05451385 is referenced by 11 patents and cites 15 patents.

Nitrogen oxides and carbon monoxide are removed from the exhaust of an internal combustion engine which operates on a methane-containing fuel by reacting the carbon monoxide, nitrogen oxides, and oxygen in the exhaust gas with methane in the presence of a catalyst comprising a crystalline zeolite having a silicon to aluminum ratio of equal to or greater than about 2.5 which is exchanged with a cation selected from the group consisting of cobalt, nickel, iron, chromium, rhodium, gallium, and manganese. Methane for the reaction is provided as a portion of the methane-containing fuel.

Title
Control of exhaust emissions from methane-fueled internal combustion engines
Application Number
739273
Publication Number
5451385
Application Date
November 25, 1992
Publication Date
September 19, 1995
Inventor
Yuejin Li
Allentown
PA, US
John N Armor
Orefield
PA, US
Jack L Stolz
Allentown
PA, US
S Venkat Raman
Emmaus
PA, US
James G Hansel
Emmaus
PA, US
Agent
William F Marsh
John M Fernbacher
Assignee
Air Products and Chemicals
PA, US
IPC
B01D 53/72
B01D 53/62
B01D 53/56
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