Enhanced Thermal Stability of Pd/Ce–Sn–O Catalysts for CO Oxidation Prepared by Plasma-Arc Synthesis

Pt/CeO2 and Pt/CeSnOx Catalysts for Low-Temperature CO Oxidation Prepared by Plasma-Arc Technique

“…PAS method was applied to obtain PtCeC and PtCeSnC composite materials. We refer to the detailed description of the procedure in our previous work (Kardash et al, 2017 ). To obtain oxide catalysts, the synthesized PtCe(Sn)C composites were calcined in air at 600, 800, and 900°C.…”

“…The realization of the SMSI effect in PGM-CeO 2 systems depends crucially on the synthesis procedure. Different synthetic approaches are used to obtain PGM-CeO 2 catalysts with desired improved characteristics (Boronin et al, 2009; Gulyaev et al, 2012, 2014b; Slavinskaya et al, 2015, 2016, 2018; Vasilchenko et al, 2016; Derevyannikova et al, 2017; Kardash et al, 2017; Kibis et al, 2017). Novel physical preparation methods that utilize the action of thermal and electrical fields, such as laser ablation, magnetron sputtering, “solution-combustion” and plasma methods attracted attention of many research groups (Bera et al, 2003; Baidya et al, 2009; Hegde et al, 2009; Gupta and Hegde, 2010; Hinokuma et al, 2014; Slavinskaya et al, 2016, 2018; Vasilchenko et al, 2016; Stadnichenko et al, 2018, 2019).…”

“…Recently we have developed and applied a plasma-arc method (PAS) for synthesis of Pd/CeO 2 catalysts (Gulyaev et al, 2014b ; Kardash et al, 2017 ). The PAS method is based on the sputtering of a specific anode material in a vacuum chamber filled with an inert gas under action of a plasma arc discharge.…”

“…Our previous studied of the Pd/CeO 2 -SnO 2−x catalysts showed that introduction of Sn into PdCeC formulations during the PAS synthesis formed nano-heterogeneous composites after calcination of the PdCeSnC composite. The obtained catalysts were stable against sintering and crystallization to large particles (Kardash et al, 2017 ). As a result, LTO CO activity was preserved even after calcination at 1,000°C.…”

Transformation of a Pt–CeO2 Mechanical Mixture of Pulsed‐Laser‐Ablated Nanoparticles to a Highly Active Catalyst for Carbon Monoxide Oxidation

“…The latter interact with ceria to form the surface/subsurface solid solution Pd x Ce 1− x O 2− x − δ . Mild thermal treatment under oxidizing conditions led to segregation of palladium with the formation of the oxidized PdO x (s)/Pd−O−Ce(s) surface clusters, which possess weakly bound oxygen and are responsible for the low‐temperature activity in CO oxidation …”