Chinese Journal of Catalysis ›› 2018, Vol. 39 ›› Issue (5): 955-963.DOI: 10.1016/S1872-2067(17)63007-9

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Enhancement of catalytic activity by homo-dispersing S2O82--Fe2O3 nanoparticles on SBA-15 through ultrasonic adsorption

Qingyan Chua,b, Jing Chena, Wenhua Houc, Haoxuan Yud, Ping Wanga,d, Rui Liua, Guangliang Songa, Hongjun Zhua, Pingping Zhaod   

  1. a College of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 211816, Jiangsu, China;
    b Research institute of QILU petrochemical company, SINOPEC, Zibo 255400, Shandong, China;
    c Key Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, Jiangsu, China;
    d School of Chemical Engineering, Shandong University of Technology, Zibo 255049, Shandong, China
  • Received:2017-11-23 Revised:2017-12-29 Online:2018-05-18 Published:2018-04-19
  • Contact: 10.1016/S1872-2067(17)63007-9
  • Supported by:

    This work was supported by the National Key Research and Development Program of China (2016YFB0301703), the Joint Innovation and Research Funding-prospective Joint Research Projects (BY2016005-06), and the National Natural Science Foundation of China (21506118).

Abstract:

Mesoporous superacids S2O82--Fe2O3/SBA-15 (SFS) with active nanoparticles are prepared by ultrasonic adsorption method. This method is adopted to ensure a homo-dispersed nanoparticle active phase, large specific surface area and many acidic sites. Compared with bulk S2O82--Fe2O3, Brönsted acid catalysts and other reported catalysts, SFS with an Fe2O3 loading of 30% (SFS-30) exhibits an outstanding activity in the probe reaction of alcoholysis of styrene oxide by methanol with 100% yield. Moreover, SFS-30 also shows a more excellent catalytic performance than bulk S2O82--Fe2O3 towards the alcoholysis of other ROHs (R=C2H5-C4H9). Lewis and Brönsted acid sites on the SFS-30 surfaces are confirmed by pyridine adsorbed infrared spectra. The highly efficient catalytic activity of SFS-30 may be attributed to the synergistic effect from the nano-effect of S2O82--Fe2O3 nanoparticles and the mesostructure of SBA-15. Finally, SFS-30 shows a good catalytic reusability, providing an 84.1% yield after seven catalytic cycles.

Key words: Mesoporous superacid, Nanoparticle, Nano effect, S2O82--Fe2O3/SBA-15, Acidic site, Ultrasonic adsorption, Alcoholysis