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Citation: Chenglong Zou, Guanyu Sha, Yao Huang, Guoxing Niu, Dongyuan Zhao. Incorporation of Al3+ ions to promote the stabilization effect of (NH4)2SiF6 treatment on the hydrothermal stability of mesoporous SBA-15 zeolite[J]. Chinese Journal of Catalysis, ;2015, 36(7): 1001-1008. doi: 10.1016/S1872-2067(15)60855-5 shu

Incorporation of Al3+ ions to promote the stabilization effect of (NH4)2SiF6 treatment on the hydrothermal stability of mesoporous SBA-15 zeolite

  • 1.

    a Department of Chemistry, Fudan University, Shanghai 200433, China;

  • Corresponding author: Guoxing Niu, 
  • Received Date: 8 February 2015
    Available Online: 25 March 2015

    Fund Project: 国家重点基础研究发展计划(973计划, 2010CB226901, 2013CB934100) (973计划, 2010CB226901, 2013CB934100) 国家自然科学基金(U1463206). (U1463206)

  • This work demonstrates an improved (NH4)2SiF6 treatment to enhance the hydrothermal stability of mesoporous SBA-15 zeolite. In this treatment, Al3+ ions are incorporated into SBA-15 zeolite first, then it is treated with 5% (NH4)2SiF6 solution according to 1% SiO2 of SBA-15 and finally washed with HCl (2 mol/L) to remove the pre-incorporated Al3+ ions. The obtained SBA-15 exhibits higher hydrothermal stability than that without pre-incorporated Al3+. Compared with the latter, the sample maintains a better ordered mesostructure and a larger surface area (271 m2/g) after hydrothermal treatment at 800 ℃ for 12 h in 100% steam. The results show that incorporating Al3+ ions into SBA-15 zeolite before (NH4)2SiF6 treatment obviously promotes the stabilization effect of (NH4)2SiF6 treatment. The mechanism suggests that the incorporated Al3+ ions can effectively capture F- ions that have been released from (NH4)2SiF6, and thus reduce their etching into the SBA-15 zeolite framework. This ensures that the positive factors of (NH4)2SiF6 treatment, such as silicon insertion and surface hydrophobization by F- ions, play effective roles in the improvement of the hydrothermal stability of SBA-15 zeolite. This promoting effect of the Al3+ ions is closely related to the method that is used to introduce the Al3+ and the SBA-15 zeolite processing temperature.
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