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US 6,531,099 B1Granted
Oxide gas absorbing arrangement and method
AssigneeVolkswagen Aktiengesellschaft
InventorWolfgang Held
Life of this patent
Estimating the term…
Abstract
In the oxide gas absorbing arrangement disclosed in the specification, metal foils having a thickness ≦0.05 mm are coated with an oxide gas absorbing layer containing gamma aluminum oxide. One metal foil is corrugated and joined to a smooth foil and the combined foils are rolled into a cylinder to provide parallel gas passages in which exhaust gases are exposed to the oxide gas absorbing layer. To enhance absorption turbulence is created in the gas passages by twisting the cylinder to narrow and contort the individual passages.
Claims31
An oxide gas absorbing arrangement comprising:
- a support member having a region with a surface exposed to a flow of gas;
- and
- an absorption layer on the surface of the support member, said absorption layer having a thickness ≧50 um and providing a total surface area which is larger than the area of the support member surface on which the absorption layer is cooked, exposed to a flow of gas and capable of absorbing at least one nitrogen oxide and/or at least one oxide of sulfur at a selected temperature and releasing the absorbed oxide at a temperature higher than the selected temperature, wherein the support member has a wall thickness ≦0.16 mm in the region provided with the absorption layer to minimize the time required to heat the absorption layer to the higher temperature.
An oxide gas absorbing arrangement comprising:
- a metal support member having a surface exposed to a flow of gas, and
- an absorption layer on the surface exposed to a flow of gas, said absorption layer having a thickness ≧50 um and providing a surface area which is capable of absorbing at least one nitrogen oxide and/or at least one oxide of sulfur at a selected temperature and releasing the absorbed oxide at a higher temperature wherein the support member has a wall thickness ≦0.16 mm so that the heat conductivity of the metal support member is effective to minimize the time required to heat the absorption layer to the higher temperature.
Dependencies are inferred from the claim text.