Structural properties of an unsupported model Pt–Sn catalyst and its catalytic properties in cyclohexene transformation

Cover Picture: Highly Selective and Immortal Magnesium Calixarene Complexes for the Ring‐Opening Polymerization of rac‐Lactide (ChemCatChem 7/2014)

“…For the ligand‐free bimetallic nanoparticles, the average value obtained for the domain size is only 1.3±0.2 nm, which is significantly smaller than the particle size observed by using TEM. This observation supports the assumption that the particles consist of a highly crystalline core with a certain amount of Sn incorporated into the lattice and a more disordered, Sn‐enriched shell, which is in agreement with previous studies on PtSn nanoparticles 15. 16…”

Controlled Synthesis of Pt3Sn/C Electrocatalysts with Exclusive Sn–Pt Interaction Designed for Use in Direct Methanol Fuel Cells

“…The influence of the T red on the type of Sn-Pt alloys was demonstrated in Ref. [54]. It was shown that reduction of unsupported PtSn powder with a nominal Pt/Sn= 3 ratio at 200°C…”

Dehydroaromatization of methane over Sn–Pt modified Mo/H-ZSM-5 zeolite catalysts: Effect of preparation method

“…The spectrum recorded after reducing the sample at 200 o C showed only broad bands (at 2162 and 2130 cm -1 ) due to gaseous CO indicating the absence of platinum surface atoms. This could be attributed to the formation of tin and molybdenum oxide layer over the surface of the platinum atoms which blocked access of CO molecules to platinum atoms [52,56]. The formation of PtSn alloys will also decrease the platinum affinity for CO [57,58].…”

“…Arteaga et al [49] reported that during the reduction of tin modified platinum catalysts, partially reduced tin oxide species tends to spread over the surface of the catalyst and covers the surface platinum atoms. Another reason might be that during reduction, migration of tin took place leading to the formation of a mixed oxide layer that covered the surface platinum atoms (or Pt-Sn alloys) resulting in the platinum not being accessible to CO [52]. between platinum and CO is 1.…”