The adsorption of Alumina carrier of catalyst

The catalyst carrier, also known as the support, is one of the components of the supported catalyst. It is the skeleton of the active components of the catalyst, supports the active components, disperses the active components, and at the same time increases the strength of the catalyst. However, the carrier itself generally does not have catalytic activity.

This type of carrier is a porous material with a large specific surface area and is the most widely used type of carrier. The adsorbent carriers used to support TiO2 mainly include activated carbon, silica gel, porous molecular sieve, etc. The adsorbent-type carrier can obtain a large loading capacity, which can adsorb organic matter around the TiO2 particles, increase the interface concentration, and thus speed up the reaction speed. Cui Peng et al. carried out a photocatalytic degradation test of methyl orange aqueous solution by supporting activated carbon on a TiO2 film as a photocatalyst. The results show that compared with the degradation performance of commercial TiO2 micropowder photocatalyst, its degradation rate is higher. Due to the good adsorption performance of activated carbon in TiO2/C photocatalyst, an adsorption-reaction-separation system is generated in the photocatalytic reaction system. The integrated behavior increases the photocatalytic rate. Foreign studies by V.M.GuNk and others have shown that under different loadings, TiO2 does not form a continuous coating on the surface of silica gel; the forces between TiO2 and SiO2 include hydrogen bonds, electrostatic forces and a small amount of Si-O-Ti bonds, SiO2 The phase transition of TiO2 from anatase to rutile is suppressed. The domestic Zheng Guangtao et al. used the sol-gel method to load the modified high-efficiency TiO2 photocatalyst on spherical silica gel, and obtained a nano-TiO2 photocatalyst with mixed crystal structure, large specific surface area and high activity. The supported catalyst has strong absorption in the ultraviolet region, and the specific surface area reaches 379.8 m·g-1