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Synthesis, characterization and catalytic properties of mesoporous MCM-48 containing zeolite secondary building units

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Abstract

Mesoporous aluminosilicate MCM-48 containing zeolite secondary building units in the pore wall has been synthesized in alkaline media with a two-step procedure. The aluminosilicate precursors comprising zeolite secondary building units were first synthesized by carefully controlling reaction conditions and then were assembled using co-templates of gemini surfactant [C18H37N(CH3)2(CH2)3-N(CH3)2C18H37]2+ (18-3-18) and triethanolamine (TEA). X-ray Diffraction (XRD) patterns of the as-made samples indicated that highly ordered mesostructured MCM-48 was formed. Transmission Electron Microscopy (TEM) images further verified the formation of MCM-48 with uniform cubic pore channel system having the pore opening diameter of about 25 Å. Compared with the conventionally synthesized MCM-48, the as-synthesized MCM-48 sample showed an adsorption band at 520–600 cm−1 in its FT-IR spectrum, which was assigned to five-membered ring vibration from zeolite structure. This suggested the presence of zeolite building units in the pore wall. N2 adsorption data showed that the material had a much higher specific surface area (1 200 m2/g) than the conventional MCM-48(1 100 m2/g). Finally, the catalytic performance of the as-made MCM-48 was evaluated by hydrogenation dealkylation reaction of heavy aromatic hydrocarbons. Catalytic results showed that the as-made MCM-48 catalyst exhibited higher conversion than the conventional MCM-48 catalyst. The as-made mesostructured MCM-48 may have a potential catalytic application in the conversion of bulky molecules.

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Authors and Affiliations

  1. The CNPC Key Laboratory of Catalysis, China University of Petroleum, Beijing, 102249, China

    Li Qiang, Dou Tao & Zhang Ying

  2. Institute of Special Chemicals, Taiyuan University of Technology, Taiyuan, 030024, China

    Dou Tao, Li Yuping & Wang Shan

  3. Institute of Daqing Petro Chemical, Daqing, 163714, China

    Sun Famin

Authors
  1. Li Qiang
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  2. Dou Tao
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  3. Zhang Ying
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  4. Li Yuping
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  5. Wang Shan
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  6. Sun Famin
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Correspondence to Dou Tao.

Additional information

Translated from Journal of Fuel Chemistry and Technology, 2006, 34(1): 105–108 [译自: 燃料化学学报]

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Li, Q., Dou, T., Zhang, Y. et al. Synthesis, characterization and catalytic properties of mesoporous MCM-48 containing zeolite secondary building units. Front. Chem. Eng. China 1, 1–5 (2007). https://doi.org/10.1007/s11705-007-0001-0

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  • DOI: https://doi.org/10.1007/s11705-007-0001-0

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