Effect of surface and bulk palladium doping on the catalytic activity of La2Sn2O7 pyrochlore oxides for diesel soot oxidation

Elucidating Ru Distribution State of Ru‐Promoted Pr2Sn2O7 Pyrochlore and its Effect on the Catalytic Performance for Toluene Deep Oxidation

“…In contrast, this peak moves obviously to lower temperature region for all the Ru‐modified samples. This shift is believed to due to the hydrogen spillover effect on metallic Ru that forms first during the reduction [8a] . In comparison with the two substituted Ru−Pr 2 Sn 2 O 7 catalysts, the peak shift of the two impregnated Ru/Pr 2 Sn 2 O 7 catalysts is more evident, testifying indirectly that Ru disperses mainly on the surface of Pr 2 Sn 2 O 7 , well consistent with the HRTEM results.…”

“…XPS was used to explore the surface features and compositions of the samples. Figure S4a depicts that the samples possess a doublet Sn 3d peaks around 494 and 485 eV, which are assignable to Sn 3d 3/2 and Sn 3d 5/2 of Sn 4+ [8a,15] . Figure S4b demonstrates that the samples possess a doublet Pr 3d peaks around 954 and 933 eV, which are attributable to Pr 3d 3/2 and Pr 3d 5/2 of Pr 3+ [16] .…”

“…This indicates that the Ru/RuO 2 is either highly dispersed on the Pr 2 Sn 2 O 7 support for the impregnated catalysts, or doped into the matrix of the pyrochlore structure for the hydrothermal catalysts, thus escaping the detecting by XRD. Although all the metal precursors are taken according to the stoichiometric amount for sample preparation, a residual amount of SnO 2 is detected due to the incomplete reaction limited by equilibrium [8a,9c] . In all the samples, Pr 2 Sn 2 O 7 pyrochlore is the predominant crystal phase.…”

Highly Active and CO-Tolerant Trimetallic NiPtPd Hollow Nanocrystals as Electrocatalysts for Methanol Electro-oxidation Reaction

“…Moreover, the NiPd-HNCs sample shows a negative reduction peak of the hydrogen spillover at 70 °C, which can be assigned to the decomposition of β-PdH x , further revealing the Pd(0) domination of the NiPd-HNCs surface (Figure S6). 61,62 The apparent reduction peaks located in regions II and III were attributed to the stepwise reduction of NiO species. 60 By comparing the NiPtPd-HNCs with PtPd-HNCs, a shoulder can be observed at 208 °C for NiPtPd-HNCs which was inconspicuous for PtPd-HNCs, probably due to the replacement of Ni by Pd atoms on the surface of PtPd-HNCs.…”

Stable CuO/La2Sn2O7 catalysts for soot combustion: Study on the monolayer dispersion behavior of CuO over a La2Sn2O7 pyrochlore support

“…A2B2O7 pyrochlore compounds are important functional materials that have been applied in gas sensors [30], ferroelectric materials [31], and catalysts [32,33]. In particular, these compounds possess excellent thermal stability and excellent oxygen anion conductivity, which are vital features of redox catalysts for exothermic processes [34,35].…”