(444d) Depolymerization of Kraft Lignin to Value-Added Chemicals over a MoC1-X /Cu-MgAlOx Catalyst
AIChE Annual Meeting
2016
2016 AIChE Annual Meeting
Sustainable Engineering Forum
Value-Added Co-Products from Biorefineries
Tuesday, November 15, 2016 - 4:30pm to 4:55pm
Different contents of Mo were impregnated on CuMgAlOx prepared with a co-precipitation method, and the as prepared material was reduced in CH4/H2 flow to obtain the MoC1-x/Cu-MgAlOx catalyst. Lignin conversion experiments were carried out in ethanol with MoC1-x/Cu-MgAlOx catalyst of different Mo loading at 300 oC for 6 h. The liquid products were identified with a GCâ??MS instrument and quantified with a GC-FID instrument. Fig. 1 shows the gas chromatography of the liquid product of lignin depolymerization obtained with a 30 % Mo loading catalyst. About 50 kinds of compounds were detected and the products of ethanol self-reactions were excluded by comparison to a blank reaction. 25 compounds from lignin are categorized into five groups, i.e. alcohols, esters, arenes, phenols and benzyl alcohols, of which the detailed yields are given in Fig. 2. When CuMgAlOx (Mo loading=0) was used as the catalyst, the yield was relatively low with a 584 mg/g lignin total yield. When MoC1-x/Cu-MgAlOx was used as catalyst, almost all yields increased with the increase of Mo loading. When Mo loading reaches 30 %, all yields reach the maximum values and the yields of alcohols, esters, phenols, arenes and benzyl alcohols are 319, 768, 2, 207 and 125 mg/g lignin, respectively, with the total yield of 1421 mg/g lignin. This yield is lower than that obtained with MoC1-x/AC as a catalyst as we previously reported. However, the selectivity of MoC1-x/Cu-MgAlOx is different from that of MoC1-x/AC, which obtained higher yields of arenes and benzyl alcohols and lower yields of alcohols, esters and phenols. The difference in selectivity may be caused by the basicity of the CuMgAlOx.