Preparation recipe and preparation method of low-temperature anti-sulfur SCR (Selective Catalytic Reduction) catalyst

An SCR catalyst and catalyst technology, applied in the field of catalytic chemistry, can solve the problems of reducing the life of the catalyst, the efficiency of the catalyst, and energy consumption, and achieve the effects of increasing the service life, shortening the drying process, and reducing energy consumption.

Active Publication Date: 2015-08-19
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 con...

Method used

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  • Preparation recipe and preparation method of low-temperature anti-sulfur SCR (Selective Catalytic Reduction) catalyst
  • Preparation recipe and preparation method of low-temperature anti-sulfur SCR (Selective Catalytic Reduction) catalyst
  • Preparation recipe and preparation method of low-temperature anti-sulfur SCR (Selective Catalytic Reduction) catalyst

Examples

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example 1

[0027] Dissolve 2g of oxalic acid in 50g of deionized water and stir to dissolve at 50℃. Add 1g of ammonium metavanadate and continue to stir until it becomes a blue clear solution; 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℃, all dissolved until it became a black solution; add 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 placed in a muffle furnace without drying and calcined at 250°C for 2 hours. Then it is calcined at 450°C for 5 hours, naturally cooled to room temperature, and sieved to 20-120 meshes for use to obtain 1# catalyst.

example 2

[0029] Dissolve 4g of oxalic acid in 100g of deionized water and stir to dissolve at 50℃. Add 2g of ammonium metavanadate and continue to stir until it becomes a blue clear solution; add 0.6g of triammonium phosphate, 3g of ammonium tungstate and 0.3g of ammonium bromide was added to the resulting solution one by one, and stirring was continued at 50°C, all dissolved until it became a black solution; 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 placed in a muffle furnace without drying and calcined at 250°C for 2 hours. Then it is calcined at 480°C for 5 hours, naturally cooled to room temperature, and sieved to 20-120 meshes for later use to obtain 2# catalyst.

example 3

[0031] Dissolve 4g of oxalic acid in 100g of deionized water and stir to dissolve at 50℃. Add 2g of ammonium metavanadate and continue to stir until it becomes a blue clear solution; add 0.6g of triammonium phosphate, 3g of ammonium tungstate and 0.35g of ammonium bromide was added to the resulting solution in sequence, and stirring was continued at 50°C, all dissolved until it became a black solution; 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 placed in a muffle furnace without drying, and calcined at 250°C for 2 hours. Then it is calcined at 450°C for 5 hours, naturally cooled to room temperature, and sieved to 20-120 meshes for use to obtain 3# catalyst.

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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 anti-sulfur SCR catalyst, which can be used to remove nitrogen oxides in the tail gas of gas boilers, glass furnaces and cement furnaces, and belongs to the field of catalytic chemistry. Background technique [0002] As atmospheric environmental problems become more prominent and people’s demands for environmental protection continue to rise, nitrogen oxides, as one of the main pollutants in the atmosphere, their control technology has attracted more and more attention. Selective catalytic reduction technology, as a relatively mature and efficient flue gas denitration technology, has been widely used in industry and is the mainstream technology in the world's denitration market. [0003] SCR catalysts currently on the market are mainly V 2 O 5 -MoO 3 -TiO 2 Or V 2 O 5 -WO 3 -TiO 2 The medium and high temperature catalysts in the system have an active temperature range of about 300-...

Claims

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Application Information

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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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