Journal
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
Volume 133, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jtice.2022.104277
Keywords
Phosphotungstic acids; UiO-66; Metal-organic frameworks; Catalyst; Esterification
Categories
Funding
- Anhui Provincial Natural Science Foundation [2108085QB53]
- University Natural Science Research Key Project of Anhui Province [KJ2018A0435, KJ2019ZD043]
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A novel series of HPW@UiO-66 materials with different HPW loadings were successfully prepared, among which 30HPW@UiO-66 exhibited the highest activity due to its good dispersion and catalytic performance, showing great potential in the esterification process of acetic acid with n-butanol.
Background: The synthesis of highly efficient and stable heteropolyacids catalysts for the esterification of acetic acid with n-butanol is an urgent task. In this work, a novel series of 12-tungstophosphoric acid-encapsulated metal-organic framework UiO-66 materials (HPW@UiO-66) with different HPW loadings were successfully prepared via a one-pot hydrothermal method.Methods: The synthesized materials were systematically studied by FT-IR, PXRD, N2 adsorption, ICP-OES, SEM, TEM, TGA-DTG, NH3-TPD and XPS. Under the optimum reaction conditions of 120 degrees C temperature, 2:1 n-butanol/acetic acid molar ratio, 3.0 wt% catalyst amount, and 3 h reaction time, the highest conversion of acetic acid (80.2%) was achieved over 30HPW@UiO-66. Significant findings: The highest activity of 30HPW@UiO-66 could be attributed to its high dispersion of HPW, suitable specific surface area, total volume and total acidity. Meanwhile, the 30HPW@UiO-66 cycled to the fourth time still exhibited good catalytic activity. Moreover, an Eley-Rideal mechanism for the esterification reaction over the HPW@UiO-66 was proposed. Overall, the results demonstrated the potential of HPW@UiO66 for the esterification process. (c) 2022 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
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