CATALYST FOR PURIFYING EXHAUST GAS

摘要

PURPOSE:To reduce the amount of HC released into the atmosphere and to secure HC necessary for decomposing NOx by a NOx catalyst. CONSTITUTION:HC is adsorbed by mixing a NOx purification catalyst in which a catalyst metal is supported on zeolite and a HC adsorbent which adsorbs HC in exhaust gas and desorbs the adsorbed HC at a specified temperature or higher or by overlapping a NOx catalyst layer 3 and a HC adsorbent layer on a support 1, and HC desorbed from the HC adsorbent is used for decomposing NOx.