| http://www.w3.org/ns/prov#value | - Further, it is assumed that the interaction of different elements forming the NOx absorber makes detachment of the sulfur component readily. [0078] Also, combining Ba and the other elements (at least one of K, Sr, Mg and La) as discussed above is effective in making the NOx absorber into fine particles, and Sr is particularly effective in making Ba and Mg into fine particles.
|
