Oxidative Dehydrogenation of Ethylbenzene over ZSM-5 Type Chromosilicates in the Presence of CO2Reportar como inadecuado




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In this work, ZSM-5type chromosilicate samples as KCrZSM-5KCS and NaCrZSM-5NCS were preparedby hydrothermal method and their catalytic properties were investigated for theoxidative dehydrogenation of ethylbenzene in the presence of CO2 asan oxidant using a fixed-bed stainless steel reactor. The prepared samples werecharacterized by their morphology SEM, structural parameters XRD, andtextural parameters BET. The performance of these catalysts was evaluated interms of conversion, styrene yield, and selectivity. The KCSBW catalyst potassium chromosilicate before washing with distilled waterafforded the highest styrene yield, 56.19%, with the selectivity of 96.05% inthe presence of CO2 because of the coexistence of potassium ion andCr2O3 in its structure and their synergistic effect. Theinfluence of the presence of Cr2O3 and sodium orpotassium ion on the catalytic activity of the chromosilicate samples in thecatalytic EB dehydrogenation process was discussed in detail. Moreover, accordingto the results, the catalytic activity of the chromosilicate samples CS in EBdehydrogenation was increased by decreasing the surface area.

KEYWORDS

Chromosilicate, Styrene, Ethylbenzene, Dehydrogenation, Chromium Oxide

Cite this paper

Sadeghi, E. , Oskoui, M. , Khatamian, M. and Ghassemi, A. 2016 Oxidative Dehydrogenation of Ethylbenzene over ZSM-5 Type Chromosilicates in the Presence of CO2. Modern Research in Catalysis, 5, 75-84. doi: 10.4236-mrc.2016.53007.





Autor: Ebrahim Sadeghi1,2, Maryam Saket Oskoui1, Maasoume Khatamian1*, Abdolhossein H. Ghassemi3

Fuente: http://www.scirp.org/



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