Graduate Institute of Environmental Engineering, National Central University, Taiwan, No. 300, Chung-Da Road., Chung-Li District, Tao-Yuan City, 32001, Taiwan.
Graduate Institute of Environmental Engineering, National Central University, Taiwan, No. 300, Chung-Da Road., Chung-Li District, Tao-Yuan City, 32001, Taiwan.
Chemosphere. 2024 Oct;366:143540. doi: 10.1016/j.chemosphere.2024.143540. Epub 2024 Oct 13.
The increasing accumulation of waste polymethyl methacrylate (PMMA) plastics presents a significant environmental challenge, while the demand for renewable energy sources continues to rise. Thermochemical recycling is a prospective technique for converting waste plastics into high-value chemicals, both economically and environmentally. In this work, the catalytic pyrolysis of waste PMMA plastics over LaCaMgAlO nanosheets (NSs) catalyst is being investigated for its potential to produce hydrogen and carbon nanotubes (CNTs) in a two-stage fixed-bed reactor. The yield and purity of the gaseous products, as well as carbon deposition, concerning the effects of temperature during the catalysis process. Additionally, a small portion of LaCa was incorporated into the MgAlO composite in the pre-catalysts under investigation. Analyzing the physicochemical properties of the carbon nanomaterials that form provides valuable insights into the workings of different catalysts. It's noteworthy that LaCaMgAlO NSs showed such large yields of H (82.71 vol% H) and CNTs (388 mg g) at 750 °C. The LaCaMgAlO NSs catalyst's impressive ability to produce CNTs and H gas at high yields underscores its efficacy and potential for real-world catalytic pyrolysis applications. This study emphasizes the Nanocatalyst's potential for large-scale catalytic pyrolysis operations, providing a workable and efficient way of converting waste plastics into high-value products and renewable energy.
废聚甲基丙烯酸甲酯（PMMA）塑料的积累量不断增加，对环境造成了重大挑战，而对可再生能源的需求持续增长。热化学回收是一种有前途的技术，可以将废塑料转化为高价值的化学品，在经济和环境方面都具有优势。在这项工作中，研究了在 LaCaMgAlO 纳米片（NS）催化剂上催化废 PMMA 塑料的热解，以评估其在两段式固定床反应器中生产氢气和碳纳米管（CNT）的潜力。考察了催化过程中温度对气态产物产率和纯度以及积碳的影响。此外，在所研究的前催化剂中，有一小部分 LaCa 掺入到 MgAlO 复合材料中。分析形成的碳纳米材料的物理化学性质可以深入了解不同催化剂的工作原理。值得注意的是，LaCaMgAlO NS 在 750°C 时表现出高达 82.71 vol% H 和 388mg g CNTs 的高产量。LaCaMgAlO NS 催化剂能够以高收率生产 CNTs 和 H 气体，这突出了其在实际催化热解应用中的功效和潜力。这项研究强调了纳米催化剂在大规模催化热解操作中的潜力，为将废塑料转化为高价值产品和可再生能源提供了一种可行且高效的方法。
