A kind of nitrogen oxide and mercury synergistic oxidation catalyst and preparation method thereof

Abstract

The invention discloses nitrogen oxide and mercury co-oxidation catalyst and a preparation method thereof. The catalyst is as shown in the formula: SnaCobGecCudOx, wherein a, b, c, d and x represent the atomic numbers of Sn, Co, Ge, Cu and O respectively; a:b:c:d=(0.40 to 0.65):(0.05 to 0.23):(0.05 to 0.10):(0.50 to 0.02); x depends on the valences of the metallic elements. The preparation method comprises the following steps: (1) adding water into Sn salt, Co salt and meta-germanate, so as to obtain a water solution I; adding ethanol into Cu salt to obtain an alcoholic solution; mixing the water solution I and the alcoholic solution; (2) under an oxygen-free atmosphere, adding an alkaline water solution into the mixed solution obtained in the step (1), stirring to obtain a water solution II; carrying out centrifugation to remove supernate, and carrying out washing and drying; (3) soaking power obtained in the step (2) into an alkaline alcoholic solution, and drying; carrying out calcinations to obtain the catalyst. The catalyst can catalyze NO and Hg<0> in a concerted manner at 200 to 350 DEG C, is high in catalyzing efficiency, and has favorable H2O poisoning and NH3 interference preventing performance.

Description

technical field [0001] The invention relates to a catalyst and a preparation method thereof, in particular to a metal oxide catalyst and a preparation method thereof. Background technique [0002] Nitrogen oxides (NO x ) and mercury (Hg) are important air pollutants in my country. With the rapid development of my country's economy, the consumption of coal-based energy has grown rapidly, and the consumption of a large amount of fossil fuels has led to the emission of NO into the atmosphere. x and Hg emissions increased rapidly. They not only cause environmental problems such as acid rain and photochemical smog, but also have great harm to human health. Therefore, how to effectively control NO x And Hg emissions have become a very important issue in the development of our national economy. [0003] At present, ammonia selective catalytic reduction technology (NH 3 -SCR) is the most widely used NO in industry x Control technology, which has a long history of application ...

AI Technical Summary

Problems solved by technology

However, there are still some problems in the actual use of this type of catalyst: first, the relatively high content of water vapor (H 2 O) and sulfur dioxide (SO 2 ) has a great impact on catalyst activity and life; secondly, the catalyst active component V 2 o 5 The precursor of the catalyst is very toxic, and it is easy to pollute the human body and the ecological environment; thirdly, the catalyst system has a narrow applicable temperature range, and it is difficult to apply to industrial boilers / furnaces with low flue gas discharge temperature (<250°C)

However, there is a problem that the NH injected during the SCR denitrification process 3 Severely inhibit the oxidation of HgO, affecting the popularization and application of this technology

It has been reported that cobalt oxide has good NO oxidation reaction activity, but its resistance to water vapor poisoning is poor

Cobalt oxide has less research on the oxidation of HgO, and no anti-NH 3 Report on Cobalt Oxide Catalyst Interfering with Efficient Mercury Oxidation and Synergistic NO Oxidation

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