INSULATED EXHAUST MANIFOLD HAVING INTERNAL CATALYST SUPPORT BODY

摘要

An exhaust manifold is provided having ceramic inner and insulation layers. The manifold preferably has a metal outer structural layer to impart strength to the manifold. The ceramic layers are made of ceramic fibers with the interstitial spaces between the fibers being filled with ceramic filler material. The preferred ceramic fibers are aluminosilicate fibers. The preferred ceramic filler material is alumina, silica, glass-ceramic or other metal oxide. In a preferred embodiment, a catalyst-coated support body is provided in the exhaust manifold. As exhaust gases pass through the manifold, noxious components of the exhaust gases begin to convert to environmentally benign species from the catalyst present in the exhaust manifold prior to reaching the catalytic converter located downstream from the manifold. A method of making an exhaust manifold having ceramic inner and insulation layers is also provided.