Dehydration of 1,5-Pentanediol over ZrO 2 -ZnO Mixed Oxides

Charles Beasley, Muthu Kumaran Gnanamani, Michela Martinelli, Kinga Góra-Marek, Kaichiro Hamano, Wilson D. Shafer, Namal Wanninayake, Doo Young Kim

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Zn addition was found to affect both activity and selectivity of ZrO 2 for dehydration of 1,5-pentanediol. ZrO 2 tends to produce more or less equimolar mixture of tetrahydropyran (THP) derivatives and 4-penten-1-ol from 1,5-pentanediol. The conversion of 1,5-pentanediol on ZrO 2 increases with increasing Zn content up to 30–50 mole percent; however, catalyst containing Zn beyond 50 mole percent had an adverse effect on both conversion of diol and the selectivity for unsaturated alcohol (i. e., 4-penten-1-ol). XRD and Raman analysis infer that the presence of tetragonal ZrO 2, the amorphous phase (ZrO 2 , ZrZnO x , ZnO), and hexagonal wurtzite structure of ZnO in the catalysts. The interplanar spacing of ZrO 2 (111) and ZnO (100) planes for catalysts indicate that Zn incorporates into ZrO 2 lattice and vice-versa. Basicity assessed from CO 2 -TPD and acidity from FTIR-pyridine adsorption techniques indicate that both basicity and Lewis acid sites density increases with increasing Zn proportion on ZrO 2 up to 50:50 molar ratios of Zn to Zr. An optimum Zn:Zr mole ratio is required to achieve higher density of oxygen vacant metal sites (i. e., Lewis acidity) and balanced acid-base strength which improves the diol conversion.

Original languageEnglish
Pages (from-to)3123-3130
Number of pages8
JournalChemistrySelect
Volume4
Issue number11
DOIs
StatePublished - Mar 22 2019

Bibliographical note

Publisher Copyright:
© 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim

Keywords

  • 1,5-pentanediol
  • 4-penten-1-ol
  • Dehydration
  • FTIR
  • ZrO -ZnO
  • pyridine adsorption

ASJC Scopus subject areas

  • Chemistry (all)

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