Abstract
The noble metals (Pt, Pd, Rh) supported on Cu-Ce mixed oxides with γ-Al2O3 washcoat/FeCrAl substrate were investigated as catalytic performance of Three Way Catalysts (TWC) under simulated automotive exhaust feed gas. The structural, morphological features and catalytic activity were observed by X-ray diffractometry (XRD), scanning electron microscopy (SEM), Brunauer-Emmett-Teller (BET), X-ray photoelectron spectroscopy (XPS) and GC-TCD (Varian CP-4900). The catalytic performance of noble metals (Pt, Rh, Pd) supported on Cu-Ce mixed oxides with γ-Al2O3 washcoat/FeCrAl substrate was be compared with noble metals (Pt, Rh, Pd) supported on Ce-Zr mixed oxides with γ-Al2O3 washcoat/FeCrAl substrate and only γ-Al2O3 washcoat/FeCrAl substrate at various stoichiometric ratio of oxygen. The results showed that the addition of Cu-Ce mixed oxides improved CO oxidation reaction at lower temperature during stable lambda of 1, the highest CO conversion of 99% is observed for the noble metals (Pt, Pd, Rh) support on Cu-Ce with γ-Al2O3 washcoat/FeCrAl substrate. The results also showed that, the addition of Cu-Ce mixed oxides promoted released oxygen, thus it improved strongly CO and C3H8 conversion at lean oxygen stoichiometric operation.
Highlights
Three way catalysts (TWCs) are capable of simultaneous converting CO, hydrocarbon (HC) and nitrogen oxides (NOx) into harmless CO2, H2O and N2
The results showed that the addition of Cu-Ce mixed oxides improved CO oxidation reaction at lower temperature during stable lambda of 1, the highest CO conversion of 99% is observed for the noble metals (Pt, Pd, Rh) support on Cu-Ce with γ-Al2O3 washcoat/FeCrAl substrate
The aim of this study is to investigate catalytic performance of noble metals supported on Cu-Ce mixed oxides with γ-Al2O3 washcoat/FeCrAl substrate
Summary
Three way catalysts (TWCs) are capable of simultaneous converting CO, hydrocarbon (HC) and nitrogen oxides (NOx) into harmless CO2, H2O and N2. Oxygen storage capacity (OSC) is one of the crucial factors for the performance of TWCs, and the higher OSC promotes the better dynamic performance of catalysts in converting CO, HC and NOx under conditions from rich to lean A/F (λ-value) in automotive. CeO2-ZrO2 solid solution is well-known as an excellent supporter for OSC [1]. CeO2 exhibits oxygen storage/release behavior by the redox reaction of Ce ions between Ce3+ and Ce4+ [2], and the introduction of ZrO2 into CeO2 improves the reduction temperature of CeO2 through structural modification of CeO2 [3]. Among many studies on CeO2 based materials such as CeO2-Al2O3 [4], CeO2-SiO2 [5], CeO2-La2O3 [3] [6] [7], CeO2-TbOx [8], and CeO2-PrOx [9] have been reported to improve OSC and increase the thermal stability
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