E. Dziluma, S. Giller, V. Slavinska
1976
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Journal
Studies in Surface Science and Catalysis
Abstract
Summary The activity of supported multicomponent vanadium-molybdenum-phosphoric catalysts and vanadium catalysts promoted by silver oxide has been studied in the processes of oxidation and oxidative ammonolysis of furan compounds, cyclopentadiene and alkylbenzenes. High catalytic activity is characteristic not only for solid solution of molybdenum trioxide in vanadium pentoxide (MoO 3 /V 2 O 5 = 0.25) but also for the systems where MoO 3 /V 2 O 5 ratio is 1+2. Nickel, cobalt, silver, cadmium, as well as rare and rare-earth elements (thallium, cerium et al.) have been demonstrated to exert promoting activity on vanadium-molybdenum-phosphoric catalysts. As dependent on the silver content vanadium oxide catalysts have been demonstrated to contain polyvanadate AgV 7 O 18 and vanadium bronze AgV 6 O 15 . Large differences on the structure and dispersity of vanadium oxide catalysts prepared in the media of hydrochloric acid and ammonia have been found. The influence of temperature and other conditions on the stage of evaporation on their structure and activity has been evaluated.