A device (catalytic converter) for purifying an exhaust gas. This device has a first catalyst for purifying a NOx of the exhaust gas. This first catalyst contains first and second powders. The first powder has a porous carrier and at least one noble metal loaded on the porous carrier. The at least o
A device (catalytic converter) for purifying an exhaust gas. This device has a first catalyst for purifying a NOx of the exhaust gas. This first catalyst contains first and second powders. The first powder has a porous carrier and at least one noble metal loaded on the porous carrier. The at least one noble metal is selected from platinum, palladium and rhodium. The second powder has a first double oxide represented by the general formula (Ln1-.alpha.A.alpha.)1-.beta.BO.delta. where .alpha. is a number that is greater than 0 and less than 1, .beta. is a number that is greater than 0 and less than 1, .delta. is a number that is greater than 0, Ln is at least one first element selected from La, Ce, Nd and Sm, A is at least one second element selected from Mg, Ca, Sr, Ba, Na, K and Cs, and B is at least one third element selected from Fe, Co, Ni and Mn. The device is improved in capability of purifying NOx contained in an oxygen rich exhaust gas.
대표청구항▼
1. A catalyst system for purifying an exhaust gas, said catalyst system comprising a first catalyst for purifying a NOx of the exhaust gas, said first catalyst comprising:
a first powder comprising a porous carrier and a noble metal loaded on said porous carrier, said noble metal being selected from
1. A catalyst system for purifying an exhaust gas, said catalyst system comprising a first catalyst for purifying a NOx of the exhaust gas, said first catalyst comprising:
a first powder comprising a porous carrier and a noble metal loaded on said porous carrier, said noble metal being selected from the group consisting of platinum, palladium and rhodium; and
a second powder comprising a first double oxide represented by the following general formula (1):
(Ln1-.alpha.A.alpha.)1-.beta.BO.delta. (1)
where .alpha. is a number that is greater than 0 and less than 1, .beta. is a number that is greater than 0 and less than 1, .delta. is a number that is greater than 0, Ln is a first element selected from the group consisting of La, Ce, Nd and Sm, A is a second element selected from the group consisting of Mg, Ca, Sr, Ba, Na, K and Cs, and B is a third element selected from the group consisting of Fe, Co, Ni and Mn,
wherein each of said first and second powders has an average particle diameter of not greater than 4 .mu.m.
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