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Grinding synthesis of SAPO-18 zeolite by a single/dual-template route: which is the best catalyst of methanol-to-olefins reaction?

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Abstract

In this study, different templates (DIEA: N,N-diisopropylethylamine; TEAOH: tetraethylammonium hydroxide; DEA: diethylamine) were selected to conduct the grinding synthesis of SAPO-18 molecular sieves. The physicochemical properties of the synthesized SAPO-18 samples were thoroughly analyzed by XRD, CHN elemental measurements, TG, 13C NMR, SEM, EDS, N2 adsorption/desorption, and NH3-TPD experiments. The results show that SAPO-18 molecular sieves with better phase purity are synthesized only at the molar ratios of DIEA/TEAOH = 0.5/0.5 and DIEA/DEA = 0.9/0.1 for the dual template systems. The 13C NMR measurement indicates that the actual template is TEAOH for the sample SP18-DIEA0.5TEAOH0.5 instead of the mixture of TEAOH and DIEA. SEM, N2 adsorption/desorption, and NH3-TPD results suggest that the crystal size, textural parameters, and acidic properties of these SAPO-18 samples vary with the types of template molecules. The catalytic performances of three representative SAPO-18 catalysts were evaluated in the methanol-to-olefins (MTO) reaction. Owing to its unique sheet-like morphology and suitable acidity, the sample SP18-DIEA0.5TEAOH0.5 exhibits the best catalytic performances in the MTO reaction, giving the longest catalytic lifetime of 430 min and ethylene plus propylene selectivity of 86%.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant No. 21666019, 22168022)

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  1. Key Laboratory of Low Carbon Energy and Chemical Engineering of Gansu Province, School of Petrochemical Technology, Lanzhou University of Technology, Lanzhou, 730050, China

    Li Niu, Yanru Li, Xuefeng Long, Dong Ji, Dongliang Wang, Hongwei Li & Xinhong Zhao

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  1. Li Niu
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  2. Yanru Li
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Correspondence to Xinhong Zhao.

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Niu, L., Li, Y., Long, X. et al. Grinding synthesis of SAPO-18 zeolite by a single/dual-template route: which is the best catalyst of methanol-to-olefins reaction?. Reac Kinet Mech Cat 135, 3085–3098 (2022). https://doi.org/10.1007/s11144-022-02295-7

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