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

A SCR catalyst and low-temperature technology, which is applied in the field of catalytic chemistry, can solve the problems of catalyst efficiency decline, energy consumption, and catalyst life reduction, and achieve the effects of reducing drying procedures, reducing energy consumption, and improving service life

Active Publication Date: 2017-06-06
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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

Examples

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example 1

[0027] Dissolve 2g of oxalic acid in 50g of deionized water, stir and dissolve at 50°C, add 1g of ammonium metavanadate and continue to stir until it becomes a clear blue solution; mix 0.3g of triammonium phosphate and 1.5g of ammonium tungstate and 0.15g of ammonium bromide were sequentially added to the resulting solution, and continued to stir at 50°C until all dissolved until it became a black solution; 20g of TiO 2 The carrier was slowly added to the above solution, and stirred at 40°C until it became viscous; the obtained viscous solid was put into a muffle furnace without drying, and roasted at 250°C for 2 hours. Then it was calcined at 450° C. for 5 hours, cooled naturally to room temperature, sieved to 20-120 mesh for later use, and 1# catalyst was obtained.

example 2

[0029] Dissolve 4g of oxalic acid in 100g of deionized water, stir and dissolve at 50°C, add 2g of ammonium metavanadate and continue to stir until it becomes a clear blue solution; mix 0.6g of triammonium phosphate, 3g of ammonium tungstate and Add 0.3g of ammonium bromide to the resulting solution in sequence, continue to stir at 50°C, and dissolve all until it becomes a black solution; add 40g of TiO 2 The carrier was slowly added to the above solution, and stirred at 40°C until it became viscous; the obtained viscous solid was put into a muffle furnace without drying, and roasted at 250°C for 2 hours. Then it was calcined at 480°C for 5 hours, cooled naturally to room temperature, sieved to 20-120 mesh for later use, and 2# catalyst was obtained.

example 3

[0031] Dissolve 4g of oxalic acid in 100g of deionized water, stir and dissolve at 50°C, add 2g of ammonium metavanadate and continue to stir until it becomes a clear blue solution; mix 0.6g of triammonium phosphate, 3g of ammonium tungstate and Add 0.35g of ammonium bromide to the resulting solution in turn, continue to stir at 50°C, and dissolve all until it becomes a black solution; add 40g of TiO 2 The carrier was slowly added to the above solution, and stirred at 40°C until it became viscous; the obtained viscous solid was put into a muffle furnace without drying, and roasted at 250°C for 2 hours. Then it was calcined at 450° C. for 5 hours, cooled naturally to room temperature, sieved to 20-120 mesh for later use, and 3# catalyst was obtained.

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/16B01D53/90B01D53/56
Inventor 李坚梁全明何洪梁文俊宋芊千张铁军
Owner BEIJING UNIV OF TECH
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