Engine with system for exhaust gas purification

摘要

A system for exhaust gas purification disposed in the exhaust pipe of an internal combustion engine, which includes a zeolite as adsorbent component capable of adsorbing the hydrocarbons present in the exhaust gas emitted from the engine and a catalyst capable of reducing the harmful substances present in the exhaust gas; the system satisfies the following condition: $wherein\; a\; is\; the\; total\; volume\; of\; the\; pores\; of\; diameters\; of\; 10\; ANGSTROM\; or\; smaller\; possessed\; by\; the\; zeolite\; as\; measured\; using\; N2,\; and\; c\; is\; the\; total\; amount\; of\; the\; hydrocarbons\; emitted\; from\; the\; engine\; during\; the\; period\; of\; 140\; seconds\; from\; the\; start\; of\; the\; engine\; when\; the\; engine\; is\; operated\; in\; accordance\; with\; the\; LA-4\; mode\; of\; FTP,\; thereby\; the\; adsorption\; capacity\; of\; the\; zeolite\; used\; as\; a\; HC\; adsorbent\; is\; optimized\; against\; the\; amount\; of\; the\; HC\; discharged\; from\; an\; engine\; during\; a\; certain\; period\; of\; the\; cold\; start\; so\; as\; to\; adsorb\; and\; purify\; the\; HC\; effectively.$