Journal
CATALYSIS TODAY
Volume 302, Issue -, Pages 190-195Publisher
ELSEVIER
DOI: 10.1016/j.cattod.2017.05.051
Keywords
Biomass; Lignin; Valorization; Catalytic transfer hydrogenolysis; Nanomaterials
Funding
- Southeastern Sun Grant Center
- US Department of Transportation, Research and Innovative Technology Administration [DTO559-07-G-00050]
- USDA NIFA [AFRI 2011-68005-30410]
- NSF [NSF EPS 1004083 TN-SCORE]
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In this work, FeB, NiB, and FeNiB nanomaterials were examined as catalysts for catalytic transfer hydrogenolysis (CTH) using supercritical ethanol (sc-EtOH) as the hydrogen donor and reaction solvent. The earth-abundant alloys were synthesized using simple aqueous chemical reductions and characterized using ICP-OES, XRD, and STEM-EDS. Using acetophenone to model the desired catalytic reactivity, FeNiB was identified as having superior reactivity (74% conversion) and selectivity for complete deoxygenation to ethylbenzene (84%) when compared to the monometallic materials. Given its high reactivity and selectivity for deoxygenation over ring saturation, FeNiB was screened as a lignin valorization catalyst. FeNiB mediates deoxygenation of aliphatic hydroxyl and carbonyls in organosolv lignin via CTH in sc-EtOH. A combination of gel permeation chromatography, GC/MS, and NMR spectroscopy was used to demonstrate the production of a slate of monomeric phenols with intact deoxygenated aliphatic side chains. In total, these results highlight the utility of CTH for the valorization of biorefinery-relevant lignin using an inexpensive, earth-abundant catalyst material and a green solvent system that can be directly derived from the polysaccharide fraction of lignocellulosic biomass.
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