Abstract
The selective synthesis of SAPO-5, SAPO-5/SAPO-34 mixture and SAPO-34 was performed by increasing Si/Al ratio and pH through hydrothermal synthesis route, in which the product was successively switched from AFI to AFI/CHA and to CHA. The samples were characterized by XRD, XRF, SEM, and NH3-TPD techniques. It indicates that the SAPO-5/SAPO-34 mixture exhibits higher acidity than the pure SAPO-5 and SAPO-34 phases. During methanol-to-olefins reaction, the catalytic lifetime of the SAPO-5/SAPO-34 mixture was significantly longer than that of SAPO-34, which may be attributed to the moderate acidity of the SAPO-5/SAPO-34 mixture.
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Acknowledgements
This study was supported by Postdoctoral Science Research Developmental Foundation of Heilongjiang Province of China (LBH-Z16176), Open Topics Fund of Key Laboratory of Functional Inorganic Material Chemistry (HDRCCX-201606), Foundation for Young Scientists of Heilongjiang University (QL201507).
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Bakhtiar, S.u.H., Ali, S., Dong, Y. et al. Selective synthesis of the SAPO-5 and SAPO-34 mixed phases by controlling Si/Al ratio and their excellent catalytic methanol to olefins performance. J Porous Mater 25, 1455–1461 (2018). https://doi.org/10.1007/s10934-018-0558-7
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DOI: https://doi.org/10.1007/s10934-018-0558-7