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Catalyst with Cu being loaded for taking off waste gas containing HCN and its preparing method as well as application

A catalyst and application method technology, applied in the field of HCN removal, can solve the problems of limiting the popularization and application of catalytic combustion method, high cost, etc., and achieve the effects of reduced production cost, convenient operation and energy saving

Inactive Publication Date: 2005-06-01
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the catalysts used for catalytic combustion are mainly noble metal catalysts such as Pt, Rh, and Pd, and their high cost limits the further application of catalytic combustion in industry.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Cu(NO 3 ) 2 ·3H 2 O dissolves in H 2 In O, make a 4wt% aqueous solution, and then in Al 2 o 3 (16 mesh, specific surface area 80m 2 / g) an equal volume of Cu(NO 3 ) 2 solution, soaked at room temperature for 12h. After the prepared catalyst was dried at 150°C for 5 h, it was calcined at 450°C in air atmosphere for 4 h, and then at 550°C H 2 Reduction under the atmosphere for 5h, the weight ratio Cu:Al 2 o 3 = 3.95:100 catalyst. The prepared catalyst is installed in the reaction furnace, and then the temperature of the furnace is raised to 150° C., and the catalyst containing HCN (10 ppm), NH 3 (50ppm), tar (1vol%), air (5vol%) and N 2 (As a balance gas) and other mixed gas, the air velocity of the mixed gas is 10000 / h. Detect the outlet concentration of gas at the reactor outlet: HCN is 1.68ppm (detection method: TJ36-79, i.e. isonicotinic acid-pyrazolone colorimetric method); 3 16ppm (detection method: TJ36-79, Nessler's reagent spectrophotometry); tar 0....

Embodiment 2

[0021] Cu(NO 3 ) 2 ·3H 2 O dissolves in H 2 In O, make a 6.00w% aqueous solution, and then in Al 2 o 3 (10 mesh, specific surface area 250m 2 / g) an equal volume of Cu(NO 3 ) 2 solution, soaked at room temperature for 12h. After the prepared catalyst was dried at 140°C for 1 h, it was calcined at 650°C for 1 h in an air atmosphere, and then at 300°C H 2 Reduction under the atmosphere for 8h, the weight ratio Cu:Al 2 o 3 =5.92:100 catalyst. The prepared catalyst is installed in the reaction furnace, and then the temperature of the furnace is raised to 300 °C, and the catalyst containing HCN (10vol%), NH 3 (10vol%), tar (1vol%), air (50vol%) and N 2 (As balance gas) and other mixed gas, the air velocity of the mixed gas is 20000 / h. Detect the outlet concentration of gas at the outlet of the reactor: HCN is 1.76ppm; NH 3 54ppm; tar 0.03vol%. NOx was not detected. All the other are with embodiment 1.

Embodiment 3

[0023] Cu(NO 3 ) 2 ·3H 2 O dissolves in H 2 In O, make a 5.00wt% aqueous solution, and then in Al 2 o 3 (40 mesh, specific surface area 162m 2 / g) an equal volume of Cu(NO 3 ) 2 solution, soaked at room temperature for 10h. After the prepared catalyst was dried at 100°C for 6 h, it was calcined at 500°C for 2 h in an air atmosphere, and then at 300°C H 2 Reduction under the atmosphere for 8h, the weight ratio Cu:Al 2 o 3 = 4.94:100 catalyst. The prepared catalyst is installed in the reaction furnace, and then the temperature of the furnace is raised to 250 ° C, and the catalyst containing HCN (1vol%), NH 3 (20vol%), tar (5vol vol%), air (40vol%) and N 2 (As a balance gas) and other mixed gas, the air velocity of the mixed gas is 10000 / h. Detect the outlet concentration of the gas at the outlet of the reactor: HCN is 1.65ppm; NH 3 83ppm; tar 0.17vol%. NOx was not detected. All the other are with embodiment 1.

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Abstract

The weight ratio composition of a supported Cu catalyst for removing HCN-containing exhaust gas is Cu:Al 2 o 3 =2.96~5.92:100. Its preparation method is in Al 2 o 3 An equal volume of Cu(NO 3 ) 2 solution, impregnated, dried, roasted, H 2 Reduction, the catalyst was prepared. The prepared catalyst is installed in a reaction furnace, and then the temperature of the furnace is raised to 150-300°C. Will contain HCN, NH 3 The mixed gas of , tar and air is passed into the reaction furnace, and the exhaust gas is removed by catalytic combustion. The invention has the advantages of simple preparation method, low cost and convenient operation.

Description

Technical field: [0001] The invention belongs to a method for removing HCN, in particular to a method using Cu-Al 2 o 3 It is used as a catalyst to remove the HCN-containing waste gas produced in the carbon fiber production process through catalytic oxidation. Background technique: [0002] In the production process of polyacrylonitrile-based carbon fiber, highly toxic gas HCN and harmful gas NH are inevitably produced 3 If the waste gas such as tar and tar is discharged directly without treatment, it will inevitably cause serious environmental pollution, and even endanger the survival of animals and plants. It can cause poisoning within hours. Therefore, it is of great significance to study the removal of HCN for the development of carbon fiber industry and the protection of ecological environment. [0003] At present, there are four main methods for removing HCN: solution absorption method, adsorption method, direct combustion method and catalytic combustion method. T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/56B01D53/86B01J23/72B01J23/835
Inventor 凌立成张奉民李开喜吕春祥
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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