Ultrafast dealumination of *BEA zeolite using a continuous-flow reactor

Minami, Ayano; Takemoto, Masanori; Yonezawa, Yasuo; Liu, Zhendong; Yanaba, Yutaka; Anand, Chokkalingam; Iyoki, Kenta; Sano, Tsuneji; Okubo, Tatsuya; Wakihara, Toru

doi:10.1016/j.apt.2022.103702

Cited by 5 publications

(2 citation statements)

References 26 publications

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“…22 There are different dealumination processes, such as steaming with water vapor, SiCl 4 vapor, hydrothermal treatment, microwave-assisted hydrothermal treatment, or acid leaching. 23 The last one, acid leaching, is the most commonly used, due to its simplicity. 24 The present study is focused on the impact of the acid-site density in the methanol-to-olefins (MTO) reaction in the zeolite beta.…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, aluminum removal from the zeolite framework can affect the crystal morphology, porosity, and acid-site strength and distribution . There are different dealumination processes, such as steaming with water vapor, SiCl 4 vapor, hydrothermal treatment, microwave-assisted hydrothermal treatment, or acid leaching . The last one, acid leaching, is the most commonly used, due to its simplicity …”

Section: Introductionmentioning

confidence: 99%

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Brønsted Acid-Site Density Controls the Mechanistic Cycle and Product Selectivity in the Methanol-to-Hydrocarbons Reaction in BEA Zeolite

Navarro de Miguel,

Chung,

Dikhtiarenko

et al. 2024

ACS Catal.

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In this work, we show that the acid-site density controls the dominant cycle during the methanol-to-hydrocarbons reaction on beta zeolite. Our experimental evidence is based on the study of beta zeolites with very similar diffusional pathways and different aluminum content. High selectivity to propylene was observed for samples with low Brønsted acid-site density, which is a consequence of the promotion of the olefinic cycle. Our results also confirm that the production of ethylene via the olefinic cycle is negligible. In contrast, high ethylene and aromatics are found at a high Brønsted acid-site density, highlighting the predominancy of the aromatic cycle. Operando UV− vis data show that monoenylic carbocationic species predominate on the olefinic cycle, whereas the aromatic cycle is dominated by polyalkylated monoaromatics. Analysis of the spectroscopy data also shows a linear correlation of the formation of polyaromatic species with the Brønsted acid-site density.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%