| 摘要 |
It is intend to provide at low cost an exhaust gas purifier capable of in an internal combustion engine or other combustion instrument mainly driven under excess air conditions, efficiently removing nitrogen oxides from exhaust gas. A nitrogen oxide adsorbent (4) is disposed in an exhaust passage, which the nitrogen oxide adsorbent (4) is composed of a lithium composite oxide of the general formula LiAxOy or LiAxPO4, containing as constituent elements lithium (Li) and at least one element (A) selected from the group consisting of manganese (Mn), nickel (Ni), cobalt (Co), vanadium (V), chromium (Cr), iron (Fe), titanium (Ti), scandium (Sc), and yttrium (Y). For example, the nitrogen oxide adsorbent (4) is composed of a lithium composite oxide, such as lithium manganate (LiMnO3), the lithium titanate (Li2TiO3) or lithium manganate phosphate (LiMnPO4). |
