Microporous crystalline aluminosilicate designated DCM-2
AssigneeThe Dow Chemical Company
InventorsDean M. Millar, Gregg E. Lewis, Juan M. Garces
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Abstract
A novel microporous crystalline aluminosilicate designated DCM-2 is disclosed. The composition, as synthesized, contains lithium cations and is represented by the oxide composition: Li.sub.2 O.multidot.Al.sub.2 O.sub.3 .multidot.10SiO.sub.2. The lithium cations may be exchanged with hydrogen ions, and in the acid form the composition is useful as an adsorbent and as a catalyst for converting alkyl halides and alkanols to light hydrocarbons.
Claims7
A synthetic crystalline aluminosilicate having an x-ray diffraction pattern which includes the following reflections:
- ______________________________________ 2.THETA. d (.ANG.) 100 .times. I/I.sub.max ______________________________________ 9.1 9.6 19 9.4 9.3 86 10.5 8.4 75 13.2 6.6 12 16.7 5.2 21 18.4 4.8 45 19.0 4.6 28 19.5 4.5 10 21.1 4.1 39 21.7 4.0 46 23.5 3.7 68 24.9 3.5 100 25.7 3.4 57 27.0 3.3 40 29.0 3.0 37 30.1 2.9 91. ______________________________________
A process of preparing a crystalline aluminosilicate having an x-ray diffraction pattern which includes the following reflections:
- ______________________________________ 2.THETA. d (.ANG.) 100 .times. I/I.sub.max ______________________________________ 9.1 9.6 19 9.4 9.3 86 10.5 8.4 75 13.2 6.6 12 16.7 5.2 21 18.4 4.8 45 19.0 4.6 28 19.5 4.5 10 21.1 4.1 39 21.7 4.0 46 23.5 3.7 68 24.9 3.5 100 25.7 3.4 57 27.0 3.3 40 29.0 3.0 37 30.1 2.9 91 ______________________________________
- the process comprising preparing a reactive gel comprising:
- (a) a source of silica which is essentially free of Group IIA metal ions and Group IA metal ions with the exception of lithium,
- (b) a source of alumina which is essentially free of Group IIA metal ions and Group IA metal ions with the exception of lithium, the silica to alumina molar ratio ranging from about 5 to about 30,
- (c) lithium carbonate in an amount such that the Li/Si atomic ratio is in the range from about 0.40 to about 1.25, and
- (d) water in an amount such that the molar ratio of H.sub.2 O/SiO.sub.2 ranges from about 9 to about 50,
- and thereafter heating the reactive gel at a temperature between about 190.degree. C. and about 250.degree. C. for a time sufficient to produce the crystalline aluminosilicate.
Dependencies are inferred from the claim text.