Patent ID: 6187280
Filing Date: 2001-02-13
Classification: B01J,C01F,C01P

Abstract:
A process for preparing aluminum fluoride having an essentially gamma crystalline structure, a surface area of at least 25 m.sup.2 /g, a pore volume higher than 0.20 cm.sup.3 /g as determined by mercury injection at high pressure, and a fluorine content of at least 95% by weight of the stoichiometric value of fluorine in aluminum fluoride, the process comprising fluorinating alumina with gaseous HF at a temperature higherthan 300.degree. to 400.degree. C., wherein the gaseous HF is diluted with an inert gas and has a partial pressure of between 0.1 and 0.5, and wherein the alumina has a surface area of at least 150 m.sup.2 /g and comprises from 1 to 10% by weight of silicon oxide.