Zibo XiangRun Environment Engineering Co., Ltd.Gamma alumina is nano alumina xz-L290, white fluffy powder state. The crystal type is γ -Al2O3. The particle size is 20nm; the specific surface area is larger than 230m2/g. Nanometer alumina xz-L290 owns size distribution uniform, high purity and excellent dispersion and high specific surface, with resistance to high temperature and inert, high activity. porous, so it is a kind of activated alumina. It is high hardness, dimensional stability good, widely used in all kinds of plastics, rubber, ceramics, refractories and other products.
Alumina carrier refers to the white powder or alumina solid , which is a kind of most widely used catalyst carrier and about 70% catalyst in industry. Alumina has a variety of forms. Not only different forms have different properties, but also the same forms due to different sources and have different properties, such as density, pore structure, specific surface area, etc.
These properties for alumina used as catalyst carrier has an important significance.Alumina is mostly from the hydroxide (also called hydration alumina or alumina hydrate) preparation.
Application of alumina catalyst:
(1) load catalytic active component.
Small specific surface area of the alumina (or only a small amount of coarse material), usually used for load than high activity catalyst active component.With this kind of carrier can eliminate pore diffusion effect, in the selective oxidation process, for the purpose of can reduce the depth of oxidation reaction.Such as ethylene oxidation to ethylene oxide with silver catalyst for alpha alumina carrier.A large specific surface area of alumina has developed pore structure, make the load of catalyst active component , highly disperse particles, and with the aid of barrier for carrier, and prevent the active component particles grew up in the process of using sintering, which is a kind of widely used alumina carrier.Such as precious metals, platinum, palladium, rhodium, and dispersed in alumina carrier made hydrogenation catalyst, can improve the utilization rate of precious metals.
(2) the surface acidity of alumina and the load of active component bifunctional catalysts.
Using platinum - alumina catalyst, such as platinum reforming of both of alumina as the carrier, is also one of catalyst active component.In some cases, alumina carrier with high dispersion of metal (such as platinum) has a strong interaction between, can affect the catalytic properties of the metal.
