface area of more than 1000 m<2> / g into an alcohol amine solution to obtain a suspension liquid for later use; secondly, dissolving a mixed solution of ammonium metavanadate, titanium nitrate and aluminium nitrate in the suspension liquid according to the mass ratio of 10-50 percent to form a sizing agent A; thirdly, dissolving a mixed solution of manganese nitrate, ferric nitrate and copper nitrate in the suspension liquid to form a sizing agent B, coating a carrier with the sizing agent A, drying to a constant weight and then heating to 530-570 DEG C under the protective atmosphere, and carrying out heat preservation for 3-5 hours and subsequently cooling to the room temperature at a temperature reduction speed; and finally, the sizing agent B is coated on the surface of the carrier obtained from the last step, the carrier is dried to a constant weight and then heating to 630-670 DEG C under the atmosphere containing 70 percent of N2, 20 percent of CO2 and 10 percent of CO, carrying out heat preservation and then cooling to the room temperature at a temperature reduction speed to achieve the catalyst in which pores and channels are communicated and are in a two-layer structure. The space velocity of the catalyst can be improved by more than 60 percent, and the resistance is reduced by more than 45 percent, so that a small-sized catalyst device is achieved.

Description

technical field [0001] The invention relates to a catalyst, in particular to a catalyst for tail gas treatment of gas equipment, in particular to a preparation method of a denitrification catalyst. Background technique [0002] Gas internal combustion engines have a wide range of applications in the fields of gas fuel power generation and combined heat and power supply. In terms of resource utilization, they have played an important role in energy utilization. With the continuous deepening of energy saving and emission reduction work in our country, the application scale of gas internal combustion engines will become larger and larger. [0003] Affected by the working principle of combustion, the emission concentration of nitrogen oxides in the tail gas of gas internal combustion engines is relatively high, often in the range of 600~1000mg / Nm 3 This is mainly due to the large air-to-fuel ratio of the gas internal combustion engine, sufficient combustion, and hig...

Claims

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Application Information

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IPC IPC(8): B01J23/889B01D53/94B01D53/56
Inventor 陈泽智龚惠娟马莎莎虞辉余珉王梦秋樊杨梅
Owner NANJING UNIV
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