Process of modifying the porosity of aluminosilicates and silicas, and mesoporous compositions derived therefrom
AssigneeThe Dow Chemical Company
InventorsDean M. Millar, Juan M. Garces
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Abstract
A process of modifying the porosity of an aluminosilicate or silica whose porosity is not amenable to modification by acid extraction. The process involves contacting said aluminosilicate or silica with an alkali aluminate, and then extracting the aluminate-treated material with an extraction agent so as to form the porosity-modified aluminosilicate or silica. The process is applicable to zeolites which are unreactive under acid extraction conditions, e.g. ferrierite, and applicable to zeolites which are structurally unstable under acid extraction conditions, such as the mineral bikitaite. Mesoporous compositions are disclosed, including a mesoporous ferrierite and a mesoporous zeolite DCM-3.
Claims23
A process of preparing a porosity-modified aluminosilicate or silica, the process comprising contacting an aluminosilicate or silica, whose porosity is not amenable to modification by acid extraction, with alkali aluminate under reaction conditions sufficient to prepare a porosity-modified aluminosilicate or silica precursor composition;
- and thereafter treating the porosity-modified aluminosilicate or silica precursor composition with an extraction agent under extraction conditions sufficient to prepare the porosity-modified aluminosilicate or silica.
A composition comprising a crystalline aluminosilicate in the lithium form having a mesopore volume no greater than 0.040 cc/g and having the X-ray diffraction pattern substantially shown in Table 1 hereinafter:
- TABLE 1 ______________________________________ 2.THETA. d (A) 100xI/Imax ______________________________________ 11.2 7.9 10 13.2 6.7 18 20.9 4.2 88 22.5 3.9 8 23.9 3.7 18 26.6 3.4 100 27.3 3.3 43 28.7 3.1 13 30.7 2.9 8 32.8 2.8 7 35.6 2.5 43 37.7 2.4 8 44.9 2.0 8 46.7 1.94 10 47.7 1.90 8 49.2 1.85 10 50.0 1.81 10. ______________________________________
A composition comprising an aluminosilicate having a mesopore volume, as measured by nitrogen absorption, greater than 0.060 cc/g and having an X-ray diffraction pattern substantially as shown in Table 1:
- TABLE1 ______________________________________ 2.THETA. d (A) 100xI/Imax ______________________________________ 11.2 7.9 10 13.2 6.7 18 20.9 4.2 88 22.5 3.9 8 23.9 3.7 18 26.6 3.4 100 27.3 3.3 43 28.7 3.1 13 30.7 2.9 8 32.8 2.8 7 35.6 2.5 43 37.7 2.4 8 44.9 2.0 8 46.7 1.94 10 47.7 1.90 8 49.2 1.85 10 50.0 1.81 10. ______________________________________
A composition comprising a ferrierite zeolite having a ratio of mesopore volume to combined micropore and mesopore volumes, as measured by nitrogen absorption, in the range from 0.25 to less than 1.00.
Dependencies are inferred from the claim text.