Thermally stable chromium-exchanged zeolites and method of making same
A method is described of making a thermally stable Cu-Cr zeolite, said method comprising: (a) providing a Y zeolite having an alkali content of less than about 0.5% by weight based on the oxide, and having a SiO[sub 2] to Al[sub 2]o[sub 3] mole ratio of about 3 to about 200, and copper and chromium ions exchanged therein, wherein said alkali content is provided at least before the Cr ions are exchanged therein, the weight ratio of Cu:Cr being about 1:1 to about 1:4; and (b) heat-treating said Cu-Cr-exchanged zeolite to produce said thermally stable Cu-Cr zeolite wherein the BET surface area of said thermally stable zeolite upon exposure to temperatures of up to about 1000 C is at least about 50% of the BET surface area of said starting zeolite at about room temperature, prior to said exposure to temperatures of up to about 1,000 C. A Cu-Cr-exchanged zeolite produced by the method of claim 1 is also described.
- Assignee:
- Corning Inc., Corning, NY (United States)
- Patent Number(s):
- A; US 5234876
- Application Number:
- PPN: US 7-963602
- OSTI ID:
- 6047089
- Country of Publication:
- United States
- Language:
- English
Similar Records
Catalytic conversion of hydrocarbons by improved zeolite catalyst
Method for increasing the hydrocarbon sorption capacity of a zeolite
Related Subjects
400201* -- Chemical & Physicochemical Properties
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CATALYSTS
CHALCOGENIDES
CHEMICAL PREPARATION
CHROMIUM
CONCENTRATION RATIO
COPPER
ELEMENTS
HEAT TREATMENTS
INORGANIC ION EXCHANGERS
ION EXCHANGE
ION EXCHANGE MATERIALS
MATERIALS
METALS
MINERALS
OXIDES
OXYGEN COMPOUNDS
SILICATE MINERALS
SILICON COMPOUNDS
SILICON OXIDES
STABILITY
SURFACE AREA
SURFACE PROPERTIES
SYNTHESIS
TRANSITION ELEMENTS
ZEOLITES