Development of high performance, Pd-based, three way catalysts |
| |
| Authors: | V. G. Papadakis C. A. Pliangos I. V. Yentekakis X. E. Verykios C. G. Vayenas |
| |
| Affiliation: | Department of Chemical Engineering, University of Patras, and Institute of Chemical Engineering and High Temperature Chemical Processes, PO Box 1414, GR-265 00, Patras, Greece |
| |
| Abstract: | The use of Pd in three-way catalytic (TWC) converters of automobiles presents serious limitations which are related to sintering, poisoning and excessive selectivity for HC and CO oxidation, making NOx reduction difficult. In the present work, an advanced automotive exhaust catalyst design is applied which reduces, to a large extent, these shortcomings of Pd. This catalyst is based on dispersion of Pd on YSZ (ZrO2 stabilized with 8 mol-% Y2O3) forming the internal layer of a three-layer washcoat. The external layers contain small quantities of Pt and Rh dispersed on suitable supports, such as γ-Al2O3 and W6+-doped TiO2, respectively. This scheme offers a high performance TWC with low light-off temperature for the conversion of all three pollutants (CO, HC and NOx), enhanced poisoning tolerance and improved thermal resistance. |
| |
| Keywords: | Automotive catalyst Carbon monoxide oxidation Hydrocarbon oxidation Nitric oxide reduction Palladium YSZ |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
