Catalyst for selective catalytic reduction denitration and preparation method thereof

Abstract

The invention discloses a catalyst for selective catalytic reduction denitration and a preparation method thereof, and the preparation method comprises the following steps: weighing titanium dioxide, adding stearic acid and lactic acid, and uniformly performing stirring and mixing; adding ammonia water, deionized water, glass fiber and broad-leaved tree pulp into the mixed material, adding hot oxalic acid solution of ammonium metavanadate, ammonium paratungstate and ethanolamine into the mixed material, performing mixing, adding acetic acid solution of cerium carbonate and manganese carbonate, performing stirring and mixing, adding calcium silicate and barium sulfate, and adding a carboxymethyl cellulose aqueous solution, ethylene oxide and deionized water; adjusting the pH value of the solution by adopting ammonia water, and shaping, drying and calcining the mixed material after vacuum treatment to obtain the catalyst. The catalyst is reasonable in component, simple in process and controllable in cost, and by adding cerium oxide and manganese dioxide into the vanadium-titanium-tungsten-based denitration catalyst, the SO2 conversion rate of the vanadium-based catalyst is reduced, the use temperature range of the vanadium-based catalyst is widened, and the denitration efficiency of the catalyst under the low-temperature effect is improved.

Description

technical field [0001] The invention belongs to the technical field of coal-fired flue gas purification, and relates to a catalyst for selective catalytic reduction denitrification and a preparation method thereof. Background technique [0002] The most widely used flue gas denitrification technology in coal-fired power plants is selective catalytic reduction of ammonia (NH 3 -SCR) technology, under the action of vanadium titanium tungsten catalyst, NO and reducing agent NH 3 The following reaction occurs: [0003] 4NH 3 +4NO+O 2 →4N 2 +6H 2 o [0004] Because vanadium titanium tungsten catalyst has good catalytic activity, selectivity and sulfur resistance performance at 300-400 °C, it is widely used in the removal of nitrogen oxides in flue gas of coal-fired power plants. However, the vanadium titanium tungsten catalyst active component V 2 o 5 SO in the flue gas will be 2 converted to SO 3 , SO 3 and escape NH 3 Produces strongly adherent NH 4 HSO 4 , NH 4...

AI Technical Summary

Problems solved by technology

On the other hand, the active temperature range of the vanadium-titanium-tungsten catalyst is basically 300-400°C. When the temperature is further lowered, the NH 4 HSO 4 Enter the catalyst micropores to block the active sites, reducing the catalyst activity

With the expansion of the new energy scale, the flue gas temperature of the SCR denitrifica

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