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Facile synthesis of 5A zeolite from attapulgite clay for adsorption of n-paraffins

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Abstract

5A zeolites were facilely synthesized from attapulgite clay and sodium aluminate precursors. The optimum synthesis condition for 4A zeolite (Na-form) were H2O/attapulgite ratio of 40:1 volume/mass, NaOH/attapulgite mass ratio of 2.35:1, the crystallization time was 4 h at 80–85 °C. The 4A zeolite was converted to related 5A zeolite (Ca-form) through ionic exchanges using calcium chloride solution with the Si/Al mole ratio of 1.3. SEM images demonstrated that as-synthesized 5A zeolites are ordered cubic crystals, average crystals length dimension is 1–2 μm. And the zeolites product had a specific surface area of 482 m2 g−1 and total pore volume of 0.274 cm3 g−1. The static adsorption experiments showed that the equilibrium adsorption capacities of n-decane and n-pentadecane on produced 5A zeolite were 0.253 and 0.510 g g−1, respectively. And the adsorption equilibrium time of n-decane and n-pentadecane on 5A zeolite were 45 and 60 min, respectively. The experimental adsorption data of n-decane and n-pentadecane on three zeolites could be properly fitted by the Langmuir–Freundlich isotherm model.

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Acknowledgments

We gratefully acknowledge the Natural Science Foundation of Jiangsu Province (Grant BK20130251) and the financial support from the National Natural Science Foundation of China (Grant 21201026).

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Authors and Affiliations

  1. Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, School of Petrochemical Engineering, Changzhou University, 1 Gehu Road, Changzhou, Jiangsu, 213164, People’s Republic of China

    Le Chen, Yue-Wei Wang, Ming-Yang He, Qun Chen & Zhi-Hui Zhang

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  1. Le Chen
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  2. Yue-Wei Wang
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  4. Qun Chen
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  5. Zhi-Hui Zhang
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Correspondence to Qun Chen or Zhi-Hui Zhang.

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Chen, L., Wang, YW., He, MY. et al. Facile synthesis of 5A zeolite from attapulgite clay for adsorption of n-paraffins. Adsorption 22, 309–314 (2016). https://doi.org/10.1007/s10450-016-9776-y

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  • DOI: https://doi.org/10.1007/s10450-016-9776-y

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