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Comparison of Aminothermal and Hydrothermal Synthesis of SAPO-34: Impact of Synthesis Conditions on Catalyst Characteristics and MTO Catalytic Performance

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Abstract

The present study investigates the aminothermal synthesis of SAPO-34 using various templates, including morpholine, diethylamine, triethylamine, triethanolamine, diglycolamine, and diisopropylamine, under static conditions. The catalyst's characteristics were assessed through XRD, SEM, EDS and FTIR analyses, and the catalytic behavior of the samples was studied in the MTO reaction. The results indicate that only morpholine leads to the formation of pure SAPO-34, and it is essential to regulate the crystallization time to prevent the formation of SAPO-20. Furthermore, the impact of the order of reactant addition and the intensity of stirring during aging on catalyst characteristics was investigated, and the outcomes were compared to those of the hydrothermally synthesized sample. The findings reveal that the aminothermal method reduces the crystallization time and enhances silica incorporation. However, this technique is recommended for the synthesis using polar templates or in the presence of polar additives. The utilization of non-polar templates such as DEA and TEA resulted in very thick pastes. The catalytic performance of the aminothermal samples was comparable to that of the hydrothermal samples, with a methanol conversion of over 98% and a selectivity to light olefins of approximately 80%. Nevertheless, the impact of preparation, aging, and post-treatment conditions on the hydrogen transfer index and alkanes production was significant.

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Acknowledgements

The authors gratefully acknowledge the support from National Petrochemical Company, Research and Technology Company (NPC-RT).

Funding

This research was supported by National Petrochemical Company, Research and Technology Company (NPC-RT) under grant number 0860240003.

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Authors and Affiliations

  1. Gas Engineering Department, Petroleum University of Technology, Ahwaz, 63431, Iran

    Motahare Zare & Reza Mosayebi Behbahani

  2. Chemical Engineering Department, Esfarayen University of Technology, Esfarayen, 9661998195, North Khorasan, Iran

    Mohadese Nazari

  3. National Petrochemical Company, Petrochemical Research and Technology Company, Tehran, 1435884711, Iran

    Marzieh Hamidzadeh

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Contributions

R.M. Behbahani and M. Nazari conceptualized and designed the study. M. Zare conducted the experiments and collected the data. M. Nazari and M. Zare analyzed the data. M. Hamidzadeh provided fundamental guidance in conducting the characteristic analysis and reactor test setup. M. Nazari wrote the draft of the manuscript. M. Behbahani and M. Hamidzadeh provided critical feedback on the manuscript. All authors have read and approved the final version of the manuscript for publication.

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Correspondence to Mohadese Nazari or Reza Mosayebi Behbahani.

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Zare, M., Nazari, M., Behbahani, R.M. et al. Comparison of Aminothermal and Hydrothermal Synthesis of SAPO-34: Impact of Synthesis Conditions on Catalyst Characteristics and MTO Catalytic Performance. Silicon 16, 177–188 (2024). https://doi.org/10.1007/s12633-023-02669-z

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