TY - JOUR
T1 - Catalytic depolymerisation of isolated lignin to fine chemicals: Depolymerisation of Kraft lignin
AU - Fragoso, Danielle Munick de Albuquerque
AU - Bouxin, Florent P.
AU - Montgomery, James R.D.
AU - Westwood, Nicholas J.
AU - Jackson, S. David
PY - 2020/2
Y1 - 2020/2
N2 - Kraft lignin depolymerisation over Pt/alumina, Rh/alumina and solvolysis was studied under a range of solvent solutions (ethanol/water, isopropanol/water, acetone/water 25:75, 50:50, 75:25 v/v), high temperature (573 K) and pressure (20 barg). The reactions generated mainly non-alkylated phenolic monomers, especially 2-methoxyphenol. In terms of overall yield, solvolysis was shown to be as effective as the catalysed reactions in some experiments. Nevertheless, it was found that for individual molecules a suitable combination of solvent mixture and catalyst resulted in the possibility of target compound generation. To contribute to an understanding of the mechanism of Kraft lignin depolymerisation, kinetic isotopic effects (KIE) were evaluated using fully deuterated and partially deuterated experiments. This revealed hydrogen exchange between the molecules and solvents. In addition, a variety of positive and inverse KIE showed the complexity of lignin depolymerisation and the direct involvement of solvents in those reactions.
AB - Kraft lignin depolymerisation over Pt/alumina, Rh/alumina and solvolysis was studied under a range of solvent solutions (ethanol/water, isopropanol/water, acetone/water 25:75, 50:50, 75:25 v/v), high temperature (573 K) and pressure (20 barg). The reactions generated mainly non-alkylated phenolic monomers, especially 2-methoxyphenol. In terms of overall yield, solvolysis was shown to be as effective as the catalysed reactions in some experiments. Nevertheless, it was found that for individual molecules a suitable combination of solvent mixture and catalyst resulted in the possibility of target compound generation. To contribute to an understanding of the mechanism of Kraft lignin depolymerisation, kinetic isotopic effects (KIE) were evaluated using fully deuterated and partially deuterated experiments. This revealed hydrogen exchange between the molecules and solvents. In addition, a variety of positive and inverse KIE showed the complexity of lignin depolymerisation and the direct involvement of solvents in those reactions.
KW - Depolymerisation
KW - Kinetic isotopic effect
KW - Kraft lignin
KW - Phenols
U2 - 10.1016/j.biteb.2020.100400
DO - 10.1016/j.biteb.2020.100400
M3 - Article
SN - 2589-014X
VL - 9
JO - Bioresource Technology Reports
JF - Bioresource Technology Reports
M1 - 100400
ER -