Effect of Synthesis Temperature Formation of the Structure and Properties of Silicoaluminophosphate with the AEI Structure

Knyazeva, E. E.; Kasnerik, V. I.; Коннов, С. В.; Иванов, А. Л.; Dobryakova, I. V.; Иванова, И. И.

doi:10.1134/s0965544118140050

Cited by 2 publications

(2 citation statements)

References 7 publications

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“…The obtained solid presented crystals are around 150 µm, almost 20 times larger than those obtained under autogenous pressure. Interestingly, a high-pressure system seems to inhibit the formation of defects in the framework, being absent any resonance in the 1 H- 29 Si CP MAS NMR spectrum of the material obtained under 100 MPa. In contrast, resonances corresponding to Q 3 Si-(OSi) 3 (OH) groups are clearly visible in the spectrum measured for the MFI prepared under autogenous pressure.…”

Section: Introductionmentioning

confidence: 97%

“…SAPO-18 (IZA-SC three-letter code AEI) [6], is a small pore material that has shown high conversion and selectivity to light olefins in the methanol to olefins (MTO) reaction and lower deactivation than the SAPO-34 used in the industrial process [25,26]. Various parameters have been studied to improve the SAPO-18 crystallization and its catalytic properties [27][28][29]. In this work, the hydrothermal synthesis of SAPO-18 under different hydrostatic pressures was explored.…”

Section: Introductionmentioning

confidence: 99%

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Exploring Hydrothermal Synthesis of SAPO-18 under High Hydrostatic Pressure

et al. 2022

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The effect of external hydrostatic pressure on the hydrothermal synthesis of the microporous silicoaluminophosphate SAPO-18 has been explored. The crystallization of the SAPO-18 phase is inhibited at 150 °C under high pressures (200 MPa) when using relatively diluted synthesis mixtures. On the contrary, the use of concentrated synthesis mixtures allowed SAPO-18 to be obtained in all the studied conditions. The obtained solids were characterized with XRD, SEM, ICP-AES, TG and 27Al and 31P MAS NMR spectroscopy. The results highlight the importance of the external pressure effect on the hydrothermal synthesis of molecular sieves and its influence on the interaction between the organic molecule and the silicoaluminophosphate network.

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Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Exploring Hydrothermal Synthesis of SAPO-18 under High Hydrostatic Pressure

et al. 2022

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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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Nazari,

Behbahani

et al. 2023

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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, and EDS 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 ndings 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 ole ns of approximately 80%. Nevertheless, the impact of preparation, aging, and post-treatment conditions on the hydrogen transfer index and alkanes production was signi cant.

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Effect of Synthesis Temperature Formation of the Structure and Properties of Silicoaluminophosphate with the AEI Structure

Cited by 2 publications

References 7 publications

Exploring Hydrothermal Synthesis of SAPO-18 under High Hydrostatic Pressure

Exploring Hydrothermal Synthesis of SAPO-18 under High Hydrostatic Pressure

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

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