Preparation formula and preparation method of a low-temperature sulfur-resistant SCR catalyst

Abstract

The invention provides a preparation recipe and a preparation method of a low-temperature anti-sulfur SCR (Selective Catalytic Reduction) catalyst for removing nitric oxides, belonging to the field of catalytic chemistry. A one-step dipping method is adopted to load V2O5, WO3, P2O5 and anion Br on the surface of anatase TiO2. The catalyst comprises the constituents with the following contents: 60 to 95 wt% of the TiO2, 0 to 10 wt% of the V2O5, 0 to 20 wt% of the WO3, 0 to 3 wt% of the P2O5 and 0.35 to 0.5 wt% of the Br. The precursors of the chemical constituents of the catalyst are respectively ammonium metavanadate as the precursor of the V2O5, ammonium tungstate as the precursor of the WO3, triammonium phosphate as the precursor of the P2O5 and ammonium bromide as the precursor of the Br. According to the preparation recipe, the trace non-metallic elements are loaded, sulfate generation in sulphur-containing flue gas by the catalyst is slowed down, the acid site of the catalyst is added, denitration efficiency and sulfur resistance of the catalyst are improved, and the service life of the catalyst under the low-temperature high-sulphur flue gas condition is prolonged; meanwhile, the preparation method of the catalyst is also improved, the one-step dipping method is adopted, a semifinished product drying process is reduced, the preparation time of the catalyst is shortened, and the industrialized production of the catalyst is facilitated.

Description

technical field [0001] The invention relates to a preparation formula and method of a low-temperature sulfur-resistant SCR catalyst, which can be used to remove nitrogen oxides in exhaust gases of gas boilers, glass kilns, cement kilns, etc., and belongs to the field of catalytic chemistry. Background technique [0002] As atmospheric environmental problems become increasingly prominent and people's demands for environmental protection continue to heat up, nitrogen oxides are one of the main pollutants in the atmosphere, and their control technology has attracted more and more attention. As a relatively mature and efficient flue gas denitrification technology, selective catalytic reduction technology has been widely used in industry and is the mainstream technology in the world's denitrification market. [0003] At present, the SCR catalysts on the market are mainly V 2 o 5 -MoO 3 -TiO 2 or V 2 o 5 -WO 3 -TiO 2 For medium-high temperature catalysts in the system, the...

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Problems solved by technology

[0003] At present, the SCR catalysts on the market are mainly V 2 o 5 -MoO 3 -TiO 2 or V 2 o 5 -WO 3 -TiO 2 For medium-high temperature catalysts in the system, the active temperature range is about 300-400°C, and the catalyst efficiency drops significantly at low temperatures; the exhaust gas temperature of many industrial kilns is lower than 220°C, and the sulfur dioxide content in the exhaust gas is high. If medium-high temperature denitrification is used, additional A heater is installed, which consumes a lot of energy; if low-temperature denitrification technology is used, SOx is easily combined with the reducing agent NH 3 Generate sulfate on the surface of the catalyst, block the catalyst pores, cover the active sites, and reduce the life of the catalyst

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