On-purpose production of propane fuel gas from the hydrothermal reactions of n-butanol over Pt/Al2O3 catalyst: A parametric and mechanistic study

Onajite T. Abafe Diejomaoh, Jude A. Onwudili*, Keith E. Simons, Priscila Maziero

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Production of components of liquefied petroleum gases (LPG) from biomass can become a sustainable pathway towards the defossilisation of off-grid locations for heating and transport applications. The reactions of butanol in the presence of 5 wt% Pt/Al2O3 across a set of reaction temperatures (200 °C to 300 °C), reaction times (up to 2 h), n-butanol concentrations (up to 30 wt%) and various feedstock-to-catalyst mass ratios were investigated and optimised. High conversion of n-butanol to gas products (99.91 wt%), high yield of propane (63.56 wt%) and propane hydrocarbon selectivity of 88.87 % were achieved in a batch reactor after 2 h of reaction at 300 °C. The formation of propane appeared to be from several mechanisms including decarbonylation, dehydration, C–O and C–C hydrogenolysis and hydrogenation. Significant yields of hydrogen and butane were formed, which may support the complex mechanistic pathways involved in n-butanol conversion. The 5 wt% Pt/Al2O3 catalyst was stable for up to two reaction cycles under the conditions investigated before mainly deactivating via hydrolysis of the alumina support and coke formation. This present work shows that n-butanol is a potential bio-derived feedstock to produce on-purpose biopropane fuel gas via catalytic hydrothermal processing.
Original languageEnglish
Article number131140
Number of pages11
JournalFuel
Volume365
Early online date9 Feb 2024
DOIs
Publication statusE-pub ahead of print - 9 Feb 2024

Bibliographical note

Copyright © 2024 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY license (https://creativecommons.org/licenses/by/4.0/).

Data Access Statement

Data will be made available on request.

Keywords

  • Biopropane
  • Hydrogen
  • Biobutanol
  • Reaction mechanisms
  • Catalytic hydrothermal processing
  • Defossilisation

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