Co-pyrolysis of cellulose and polyethylene terephthalate from waste textiles for fuel gas production by synergistic effect

IF 5.6 2区工程技术 Q2 ENERGY & FUELS

Journal of The Energy Institute Pub Date : 2025-04-09 DOI:10.1016/j.joei.2025.102095

Ludi Wang , Peimin Liang , Zhipeng Tian , Liujie Xu , Qingbin Song , Chao Wang , Ming Zhao

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引用次数: 0

Abstract

Difficulty in separating natural and synthetic fibers in blended textiles challenges the resourcing of waste textiles. Pyrolysis is an essential process for energy conversion of waste, but the mechanism of co-pyrolysis from blended textiles to syngas production is not clear. For this, the impact of synergistic effects on product distribution in the co-pyrolysis of cellulose (CE) and polyethylene terephthalate (PET) from waste textiles was investigated. The composition and distribution of the gaseous products with different ratios of CE/PET blends were focused on, and the optimized blending ratios were determined in association with thermogravimetric analyses. Then, the contribution of catalytic co-pyrolysis to the fuel gas (a summary of H₂, CH₄, and CO) production was tested. Bio-calcium-based MgO-CaO from oyster shells was used as a catalyst for the co-pyrolysis of CE/PET blends. The enhancement of fuel gas production by synergistic effect during the co-pyrolysis of cellulose and polyethylene terephthalate was revealed. The CE/PET blends with a mass ratio of 3.5:6.5 exhibited the highest fuel gas yield due to the strongest synergistic effect during the co-pyrolysis process. The distribution of small molecular gases has been enhanced due to the impact of synergistic effects, leading to a notable increase in CO yield. Data analysis reveals that the CE/PET blend at the specified ratio yielded a fuel gas output of 13.85 mmol/g with a measured higher heating value (HHV) of 276.87 kJ/mol at a temperature of 850 °C, corresponding to a fuel gas distribution of 67.43 %. Furthermore, in the context of catalytic co-pyrolysis, the fuel gas yield was significantly enhanced to 19.66 mmol/g, accompanied by an improved HHV of 304.68 kJ/mol and a fuel gas distribution of 78.64 %. This work offers a novel perspective on the high-value utilization of fibers with different compositions from blended waste textiles via co-pyrolysis.

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利用协同效应对废纺织品中纤维素和聚对苯二甲酸乙二醇酯共热解制燃气进行研究

混纺纺织品中天然纤维和合成纤维的分离困难对废纺织品的资源化提出了挑战。热解是废物能量转化的重要过程，但混纺纺织品共热解制合成气的机理尚不清楚。为此，研究了废纺织品纤维素（CE）和聚对苯二甲酸乙二醇酯（PET）共热解过程中协同效应对产物分布的影响。研究了不同比例CE/PET共混物的气体组成和分布，并结合热重分析确定了最佳共混比例。然后，测试了催化共热解对燃料气（H2、CH4和CO）生成的贡献。以牡蛎壳生物钙基氧化镁为催化剂，对CE/PET共热解进行了催化。揭示了纤维素与聚对苯二甲酸乙二醇酯共热解过程中协同效应对燃料气产率的促进作用。当CE/PET共热解质量比为3.5:6.5时，共热解过程中的协同效应最强，燃料气产率最高。由于协同效应的影响，小分子气体的分布得到加强，导致CO产率显著提高。数据分析表明，在特定配比下，CE/PET共混物在850℃下的燃气输出量为13.85 mmol/g，热值（HHV）为276.87 kJ/mol，对应的燃气分布为67.43%。此外，在催化共热解条件下，燃料气产率显著提高至19.66 mmol/g， HHV提高至304.68 kJ/mol，燃料气分布为78.64%。这项工作为通过共热解从混合废纺织品中提取不同成分的纤维的高价值利用提供了一个新的视角。

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来源期刊

Journal of The Energy Institute 工程技术-能源与燃料

CiteScore

10.60

自引率

5.30%

发文量

166

审稿时长

16 days

期刊介绍： The Journal of the Energy Institute provides peer reviewed coverage of original high quality research on energy, engineering and technology.The coverage is broad and the main areas of interest include: Combustion engineering and associated technologies; process heating; power generation; engines and propulsion; emissions and environmental pollution control; clean coal technologies; carbon abatement technologies Emissions and environmental pollution control; safety and hazards; Clean coal technologies; carbon abatement technologies, including carbon capture and storage, CCS; Petroleum engineering and fuel quality, including storage and transport Alternative energy sources; biomass utilisation and biomass conversion technologies; energy from waste, incineration and recycling Energy conversion, energy recovery and energy efficiency; space heating, fuel cells, heat pumps and cooling systems Energy storage The journal''s coverage reflects changes in energy technology that result from the transition to more efficient energy production and end use together with reduced carbon emission.