Structural transformation of Pd-α-Fe₂O₃ and Pd-γ-Fe₂O₃ catalysts and application in the CO oxidation reaction

Abstract

Pd-α-Fe2O3 and Pd-γ-Fe2O3 catalysts can be obtained by redox pretreatment and exhibit different reactive performances during CO oxidation.

Synergistic Effect of Redox Dual PdOx/MnOx Cocatalysts on the Enhanced H2 Production Potential of a SnS/α-Fe2O3 Heterojunction via Ethanol Photoreforming

“…The core-level high-resolution orbital scan of the Pd 3d spectra were deconvoluted into four peaks centered at BEs of 336.9, 335.4, 342.4, and 343.5 eV, respectively (Figure (g)). The high intensity peaks at BEs of 336.9 (3d 5/2 ) and 342.4 eV (3d 3/2 ) are assigned to Pd 2+ from the palladium precursor (PdCl 2 ) or PdO, which is in agreement with the reported value of the BE at 336.8–337.4 eV . The very low intensity peaks at BEs of 337.7 and 343.5 eV are attributed to Pd 4+ , suggesting that a low percentage of Pd 2+ has been oxidized during the impregnation/calcination process .…”

“…The high intensity peaks at BEs of 336.9 (3d 5/2 ) and 342.4 eV (3d 3/2 ) are assigned to Pd 2+ from the palladium precursor (PdCl 2 ) or PdO, which is in agreement with the reported value of the BE at 336.8−337.4 eV. 56 The very low intensity peaks at BEs of 337.7 and 343.5 eV are attributed to Pd 4+ , suggesting that a low percentage of Pd 2+ has been oxidized during the impregnation/calcination process. 57 There was no metallic Pd (Pd 0 ) detected on the surface of the catalyst with typical BEs of 335.1 and 341.1 eV.…”

Comparision on the Low-Temperature NH3-SCR Performance of γ-Fe2O3 Catalysts Prepared by Two Different Methods

“…The octahedral and tetrahedral interstitial sites in the γ-Fe 2 O 3 structure along with octahedral vacancies could be seen. Apart from this, γ-Fe 2 O 3 can also facilitate CO oxidation [10] desulfurization [11] and mercury oxidation [12].…”