Abstract
HZSM-5-supported phosphotungstic acid (PW) has been prepared and characterized. The results indicate that 5 wt% PW/HZSM-5 calcined at 773 K has the largest surface area and high dispersion of PW. It was confirmed that Keggin units are present inside the catalyst and that the proton of PW and the silanol of HZSM-5 interact via bridging structure. The catalytic properties of PW/HZSM-5 in the regioselective nitration of naphthalene to dinitronaphthalene were investigated. The best results, i.e. 48.5 % yield of 1,5-dinitronaphthalene, 49.2 % yield of 1,8-dinitronaphthalene, and the highest ratio of 1,5-dinitronaphthalene to 1,8-dinitronaphthalene, were obtained by use of 5 wt% PW/HZSM-5.
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Acknowledgments
This work was supported by the Program for New Century Excellent Talents in University (NCET-10-0168), the National Natural Science Foundation of China (21276218), the Specialized Research Fund for the Doctoral Program of Higher Education (20124301110007), the Scientific Research Fund of Hunan provincial Education Department (13K043), and the Project of Hunan provincial Science and Technology Department (2012FJ1001).
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Liu, P., Xiong, W., Wang, X. et al. Regioselective nitration of naphthalene over HZSM-5-supported phosphotungstic acid. Res Chem Intermed 41, 4533–4543 (2015). https://doi.org/10.1007/s11164-014-1549-1
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DOI: https://doi.org/10.1007/s11164-014-1549-1