The Difference Between Pseudo-boehmite And Boehmite
May 19, 2022
Aluminum hydroxide, also known as hydrated alumina, its chemical formula for Al2O3·NH2O. When n=1, Al2O3·H2O is called alumina monohydrate, which can be divided into three types: diaspore, boehmite and pseudo-boehmite. The main difference between boehmite and pseudo-boehmite is in grain size.
Alumina has a variety of crystal, under different conditions calcined alumina hydroxide preparation of alumina crystal morphology is different, among which γ -al2o3 is the most widely used in industry transition alumina, also known as activated alumina. γ -al2o3 has a large specific surface area, can be used as more metal or metal oxide carrier, its aperture size is adjustable, good thermal stability, often used as hydrogenation, reforming, methanol synthesis and other reactions catalyst carrier. At present, industrial activated alumina is mostly obtained by calcination of pseudo-boehmite, which is widely used in oil refining and automobile industry. In order to prepare alumina with large specific surface area and pore size, it is necessary to prepare the precursor of boehmite or pseudo-boehmite with large specific surface area. The morphology and particle size of pseudo-boehmite determine the morphology and specific surface area of alumina. At present, the preparation methods of pseudo-boealumite mainly include acid precipitation method, alkali precipitation method, aluminum alcohol method and sodium aluminate - carbon dioxide method.
