Foam type low-temperature flue gas denitration catalyst and preparation method thereof

Abstract

The invention discloses a foam type low-temperature flue gas denitration catalyst and a preparation method thereof. The flue gas denitration catalyst consists of the following components in percentage by weight: 60-80% of titanium dioxide, 1-5% of ammonium metavanadate, 1-5% of ammonium paratungstate, 0.1-1.0% of boric acid and 20-35% of aluminum oxide. The denitration catalyst is foamed and can be used for performing denitration reaction at a temperature of 120-400 DEG C. The foam type low-temperature flue gas denitration catalyst is simple in formula, simple in manufacturing process, capable of greatly lowering the construction cost and the energy consumption, great in surface area, high in catalytic activity, stable in chemical property, good in sulfur resistance and long in service life, can be used for successfully realizing effectively removing a nitric oxide component contained in the flue gas at a relatively low temperature to overcome the defect that the conventional high-temperature catalyst has to be used for further heating the tail gas or has to be adjacent to the position of the flue gas vent hole so as to remove a nitric oxide component. Moreover, a measured light-off temperature is lower than 140 DEG C.

Description

technical field [0001] The invention relates to a catalyst, especially a catalyst composition for removing nitrogen oxides in flue gas, especially a foam-type flue gas denitrification catalyst with wide temperature working range. Background technique [0002] NO emitted into the atmosphere by human activities X Among them, more than 90% are produced in the combustion process of various fuels. NO X Although there are many kinds, the main one discharged from the combustion system is NO 1 and NO 2 . Selective Catalytic Reduction (SCR) technology is currently the most widely used denitrification technology in industry (3P143). It was first proposed and patented by the American Eegelhard Company in 1950, and it was formally studied in Japan in 1972. and developed and industrialized in 1978. It is also the flue gas denitrification technology mainly used in my country at present, and its main reactions are as follows: [0003] 4NH3+4NO+O2→4N2+6H2O (1) [0004] 8NH3+6NO+O2→7...

AI Technical Summary

Problems solved by technology

[0007] At present, the denitrification catalysts used in China are usually high-temperature catalysts, and the types of catalyst products are generally flat or honeycomb, which require the temperature of the gas to pass through the catalyst to be higher than 180 degrees, or even higher than 200 degrees, and to be discharged from the boiler The gas temperature usually does not reach such a temperature, so the existing catalyst often requires additional heating of the gas when it is installed on-line, which will introduce additional energy waste; or the engineering structure of the existing boiler needs to be modified so that the denitrification catalyst When installing, try to be as close to the exhaust port as possible, which will add great difficulty to the construction of environmental protection projects and increase the cost of the project