The redispersion behaviour of Pt on the surface of Fe₂O₃

Abstract

Pt could be redispersed on the surface of Fe2O3 with alternating treatment under oxidative and reductive atmospheres.

Enhanced Antioxidation Stability of Iron-Based Catalysts via Surface Decoration with ppm Platinum

“…The coexistence of different valence provides the possibility for the formation of defects and oxygen vacancies, which were believed to benefit the trapping and anchoring of Pt atoms. 27 No diffraction peaks associated with Pt species were observed with increasing Pt content from 0.02 to 0.1 wt %, demonstrating that Pt species are highly dispersed with their particle sizes below the detection limit of XRD measurements. It is well-known that metallic Fe is active for the HDO reaction, and Fe-based catalysts should be reduced to metallic Fe before the reaction.…”

“…These results demonstrated that Fe 3+ and Fe 2+ coexisted in the prepared materials. The coexistence of different valence provides the possibility for the formation of defects and oxygen vacancies, which were believed to benefit the trapping and anchoring of Pt atoms . No diffraction peaks associated with Pt species were observed with increasing Pt content from 0.02 to 0.1 wt %, demonstrating that Pt species are highly dispersed with their particle sizes below the detection limit of XRD measurements.…”

In Situ Incorporation Strategy for Bimetallic FeCo‐Doped Carbon as Highly Efficient Bifunctional Oxygen Electrocatalysts

“…In terms of high‐resolution Fe 2p spectra (Figure b), the peaks appear at 709.6 and 711.6 eV can be ascribed to Fe 2+ and Fe 3+ in Fe 2p3/2 orbitals, indicating ionic Fe in FeCo alloy . The peak at 718.0 eV and 724.0 eV correspond to satellite peak of Fe 3+ and Fe 2+ in Fe 2p1/2 orbitals ,. Additionally, two peaks located around 779.3 and 793.9 eV in Co 2p spectra indicate metallic state Co (Figure c ) .…”

Solid-State Dispersions of Platinum in the SnO2 and Fe2O3 Nanomaterials

“…In the pristine α- In the pristine α-Fe2O3 (sample FE-0), the reduction starts at 300 °C and shows two peaks at 421 and 629 °C. The first maximum at 421 °C corresponds to the reduction of α-Fe2O3 → Fe3O4, and the second maximum at 629 °C to the reduction of Fe3O4 → FeO → Fe [6]. Doping with platinum in one step (sample FE-1) significantly increases the reduction of α-Fe2O3, two reduction maxima at 421 and 629 °C integrate a broad maximum at 360 °C, and a new small and very broad reduction maximum at 146 °C can be attributed to Pt 4+ reduction in Pt 0 and partial Fe 3+ reduction ions bound in Fe-O-Pt groups.…”

“…Liu et al [4] used the co-precipitation method to disperse Pt on FeO x support, while Li et al [5] used the colloidal deposition method to prepare Pt/Fe 2 O 3 catalysts for low-temperature oxidation CO to CO 2 at room temperature. Li et al [6] investigated the redispersion behavior of Pt on the surface of Fe 2 O 3 . They found that Pt can be effectively redispersed on the surface of Fe 2 O 3 when it is alternately treated with oxidative and reductive atmosphere.…”