Process for preparing denitrification catalyst

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...

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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