Hydrocarbon-Rich Bio-Oil Production from Ex Situ Catalytic Microwave Co-Pyrolysis of Peanut Shells and Low-Density Polyethylene over Zn-Modified Hierarchical Zeolite

IF 3.8 3区化学 Q2 CHEMISTRY, PHYSICAL

Catalysts Pub Date : 2024-01-21 DOI:10.3390/catal14010088

Zheng Dong, Yuanchong Yue, Jianmei Bai, Kun Chen, Mei Wang, Quan Bu

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Abstract

Peanut shells, a major economic and oil crop in China, boast an abundant availability and remarkably high lignin content compared to other agricultural residues. Previous work indicated that the modified hierarchical zeolite (Zn-ZSM-5/MCM41) was effective in promoting the conversion of intermediate macromolecules during the lignin pyrolysis reaction and enhancing the yield and selectivity of liquid products. Thereby, this study aims to improve the quality of liquid products in the ex situ catalytic microwave co-pyrolysis of peanut shells and LDPE by utilizing Zn-ZSM-5/MCM41. Employing a compound center experimental design, we optimized reaction conditions through response surface analysis. The impact of microwave pyrolysis temperature and the catalyst-to-feedstock ratio on yield distribution and liquid product selectivity was explored. Results indicated a marginal increase in liquid product yield with rising pyrolysis temperatures. Moreover, an initial increase followed by a subsequent decrease in liquid product yield was observed with an increase in the catalyst-to-feedstock ratio. Optimal conditions of 450 °C and a catalyst-to-peanut hull ratio of 2.34% yielded the highest bio-oil yield at 34.25%. GC/MS analysis of the bio-oil revealed a peak in hydrocarbon content at 68.36% under conditions of 450 °C and a catalyst-to-feedstock ratio of 13.66%. Additionally, the quadratic model effectively predicted bio-oil yield and the selectivity for major chemical components. This study underscores the potential of Zn-ZSM-5/MCM41 in optimizing liquid product quality during catalytic co-pyrolysis, offering insights into bio-oil production and its chemical composition.

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通过锌改性分级沸石对花生壳和低密度聚乙烯进行原位催化微波共热解生产富含烃的生物油

花生壳是中国的主要经济作物和油料作物，与其他农业残留物相比，花生壳资源丰富，木质素含量高。以往的研究表明，改性分层沸石（Zn-ZSM-5/MCM41）能有效促进木质素热解反应过程中中间大分子的转化，提高液体产物的产量和选择性。因此，本研究旨在利用 Zn-ZSM-5/MCM41 改善花生壳和低密度聚乙烯原位催化微波共热解过程中液体产物的质量。我们采用复合中心实验设计，通过响应面分析优化了反应条件。我们探讨了微波热解温度和催化剂与原料的比例对产率分布和液体产物选择性的影响。结果表明，随着热解温度的升高，液态产物的产率略有增加。此外，随着催化剂与原料比的增加，液态产物产率也出现了先增加后减少的现象。最佳条件为 450 °C，催化剂与花生壳的比例为 2.34%，生物油产量最高，达到 34.25%。生物油的气相色谱/质谱分析表明，在 450 °C 和催化剂与原料比为 13.66% 的条件下，碳氢化合物含量的峰值为 68.36%。此外，二次模型有效地预测了生物油产量和主要化学成分的选择性。这项研究强调了 Zn-ZSM-5/MCM41 在催化协同热解过程中优化液体产品质量的潜力，为生物油的生产及其化学成分提供了见解。

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来源期刊

Catalysts CHEMISTRY, PHYSICAL-

CiteScore

6.80

自引率

7.70%

发文量

1330

审稿时长

3 months

期刊介绍： Catalysts (ISSN 2073-4344) is an international open access journal of catalysts and catalyzed reactions. Catalysts publishes reviews, regular research papers (articles) and short communications. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. Therefore, there is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced.