Abstract
(Rh + Nb)/SiO2 catalysts were obtained by anchoring of nanometer size Rh particles on surface low-valent Nbn + ions. These materials exhibit the following specific features compared to Rh/SiO2: a low Rh surface coverage by chemisorbed hydrogen and carbon oxide; a high-frequency shift of linear CO absorption band and appearance of two absorption bands of a C- and O-bonded CO at 1704 and 1652 cm−1. On exposure to H2, the stability of surface carbonyls increases in the sequence: Rh-CO-Nbn + < Rh-CO ≤ Rh2(CO) < Rh+(CO)2. The possible role of C- and O-bonded CO complexes in the conversion of syngas on supported rhodium catalysts promoted by transition element oxides is discussed.
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