Novel Pd-based Three-Way Catalysts

Oxygen Storage/Redox Capacity and Related Phenomena on Ceria-Based Catalysts

“…Many attempts have been made to improve OSC properties and catalytic activity in modern TW catalysts. It seems that the incorporation of an extra stabilizer allows to reduce the ceria content while maintaining very high performance and durability of Pd-only or Pd-Rh catalysts [106]. In conclusion, the use of ternary Ce-Zr-X compounds (may be quaternary oxides) is certainly a way to a better control of OSC properties and to an increased stability of catalysts over longer periods on-stream in the converters.…”

Kinetics of Nitric Oxide Adsorption on Pd(111) Surfaces through Molecular Beam Experiments: A Quantitative Study

“…Often there is a trade-off as the air-rich fuel is necessary for complete oxidation of CO and volatile organic components, which is mandatory in all modern (Euro III low emission vehicles and ultralow emission vehicles) emission norms . In sharp contrast to this, fuel-rich conditions favor the reduction of NO, which is an important constituent of photochemical smog. − Sophistication in the design of novel catalysts, especially effective under net oxidizing conditions, such as zeolite-based ones with a NO x storage function, is increasing. , Introduction of Pd is comparatively a recent development, nevertheless it is the focus of several studies. − Pd has several advantages over Rh in effectively reducing NO x to N 2 even at oxidizing conditions, including a cost advantage.…”

An overview: Comparative kinetic behaviour of Pt, Rh and Pd in the NO + CO and NO + H2 reactions

“…Controversial results have been reported in the literature by Castner and Somorjai [14] who also observed a significant formation of N 2 O on Rh(s)-[6(111)·(100)] under UHV conditions. Now, regarding the use of Pd-only three-way catalysts, previous opportunities accounting for economical aspects [1,2,15] and based on the development of novel routes for the catalyst preparation could be debatable. In addition the formation of N 2 O on Pd may still occur after the achievement of three-way conditions contrarily to Rh or Pt.…”