Process for making a germanium-zeolite
AssigneeSaudi Basic Industries Corporation
InventorsGopalakrishnan G. Juttu, Alla Konstantin Khanmamedova, Scott F. Mitchell
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Abstract
This invention relates to a process for making a germanium-zeolite without using fluoride compounds. The zeolite is preferably a MFI-type structure, most preferably a ZSM-5 MFI zeolite. The germanium-zeolite is synthesized essentially in the absence of fluoride compounds 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 which does not contain fluorine, such as sulfuric acid, acetic acid, nitric acid, phosphoric acid hydrochloric acid or formic acid.
Claims23
A process for synthesizing an aluminum-silicon-germanium zeolite comprising:
- a) forming a reaction mixture by combining a silica source, a germanium source, an aluminum source, a structure directing agent and water to form a gel;
- b) mixing the reaction mixture;
- c) introducing an acid which does not contain fluorine;
- d) heating the reaction mixture to form zeolite crystals;
- e) cooling the reaction mixture;
- f) separating the zeolite crystals from the gel;
- g) washing the zeolite crystals;
- h) drying the zeolite crystals;
- and
- i) calcining the zeolite crystals
- wherein the aluminum-silicon-germanium zeolite is synthesized without a fluoride compound.
Dependencies are inferred from the claim text.