2.5 Decomposition of Lignin Model Compounds
0.1 g (0.467 mmol) lignin model compound, 0.02 g catalyst and 20 mL water/ethanol (1:1) were added into the 100 mL stainless steel autoclave (Beijing Shijisenlang Chemical Machinery Co., Ltd., China). The autoclave was purged with N2 for three times and the pressure was increased to 1MPa hydrogen. And the catalytic reaction was carried out at 200 ºC for 5 h. After reaction, the mixture was filtered to remove catalyst. The organic products were extracted with ethyl acetate and analyzed by gas chromatography-mass spectrometry (GC-MS). The conversion of model compounds and the yield of products were calculated using the following Eq. (1) and Eq. (2):
Conversion (%) = WR/WS×100% (1)
Yield of product i (%) =ni /n m×100% (2)
Where WR is the weight of reacted after the hydrogenolysis of lignin model compound; WS is the weight of substrate (0.1 g); where ni andnm are the moles of product i and initially added compound (0.467 mmol), respectively.