Kinetic modelling and measurement of catalyst deactivation for the catalytic co-pyrolysis of PP and PET with HZSM-5

IF 4.8 2区化学 Q2 CHEMISTRY, PHYSICAL

Applied Catalysis A: General Pub Date : 2025-09-20 DOI:10.1016/j.apcata.2025.120574

Sean Timothy Okonsky , J.V. Jayarama Krishna , Do Hyun Lee , Hilal Ezgi Toraman

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引用次数: 0

Abstract

The catalytic pyrolysis and co-pyrolysis of PP and PET with HZSM-5 zeolite catalyst was conducted for various catalyst to feedstock (CF) ratios, PP to PET ratios, and heating rates using a thermogravimetric analyzer (TGA). The Flynn-Wall-Ozawa (FWO) isoconversional approach was used to determine apparent activation energies for the non-catalytic and catalytic pyrolysis of PP and PET. An n^th-order reaction scheme was used to model the pyrolysis at various operating conditions through the optimization of the associated kinetic parameters. Additional TGA experiments were conducted with used catalysts to gain insight into catalyst deactivation, and it was found that the inclusion of PET led to more severe deactivation. Collidine temperature programmed desorption (TPD) indicated the loss of external acid sites for catalysts coked by PET pyrolysis, explaining the severe deactivation. Catalyst deactivation was incorporated into the kinetic modelling approach, so that degradation profiles could be predicted for experiments with the used catalysts.

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HZSM-5催化共热解PP和PET催化剂失活的动力学建模和测定

采用热重分析仪（TGA）对HZSM-5沸石催化剂在不同催化剂与原料（CF）比、PP与PET比和升温速率下的PP和PET的催化热解和共热解进行了研究。采用Flynn-Wall-Ozawa （FWO）等转化法测定了PP和PET非催化热解和催化热解的表观活化能。通过对相关动力学参数的优化，采用n级反应模式模拟了不同操作条件下的热解过程。为了进一步了解催化剂失活的原因，我们对使用过的催化剂进行了额外的TGA实验，发现PET的加入导致了更严重的失活。碰撞温度程序解吸（TPD）表明，PET热解焦化催化剂的外部酸位损失，解释了严重的失活。催化剂失活被纳入动力学建模方法，因此可以用所用催化剂的实验预测降解曲线。

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来源期刊

Applied Catalysis A: General 化学-环境科学

CiteScore

9.00

自引率

5.50%

发文量

415

审稿时长

24 days

期刊介绍： Applied Catalysis A: General publishes original papers on all aspects of catalysis of basic and practical interest to chemical scientists in both industrial and academic fields, with an emphasis onnew understanding of catalysts and catalytic reactions, new catalytic materials, new techniques, and new processes, especially those that have potential practical implications. Papers that report results of a thorough study or optimization of systems or processes that are well understood, widely studied, or minor variations of known ones are discouraged. Authors should include statements in a separate section "Justification for Publication" of how the manuscript fits the scope of the journal in the cover letter to the editors. Submissions without such justification will be rejected without review.