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Prepn and application of catalyst for eliminating HCN-containing waste gas

A technology of catalyst and application method, which is applied in the field of HCN removal, can solve the problems of restricting the popularization and application of catalytic combustion method and high cost, and achieve the effects of reducing heat supply, convenient operation and energy saving

Inactive Publication Date: 2003-05-14
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 pure 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

[0018] H 2 PtCl 6 .6H 2 O dissolves in H 2 O, made into 0.05% aqueous solution, and then in Al 2 o 3 (16 mesh, specific surface area 280m 2 / g) Add an equal volume of chloroplatinic acid solution to the carrier, and soak for 12 hours at room temperature. After the prepared catalyst was dried at 150°C for 2 h, it was calcined at 450°C under air atmosphere for 4 h, and then at 150°C H 2 Reduction under the atmosphere for 2h. 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 (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 1.71ppm (detection method: TJ36-79, i.e. isonicotinic acid-pyrazolone colorimetric method); 3 14ppm (detection method: TJ36-79, Nessler's reagent spectrophotometry); tar 0.08vol% (detectio...

Embodiment 2

[0020] H 2 PtCl 6 .6H 2 O dissolves in H 2 In O, make a 1.00% aqueous solution, and then in Al 2 o 3 (10 mesh, specific surface area 250m 2 / g) Add an equal volume of chloroplatinic acid solution to the carrier, and soak for 12 hours at room temperature. After the prepared catalyst was dried at 140 °C for 1 h, it was calcined at 650 °C under air atmosphere for 1 h, and then at 150 °C H 2 Reduction under atmosphere for 3h. The prepared catalyst is installed in the reaction furnace, and then the temperature of the furnace is raised to 450 ° 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 1.78ppm; NH 3 58ppm; tar 0.03vol%. NOx was not detected. All the other are with embodiment 1.

Embodiment 3

[0022] H 2 PtCl 6 .6H 2 O dissolves in H 2 In O, make a 1.00% aqueous solution, and then in Al 2 o 3 (40 mesh, specific surface area 320m 2 / g) Add an equal volume of chloroplatinic acid solution to the carrier, and soak for 10 h at room temperature. After the prepared catalyst was dried at 100°C for 2 h, it was calcined at 500°C for 2 h in an air atmosphere, and then at 450°C H 2 Reduction under atmosphere for 0.5h. The prepared catalyst is installed in the reaction furnace, and then the temperature of the furnace is raised to 350 ° 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 81ppm; tar 0.15vol%. NOx was not detected. All the other are with embodiment 1.

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Abstract

The catalyst for eliminating HCN-containing waste gas is prepared via dissolving H2PtCl6.6H2O in H2O, impregnating Al2O3 carrier in H2PtCl.6H2O solution, drying calcinating and reduction. When it is used, the catalyst is loaded in reactor furnace, the temperature in the furnace is raised to 250-450 deg.c mixed gas contg. HCN, NH3, tar and air is introduced into the reactor furnace to eliminate waste gas via catalytic burning. The present invention has the advantages of simple preparation process, low cost and simple operation.

Description

[0001] Field: [0002] The invention belongs to a method for removing HCN, in particular to a method using Pt-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: [0003] 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. [0004] At present, there are four main methods for removing HCN: solution absorption method, adsorption method, direct combustion method and catalytic combustion method. The ...

Claims

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Application Information

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IPC IPC(8): B01D53/86B01J23/42B01J37/02
Inventor 凌立成张奉民李开喜吕春祥詹亮
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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