High promoting of selective oxidation of ethylbenzene by Mn-ZSM-5 synthesized without organic template and calcination

Abstract

Acetophenone is a valuable and widely applied intermediate in chemical industry, but limited by the synthesis with low-cost and efficient heterogeneous catalyst. Herein, we report tetrahedral coordination manganese-incorporated ZSM-5 zeolite (Mn-ZSM-5) by three steps involving acid hydrolysis of Mn(NO3)2 with tetraethylorthosilicate, basic aging and hydrothermal crystallization without organic template and calcination. Mn-ZSM-5 was identified by characterizations such as X-ray diffraction, Fourier transform infrared spectra (FTIR), field emission scanning electron microscopy, inductively coupling plasma spectrometer, N2-adsorption/desorption and FTIR, X-ray photoelectron spectroscopy (XPS), electron spin-resonance spectroscopy (ESR), NH3-TPD and H2-TPR. Moreover, tetrahedral coordination Mn atoms successfully incorporate into the framework of ZSM-5 demonstrated by ESR and XPS spectra. Furthermore, Mn-ZSM-5 with high crystallinity performs high and stable catalytic activity in the oxidation of ethylbenzene owing to tetrahedral Mn3+ in the framework of ZSM-5 as catalytic active sites. Tetrahedral coordination manganese-incorporated ZSM-5 zeolites synthesized without organic template and calcination performed high and stable catalytic activity on the oxidation of ethylbenzene owing to tetrahedral Mn3+ as catalytic active sites.