| 摘要 |
PROBLEM TO BE SOLVED: To provide a urea SCR catalyst which is capable of purifying NOx exhausted from an engine at low temperature and to provide a post-treatment system for exhaust gas.SOLUTION: In a urea SCR catalyst which reduces NOx in exhaust gas with ammonia, Al ions are introduced into iron silicate in which Fe leaves partially from the inside of the iron silicate skeleton, and some of the Al ions are introduced into the skeleton and the remaining Al ions are made to coexist with Fe that has left to the outside of the skeleton. |
