Synthesis of composite zeolites composed of SAPO-5 and SAPO-34 and its application in methanol dehydration to light olefins

Abstract

In present work, bi-phases composite zeolites consisting of SAPO-5 and SAPO-34 (named as SSC) are prepared by a traditional hydrothermal way, and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), N2 adsorption–desorption, intelligent gravimetric analyzer (IGA), intrusive mercury technology, and NH3-TPD techniques. The results display that the crystals in the as-synthesized composites have a hierarchical pore system with a size of about 3–130 nm, which displays a butterfly-like pattern on the crystal faces and runs throughout the whole crystal. Catalytic performances of the as-synthesized SSC catalysts are tested during methanol to olefin (MTO). As compared with a microporous composite catalyst, the hierarchical SSC composite catalyst displays excellent catalytic performances with a prolonged catalytic life and an elevated selectivity for light olefins.

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Acknowledgements

This work is supported by NSFC (21975174, 21706177), National Key R&D Program of China (2020YFB0606405) and SinoPEC (116050).

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Correspondence to Zhiping Liu.

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Bai, Y., Zeng, Q., Sun, J. et al. Synthesis of composite zeolites composed of SAPO-5 and SAPO-34 and its application in methanol dehydration to light olefins. J Porous Mater (2021). https://doi.org/10.1007/s10934-021-01078-0

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Keywords

  • Hierarchical pores
  • SAPO-5
  • SAPO-34
  • Butterfly-like distribution
  • Methanol to olefins