VOCs precious metal honeycomb catalyst

VOCs precious metal honeycomb catalystIt is a precious metal material that can change the rate of chemical reactions without itself participating in the reaction products. Almost all precious metals can be used as catalysts, but commonly used ones are platinum, palladium, rhodium, silver, ruthenium, etc. Among them, platinum and rhodium are particularly widely used. Their electronic orbitals are not fully filled, and the surface is prone to adsorb reactants with moderate strength, which is conducive to the formation of intermediate 'active compounds' and has high catalytic activity. At the same time, they also have comprehensive excellent characteristics such as high temperature resistance, oxidation resistance, and corrosion resistance, making them important catalyst materials. It is highly valued for its excellent activity, selectivity, and stability, and is widely used in reactions such as hydrogenation, dehydrogenation, oxidation, reduction, isomerization, aromatization, cracking, synthesis, etc. It plays a very important role in the fields of chemical engineering, petroleum refining, petrochemicals, pharmaceuticals, environmental protection, and new energy.

VOCs precious metal honeycomb catalystCatalyst deactivation refers to the phenomenon in which catalysts lose their activity due to various factors during use. The reasons for deactivation of precious metal catalysts are generally divided into three categories: poisoning, sintering and thermal deactivation, coking, and blockage.

According to the type of catalytic reaction, it can be divided into two categories: homogeneous catalysis and heterogeneous catalysis. Catalysts for homogeneous catalysis are usually soluble compounds (salts or complexes), such as palladium chloride, rhodium chloride, palladium acetate, rhodium carbonyl, triphenylphosphine carbonyl rhodium, etc. The catalyst used in multiphase catalysis is an insoluble solid, mainly in the form of metal wire mesh and metal supported on porous inorganic carriers. The application range and dosage of metal wire mesh catalysts (such as platinum mesh and silver mesh) are limited. The vast majority of heterogeneous catalysts are supported on noble metals such as Pt/A12O3, Pd/C, Ag/Al2O3, Rh/SiO2, Pt Pd/Al2O3, Pt Rh/Al2O3, etc.

Plate catalysts use a metal mesh made of stainless steel metal plates as the substrate, and a mixture of TiO2, V2O5, etc. is adhered to the stainless steel mesh. After compression and calcination, the catalyst plates are assembled into catalyst modules.

Honeycomb catalysts are generally homogeneous catalysts. A mixture of TiO2, V2O5, WO3, and other materials is extruded through a ceramic extrusion device to produce catalyst elements with a cross-sectional area of 150mm x 150mm and varying lengths. These elements are then assembled into standard modules with a cross-sectional area of approximately 2m x 1m.

The manufacturing process of corrugated plate catalysts generally uses TiO2 reinforced with glass fibers as the substrate, and impregnates active components such as WO3 and V2O5 onto the surface of the catalyst to improve catalyst activity and reduce SO2 oxidation rate.

The selected active component is a vanadium free catalyst, which will not cause secondary pollution to the environment.

The catalyst exhibits good sulfur and water resistance, stable operation, and reliable catalyst life, making the flue gas purification process more reasonable. At the same time, energy consumption, operating costs, and one-time investment are significantly reduced.