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Synthesis, characterization and catalytic application of mesoporous molecular sieves SBA-15 functionalized with phosphoric acid

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Abstract

The phosphoric acid groups has been successfully grafted on the surface of mesoporous molecular sieve SBA-15 to form a solid acid catalyst P-SBA-15 by post-synthesis method. The samples were characterized by means of XRD, FT-IR, SEM, TEM, 31P MAS NMR, NH3-TPD, N2 adsorption/desorption and the esterification reaction. The XRD and N2 adsorption/desorption results indicate that P-SBA-15 catalyst keeps the 2D hexagonal mesoporous structure and opens channels with the lower surface area of 554.35 m2/g compared with that of SBA-15. The SEM and TEM results show that the figuration of P-SBA-15 behaves “rod-like” and phosphoric acid groups is scattered differently on the surface of P-SBA-15. The FT-IR and 31P MAS NMR results display that phosphorus species graft onto the surface of SBA-15, which provide the Brønsted acid sites on the surface of P-SBA-15. The acidity of the generated Brønsted acid sites on P-SBA-15 significantly is verified by NH3-TPD. The esterification reaction results shows that catalytic activity of P-SBA-15 is enhanced significantly compared with that of SBA-15, and its stability is good.

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Acknowledgments

This work was supported by a Grant-in-aid for Scientific Research from the Japan Society for the Promotion of Science (JSPS) and the CREST program of the Japan Science and Technology Agency (JST). We are grateful to young and middle aged academic leaders of Jiangsu Province universities’ “blue and green blue project”. This work is also supported by National Natural Science Foundation of China (Grant No. 50873042).

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Authors and Affiliations

  1. Department of Chemical Engineering, Huaihai Institute of Technology, Lianyungang, 222005, Jiangsu, People’s Republic of China

    Baoping Wu & Zhiwei Tong

  2. School of Petrochemical Engineering, Liaoning University of Petroleum and Chemical Technology, Fushun, 113001, Liaoning, People’s Republic of China

    Xingdong Yuan

Authors
  1. Baoping Wu
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  2. Zhiwei Tong
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  3. Xingdong Yuan
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Correspondence to Baoping Wu.

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Wu, B., Tong, Z. & Yuan, X. Synthesis, characterization and catalytic application of mesoporous molecular sieves SBA-15 functionalized with phosphoric acid. J Porous Mater 19, 641–647 (2012). https://doi.org/10.1007/s10934-011-9515-4

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