Abstract
To investigate the effects of components on the two-step pyrolysis (TSP) of lignocellulosic biomass, the comparative study on TSP of walnut shell (WS), cotton stalk (CS), corncob (CC) and their acid washed samples (AWS, ACS, ACC) was conducted by TG-FTIR and Py-GC/MS. TG-FTIR analysis showed that the higher lignin content of WS lead to the lowest weight loss. CS and CC had higher content of holocellulose and generated more CO2 and carbonyl compounds. The inorganic component increased pyrolysis residue. CC and CS released most holocellulose derivatives in the first step (S1), and WS produced more phenols in the second step (S2). The removal of inorganic component increased the contents of sugars and furans in TSP. Higher selectivities of different value-added compounds could be achieved by different lignocellulosic biomass in TSP due to the fractionated conversion of components and different component proportions, such as acids (23.10 %, WS, S1), furans (12.11 %, ACS, S1), ketones (12.97 %, CC, S1) and sugars (54.81 %, ACC, S2), etc. TSP could facilitate the utilization of lignocellulose biomass in fine chemical or fuel.
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