“…Molybdenum oxide, sulfide, nitride, and carbide were studied as catalysts for the HDO reaction of lignin and model compounds as early as in the 1980s . In MoO 3 -catalyzed HDO of lignin model compounds, it was found that MoO 3 preferentially cleaved phenolic Ph-O-Me bonds over weaker aliphatic Ph-O-Me bonds .…”