In situprobing of Pt/TiO₂activity in low-temperature ammonia oxidation

Abstract

NAP-XPS and operando XAS study of Pt/TiO2 catalysts shows that Pt0 species stabilized on TiO2 surface have the highest activity at low-temperature NH3 oxidation.

Visible Light-Mediated Sustainable Antibacterial Activity and Osteogenic Functionality of Au and Pt Multi-Coated TiO2 Nanotubes

“…This phenomenon is related to the amount of Pt deposited directly on the TiO 2 nanotubes. Because Pt sputtering time was short (30 s), the small amounts of Pt nanoparticles were coated on the surface of the TiO 2 nanotubes (Figure 1), and these nanoparticles are likely to be easily oxidized to form PtO X structures [28,29]. Thus, the new binding peak (~72.5 eV) was expected to be the Pt-O bond generated by binding Pt metals to the TiO 2 nanotubes in a short time.…”

“…Moreover, a new peak at 72.5 eV was detected in the Pt 4f spectra of the PtAu30. This peak seemed to be the formation of Pt-O bonds when a small amount of Pt was first coated at the surface of the TiO 2 nanotubes [28,29].…”

Ru-Based Catalysts for Ammonia Decomposition: A Mini-Review

“…For example, intermediate formation and/or dynamic electron donation can be better investigated by in situ XPS characterization. The catalytic mechanism of ammonia oxidation over Pt catalysts was studied via in situ XPS by Boronin et al 106 and Nieuwenhuys et al 107 They observed dehydrogenation intermediates (NH x , x = 0, 1, 2) and changes of active sites. It is envisaged that similar information (e.g., detection of NH 2ad , NH ad , and N ad ) could be obtained by using in situ XPS in the investigation of catalytic ammonia decomposition.…”

“…For example, intermediate formation and/or dynamic electron donation can be better investigated by in situ XPS characterization. The catalytic mechanism of ammonia oxidation over Pt catalysts was studied via in situ XPS by Boronin et al and Nieuwenhuys et al . They observed dehydrogenation intermediates (NH x , x = 0, 1, 2) and changes of active sites.…”

Progress on Noble Metal-Based Catalysts Dedicated to the Selective Catalytic Ammonia Oxidation into Nitrogen and Water Vapor (NH3-SCO)

“…Nevertheless, under reaction conditions, at least 40% of Pt surface remains oxidized resulting in the formation of N 2 O [29]. Otherwise, the metal-support interactions of Pt/TiO 2 were reported to stabilize Pt in the metallic state (also under reaction conditions) [30]. The Pt 0 content can also be manipulated by preparation procedure of Pt/SiO 2 -Al 2 O 3 , i.e., by adding ascorbic acid (vitamin C, vC; n(vC)/n(Pt) = 0.25-1.5) [31].…”