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Effect of silicone oil on catalytic combustion

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Effect of silicone oil on catalytic combustion

Silicone oil is a kind of polyorganosiloxane with different polymerization degree chain structure, which is a kind of organic silicon product with a wide range of varieties and applications. They are classified according to the different substituents on the polysiloxane chain. Silicone oil can be divided into: methyl silicone oil, hydrogen containing silicone oil, vinyl silicone oil, polyether modified silicone oil, phenyl silicone oil, hydroxy silicone oil, fluorosilicone oil, amino silicone oil, ethyl silicone oil, and other types.

Due to the different substituent groups, there are many types of silicone oils that exhibit different boiling points and decomposition temperatures, such as boiling points, some over 100 degrees, and some over 300 degrees. The general decomposition temperature of silicone oil is above 300 ℃, and the maximum can reach 500 ℃. The product of decomposition of silicone oil at high temperatures is silicon dioxide (SiO2).

According to the above analysis, if silicone oil is contained in VOCs, even a small amount of silicone oil brought into the catalyst will theoretically have the following effects. If the boiling point of silicone oil is high and the decomposition temperature is high, it will directly adhere to the surface of the catalyst, leading to catalyst deactivation; If the boiling point of silicone oil is low, decomposition occurs at the catalytic temperature to produce silicon dioxide, which has a small impact on the catalyst. There are currently no research reports on whether VOCs catalysts can promote the decomposition of silicone oil.

If activated carbon adsorption concentration catalytic combustion technology is used, due to the high boiling point of silicone oil, it will be difficult to adsorb on the surface of activated carbon for desorption, so the impact on subsequent catalytic combustion is relatively small.

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