| abstract |
Catalytic system for dehydrogenating ethylbenzene tonstyrene, containing chromium oxide, tin oxide, at leastnone oxide of an alkaline metal (M) and an aluminancarrier, in delta or theta phase or in a mixture ofndelta + theta or theta + alpha or delta + theta + alpha nphases, modified with silica, and characterized innthat:n the chromium, expressed as Cr 2 O 3 , is in a quantitynof between 6 and 30% by weight; the tin, expressed as SnO, is in a quantity ofnbetween 0.1 and 3.5% by weight; the alkaline metal, expressed as M 2 O, is in anquantity of between 0.4 and 3% by weight; the silica is in a quantity of between 0.08 and 3%nby weight, the complement to 100 being alumina. |