Guaiacol hydrotreatment in an integrated APR-HDO process: Exploring the promoting effect of platinum on Ni–Pt catalysts and assessing methanol and glycerol as hydrogen sources

Wei Jin, Jesus Gandara-Loe, Laura Pastor-Pérez, Juan J. Villora-Picó, Antonio Sepúlveda-Escribano, Roberto Rinaldi*, Tomas Ramirez Reina*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)
2 Downloads (Pure)

Abstract

This study presents an integrated approach combining aqueous phase reforming (APR) and hydrodeoxygenation (HDO) for the hydrotreatment of guaiacol, a model compound representing lignin-derived phenols in pyrolysis bio-oils. The APR process enables in-situ H2 generation, eliminating the need for an external hydrogen source. We examine the interplay between metal species, the Pt-promoting effect on Ni–Pt catalyst supported on activated carbon (AC), and the choice of hydrogen source (methanol or glycerol). Amongst the monometallic catalysts, a 1% Pt/AC catalyst notably achieved over 96% guaiacol conversion at 300 °C with either hydrogen source. Interestingly, when 0.5–1% of the Ni loading is replaced with Pt, the resulting bimetallic Ni–Pt/AC catalysts demonstrate a significant improvement in guaiacol conversion, reaching 70% when methanol is employed as the hydrogen source. Surprisingly, no comparable enhancement in guaiacol conversion is observed when employing glycerol as the hydrogen source. This observation underlines one of the pivotal effects of the hydrogen source on catalyst performance. X-ray photoemission spectroscopy (XPS) pinpointed strong Ni–Pt interactions in the catalyst. It also revealed distinctive electronic features of Ni–Pt/AC, which are favourable for steering selectivity towards cyclohexanol rather than phenol when Pt loading is increased from 0.5 to 1%. Moreover, Pt enhanced catalyst stability by inhibiting the oxidation of Ni sites and mitigating Ni–Pt phase sintering. Overall, our findings offer important insights into integrating APR and HDO processes, the promotion effect of Pt, and the importance of hydrogen source selection in terms of guaiacol conversion and catalyst stability.

Original languageEnglish
Article number118907
JournalRenewable Energy
Volume215
Early online date19 Jun 2023
DOIs
Publication statusPublished - Oct 2023
Externally publishedYes

Keywords

  • Aqueous phase reforming
  • Biomass upgrading
  • Hydrodeoxygenation
  • Ni–Pt catalysts

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment

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