Preparation, characterisation and N2O decomposition activity of honeycomb monolith-supported Rh/Ce0.9Pr0.1O2 catalysts

Effect of RhOx/CeO2 Calcination on Metal-Support Interaction and Catalytic Activity for N2O Decomposition

“…The redox properties of the support play an important role in the stabilization of cationic rhodium species under reaction conditions, and best Rh/Ceria catalysts where those with a highly reducible CeO2 surface. The current results suggest that flash calcination of rhodium nitrate (starting heating either at 250 or 350 °C) allows obtaining a much better noble metal-support interaction than the conventional ramp calcinations (starting heating at 25 °C) [18,29], which was confirmed by TEM analysis.…”

“…The catalyst where rhodium nitrate was decomposed in ramp (starting heating at 25 °C (Rh25Ce25)), which is the most conventional calcination procedure, presents lower activity than catalysts calcined by a flash procedure (Rh250Ce25 and Rh350Ce25 catalysts). As postulated in a previous publication [18], this can be tentatively attributed to the improved interaction between rhodium and ceria particles obtained by flash calcinations and this interaction is studied in detail in the coming sections.…”

“…Rh was the best noble metal, and the support strongly affected the activity, ceria-based supports being better as rhodium support than alumina. In a further study [18], the Rh/Ce0.9Pr0.1O2 active phase was supported on a cordierite monolith, and one of the conclusions reported was that the calcination procedure affects the Rh-Ce-Pr interactions and the homogeneous distribution of the active phases on the substrate. It was observed that catalysts prepared by flash calcinations, consisting of introducing the monolith impregnated with metal precursor salts in a previously heated furnace, are more active for N2O decomposition than the counterpart catalysts calcined by a conventional ramp heating.…”

Preparation and characterisation of γ-Al2O3 particles-supported Rh/Ce0.9Pr0.1O2 catalyst for N2O decomposition in the presence of O2, H2O and NOx

“…In addition, powder active phases are useful for basic research but not for most industrial applications, and loading the active phases in an appropriate inert support is required. Recently, Rh/CeO 2 (Pr) active phases were successfully supported on cordierite monoliths by impregnation and decomposition of the metal precursors (Rico-Pérez et al, 2011). Alumina carriers are also among the most used catalyst supports, including pure alumina particles, pellets or monoliths and also alumina coated-cordierite monoliths.…”

Catalytic performance of CuO/Ce0.8Zr0.2O2 loaded onto SiC-DPF in NOx-assisted combustion of diesel soot

“…[36][37][38][39][40][41][42] In order to study the morphology of the catalyst anchored to the DPF walls, Scanning Electron Microscopy (SEM) was performed in a HITACHI S-3000N microscope with a secondary electron detector, a retrodispersed electron detector and X-ray detector (XFlash 3001 from Bruker) for microanalysis and chemical mapping. Previous to SEM characterization, a bare and a coated lter were cut into different pieces to examine the inner channel walls and cross sections.…”