Heterogeneous catalysts that can depolymerize lignin without the need for high-pressure hydrogen are necessary for optimal biorefinery process economics. Solid bifunctional catalysts built on nitrate-intercalated layered double hydroxides are promising for this transformation. We have evaluated a systematic slate of lignin model compounds and found variations in catalyst activity and reaction pathway that depend on reaction solvent and the presence of phenolic OH groups, benzylic OH groups, and a pendant g-CH2OH on the inter-ring linkage. We have also evaluated catalytic activity on two process-relevant lignin streams. Phenol, guaiacol, and syringol are the main products when water is the solvent, but vinylphenol is produced in up to 5% yield and 80% selectivity under unoptimized conditions when 3-methyl-3-pentanol is the solvent. 1National Bioenergy Center, National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, Colorado 80401, USA. 2Hydrogen and Transportation Systems Center, National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, Colorado 80401, USA.

Nitrate-intercalated layered double-hydroxide catalysts for lignin depolymerization

251st National Meeting (2016)

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