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Low-temperature synthesis of hierarchical architectures of SAPO-11 zeolite as a good hydroisomerization support

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Abstract

Hierarchical SAPO-11 was successfully synthesized without a secondary template by changing the hydrothermal crystallization temperature. SAPO-11 with a larger external surface area, more acidity, and a large number of external active sites was constructed through a novel two-step crystallization strategy. Both precrystallization step and the low-temperature crystallization step were confirmed to be indispensable conditions for constructing hierarchical SAPO-11. After loading Pt nanoparticles by incipient wetness impregnation, the heptane hydroisomerizations based on 0.5 wt% Pt/C-SAPO-11-200 and 0.5 wt% Pt/T-SAPO-11-120 catalysts were carried out in a fixed-bed at a total pressure of 1.5 MPa with a H2/n-heptane volumetric of 400 and WHSV = 10 h−1. A conversion level of 75.7% of 0.5 wt% Pt/T-SAPO-11-120 catalyst was reached, which was higher than that of 0.5 wt% Pt/C-SAPO-11-200 catalyst (64.3%) at 300 °C. The enhanced performance achieved was attributed to the improved effect of the support, in terms of not only better mass transport and higher number of exposure active sites but also improved dispersity and decrease in the size of Pt particles.

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Acknowledgements

This work is supported by the National Natural Science Foundation of China (21473143, 21373168) and the Science and Technology Foundation of Guangxi (14125008-2-10).

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Authors and Affiliations

  1. National Engineering Laboratory for Green Chemical Productions of Alcohols, Ethers and Esters, College of Chemistry and Chemical Engineering, Xiamen University, Fujian, 361005, People’s Republic of China

    Zhou Chen, Yunyun Dong, Wenjing Song, Weikun Lai, Xiaodong Yi & Weiping Fang

  2. SINOPEC Catalyst Co., Ltd, Beijing, 100029, People’s Republic of China

    Shaoyang Jiang

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  1. Zhou Chen
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  2. Yunyun Dong
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  3. Shaoyang Jiang
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Correspondence to Xiaodong Yi.

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Chen, Z., Dong, Y., Jiang, S. et al. Low-temperature synthesis of hierarchical architectures of SAPO-11 zeolite as a good hydroisomerization support. J Mater Sci 52, 4460–4471 (2017). https://doi.org/10.1007/s10853-016-0692-z

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  • DOI: https://doi.org/10.1007/s10853-016-0692-z

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