Synergistic effects on co-pyrolysis of low-temperature hydrothermally pretreated high-protein microalgae and polypropylene
Synergistic effects on co-pyrolysis of low-temperature hydrothermally pretreated high-protein microalgae and polypropylene
复制标题
低温水热预处理高蛋白微藻与聚丙烯共热解的协同效应
DOI：
10.1016/j.enconman.2020.113772
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发表时间：
2021-02
影响因子：
10.4
通讯作者：
Chuangzhi Wu
中科院分区：
文献类型：
--
作者：
Xianchao Lv;Huacai Liu;Yanqin Huang;Jiagui Yao;Hongyou Yuan;Xiuli Yin;Chuangzhi Wu
富含蛋白质（58.50%）的小球藻。在175 °C下水热预处理以去除部分N，然后将所得固体残渣（ChSR）与聚丙烯（PP）共热解以降低O含量并改善生物油品质。在水热预处理过程中，约48.25%的氮被富集到水相中，得到约15.70%的低氮生物油（3.45%）。13 C NMR分析表明，与原料相比，ChSR的结构进一步芳构化。利用在线TG-FTIR-MS和Py-GC/MS对ChSR与PP的相互作用进行了深入研究。第一阶段（150-400 °C）主要是ChSR的热降解，第二阶段（400-550 °C）是ChSR和PP热降解共同作用的结果，其中PP的热降解贡献最大。PP的加入促进了ChSR的热解，抑制了C2 H5 O +/COOH+和NH3的释放，但促进了第一阶段CO2的释放。然而，ChSR延迟了PP的热解并抑制了H2和轻质烃的释放（即，CH 4、C2 H2、C2 H6、C3 H7等）。基于Flynn-Wall-Ozawa（FWO）方法的动力学分析表明，共混物在两个分解阶段的平均活化能（E）分别为159.10-164.12 kJ/kg和194.20-219.86 kJ/kg。Py-GC/MS结果表明，ChSR和PP之间的协同作用显著促进了烃类的形成（即，环己烷衍生物和2，4-二甲基-1-庚烯），当ChSR：PP为80：20时，相互作用达到最大。含氧化合物（醇和酚类）和BTEX（苯系列）的产率下降。值得注意的是，N-杂环化合物的数量和种类都有所减少。最后，对ChSR与PP相互作用的可能机理进行了探讨。本研究为进一步开发利用高蛋白微藻资源提供了有益的参考。
Protein-rich (58.50%)Chlorellasp. was hydrothermally pretreated at 175 °C to remove part of N, and the obtained solid residue (ChSR) was then co-pyrolyzed with polypropylene (PP) to reduce O content and improve bio-oil quality. About 48.25% of N was enriched into the aqueous phase during hydrothermal pretreatment (HTP) process, and about 15.70% of bio-oil with low N content (3.45%) was obtained. Compared with that of raw sample, the structure of ChSR was further aromatized as revealed by13C NMR analysis. The interaction between ChSR and PP was deeply investigated with the help of online TG-FTIR-MS and Py-GC/MS. The co-pyrolysis process of ChSR-PP blends was generally divided into two thermal decomposition stages. The first stage (150–400 °C) was mainly associated with decomposition of ChSR, while the second stage (400–550 °C) was the results of combination of thermal degradations of ChSR and PP, with the primary contribution from the degradation of PP. The addition of PP accelerated pyrolysis of ChSR and inhibited the release of C2H5O+/COOH+and NH3but promoted CO2releasing at the first stage. However, ChSR delayed the pyrolysis of PP and prohibited release of H2and light hydrocarbons (i.e., CH4, C2H2, C2H6, C3H7, and so on) from PP at the second stage. Kinetic analysis based on the Flynn-Wall-Ozawa (FWO) method revealed that the average activation energy (E) of the blends at the two decomposition stages were 159.10–164.12 kJ/kg and 194.20–219.86 kJ/kg, respectively. Results of Py-GC/MS indicated that, the synergistic effect between ChSR and PP significantly enhanced the formation of hydrocarbons (i.e., cyclohexane derivatives and 2,4-Dimethyl-1-heptene), and the interaction achieved maximum when the ratio of ChSR:PP was 80:20. The yields of O-containing compounds (alcohols, and phenols) and BTEXs (Benzene series) were decreased. It should be noted that both the amounts and kinds of N-heterocyclic compounds were decreased. Finally, the possible mechanism on interaction between ChSR and PP was also proposed. This work will provide useful information on better utilization of high-protein microalgae.
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影响因子：
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作者：
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