Catalyst for catalytic combustion of VOCs as well as preparation method and application thereof

Abstract

The invention provides a catalyst for catalytic combustion of VOCs and a preparation method and application thereof, and belongs to the field of catalyst preparation. The invention particularly provides a core-shell type catalyst which is formed by covering, with a SiO2 shell, a catalyst taking a sulfuric acid modified TiO2-CeO2 composite oxide as a carrier and loaded with noble metal ruthenium oxide and / or transition metal vanadium oxide as active components. The CeO2 has good oxygen mobility and can significantly enhance the oxidation-reduction performance of the catalyst, so that the catalyst has efficient VOC catalytic oxidation activity; the carrier is soaked in sulfuric acid; the surface acidity is enhanced to inhibit adsorption of acidic impurity components such as SO2, HCl and H2S,the active components RuO2 and V2O5 also have sulfur resistance, so that the sulfur poisoning resistance of the catalyst is remarkably improved, the silicon shell can inhibit contact between chlorideand the active components, and inactivation of the active components of the catalyst due to chlorine poisoning is avoided; or honeycomb ceramic can be used as a matrix to prepare a coated type catalyst.

Description

technical field [0001] The invention relates to the technical field of catalyst preparation, in particular to a VOCs catalytic combustion catalyst and its preparation method and application. Background technique [0002] In recent years, due to different raw materials and processes, various volatile organic waste gases (VOCs) from many industries have been discharged, which have the characteristics of large emissions, strong toxicity, easy volatilization, wide range, and difficulty in prevention and control. It can form photochemical smog and cause serious pollution to the environment. Therefore, the development of air pollution control technology has become the focus of current scientific research. At present, there are many treatment methods for VOCs. Among them, the catalytic combustion method is more efficient, energy-saving, and environmentally friendly. At a lower operating temperature (200-400°C), it can achieve complete oxidation of VOCs without secondary pollution....

AI Technical Summary

Problems solved by technology

At present, the catalytic combustion of conventional VOCs is relatively mature, but SO 2 、H 2 Acid gases such as S and HCl can easily cause poisoning and deactivation of conventional commercial catalytic combustion catalysts during catalytic combustion of VOCs

For example, the honeycomb ceramic carrier catalyst provided by Chinese patent CN 108043473 A has excellent stability and catalytic conversion activity in the catalytic combustion of VOCs in exhaust gas without acid gas, and a kind of sulfur-resistant VOCs low-temperature catalytic combustion provided by Chinese patent CN 108043398 A Catalysts have the advantages of good sulfur resistance and high temperature shock resistance, but they cannot contain SO at the same time 2 、H 2 It has a good catalytic effect under the atmosphere of S and HCl, and the treatment effects of condensation and solvent washing are limited, so it is urgent to develop a method for 2 , HCl, H 2 Stable and efficient catalytic combustion catalyst for unconventional VOCs exhaust gas with acidic impurity components such as S

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