Engineered Ru on HY Zeolite Catalyst for Continuous and Selective Hydrodeoxygenation of Lignin Phenolics to Cycloalkanes Under Moderate Conditions: Article No. 119649

Adarsh Kumar, Abhishek Kumar, Daniel Santosa, Huamin Wang, Peng Zuo, Chongmin Wang, Ashutosh Mittal, Rafal Gieleciak, Darryl Klein, Michael Manto, Bin Yang

Research output: Contribution to journalArticlepeer-review

Abstract

We report a continuous selective hydrodeoxygenation (HDO) process of guaiacol conversion to cycloalkanes under 180 degrees C/1 MPa, which results in improved HDO chemistry for lignin-based jet fuel production. The incipient wetness impregnation method was modified to prepare an HY zeolite-supported Ru catalyst with better metal dispersion and acid site uniformity, which overcomes the low conversion and selectivity of previous literature. The modified catalyst (Ru-HY-60-MI) was tested in a continuous fixed bed reactor, resulting in increased HDO conversion of guaiacol to cycloalkanes compared to the unmodified catalyst. Pressure, temperature, and weight hourly space velocity-dependent tests validate guaiacol HDO over Ru-HY-60-MI catalyzed ring hydrogenation of guaiacol to 2-methoxycyclohexanol, acid-catalyzed demethoxylation and dehydration to cyclohexene, and further hydrogenation of cyclohexene to cyclohexane. These experiments enable exploring a continuous HDO process, demonstrate effectiveness for other ..beta..-..beta.. and ..alpha..-O-4 lignin representatives and real lignin bio-oil, and pave the way towards commercialization of lignin-based jet fuel.
Original languageAmerican English
Number of pages12
JournalApplied Catalysis A: General
Volume676
DOIs
StatePublished - 2024

NREL Publication Number

  • NREL/JA-2800-89356

Keywords

  • continuous hydrodeoxygenation
  • cycloalkanes
  • engineered catalyst
  • lignin bio-oil
  • moderate conditions
  • sustainable biorefinery

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