Abstract
The concept of very strong metal–support interactions (VSMSI) was defined in regard to the interactions that influence the catalytic properties of catalysts due to the creation of a new phase as a result of a solid-state chemical reaction between the metal and support. In this context, the high catalytic activity of the 1%Pt/Al2O3 catalyst in the CO oxidation reaction at room temperature was explained. The catalyst samples were reduced at different temperatures ranging from 500 °C to 800 °C and characterized using TPR, O2/H2 titration, CO chemisorption, TPD-CO, FTIR-CO, XRD, and TOF-SIMS methods. Based on the obtained results, it was claimed that with very high temperature reduction (800 °C), nonstoichiometric platinum species [Pt(Cl)Ox] strongly anchored to Al2O3 surface are formed. These species act as the oxygen adsorption sites.
Highlights
IntroductionThe primary goal of depositing metal onto a support material is to obtain a system with a highly dispersed form of metal, which is well-stabilized on the support surface, ensuring high catalytic efficiency
The profiles reveal that the carbon monoxide oxidation over the Pt/Al2 O3 catalyst at room temperature (RT) occurred significantly only after its very high temperature reduction
It can be stated that the very high temperature reductions (VHTRs) process creates the conditions under which platinum atoms can be insulated from each other and in this way reduce the effects of CO-CO interactions
Summary
The primary goal of depositing metal onto a support material is to obtain a system with a highly dispersed form of metal, which is well-stabilized on the support surface, ensuring high catalytic efficiency These catalysts are of considerable importance for industry because they allow more effective and economic usage of the metals, especially very expensive noble metals. In the late 1970s, for the first time it was realized that interactions occur between the metal and support, whose strength depends on the nature and surface morphology of the support material, the type of metal, and the catalyst preparation conditions. Such interactions may influence both the activity and selectivity of the catalyst. The first well-described example of a catalyst showing these interactions, which were called strong metal–support interactions (SMSI), was Pt/TiO2 [1]
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