Title:
NOx吸収材及びこれを用いた排ガス浄化用触媒
Document Type and Number:
Japanese Patent JP3622893
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To obtain an NOx absorbent material having better NOx absorbing performance and a catalyst for the purification of exhaust gas excellent in durability as well as in purifying performance. SOLUTION: The NOx absorbent material contains barium and an alkali metal and/or an alkaline earth metal other than barium. In the X-ray diffraction pattern of the NOx absorbent material a peak due to the (111) face of BaCO3 is present and the intensity ratio (IA/IF) of the intensity IA of the peak after long-term use to the initial intensity IF is 0.2-1. The catalyst for the purification of exhaust gas contains the NOx absorbent material and platinum and/or palladium. The above constituent metals of the NOx absorbent material are carried by an impregnation method using an aqueous solution of salts of the metals.
Inventors:
Hanaki Yasunari
Katsuo Suga
Katsuo Suga
Application Number:
JP18907699A
Publication Date:
February 23, 2005
Filing Date:
July 02, 1999
Export Citation:
Assignee:
Nissan Motor Co., Ltd
International Classes:
B01J20/04; B01J31/04; F01N3/08; F01N3/10; B01D53/94; (IPC1-7): B01J20/04; B01D53/94; B01J31/04; F01N3/08; F01N3/10
Attorney, Agent or Firm:
Janggi Motonori