Method for preparing HCN hydrolysis catalyst

A technology for hydrolysis catalysts and absolute ethanol, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of expensive catalysts, complicated operation steps, increased operating costs, etc., and achieve low operating costs, The process is simple and the production cost is reduced

CN104190429AInactive Publication Date: 2014-12-10KUNMING UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2014-12-10
Estimated Expiration
Not applicable · inactive patent
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Abstract

The invention discloses a method for preparing an HCN hydrolysis catalyst, belonging to the field of control of gaseous pollutants. The catalyst is prepared by adopting a sol-gel method, elements such as Fe, Cu, Ni or Mn serving as hydrolytic active ingredients are loaded onto TiO2, and rare earth metals such as La and Ce are added, so that the hydrothermal stability of the catalyst is improved. The catalyst can be hydrolyzed to remove the HCN under the low-temperature and oxygen-free conditions and is finally converted into NH3 and CO, the toxicity of the HCN is greatly reduced, and the preparation method of the catalyst is simple in process and low in cost.
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Description

technical field

[0001] The invention relates to a high-efficiency catalyst for hydrolyzing and removing highly toxic gas HCN. Background technique

[0002] HCN is the first type A grade inorganic poisonous drug. HCN is mainly produced in typical industrial waste gases such as coke oven gas, yellow phosphorus tail gas, closed calcium carbide furnace tail gas and polyacrylonitrile-based carbon fiber (PANCF). The purification and recycling of exhaust gas also seriously affects the surrounding environment and human health, and has become a problem that must be paid attention to in my country's air pollution. After it enters the human body through the skin, respiratory tract or digestive tract, the rapidly decomposed free cyanide is easily combined with iron, copper, aluminum, etc. in various intracellular respiratory enzymes in the human body to prevent the reduction of metal ions and lead to the inactivation of the enzyme , so that cells can not use oxygen, resulting in intrace...

Examples

Embodiment 1

[0024] (1) Take 10 mL of butyl titanate, add 20 mL of absolute ethanol and 40 mL of glacial acetic acid to butyl titanate in sequence to make it evenly mixed, and stir vigorously at 60°C;

[0025] (2) Weigh 0.288g Fe(NO 3 ) 2 ·6H 2 O dissolved in 10mL water (Fe 2+ The concentration is 0.1 mol / L), then add 0.128g citric acid, stir to dissolve, Fe 2+ The molar ratio with citric acid is 1.5:1;

[0026] (3) Weigh out 0.0866g La(NO 3 ) 3 ·6H 2 O dissolved in 10mL water, La 3+ The concentration of is 0.02 mol / L;

[0027] (4) Mix the solutions obtained in step (2) and step (3) to obtain a mixed solution;

[0028] (5) Add the mixed solution of step (4) slowly to the solution of step (1) until a sol is formed;

[0029] (6) The obtained sol is allowed to stand and age for 1 week, then dehydrated and dried at 105°C for 10 hours, and calcined in a muffle furnace at 300°C for 6 hours to obtain a titanium-iron-lanthanum mixed oxide catalyst; Flake, grind, sieving to make 40-60 mesh particles for lat...

Embodiment 2

[0032] (1) Take 10 mL of butyl titanate, add 30 mL of absolute ethanol and 50 mL of glacial acetic acid to butyl titanate in sequence to make it evenly mixed, and stir vigorously at 60°C;

[0033] (2) Weigh 0.278g FeSO respectively 4 ·7H 2 O was dissolved in 10mL of water, then 0.0967g of citric acid was added, stirred to dissolve, where Fe 2+ The concentration is 0.1 mol / L, Fe 2+ The molar ratio with citric acid is 2:1;

[0034] (3) Weigh out 0.03g Ce 2 (SO 4 ) 3 ·4H 2 O is dissolved in 10mL water, Ce 3+ The concentration of is 0.015 mol / L;

[0035] (4) Mix the solutions obtained in step (2) and step (3) to obtain a mixed solution;

[0036] (5) Add the mixed solution of step (4) slowly to the solution of step (1) until a sol is formed;

[0037] (6) The obtained sol is allowed to stand and age for 2 weeks, then dehydrated and dried at 100°C for 12 hours, and calcined in a muffle furnace at 550°C for 4 hours to obtain a titanium-iron-cerium mixed oxide catalyst; Flake, grind, sieving to...

Embodiment 3

[0041] (1) Take 10 mL of butyl titanate, add 25 mL of absolute ethanol and 50 mL of glacial acetic acid to butyl titanate in sequence to make it evenly mixed, and stir vigorously at 65°C;

[0042] (2) Weigh 0.151g MnSO respectively 4 Dissolve in 10mL water, then add 0.096g citric acid, stir to dissolve, where Mn 2+ The concentration is 0.1mol / L, Mn 2+ The molar ratio with citric acid is 2:1;

[0043] (3) Weigh out 0.081g Ce 2 (SO 4 ) 3 ·4H 2 O is dissolved in 10mL water, Ce 3+ The concentration is 0.01 mol / L;

[0044] (4) Mix the solutions obtained in step (2) and step (3) to obtain a mixed solution;

[0045] (5) Add the mixed solution of step (4) slowly to the solution of step (1) until a sol is formed;

[0046] (6) The obtained sol is allowed to stand and age for 1 week, then dehydrated and dried at 110°C for 11 hours, and then calcined in a muffle furnace at 400°C for 5 hours to obtain a titanium-manganese-cerium mixed oxide catalyst; Flake, grind, sieving to make 40-60 mesh particl...