Pt-containing catalyst suitable for gasoline vehicle tail gas purification, and preparation method thereof
A tail gas purification and catalyst technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of Pt replacing Pd catalysts with thermal stability decline, and achieve excellent Effects of anti-aging performance, improvement of catalytic performance, and improvement of thermal aging ability
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[0030]Example 1:
[0031]Bottom coating composition:
[0032]The bottom coating is a Pt-Pd layer with a Pt content of 50g / ft3, Pd content is 50g / ft3. Impregnated in the first cerium-zirconium composite oxide (40wt% CeO2, 55wt% ZrO2, 5wt% La2O3) Pt is 40g / ft3,Pd is 10g / ft3, CeO2The content is 5% of the first cerium-zirconium composite oxide. The Pt impregnated in lanthanum modified alumina (1% lanthanum content) is 10g / ft3,Pd is 40g / ft3, BaO content is 5% of lanthanum modified alumina, the first cerium-zirconium composite oxide in the bottom coating is 50g / L, lanthanum modified alumina is 50g / L, the binder aluminum sol is 3g / L, total The coating amount is 103g / L.
[0033]The composition of the upper coating:
[0034]Rh layer of upper coating, Rh content is 10g / ft3. Among them, the second cerium-zirconium composite oxide (10wt% CeO2,85wt%ZrO2, 5wt% La2O3) The impregnation is 7.0gRh and 1% Nd2O3, Rh of immersed in lanthanum modified alumina (1% lanthanum) is 3.0g / ft3The second cerium-zirconium com...
Example Embodiment
[0042]Example 2:
[0043]Bottom coating composition:
[0044]The bottom coating is a Pt-Pd layer with a Pt content of 20g / ft3, Pd content is 20g / ft3. Impregnated in the first cerium-zirconium composite oxide (40wt% CeO2, 55wt% ZrO2, 5wt%Pr6O11) Pt is 19g / ft3, Pd is 1g / ft3, CeO2The content is 5% of the first cerium-zirconium composite oxide, and the first cerium-zirconium composite oxide is 1g / ft of Pt impregnated in lanthanum modified alumina (the lanthanum content is 5wt%)3, Pd is 19g / ft3, BaO content is 10wt% of lanthanum modified alumina, the first cerium-zirconium composite oxide in the bottom coating is 50g / L, lanthanum modified alumina is 50g / L, the binder aluminum sol is 10g / L, total The coating amount is 110g / L.
[0045]The composition of the upper coating:
[0046]Rh layer of upper coating, Rh content is 10g / ft3. Among them, the second cerium-zirconium composite oxide (10wt% CeO2,85wt%ZrO2, 5wt%Nd2O3) The impregnation is 9g / ft3Rh and 5% Nd2O3, Impregnated in lanthanum modified alumina ...
Example Embodiment
[0054]Example 3:
[0055]Bottom coating composition:
[0056]The bottom coating is a Pt-Pd layer with a Pt content of 150g / ft3, Pd content is 50g / ft3. Impregnated in the first cerium-zirconium composite oxide (40wt% CeO2, 55wt% ZrO2, 5wt% Pr6O11) Pt is 140g / ft3,Pd is 10g / ft3, CeO2The content is 10% of the first cerium-zirconium composite oxide, and the first cerium-zirconium composite oxide is 10g / ft of Pt impregnated in lanthanum modified alumina (lanthanum content is 10%)3,Pd is 40g / ft3, SrO content is 8% of lanthanum modified alumina, the first cerium-zirconium composite oxide in the bottom coating is 150g / L, lanthanum modified alumina is 40g / L, the binder aluminum sol is 10g / L, total The coating amount is 200g / L.
[0057]The composition of the upper coating:
[0058]Rh layer of upper coating, Rh content is 20g / ft3. Among them, the second cerium-zirconium composite oxide (10wt% CeO2, 85wt% ZrO2, 5wt% Nd2O3) The impregnation is 16g / ft3Rh and 5% Nd2O3, Rh impregnated in lanthanum modified alum...
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