Catalytic Pyrolysis of Waste Flat-Panel Display Plastics for Valuable Hydrocarbons

IF 2.8 4区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

ChemPlusChem Pub Date : 2025-08-13 DOI:10.1002/cplu.202500283

Lucie Oravová, Jan Snow, Ivana Barchánková, Matouš Kloda, Daniel Bůžek, Pavel Kuráň

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Abstract

Catalytic pyrolysis of waste flat-panel display (FPD) plastics and pure polystyrene (PS), which is the main polymer component in FPD waste, is conducted at 500 °C in a micropyrolysis reactor to enhance benzene, toluene, ethylbenzene, and xylene (BTEX) production and eliminate styrene and heteroatom compounds in pyrolysis products. A comparative study with PS reveals similar product distributions, indicating that FPD waste additives do not significantly impede the catalytic reactions. Zeolitic catalysts (HZSM-5, Hβ, and HY) effectively reduce nitrogen- and oxygen-containing compounds and also styrene with increase in BTEX and polycyclic aromatic hydrocarbons (PAHs) yields. Even at a feed:catalyst ratio of 1:1, distinct product distributions are observed compared to the noncatalytic run. In the presence of Hβ, benzene is the main compound, exhibiting a 22% increase. With HY, ethylbenzene is the dominant product, showing a 36% increase. Notably, HY, which possesses the highest concentration of Brønsted acid sites with minimum of Lewis acid sites together with the largest pore size among the studied zeolites, preferentially enhances the formation of ethylbenzene within the BTEX.

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废平板显示塑料的催化热解制备有价烃类。

在微热解反应器中，对废旧平板显示器（FPD）塑料和FPD废弃物中主要聚合物组分纯聚苯乙烯（PS）进行500℃的催化热解，提高苯、甲苯、乙苯和二甲苯（BTEX）的产量，消除热解产物中的苯乙烯和杂原子化合物。通过与PS的对比研究，发现产物分布相似，表明FPD废添加剂对催化反应没有明显的阻碍作用。沸石催化剂（HZSM-5、Hβ和HY）能有效还原含氮、含氧化合物和苯乙烯，并能提高BTEX和多环芳烃（PAHs）的收率。即使在进料：催化剂比例为1:1时，与非催化运行相比，也可以观察到不同的产物分布。在Hβ存在下，苯是主要化合物，增加了22%。在HY中，乙苯是主要产物，增加了36%。值得注意的是，在所研究的沸石中，具有最高Brønsted酸位点浓度和最少Lewis酸位点以及最大孔径的HY，优先促进了BTEX内乙苯的形成。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

ChemPlusChem CHEMISTRY, MULTIDISCIPLINARY-

CiteScore

5.90

自引率

0.00%

发文量

200

审稿时长

1 months

期刊介绍： ChemPlusChem is a peer-reviewed, general chemistry journal that brings readers the very best in multidisciplinary research centering on chemistry. It is published on behalf of Chemistry Europe, an association of 16 European chemical societies. Fully comprehensive in its scope, ChemPlusChem publishes articles covering new results from at least two different aspects (subfields) of chemistry or one of chemistry and one of another scientific discipline (one chemistry topic plus another one, hence the title ChemPlusChem). All suitable submissions undergo balanced peer review by experts in the field to ensure the highest quality, originality, relevance, significance, and validity.