Method for preparing HCN hydrolysis catalyst

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.

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...

AI Technical Summary

Problems solved by technology

But these two kinds of catalysts all use expensive metals such as platinum and rhodium as active components, and the catalyst cost is relatively high.

At the same time, the catalytic oxidation reaction needs to be operated at a high temperature of 300-550°C, and the energy consumption is high, so the cost of removing HCN by this method is relatively high

[0005] The shortcomings of the above catalysts mainly include: (1) The catalyst is expensive, the operation steps are complicated, and the operation cost is high; (2) The removal rate is relatively low, and it cannot be completely removed Removal of pollution; (3) High reaction temperature, high energy consumption, and increased operating costs

[0006] At the same time, the general HCN purification method often requires a higher oxygen content, but yellow phosphorus tail gas, closed calcium carbide furnace tail gas, graphite production tail gas, water gas, The main components of several gases such as biomass pyrolysis gas are CO, H2, CH4 or their mixed gas, because CO, H2 sub>, CH4 or their mixtures are explosive. When the oxygen content exceeds a certain amount, there is a huge safety hazard. The oxygen content in these types of gases is very low, less than 0.5%. Therefore, It is necessary to develop low-temperature micro-oxygen catalysts for purifying HCN