The dominating catalytic approach to aromatic hydrocarbons from renewables, deoxygenation of phenol-rich depolymerized lignin bio-oils, is hard to achieve: hydrodeoxygenation (HDO) of phenols typically leads to the loss of aromaticity and to non-negligible fractions of cyclohexanones and cyclohexanols. Here, we report a catalyst, niobia-supported iridium nanoparticles (Ir@NbO), which combines full conversion in the HDO of lignin-derived phenols with appreciable and tunable selectivity for aromatics (25-95%) under mild conditions (200-300 °C, 2.5-10 bar of H). A simple approach to the removal of Brønsted-acidic sites via Hünig's base prevents coking and allows reaction conditions ( > 225 °C, 2.5 bar of H), promoting high yields of aromatic hydrocarbons.
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| http://dx.doi.org/10.1021/acsomega.2c04314 | DOI Listing |
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