Preparation method and application of hydrolyzed hydrogen cyanide catalyst

A catalyst and hydrogen cyanide technology, applied in chemical instruments and methods, separation methods, separation of dispersed particles, etc., to achieve high selectivity and purification efficiency

Inactive Publication Date: 2015-04-29
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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  • Preparation method and application of hydrolyzed hydrogen cyanide catalyst
  • Preparation method and application of hydrolyzed hydrogen cyanide catalyst
  • Preparation method and application of hydrolyzed hydrogen cyanide catalyst

Examples

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Embodiment 1

[0022] In this embodiment, the method for preparing a hydrogen cyanide hydrolysis catalyst using Cu-Zn-Al hydrotalcite as a precursor is as follows:

[0023] (1) Take 0.02mol Cu(NO 3 ) 2 ·6H 2 O, 0.1mol Zn(NO 3 ) 2 ·6H 2 O and 0.12mol Al(NO 3 ) 3 9H 2 O was dissolved in distilled water and configured as solution A, in which Cu 2+ and Zn 2+ The molar ratio of Cu, Zn and A is 0.2:1, and the molar ratio of Cu, Zn and A is 1:1; take 0.144mol NaOH and 0.06mol NaOH 2 CO 3 Dissolve in distilled water to make solution B 1 , so that where OH - with Cu 2+ , Zn 2+ and Al 3+ The molar ratio of the sum is 0.6:1, CO 3 2- with Al 3+ The molar ratio is 0.5:1.

[0024] (2) Drop the prepared solution A and solution B into a three-necked flask filled with an appropriate amount of water at the same time at a rate of 1 drop / second, so that the volume ratio of the sum of solutions A and B to the water in the three-necked flask is 0.5:1, while maintaining vigorous stirring, contr...

Embodiment 2

[0029] In this embodiment, the method for preparing a hydrogen cyanide hydrolysis catalyst using Cu-Zn-Al hydrotalcite as a precursor is as follows:

[0030] (1) Weigh 0.02mol Cu(NO 3 ) 2 ·6H 2 O, 0.01mol Zn(NO 3 ) 2 ·6H 2 O and 0.01mol Al(NO 3 ) 3 9H 2 O was dissolved in distilled water to prepare solution A, so that the molar ratio of Cu and Zn was 2:1, and the molar ratio of the sum of Cu, Zn and Al was 3:1; 0.08mol NaOH and 0.03mol NaOH were used 2 CO 3 Dissolve in distilled water to make solution B, where OH - with Cu 2+ , Zn 2+ and Al 3+ The molar ratio of the sum is 2:1, CO 3 2- with Al 3+ The molar ratio is 3:1.

[0031] (2) Drop the prepared solution A and solution B into a three-necked flask filled with an appropriate amount of water at the same time at a rate of 1 drop / second, so that the volume ratio of the sum of solutions A and B to the water in the three-necked flask is 2:1, while stirring vigorously, control the pH of the system to 11, and then...

Embodiment 3

[0036] In this embodiment, the method for preparing a hydrogen cyanide hydrolysis catalyst using Cu-Zn-Al hydrotalcite as a precursor is as follows:

[0037] (1) Weigh 0.02mol Cu(NO 3 ) 2 ·6H 2 O, 0.02mol Zn(NO 3 ) 2 ·6H 2 O and 0.02mol Al(NO 3 ) 3 9H 2 Dissolve O in distilled water and prepare solution A, so that the molar ratio of Cu and Zn is 1:1, and the molar ratio of the sum of Cu, Zn and Al is 2:1; take 0.078mol NaOH and 0.04mol NaOH 2 CO 3 Dissolve in distilled water to make solution B, where OH - with Cu 2+ , Zn 2+ and Al 3+ The molar ratio of the sum is 1.3:1, CO 3 2- with Al 3+ The molar ratio is 2:1.

[0038] (2) Drop the prepared solution A and solution B into a three-necked flask filled with an appropriate amount of water at the same time at a rate of 1 drop / second, so that the volume ratio of the sum of solutions A and B to the water in the three-necked flask is 1:1, while stirring vigorously, control the pH of the system to 9, and then crystall...

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Abstract

The invention discloses a preparation method and an application of a hydrolyzed hydrogen cyanide catalyst and belongs to the technical field of catalysts and preparation of the catalyst. The preparation method comprises the following steps: dissolving inorganic salt of Cu, Zn and Al in distilled water and dissolving NaOH and Na2CO3 in distilled water to prepare a solution B; then dropwise adding a solution A and the solution B at a rate of 1-2 drop/s into a three-mouth flask at the same time, and fiercely stirring, after adjusting the pH of the mixed liquid to 9-10, crystallizing and filtering and washing the filter residues by using distilled water till the washing liquid is neutral, and drying to obtain Cu-Zn-Al hydrotalcite as a precursor; and putting the Cu-Zn-Al hydrotalcite as the precursor into a muffle furnace, carrying out temperature programming to reach 300-500 DEG C from 30-50 DEG C and roasting for 3-5 hours at 300-500 DEG C to obtain the Cu-Zn-Al compound oxide hydrolyzed hydrogen cyanide catalyst. The catalyst prepared by the method disclosed by the invention has the advantages of strong selectivity, high catalytic activity, strong hydrothermal stability, simplicity and convenience in regeneration and the like and has good application value and prospect.

Description

technical field [0001] The invention relates to a preparation method and application of a catalyst for hydrolyzing hydrogen cyanide, and belongs to the technical field of catalysts and their preparation. Background technique [0002] HCN is a highly toxic substance and one of the most typical toxic and harmful pollutants in industrial waste gas. Many industrial waste gases contain more HCN, such as coke oven gas, yellow phosphorus tail gas, etc. The existence of hydrogen cyanide has caused great difficulties in the purification and reuse of waste gases. Catalytic hydrolysis of HCN has strong advantages for the purification and reuse of exhaust gas. At present, a lot of research has been done on the catalytic hydrolysis catalyst of hydrogen cyanide at home and abroad. For example, ZL99801094.4 discloses a method for catalytic removal of hydrogen cyanide. The mixed exhaust gas and steam are in contact with the alkalized chromium trioxide-alumina catalyst at a volume ratio of ...

Claims

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Application Information

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IPC IPC(8): B01J23/80B01D53/86B01D53/54
Inventor 田森林赵倩宁平张秋林张月超
Owner KUNMING UNIV OF SCI & TECH
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