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.

中文翻译：

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不同木质纤维素生物质两步热解的比较研究：组分的影响

摘要 为了研究组分对木质纤维素生物质两步热解 (TSP) 的影响，对核桃壳 (WS)、棉秆 (CS)、玉米芯 (CC) 及其酸洗样品 (AWS, ACS, ACC) 通过 TG-FTIR 和 Py-GC/MS 进行。TG-FTIR 分析表明，WS 较高的木质素含量导致最低的失重。CS和CC的全纤维素含量更高，产生更多的CO2和羰基化合物。无机组分增加了热解残渣。CC 和 CS 在第一步 (S1) 中释放了大部分全纤维素衍生物，而 WS 在第二步 (S2) 中产生了更多的酚类。无机成分的去除增加了TSP中糖类和呋喃的含量。