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August 16, 2026ReactionsOpen Access

Simultaneously Improving the Selectivity and Stability of HZSM-5 Zeolite by NaOH Treatment in Aqueous Ethanol-to-Propylene Reactions

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Authors

TMTao MengJHJiaojiao HuangfuYRYi Ru

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Overview

Experimental study demonstrates enhanced propylene selectivity and catalytic stability using 0.2 mol/L NaOH-treated HZSM-5 zeolite, indicating an optimal balance of mesoporosity and acidity.

Key Points

  • To investigate the influence of sodium hydroxide (NaOH) concentration on the pore architecture, acidity, and catalytic performance of nanoscale HZSM-5 zeolites during aqueous ethanol-to-propylene conversion.
  • Synthesized mesoporous nanoscale HZSM-5 zeolites through alkali treatment with varying concentrations of NaOH (including 0.2 mol/L and 0.4 mol/L).
  • Characterized catalysts using XRD, SEM, NMR, ICP-OES, N2 adsorption/desorption, NH3-TPD, Py-IR, and TG analyses.
  • Evaluated catalytic performance, selectivity, and stability in selective conversion reactions of aqueous ethanol to propylene.
  • Treatment with 0.2 mol/L NaOH (AZ-0.2) generated higher mesopore volumes, increased Brønsted-to-Lewis acid ratios, and optimal acidity, which simultaneously enhanced propylene selectivity and catalyst longevity.
  • High-concentration treatment with 0.4 mol/L NaOH (AZ-0.4) caused severe desilication, markedly increasing the strength and concentration of strong acid sites and leading to a significant decrease in selectivity and stability.

Cite This Study

Meng et al. (2026) studied this question.

synapsesocial.com/papers/6a81799af2fb91fc834acc56https://doi.org/10.3390/reactions7030048
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