Highly selective production of phenol from benzene over mesoporous silica-supported chromium catalyst: Role of response surface methodology in optimization of operating variables

doi:10.1016/S1872-2067(15)60898-1

Abstract

Abstract:

A Cr/SBA-16 catalyst was prepared using Cr(NO₃)₃ as a precursor and mesoporous silica SBA-16 as a support via a simple impregnation method. The catalyst was characterized using wide-angle X-ray diffraction (XRD), low-angle XRD, N₂ adsorption-desorption, transmission electron microscopy, and ultraviolet-visible spectroscopy. The catalyst activity was investigated in the direct hydroxylation of benzene to phenol using H₂O₂ as the oxidant. Various operating variables, namely reaction temperature, reaction time, amount of H₂O₂, and catalyst dosage, were optimized using central composite design combined with response surface methodology (RSM). The results showed that the correlation between the independent parameters and phenol yield was represented by a second-order polynomial model. The high correlation coefficient (R²), i.e., 0.985, showed that the data predicted using RSM were in good agreement with the experimental results. The optimization results also showed that high selectivity for phenol was achieved at the optimized values of the operating variables: reaction temperature 324 K, reaction time 8 h, H₂O₂ content 3.28 mL, and catalyst dosage 0.09 g. This study showed that RSM was a reliable method for optimizing process variables for benzene hydroxylation to phenol.

Key words: Mesoporous silica, Chromium/SBA-16 catalyst, Benzene hydroxylation, Phenol, Response surface methodology

Milad Jourshabani, Alireza Badiei, Negar Lashgari, Ghodsi Mohammadi Ziarani. Highly selective production of phenol from benzene over mesoporous silica-supported chromium catalyst: Role of response surface methodology in optimization of operating variables[J]. Chinese Journal of Catalysis, 2015, 36(11): 2020-2029.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(15)60898-1

https://www.cjcatal.com/EN/Y2015/V36/I11/2020

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