Operation of diesel engines with reduced particulate emission by

Details Operation of diesel engines with reduced particulate emission by Operation of diesel engines with reduced particulate emission by

1995-03-14

1996-03-26

Howard, Jacqueline V.

Fuel and related compositions

Liquid fuels

Aluminum or heavy metal, other than lead, containing

44361, 44359, 44363, 44364, C10L 130

Patent

active

055017142

ABSTRACT:
The invention provides a method employing a fuel additive to improve the operation of a pass-through oxidation catalyst over long periods of time with continued catalytic activity and without the undesirable conversion of SO.sub.2 to SO.sub.3. A pass-through catalyst support is continuously, selectively catalyzed by the combustion of a fuel containing a platinum group metal composition which burns to release the catalyst metal in active form. The effectiveness of the process is attributed to improved combustion in the engine by the catalyst and the treatment of the catalytic oxidizer with active catalyst metal released during combustion such that, in the exhaust system, the soluble organic fraction of the particulates and the levels of gaseous unburned hydrocarbons and carbon monoxide are significantly reduced. The catalysts conditioned by the present invention cause minimal conversion of SO.sub.2 to SO.sub.3. The platinum group metal compositions soluble or dispersible in the diesel fuel and are added in amounts effective to provide concentrations of the metal in the fuel of less than 1 part per million (ppm).

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