Lance-type injection apparatus for introducing chemical agents i
Layered catalyst composite
Layered SOX tolerant NOX trap catalysts and methods of...
Lean NO.sub.x catalyst/trap method
Low pressure formation of a urea hydrolysate for nitrogen oxides
Low temperature catalytic reduction of nitrogen oxides
Low temperature process for the reduction of nitrgen oxides in a
Lowering of the nitrogen oxide levels in exhaust gases by contro