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首页> 外文期刊>Applied Catalysis, A. General: An International Journal Devoted to Catalytic Science and Its Applications >Avoiding the deactivation of sulphated MoOx/TiO2 catalysts in the photocatalytic cyclohexane oxidative dehydrogenation by a fluidized bed photoreactor
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Avoiding the deactivation of sulphated MoOx/TiO2 catalysts in the photocatalytic cyclohexane oxidative dehydrogenation by a fluidized bed photoreactor

机译：避免流化床光反应器在光催化环己烷氧化脱氢中使硫酸化的MoOx / TiO2催化剂失活

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摘要

Since the relevance of deactivation phenomena in heterogeneous gas-solid photocatalytic processes, a study on the deactivation of MoO_x/TiO2 catalysts in the oxidative photodehydrogertation of cyclohexane has been carried out in a fixed bed reactor and compared to the behaviour of catalysts used in a two-dimensional fluidized bed photoreactor. Superior photocatalytic performances were obtained in the fluidized bed reactor with respect to the fixed bed reactor both in terms of cyclohexane conversion and benzene yield. At the opposite of the fixed bed, in the fluidized bed reactor, catalyst did not deactivate. Characterization performed on catalysts after photocatalytic tests evidenced that the deactivation of the catalysts is correlated to the accumulation of carbonaceous species on catalyst surface and the sulphur disappearance. The catalysts used in fluidized conditions remained active as they maintained their initial sulphur content at the surface.
机译：由于在非均相气固光催化过程中失活现象的相关性，已经在固定床反应器中对环己烷的氧化光脱氢萌发过程中的MoO_x / TiO2催化剂的失活进行了研究，并将其与两种方法中使用的催化剂的行为进行了比较。维流化床光反应器。就环己烷转化率和苯产率而言，在流化床反应器中相对于固定床反应器均具有优异的光催化性能。在固定床的对面，在流化床反应器中，催化剂没有失活。在光催化试验后对催化剂进行的表征证明，催化剂的失活与催化剂表面含碳物质的积累和硫的消失有关。在流化条件下使用的催化剂保持活性，因为它们在表面保持了初始硫含量。

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