Porous glass supports for automotive emissions control catalysts

Patent · Tue Apr 16 00:00:00 EDT 1974

OSTI ID:7361785

Elmer, T H; Tischer, R E

A stabilized porous glass support material for noble metal and base metal catalysts is described. It is useful in the catalytic conversion of harmful automotive exhaust emissions. A process for preparing the support material and methods for using it in automotive pollution control systems are also described. The porous 96 percent silica glasses are suitable support materials for base and noble metal catalytic coatings from the standpoint of surface area and porosity and act as a scavenger for trace metallic ion impurities in exhaust fumes to prevent poisoning of the catalyst. Early attempts to use porous glasses as substrate materials for catalysts were only partially successful because of the marginal thermal stability of the glass as a support material caused by the migration of the boron in such glasses to the surface of the material on heating and the subsequent blocking of active sites on the catalyst by the liberated boron causing catalytic poisoning. The present invention provides novel methods for employing a stabilized porous 96 percent silica glass in which the surface boron is extracted. The present invention provides the required surface area, porosity, and thermal stability for automotive catalytic systems.

• Assignee: Corning Glass Works
• Patent Number(s): US 3804647
• OSTI ID: 7361785
• Resource Relation: Patent File Date: Filed date 15 Dec 1971
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
AUTOMOBILES
CATALYTIC CONVERTERS
MATERIALS
CATALYSTS
GLASS
POROSITY
SILICON OXIDES
STABILITY
SUPPORTS
TEMPERATURE EFFECTS
CHALCOGENIDES
EQUIPMENT
MECHANICAL STRUCTURES
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL EQUIPMENT
SILICON COMPOUNDS
VEHICLES
330700* - Advanced Propulsion Systems- Emission Control