Method for providing and maintaining catalytically active...

F - Mech Eng,Light,Heat,Weapons – 02 – B

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F02B 23/00 (2006.01) F02B 51/02 (2006.01) F02B 77/02 (2006.01) F02B 77/11 (2006.01)

Patent

CA 2321457

A catalytically active surface is provided on the clean, combustion-exposed parts of an internal combustion engine that is green, has low operating hours, or is of modem, low emission design. A substrate or thermal barrier coat of high surface area and preferably capable of maintaining a surface temperature of at least 450 °C is deposited in the combustion chamber. Zirconia, silica, or lube oil ash are suitable. A catalytically active moiety such as platinum or iron is dispersed in, on, or with the combustion facing surface of the substrate. Nanophase iron from ferrocene or nanophase platinum are suitable. Catalytic action is maintained by continuously providing a low level of catalytic precursor to the engine in the combustion charge.

L'invention concerne une surface à activité catalytique fournie sur les parties propres, exposées à la combustion, d'un moteur à combustion interne, ce moteur étant un moteur non polluant, fonctionnant peu ou de conception moderne en ce qu'il émet peu de gaz polluants. On dépose un substrat ou un revêtement faisant barrière thermique qui possède une grande surface et qui maintient, de préférence, une température d'au moins 450 DEG C, appliquée dans la chambre de combustion. Le substrat est sélectionné parmi l'oxyde de zirconium, la silice ou des cendres d'huile lubrifiante. Un fragment à activité catalytique tel que du platine ou du fer est dispersé dans, sur ou avec la surface du substrat qui est exposée à la combustion. Du fer en phase nanométrique issu du ferrocène ou du platine en nanophase peuvent également convenir. L'action catalytique est maintenue en envoyant continuellement une faible quantité de précurseur dans la charge de combustion, vers le moteur.

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