Control of Morphology and Acidity of SAPO-5 for the Methanol-To- Olefins (MTO) Reaction

doi:10.4172/2090-4568.1000138

Cited by 2 publications

(2 citation statements)

References 40 publications

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“…As the template was introduced (x = 1.0, S2), sharp peaks of SAPO-5 at 2θ values of 7.9 • , 20 • , 23 • , and 26 • were observed [34]. In the SEM image, large aggregates of SAPO-5 with the typical hexagonal morphology were seen [35]. The average particle size of these aggregates was around 3.91 µm as shown by the DLS data (Figure S1).…”

Section: Effect Of Template Concentration (X) On the Formation Of Sapo-34 Particlesmentioning

confidence: 88%

Synthesis of SAPO-34 Nanoplates with High Si/Al Ratio and Improved Acid Site Density

et al. 2021

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Two-dimensional SAPO-34 molecular sieves were synthesized by microwave hydrothermal process. The concentrations of structure directing agent (SDA), phosphoric acid, and silicon in the gel solution were varied and their effect on phase, shape, and composition of synthesized particles was studied. The synthesized particles were characterized by various techniques using SEM, XRD, BET, EDX, and NH3-TPD. Various morphologies of particles including isotropic, hyper rectangle, and nanoplates were obtained. It was found that the Si/Al ratio of the SAPO-34 particles was in a direct relationship with the density of acid sites. Moreover, the gel composition and preparation affected the chemistry of the synthesized particles. The slow addition of phosphoric acid improved the homogeneity of synthesis gel and resulted in SAPO-34 nanoplates with high density of acid sites, 3.482 mmol/g. The SAPO-34 nanoplates are expected to serve as a high performance catalyst due to the low mass transfer resistance and the high density of active sites.

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Section: Effect Of Template Concentration (X) On the Formation Of Sapo-34 Particlesmentioning

confidence: 88%

Synthesis of SAPO-34 Nanoplates with High Si/Al Ratio and Improved Acid Site Density

et al. 2021

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“…These results are consistent with the PXRD results. In the case of the remaining samples, significant differences in morphology were visible, which may result from different chemical compositions and crystallization conditions (Table 2) [32,[41][42][43]. In the case of SAPO-0.1 and SAPO-0.6, as the silicon content increased, the morphology changed from hexagonal plates to spherical aggregates.…”

Section: Morphologymentioning

confidence: 99%

Synthesis and Characterization of Proton-Conducting Composites Prepared by Introducing Imidazole or 1,2,4-Triazole into AlPO-5 and SAPO-5 Molecular Sieves

Ostrowski,

Jankowska,

Tabero

et al. 2023

Molecules

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The present work concerns proton-conducting composites obtained by replacing the water molecules present in aluminophosphate and silicoaluminophosphate AFI-type molecular sieves (AlPO-5 and SAPO-5) with azole molecules (imidazole or 1,2,4-triazole). Both the introduction of azoles and the generation of Brønsted acid centers by isomorphous substitution in aluminophosphate materials were aimed at improving the proton conductivity of the materials and its stability. In the presented study, AlPO-5 and several SAPO-5 materials differing in silicon content were synthesized. The obtained porous matrices were studied using PXRD, low-temperature nitrogen sorption, TPD-NH3, FTIR, and SEM. The proton conductivity of composites was measured using impedance spectroscopy. The results show that the increase in silicon content of the porous matrices is accompanied by an increase in their acidity. However, this does not translate into an increase in the conductivity of the azole composites. Triazole composites show lower conductivity and significantly higher activation energies than imidazole composites; however, most triazole composites show much higher stability. The different conductivity values for imidazole and triazole composites may be due to differences in chemical properties of the azoles.

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Control of Morphology and Acidity of SAPO-5 for the Methanol-To- Olefins (MTO) Reaction

Cited by 2 publications

References 40 publications

Synthesis of SAPO-34 Nanoplates with High Si/Al Ratio and Improved Acid Site Density

Synthesis of SAPO-34 Nanoplates with High Si/Al Ratio and Improved Acid Site Density

Synthesis and Characterization of Proton-Conducting Composites Prepared by Introducing Imidazole or 1,2,4-Triazole into AlPO-5 and SAPO-5 Molecular Sieves

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