Low-temperature denitrification catalyst and preparation method thereof

Abstract

The invention discloses a low-temperature denitrification catalyst and a preparation method thereof. The catalyst takes titanium oxide as a carrier and ferric oxide as an active ingredient, and is doped with rare earth metal cerium, wherein the weight of ferric oxide accounts for 2-5% of that of titanium oxide, and the weight of rare earth metal cerium accounts for 0.5-1% of that of titanium oxide. The catalyst and the preparation method have the benefits that ferric oxide is added to the catalyst to serve as the active ingredient, so that the denitrification catalyst can exert the maximum catalytic activity within a temperature range of 200-400 DEG C; and in addition, cerium doping allows the activity of the catalyst to be improved greatly, can restrain generation of ammonium sulfate on the surface of the catalyst, and can improve the sulfur resistance of the catalyst.

Description

technical field [0001] The invention relates to a denitration catalyst, in particular to a low-temperature denitration catalyst and a preparation method thereof. Background technique [0002] Nitrogen oxides can produce photochemical smog, acid rain, ozone hole and greenhouse effect, and are one of the main pollutants in the atmosphere. The source of nitrogen oxides is mainly from the combustion of coal in transportation and thermal power generation. At present, flue gas denitrification is one of the effective methods to control the emission of nitrogen oxides in the process of coal combustion. Selective catalytic reduction (SCR) technology is due to its denitrification High efficiency, good selectivity, stable and reliable operation, etc., have been widely used in the flue gas denitrification process of coal-fired power plants. [0003] The core of SCR denitrification technology is the catalyst, and the research on catalytic materials has always been the research hotspot o...

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Problems solved by technology

[0003] The core of SCR denitrification technology is the catalyst, and the research on catalytic materials has always been the research hotspot of SCR technology. At present, the denitrification catalyst currently used in my country is mainly based on titanium vanadium (V 2 o 5 / TiO 2 ) and WO 3 or MoO 3 Although the vanadium-based catalyst has high denitrification activity and the ability to resist sulfur dioxide, it must be active at a very high temperature (300-400°C), so this high-temperature SCR denitrification device must be installed in the economizer After that, before the air preheater and desulfurization device, because the flue gas is passed into the desulfurization catalyst without dust removal treatment, it is very easy to cause the catalyst pores to be blocked and affect the service life. Realize denitrification, so the denitrification device can be installed after desulfurization, which not only reduces energy consumption, but also prevents catalyst pore clogging and improves catalyst life