| 摘要 |
PROBLEM TO BE SOLVED: To provide a hydrogen supply/exhaust gas cleaning catalyst which is capable of adjusting a hydrogen concentration on the downstream side of the catalyst and an exhaust gas cleaning system for upgrading the cleaning performance of an NOx cleaning catalyst to be installed on the downstream side of the hydrogen supply/exhaust gas cleaning catalyst. SOLUTION: This hydrogen supply/exhaust gas cleaning catalyst contains a hydrogen generating catalyst component and a hydrogen occluding material and performs the generation, occlusion retention and emission of hydrogen to adjust the hydrogen concentration of an exhaust gas on the downstream side. In addition, the catalyst contains a hydrogen occlusion alloy as a hydrogen occluding material and/or a carbon nanotube. Further, the exhaust gas cleaning system has the NOx cleaning catalyst arranged on the downstream side of the hydrogen supply/exhaust gas cleaning catalyst. In addition, the system restricts the oxidation/consumption of hydrogen by occluding and retaining the hydrogen in the hydrogen occluding material and thereby increases the supply of the hydrogen to the NOx cleaning catalyst. |
