| 摘要 |
The selective conversion of straight-chain hydrocarbons to straight-chain products is effected in the presence, as catalyst, of a crystalline aluminosilicate having a pore size of about 5A and a silicon to aluminium atomic ratio of at least 1.8 and the alumino-silicate being at least partially in the acidic form. Normal alkanes, e.g. hexane, may be cracked in the presence or absence of iso-alkanes or cyclics, propane, butane, butylene or pentane may be dehydrogenated, mono- and di-olefines may be hydrogenated and hydrocarbons may be hydrocracked. The catalyst may stilbite, offretite, chabazite, gmelinite, or analcite at least partially in the acid form obtained by base exchange with an acid or with an "onium" compound followed by decomposition. Preferably there is 0.5-1 equivalent of cation per gram atom of aluminium, and 0.01-90% of the cations may, if desired, be alkali metal. The catalyst may be incorporated with an organic or inorganic matrix which may contain a promoter and for hydrogenative reactions a catalyst such as platinum, molybdenum or molybdenum oxide may be incorporated. The examples describe the cracking of n-hexane. |
