Low-temperature sulfur-resistant denitration catalyst and preparation method thereof

Abstract

The invention discloses a preparation method of a catalyst for removing NOx in coke oven tail gas through low-temperature sulfur-resistant catalytic reduction.The catalyst is prepared by taking titanium oxide as a carrier, taking one or two of cerium oxide, zirconia oxide and lanthanum oxide as an auxiliary, taking one or more than two of manganese oxide, cobalt oxide, copper oxide and ferric oxide as an active ingredient and adopting a precipitation-deposition method, wherein two or three of TiO2, ZrO2, CeO2, La2O2, MgO, CaO and BaO can be adopted as the carrier.In the low-temperature sulfur-resistant denitration catalyst, the loading quantity of the active ingredient is 5 wt%-20 wt%, and the loading quantity of the auxiliary is 0.5%-5%.According to the preparation method, the active ingredient prepared by achieving precipitation and deposition sodium carbonate and oxidizing and loading the active ingredient manganese dioxide through potassium permanganate is mainly distributed in the surface area of the carrier, and the dosage of the active ingredient can be effectively decreased.The catalyst is high in activity and sulfur poisoning resisting capacity and particularly suitable for catalytic removal of the NOx in the coke oven tail gas, and the denitration effect of the catalyst also can be expanded to the low-temperature denitration process of other tail gases.

Description

technical field [0001] The invention relates to a catalyst for catalyzing and eliminating nitrogen oxides in coke oven tail gas under low temperature conditions and a preparation method thereof. Background technique [0002] With the development of modern industry, environmental problems are becoming increasingly serious, especially NO x emissions have drawn widespread attention in recent years. my country NO x Mainly from industrial emissions, accounting for the national NO x More than 70% of the total emissions are mainly concentrated in the power, steel (including coking), and chemical industries. NO x It is one of the culprits that cause a series of air pollution such as smog, photochemical smog, and acid rain. x China's emission control focuses on industries such as coal-fired power plants and vehicle exhaust, while NOx emissions from the coking industry have not attracted enough attention. The "Coking Chemical Industry Pollutant Discharge Standard" (GB16717-2012)...

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Problems solved by technology

MnO prepared by sol-gel method x / TiO 2 Catalyst with high low-temperature denitrification activity, and the doping of Ce can increase the pore volume and specific surface area of ​​the catalyst, and at the same time can reduce the high activity window temperature of the catalyst and improve the activity of the catalyst. Due to the limitation of the use environment, it is currently suitable for coke ovens Oxide catalysts for tail gas denitrification have low sulfur resistance and short service life, so it is still the focus of researchers to develop denitrification catalysts with low temperature, high activity, high sulfur resistance and long life

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