FTIR study of low-temperature CO adsorption on high surface area tin(iv) oxide: Probing Lewis and Brønsted acidity
文献信息
Patrick Gélin, Laurent Périer-Camby, Hélène Praliaud, Gérard Thomas
The Lewis and Brønsted acidic properties of the surface sites of a high surface area tin(IV) oxide sample were investigated by the CO adsorption at low temperature using IR spectroscopy. Two distinct cus (coordinatively unsaturated sites) Sn4+ cation sites having different Lewis acidic strength have been evidenced: (i) Sn4+I strongly bonding CO (νCO = 2210–2196 cm−1), (ii) Sn4+II (νCO = 2183–2177 cm−1), being less acidic. Several types of OH groups have been also evidenced: (i) OH occluded in the bulk and inaccessible to CO (νOH = 3445–3435 cm−1), (ii) non-acidic OH groups (νOH = 3740–3725 and 3660 cm−1) which give rise to a νCO band at 2155 cm−1 and νOH bands respectively at 3640 and 3570 cm−1 (ΔνOH = 90 cm−1) as CO adsorption occurs, (iii) slightly Brønsted acidic OH groups (νOH = 3625 cm−1) which lead to a νCO band at 2164 cm−1 and a νOH band at 3740 cm−1 (ΔνOH = 155 cm−1). Depending on the treatment in vacuum (at room temperature or at 773 K) prior to CO adsorption, the populations of these different sites may vary. An outgassing in vacuum at 773 K leads to the partial dehydroxylation of the SnO2 surface, increasing the number of Sn4+ Lewis acidic sites.
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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.












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