| 摘要 |
1286992 Zeolite catalysts UNION CARBIDE CORP 17 Oct 1969 [23 Oct 1968] 51056/69 Heading C1A [Also in Division C5] A three-dimensional zeolitic molecular sieve having a pore size large enough to adsorb benzene and having in its dehydrated state the general formula where x has a value of from 2 to 20; M is a monovalent or a bivalent metal cation or mix- ture of such cations, with the proviso that at least 20 equivalent per cent of said cations are alkali metal cations; n is the valence of M, said zeolite containing not more than 3 surface hydroxy groups per 100 framework aluminium atoms, preferably less than 1 surface hydroxy group per 100 aluminium atoms, which surface hydroxyl exhibits infrared absorption in the region of 3500 to 3700 cm.<SP>-1</SP>. The value of x is preferably from 3 to 15. The metal cation M is preferably monovalent with an ionic radius of at least 1À10 Š. The said zeolite may be used as a catalyst for the preparation of olefins by the catalytic conversion of saturated hydrocarbons (see Division C5).
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