ZSM-5 catalysts having predominately framework gallium, methods of their preparation, and use thereof

Patent · Tue Nov 06 04:00:00 EST 1990

OSTI ID:5202105

Chu, C T; Han, S

This patent describes a method of introducing gallium as a zeolitic element in the framework of ZSM-5, wherein the resulting gallium incorporated ZSM-5 is substantially free of non-framework gallium. It comprises preparing a ZSM-5 crystallization reaction mixture by forming a hydrogel containing a source of SiO{sub 2} and a source of Ga{sub 2}O{sub 3} wherein the SiO{sub 2} to the Ga{sub 2}O{sub 3} is present in a molar ratio of less than 100/1; adding to the reaction mixture an amount of Na{sub 2}SO{sub 4} such that the molar ratio of SiO{sub 2} to Na{sub 2}SO{sub 4} ranges from 20/1 to 0.1/1 and is effective to cause the gallium content of the resulting zeolite to be a zeolitic framework element; maintaining the reaction mixture under conditions effective to cause formation of the gallium incorporated ZSM-5 and recovering the gallium incorporated ZSM-5.

• Assignee: Mobil Oil Co., New York, NY (USA)
• Patent Number(s): A; US 4968650
• Application Number: PPN: US 7-340337
• OSTI ID: 5202105
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400* -- Petroleum-- Processing
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
ALKALI METAL COMPOUNDS
CATALYSTS
CHALCOGENIDES
CHEMICAL COMPOSITION
GALLIUM COMPOUNDS
GALLIUM OXIDES
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MATERIALS
MINERALS
OXIDES
OXYGEN COMPOUNDS
SILICATE MINERALS
SILICON COMPOUNDS
SILICON OXIDES
SODIUM COMPOUNDS
SODIUM SULFATES
SULFATES
SULFUR COMPOUNDS
SYNTHESIS
ZEOLITES