Ternary catalyst
The invention provides a ternary catalyst including a porous ceramic carrier and a catalyst coating which is adhered on the porous ceramic carrier; the catalyst coating comprises a gamma-Al2O3 and rare earth-transition metal composite oxide and a noble metal active component; the noble metal active...
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Format: | Patent |
Sprache: | eng |
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Zusammenfassung: | The invention provides a ternary catalyst including a porous ceramic carrier and a catalyst coating which is adhered on the porous ceramic carrier; the catalyst coating comprises a gamma-Al2O3 and rare earth-transition metal composite oxide and a noble metal active component; the noble metal active component includes Pt, Rh and Pd; the catalyst coating comprises a gamma-Al2O3 coating which is adhered on the porous ceramic carrier, a Pt coating which is adhered on the surface of the gamma-Al2O3 coating, a Pd, Rh, gamma-Al2O3 and rare earth-transition metal composite oxide mixed coating which is adhered on the Pt coating, and a Rh, gamma-Al2O3 and rare earth-transition metal composite oxide mixed coating which is adhered on the Pd, Rh, gamma-Al2O3 and rare earth-transition metal composite oxide mixed coating; by adjusting of the size of the carrier, oxygen storage component selection, and proportion and content of noble metals, a better catalytic effect is achieved, and the requirements of high standard emission can be met. |
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