Evidence for H₂-Induced Ductility in a Pt/Al₂O₃ Catalyst

Stability of Pt10Sn3 Clusters Supported on γ‐Al2O3 in Oxidizing Environment: a DFT Comparison of Alloying and Size Effects

“…In comparison with the Pt 3 Sn (111) surface, [24] the supported Pt 10 Sn 3 cluster exhibits stronger adsorption energy which shows a huge capacity of stabilizing oxygen atoms on it. This is due to the intrinsic metastability of such small size clusters with respect to infinite surface, and also to the capacity of these small clusters to adapt their shape upon adsorption, a consequence of their ductility, as previously shown for H adsorption on Pt [40,41] and PtSn clusters [19] . Notably, starting from n=10, the structure of the support is locally affected, with the migration of a surface Al atom to a neighboring Al IV position close to the surface.…”

Neutron Scattering Studies of Heterogeneous Catalysis

“…INS is a relatively insensitive technique, so to maximize the signal, either Pt black or high metal loading (40–60 wt % Pt) supported catalysts have been used. Improvements in instrumentation mean that 5 wt % Pt catalysts can now be studied. − Remarkably, it is possible to observe both the expected Pt–H modes and molecular hydrogen physisorbed to Pt–hydride species …”

Tuning product selectivity of CO2 hydrogenation by OH groups on Pt/γ‐AlOOH and Pt/γ‐Al2O3 catalysts

“…Hydroxyl (OH) is one of the most common functional groups on heterogeneous catalysts, for example, Pt/γ‐AlOOH and Pt/γ‐Al 2 O 3 1–4 . It is formed in both catalyst preparation and reaction processes.…”

“…ever, the exact roles of OH groups in heterogeneous catalytic reactions are still controversial. [1][2][3][4][5][6][7][8][9][10] Some studies implied that the catalyst's OH groups promoted reactant adsorption on catalysts to improve reactant conversion, whereas some studies suggested that OH groups occupied active sites of catalysts to prevent reactant conversion. [4][5][6][7][8][9][10] Moreover, most of the previous works explored the influence of catalyst's OH groups on heterogeneous catalytic reactions as a whole, and the exact roles of OH groups at different sites of catalysts in heterogeneous catalytic reactions have not been well distinguished yet.…”