Engineered $\mathrm{Ru}$ on $\mathrm{HY}$ zeolite catalyst for continuous and selective hydrodeoxygenation of lignin phenolics to cycloalkanes under moderate conditions

Here we report a continuous selective hydrodeoxygenation (HDO) process of guaiacol conversion to cycloalkanes under 180 °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...

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Published inApplied catalysis. A, General Vol. 676
Main Authors Adarsh Kumar, Fnu, Kumar, Abhishek, Santosa, Daniel M., Wang, Huamin, Zuo, Peng, Wang, Chongmin, Mittal, Ashutosh, Gieleciak, Rafal, Klein, Darryl P., Manto, Michael, Yang, Bin
Format Journal Article
LanguageEnglish
Published United States Elsevier 01.03.2024
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Summary:Here we report a continuous selective hydrodeoxygenation (HDO) process of guaiacol conversion to cycloalkanes under 180 °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 ß-ß and a-O-4 lignin representatives and real lignin bio-oil, and pave the way towards commercialization of lignin-based jet fuel
Bibliography:AC05-76RL01830; EE0009257; EE-0008250; AC36-08GO28308
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
USDOE Office of Science (SC), Biological and Environmental Research (BER)
PNNL-SA-195736; NREL/JA-2800-89356
ISSN:0926-860X