TG-FTIR-MS study of synergistic effects during co-pyrolysis of corn stalk and high-density polyethylene (HDPE)
TG-FTIR-MS study of synergistic effects during co-pyrolysis of corn stalk and high-density polyethylene (HDPE)
复制标题
玉米秸秆与高密度聚乙烯（HDPE）共热解协同效应的TG-FTIR-MS研究
DOI：
10.1016/j.enconman.2018.11.065
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发表时间：
2019-02-01
影响因子：
10.4
通讯作者：
Li, Rundong
中科院分区：
文献类型：
--
作者：
Kai, Xingping;Yang, Tianhua;Li, Rundong
玉米秸秆与高密度聚乙烯共热解是一种有效的解决环境污染和再生利用问题塑料的方法。采用TG-FTIR-MS联用技术研究了CS与HDPE共热解过程中的脱挥发分动力学和气体组分的变化规律，并探讨了CS与HDPE之间可能的相互作用。CS-HDPE共混物的共热解过程分为两个分解阶段。第一阶段（150-400 ℃）主要与CS的分解有关。第二阶段（400-515 ℃）是CS和HDPE的热降解组合的结果，其中HDPE的降解贡献最大。CS与HDPE共热解可以延缓HDPE的热分解。此外，发现当CS的百分比为80%时，实验和理论重量损失之间的差异（Δ W）小于零。此外，实验活化能的平均值低于80%CS的理论值。因此，基于热分解行为和活化能，当CS含量为80%时，正协同作用最强。而CS-HDPE的共混比对共热解过程中气体产物的主要种类影响不大。在第一阶段（150-400 ℃），CS与HDPE的相互作用分别促进了CS含量为80%、60%和60%的共混物中H2-、CO/C2 H4和C3 H6的释放。此外，当CS含量小于60%时，脂肪烃（CH 4，C2 H6，C3 H8，C4 H10，C4 H8，C2 H2）和含氧化合物（醛，醇，酮，酸）的相互作用受到抑制。在第二阶段（400-850 ℃），脂肪烃（CH 4、C2 H6、C3 H8、C4 H10、C4 H8、C2 H2、C4 H6）的产率被抑制，与共混物中CS的含量无关。此外，当CS含量低于80%、80%和60%时，H-2、CO/C2 H4和C3 H6的生成分别得到促进。
Co-pyrolysis corn stalk (CS) and high-density polyethylene (HDPE) is an effective method to mitigate environmental pollution and reuse the problematic plastic to produce valuable energy. The devolatilization kinetics and the evolution of gaseous species during co-pyrolysis were investigated via TG-FTIR-MS. Moreover, the possible interactions of CS and HDPE were explored. The co-pyrolysis process of CS-HDPE blends was found to be divided into two decomposition stages. The first stage (150-400 degrees C) was mainly associated with the decomposition of CS. The second stage (400-515 degrees C) was the result of combinations of the thermal degradations of CS and HDPE, with the degradation of HDPE contributing the most. Co-pyrolysis CS with HDPE could delay the decomposition of HDPE. In addition, the difference between experimental and theoretical weight loss (Delta W) was found to be less than zero when the percentage of CS was 80%. Furthermore, the average of the experimental activation energy was lower than that of the theoretical value for 80% CS. Thus, the positive synergy was strongest when the CS content was 80%, based on the thermal decomposition behavior and the activation energy. However, the blending ratio of CS-HDPE had little effect on the major categories of gaseous products during co-pyrolysis. Moreover, the interaction between CS and HDPE in the first stage (150-400 degrees C) could promote the release of H-2, CO/C2H4 and C3H6 in the blends with 80%, 60%, and 60% CS, respectively. Additionally, aliphatic hydrocarbons (CH4, C2H6, C3H8, C4H10, C4H8, C2H2) and oxygen-containing compounds (aldehydes, alcohols, ketones, acids) were suppressed by the interaction when the percentage of CS was less than 60%. In the second stage (400-850 degrees C), the yields of aliphatic hydrocarbons (CH4, C2H6, C3H8, C4H10, C4H8, C2H2, C4H6) were inhibited, independent of the content of CS in the blends. In addition, the production of H-2, CO/C2H4, and C3H6 was promoted when the percentage of CS was below 80%, 80%, and 60%, respectively.