Adsorption Studies on Vanadium Oxides. A Verification of the Oxidized Surface State Model

摘要: The adsorption of benzene, toluene, pyridine and 3-methyl-pyridine on V 2 0 5 , 6 ,0 13 4 was measured at 250° C. purpose the studies to verify so-called oxidized surface state model (A. Andersson, J. Solid State Chem., 42 (1982) 263). In comparison other hydrocarbons benzene showed almost no adsorption, indicating absence a strong coordination ring vanadium ions. By using bond strength concept in combination with crystallographic considerations, it is concluded that amount toluene adsorbed 250-350°C can be considered measure V=0 bonds. At C found coordinated preferentially partially reduced use compounds both single combined modes permits certain geometric conclusions drawn. It bonds are located (010) plane, while ions (100) plane. Adsorption measurements show possible, basis values, draw distinction between various oxygen species. Oxygen anions having value ∑s ≥1.40 methyl carbon atoms after abstraction hydrogen. (001) plane expose such species high concentration, some them relatively weakly bound. adsorb Bronsted bases, but did not atoms. demonstrated results obtained fit proposed very well, great potential for calculations.