Bifunctional catalyst, and preparation method and applications thereof

Abstract

The invention provides a bifunctional catalyst, and a preparation method and applications thereof. The preparation method comprises following steps: a silicon source and an aluminium source are dissolved in an alkaline aqueous solution so as to obtain a solution A, and the solution A is mixed with an aqueous solution of a multi-metal organic amine complex so as to obtain a suspending liquid; the suspending liquid is subjected to dispersion fully, hydro-thermal reaction is carried out, and an obtained reaction product is subjected to washing, drying, and roasting so as to obtain the bifunctional catalyst. The multi-metal organic amine complex is a complex prepared from a metal inorganic salt with a complexing agent; the metal inorganic salt is a mixture of more than two ingredients selected from an inorganic salt of copper, an inorganic salt of manganese, an inorganic salt of nickel, an inorganic salt of iron, and an inorganic salt of iron. The bifunctional catalyst is excellent in denitration effect, and possesses excellent NH3-SCO activity (is capable of reducing NH3 penetrating effectively) at the same time.

Description

technical field [0001] The invention relates to a bifunctional catalyst and its preparation method and application, in particular to a denitrification NH 3 -SCR (selective catalytic reduction, selective catalytic reduction) and subsequent NH 3 -SCO (selectivecatalytic oxidation, selective catalytic oxidation) process coupled bifunctional catalyst and its preparation method and application, belonging to the field of denitrification catalysts. Background technique [0002] With the continuous growth of energy consumption, stationary sources such as coking furnaces, steel sintering machines, coal-fired boilers, etc., and mobile sources such as internal combustion engines of motor vehicles emit nitrogen oxides (NOx) into the atmosphere. x ) is getting larger and larger. Nitrogen oxides (NO x ) is one of the main pollution in the atmospheric environment. It can form photochemical smog, produce acid rain, acid fog, and destroy the ozone layer. It is harmful to the environment a...

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Problems solved by technology

At present, although the low-nitrogen transformation of the combustion furnace and the post-installation of NH 3 -SCR technology can meet the emission control requirements of low-concentration flue gas, but the utilization rate of some electric boilers is too low, less than 5000h / a, and it must be ultra-low at all times. It is impossible to adjust the ammonia injection amount flexibly when the boiler load fluctuates, so the power plant Most of the ammonia is injected excessively, and a lot of ammonia escapes into the atmosphere. In addition, there are many boiler flue gases with high concentrations and high emission values ​​(especially in the metallurgical and iron and steel industry). It is difficult to meet higher emission standards, but increasing the amount of ammonia gas injection will cause secondary pollution of ammonia gas penetration

This technology specially prepared a kind of NH removal for the back of SCR 3 Although the catalyst has an excellent detachment effect, it is still aimed at the flue gas of power plants, which is relatively NO x low content of flue gas, and the catalyst is only a single-function NH 3 -SCO catalysts still need to install SCR catalysts in front of SCO catalysts, which leads to increased equipment investment and operating costs, which is not conducive to popularization and application

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