Effects of Potassium on Carbon Monoxide Methanation over Supported Rhodium Films

Article abstract of DOI:10.1021/j100409a001

The reaction of hydrogen with carbon monoxide over Rh/Al2O3 and Rh/TiO2 catalytic films, some of which contained potassium as an additive, has been investigated.The presence of potassium caused the usual gem dicarbonyl and linear CO species on supported rhodium to disappear at lower temperature than for catalysts containing no potassium.On the other hand, the bridged carbonyl species seemed to be significantly enhanced by the presence of potassium.The Rh/TiO2 films to which potassium was added catalyzed the production of significant amounts of acetone and acetaldehyde as oxygeneted products.It is likely that bridged carbonyl species is the precursor to oxygenated products.