Evolution Of Strong Second

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The first product formed upon interaction of CO with the surface of fully dehydroxylated MgO is CO2–2. This species is generated by nucleophilic attack of a surface O2– on CO weakly σ-bonded on an Mg2+ cation in an adjacent position. The CO2–2 species generates C3O2–4 by addition of 2 CO molecules. Trimeric species (and unreacted CO2–2) are the most abundant components at 77 K. Further addition of CO molecules at room temperature generates oxygen-sensitive C2nO2–(2n+ 1) species which have an open structure and are responsible for the pink colour of the sample. Long exposure at room temperature, and moderate increase of temperature, favour disproportionation reactions, leading to adsorbed CO2(CO2–3) and C.

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J. Chem. Soc., Faraday Trans.

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, 1990,86, 703-709
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Revisiting MgO–CO surface chemistry: an IR investigation

A. Zecchina, S. Coluccia, G. Spoto, D. Scarano and L. Marchese, J. Chem. Soc., Faraday Trans., 1990,86, 703 DOI: 10.1039/FT9908600703

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Adriano Zecchina
Salvatore Coluccia
Giuseppe Spoto
Domenica Scarano
Leonardo Marchese

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