摘要:
The invention relates to the use of a compound of the formula KmgF3 to trap metals in the form of fluorides and/or of oxyfluorides in a gaseous or liquid phase. It also relates to a compound of the formula KMgF3 which has a surface area at least equal to 30 m2/g and at most equal to 150 m2/g and also to its methods of preparation. The invention notably finds application in the nuclear industry, in which it can advantageously be used to purify uranium hexafluoride (UF6) present in a gaseous or liquid stream, with regard to metal impurities which are also present in this stream.
摘要:
The invention relates to the use of a compound of formula KMgF3 to trap metals present in the form of fluorides and/or of oxyfluorides in a gaseous or liquid phase.It also relates to a compound of formula KMgF3 which has a surface specific area at least equal to 30 m2/g and at most equal to 150 m2/g and also to its methods of preparation.The invention notably finds application in the nuclear industry, in which it can advantageously be used to purify uranium hexafluoride (UF6) present in a gaseous or liquid stream, with regard to metal impurities which are also present in this stream.
摘要:
The invention concerns a composition based on zirconium oxide and cerium oxide and, optionally, an oxide of another rare earth, characterized in that it contains tin oxide in a proportion of more than 25 wt. % of oxide. Said composition is obtained by a method which consists in forming a mixture comprising zirconium, cerium and tin compounds and, optionally a compound of another rare earth; in bringing said mixture in the presence of a basic compound whereby a precipitate is obtained; heating said precipitate in an aqueous medium and calcining same. The composition can be used as catalyst, in particular for treating motor vehicle exhaust gases.