A study has been made of the production of maleic acid by oxidation of benzene using various catalyst combinations supported on different materials with addition of various amounts of cobalt oxides as promoter. Best yields of maleic acid (50% conversion of benzene) were obtained with a vanadium pentoxide‐molybdenum trioxide (1–2.3:1) catalyst supported on kieselguhr with 5% of cobalt oxide as promoter. The method of preparation of the metal oxides and of pretreatment of the support affected the results.
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Bhattacharyya et al. (1958) studied this question.
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