Mechanism of Coke Influence on the Catalytic Activity of FeZSM-5 in the Reaction of Benzene Oxidation into Phenol |
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Authors: | D P Ivanov M A Rodkin K A Dubkov A S Kharitonov G I Panov |
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Institution: | (1) Boreskov Institute of Catalysis, Siberian Division, Russian Academy of Sciences, Novosibirsk, 630090, Russia;(2) Solutia Inc., Gonzales, Florida, USA |
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Abstract: | The influence of coke formation in the reaction of benzene oxidation by nitrous oxide into phenol on the catalytic activity and concentration of iron-containing active sites (-sites), which are stabilized in the microporous structure of FeZSM-5 zeolite, is studied. The deactivation by coke is explained by the poisoning of -sites, whose concentration decreases linearly with an increase in the coke content, rather than by the blocking of zeolite pores. The activity per one -site remains unchanged. This fact indicates the absence of diffusion limitations associated with coke formation. The toxicity of coke for the -sites is determined. The coke amount equivalent to 100–120 benzene molecules is shown to result in the deactivation of one active site. |
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