Abstract
A modified solvent-free method has been developed to synthesize FeAPO-5 zeolite catalysts with hierarchical porous structure as well as high crystallinity and iron content. The effects of mechanochemical and low-temperature pretreatment, as well as the addition of hydrogen peroxide and seed crystals on the synthesis of FeAPO-5 were studied in detail. The composition and structural features of relatively pure resultant products were deeply analyzed by XRD, SEM, ICP-AES, CHN analysis, TG–DTA, UV–Vis diffuse reflectance spectroscopy and N2 physisorption. Most importantly, low-temperature pretreatment towards H2O2-containing precursor mixtures can to a great degree improve the crystallinity of FeAPO-5 molecular sieve. Significantly, compared to the conventional micron-sized microporous FeAPO-5 zeolite, the hierarchical FeAPO-5 catalysts created by this modified solvent-free method show superior performance in phenol hydroxylation, in which the one with a high content of framework iron species exhibits the best catalytic performance, giving phenol conversion of about 40% and dihydroxybenzene selectivity of up to 80% at 50 °C within 3 h reaction time.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (Grant No. 21306072 and 21666019) and the Natural Science Foundation of Gansu Province, China (Grant No. 17JR5RA124). We cordially thank the Reviewers and Editors for providing us with valuable comments and suggestions.
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Zhao, X., Duan, W., Zhang, X. et al. Insights into the effects of modifying factors on the solvent-free synthesis of FeAPO-5 catalysts towards phenol hydroxylation. Reac Kinet Mech Cat 125, 1055–1070 (2018). https://doi.org/10.1007/s11144-018-1465-2
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DOI: https://doi.org/10.1007/s11144-018-1465-2