A high-temperature catalytic combustion catalyst for washing tail gas with liquid nitrogen, its preparation method and application

Abstract

The invention belongs to the technical field of tail gas combustion catalyst, and especially relates to a liquid nitrogen washed tail gas high temperature catalytic combustion catalyst, and a preparation method and applications thereof. The liquid nitrogen washed tail gas high temperature catalytic combustion catalyst possesses a stable structure and large specific surface area; after 5h of roasting aging of the catalyst at 1000 DEG C in the air, the specific surface area is still larger than 40m<2> / g. The catalyst is capable of realizing stable high efficiency reaction of liquid nitrogen washed tail gas catalytic combustion at 800 DEG C for longer than 10000h, liquid nitrogen washed tail gas catalytic combustion efficiency is extremely high, liquid nitrogen washed tail gas CO concentration can be reduced to be lower than 50ppm, CH4 concentration can be reduced to be lower than 300ppm, H2 can be removed completely, and energy saving emission reducing effect is obvious.

Description

technical field [0001] The invention relates to the technical field of tail gas combustion catalysts, in particular to a high-temperature catalytic combustion catalyst for washing tail gas with liquid nitrogen and its preparation method and application. Background technique [0002] At present, the main method of producing synthetic ammonia in my country is the coal-to-gas process, but the synthetic gas produced from coal needs to be refined to remove impurity components to obtain pure H 2 to avoid poisoning of the subsequent ammonia synthesis catalyst. At present, the use of liquid nitrogen washing method to finely remove trace CO and other impurity components in coal gas is a commonly used process in large-scale ammonia synthesis plants. The crude hydrogen after decarburization is washed and purified by liquid nitrogen and then used to prepare synthetic ammonia, and the tail gas discharged from the liquid nitrogen after absorbing impurity components such as CO in the crud...

AI Technical Summary

Problems solved by technology

However, the calorific value of liquid nitrogen scrubbing tail gas can reach 1200-2100kJ / m 3 , during direct catalytic combustion, the temperature of the reaction catalyst is continuously around 800°C, up to 950°C, and the high temperature of the catalyst center can easily lead to the deactivation of the catalyst due to sintering

At present, the thermal stability of existing catalysts is low, and it is difficult to realize high-temperature catalytic combustion of liquid nitrogen scrubbing tail gas

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