Process for making a germanium-zeolite

Details Process for making a germanium-zeolite Process for making a germanium-zeolite

2006-04-18

2006-04-18

Sample, David (Department: 1755)

Chemistry of inorganic compounds

Zeolite

Organic compound used to form zeolite

C423S707000, C423S713000, C423SDIG022

Reexamination Certificate

active

07029650

ABSTRACT:
This invention relates to a process for making a germanium-zeolite. The zeolite is preferably a MFI-type structure, most preferably a ZSM-5 MFI zeolite. The germanium-zeolite is synthesized from an aqueous gel containing a silica source, a germanium source, an aluminum source and a structure directing agent in the presence of an acid to control the pH of the gel in the range of 6.5 to 13.5, preferably 7.5 to 11, to maximize the amount of germanium incorporated into the zeolite framework. Optionally, a sodium compound may be introduced into the reaction mixture gel either before or after the addition of the acid, preferably before.

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van de Water et al., “Ge-ZSM-5: the Simultaneous Incorporation of Ge and Al into ZSM-5 Using Parallel Synthesis Approach,” J. Phys. Chem. B, 107, pp. 10423-10430, 2003.
Kosslick et al., “Synthesis and Characterization of Ge-ZSM-5 Zeolites,” J. Phys. Chem., 97, 5678-5684, 1993.
Tuilier et al., “EXAFS Study of Germanium-Rich MFI-Type Zeolites,” ZEOLITES, 11, 99, 662-665, 1991.
Carey, Organic Chemistry, p. 863, 1987.

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