Impact of Test Conditions on the Oxygen Storage Capacity of Pd Loaded Cerium Zirconium Oxide

Abstract

An alternative method to determine the oxygen storage capacity (OSC) for powder materials is proposed in the current work. Dynamic and static OSC measurements were conducted at 510°C using a thermally aged Pd loaded cerium zirconium oxide (30 wt% ceria, 1 wt% Pd). Particularly the influence of water and carbon dioxide in the gas feed on OSC determination was studied. The results demonstrate that the absence of H 2 O/CO 2 and a static test procedure lead to overrated oxygen storage capacities. The method proposed here provides a simple, but not oversimplified method to determine the oxygen storage capacity under conditions closer to real applications by imitating the transient working mode of a gasoline engine and paying more attention to the exhaust gas composition.

Zirconium in modern analytical chemistry

“…Zirconium can also be a part of high entropy alloys, known for their structural and phase formation features (Yurchenko et al, 2017;Zhao et al, 2017). Zirconium compounds (oxide, alloys, and salts) are widely used as catalysts, for example in redox reactions and isomerization reactions (Zhang & Li, 2009;Molnar, 2011;Vining, Strunk & Bell, 2011;Cao et al, 2016;Keitl et al, 2017); in the perfumery industry, they are used as components of antiperspirants (Shen and Nardello-Rataj 2009).…”

Low-Temperature Growth of Reactive Pyrochlore Nanostructures on Zirconia-Supported Ceria: Implications for Improved Catalytic Behavior

“…The ability to take up, release, and conduct oxygen enables most of the mechanisms in ceria-based functional materials. , In particular, mixed oxides of ceria have shown superior properties (mostly by control of the oxygen vacancy concentration and phase stability), and almost all technically used catalysts and cocatalysts are either mixed oxides or doped materials. Mixed oxides with gadolinium and zirconium are the most common (e.g., GDC). , Ceria–zirconia mixed oxides have proven to be versatile oxides for a vast range of catalysts and cocatalysts, often in combination with noble metals.…”