Process for the chemical modification of aluminum oxide supported rhodium catalysts and associated automotive catalysts
Patent
·
OSTI ID:5769995
This patent describes a process for chemically modifying an aluminum oxide support for a rhodium catalyst suitable for use as an automotive catalyst in controlling automotive exhaust emissions. It comprises removing hydroxyl groups from the aluminum oxide support by silation to substantially prevent the oxidative conversion of supported metallic rhodium Rh{sub x}{sup (0)} to Rh{sup (1)}; and effecting the silation by exposure of the aluminum oxide support to an alkylhalosilane in the gas phase at a temperature preferably equal to or greater than about 450K.
- Assignee:
- Univ. of Pittsburgh, Pittsburgh, PA (United States)
- Patent Number(s):
- US 5028575; A
- Application Number:
- PPN: US 7-515385
- OSTI ID:
- 5769995
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
02 PETROLEUM
020400 -- Petroleum-- Processing
33 ADVANCED PROPULSION SYSTEMS
330700* -- Advanced Propulsion Systems-- Emission Control
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
AIR POLLUTION CONTROL
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
AUTOMOBILES
AUTOMOTIVE FUELS
CATALYST SUPPORTS
CATALYSTS
CATALYTIC CONVERTERS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL COMPOSITION
CONTROL
ELEMENTS
EQUIPMENT
EXHAUST SYSTEMS
FUELS
METALS
MODIFICATIONS
OXIDES
OXYGEN COMPOUNDS
PLATINUM METALS
POLLUTION CONTROL
POLLUTION CONTROL EQUIPMENT
RHODIUM
TRANSITION ELEMENTS
VEHICLES
020400 -- Petroleum-- Processing
33 ADVANCED PROPULSION SYSTEMS
330700* -- Advanced Propulsion Systems-- Emission Control
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
AIR POLLUTION CONTROL
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
AUTOMOBILES
AUTOMOTIVE FUELS
CATALYST SUPPORTS
CATALYSTS
CATALYTIC CONVERTERS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL COMPOSITION
CONTROL
ELEMENTS
EQUIPMENT
EXHAUST SYSTEMS
FUELS
METALS
MODIFICATIONS
OXIDES
OXYGEN COMPOUNDS
PLATINUM METALS
POLLUTION CONTROL
POLLUTION CONTROL EQUIPMENT
RHODIUM
TRANSITION ELEMENTS
VEHICLES