Why electrocatalytic oxidation can degrade organic matter

Principle of Electrocatalytic Oxidation for Degradation of Organic Matter] Electrocatalytic oxidation is a form of advanced oxidation. The most significant feature of the advanced oxidation method is to produce hydroxyl radical (·ho) intermediates in the oxidation system in a certain way, and react with organic matter with (·ho) as the main oxidant, and at the same time, organic free radicals can be generated or organic peroxide free radicals can be generated in the reaction to continue the reaction, so as to achieve the purpose of complete decomposition or partial decomposition of organic matter.

Electrocatalytic oxidation technology is an oxidation reaction that uses electricity as a catalyst and hydrogen peroxide, oxygen, ozone, etc. as oxidants. Electrocatalytic oxidation is a form of advanced oxidation. Compared with the direct oxidation of ozone, the reaction rate of hydroxyl radicals (·ho) generated in the electrocatalytic oxidation system is 105 times higher, there is no selectivity, and almost all organic matter can be reacted, so the effect of advanced oxidation is stable and will not change with the change of residual organic matter in water.

Electrocatalytic oxidation can degrade organic matter thanks to the four major effects of the electrocatalytic oxidation process, which are as follows:

1.Oxidation. Direct oxidation of organic matter in wastewater.

2.Reductive effect. In addition to the direct reduction effect, the cathode plate can also be produced by H+ discharge[H], which can remove the color of the wastewater.

3.Air flotation. When wastewater is treated, gases such as N2 and CO2 are generated, which play a role in air flotation.

4.Flocculation. After electrolysis of wastewater, the anode is easy to form iron ions or aluminum ions, and after the reaction, iron and aluminum hydroxyl complexes are formed, which can remove impurities such as suspended solids or colloids in the wastewater and play a coagulation role;

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Catalytic oxidation can occur for alkanes and hydrocarbons containing inadvertent base-kale saturation bonds.

Catalytic oxidation refers to the oxidation reaction with metal materials as the broadening caller and air, oxygen, ozone and other oxidants under certain pressure and temperature conditions, including "oxygenation" and "dehydrogenation". Refers to the redox reaction of carbon atoms or other atoms in organic molecules. Oxidation and reduction in organic chemistry can be judged by the change of oxidation number, which increases as oxidation and decreases as reduction.

<> degradation and catalysis are different in terms of concept. Degradation refers to the process of breaking down a molecule into smaller molecules, which usually do not have the properties of the previous molecules. Catalysis, on the other hand, refers to promoting or accelerating the occurrence of a chemical reaction, so that the regression reactants are more susceptible to chemical reversal under different conditions, but the catalyst does not change the essential characteristics of the reactants and products.

Degradation is usually achieved by hydrolysis, oxidation, reduction, etc., and the reaction process requires the absorption of energy, so it usually requires higher temperatures and pressures. Catalytic reactions also require a specific catalyst acting on the reactants, accelerating the reaction through the reaction sites provided by the catalyst surface, and the reaction usually takes place at lower temperatures and noisy swimming pressures.

Catalytic combustion is a purification method that uses a catalyst to oxidize and decompose the flammable substances in the exhaust gas at a lower temperature. Therefore, catalytic combustion is also known as catalytic chemical conversion. Since the catalyst accelerates the process of oxidative decomposition, most hydrocarbons are large.

At a temperature of 300 450 °C, the oxidation can be completed by means of a catalyst.

Compared with the thermal combustion method, catalytic combustion requires less auxiliary fuel, low energy consumption, and small volume of equipment and facilities. However, due to the poisoning of the catalyst used, the replacement of the catalytic bed and the high cost of cleaning, the promotion and application of this method in the industrial production process have been affected.

in chemical reactions.

In the process, the method of using a catalyst to reduce the combustion temperature and accelerate the complete oxidation of toxic and harmful gases is called catalytic combustion. Since the catalyst carrier is made of porous material, it has a large specific surface area.

And the appropriate pore size, when the organic gas heated to 300 450 passes through the catalytic layer, the oxygen and organic gas are adsorbed on the catalyst on the surface of the porous material, which increases the chance of contact and collision between oxygen and organic gas, improves the activity, and makes the organic gas and oxygen produce a violent chemical reaction to generate CO2 and H2O, and at the same time generate heat, so that the organic gas becomes a non-toxic and harmless gas.

The catalytic combustion device is mainly composed of a heat exchanger, a combustion chamber, a catalytic reactor, a thermal system and an emission chimney for purifying the flue gas, as shown in the figure on the right. The purification principle is: before the unpurified gas enters the combustion chamber, it is preheated through the heat exchanger and sent to the combustion chamber, and the required reaction temperature is reached in the combustion chamber, and the oxidation reaction is carried out.

In the catalytic reactor, the purified flue gas releases part of the heat through the heat exchanger, and then discharges it into the atmosphere from the chimney.