Debromination of Pyrolytic oil from waste printed circuit boards by catalytic thermo chemical reactions with Ca(OH)2 and ZSM-5

IF 5.8 2区生物学 Q1 AGRICULTURAL ENGINEERING

Biomass & Bioenergy Pub Date : 2024-09-19 DOI:10.1016/j.biombioe.2024.107382

Shina Gautam , Vaibhav Pandere , Alok Gautam

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Abstract

The surge in Waste Electrical and Electronic Equipment (WEEE) volume presents a formidable disposal challenge. This study focused on catalytic pyrolysis of waste printed circuit boards (WPCBs) employing Ca(OH)₂ alone and in conjunction with ZSM-5 as catalysts. Kinetic parameters for catalytic and non-catalytic pyrolysis were derived through thermogravimetric analysis (TGA). The Coats-Redfern method for non-catalytic pyrolysis showcased activation energies of 33.52, 405.81, and 67.96 kJ/mol in zones 1, 2, and 3, respectively with corresponding reaction orders of 0.9, 2.8, and 1.2. Introduction of Ca(OH)₂ amplified activation energy and reaction order in zones 2 and 3. Subsequent incorporation of ZSM-5 with Ca(OH)₂ resulted in reduced activation energy and reaction order in zone 2, while elevating them in zones 1 and 3. Validation through laboratory-scale fixed-bed reactor experiments confirmed TGA findings and unveiled that pyrolysis oil had enhanced phenolic yield because of ZSM-5 where Ca(OH)₂ showcased its effectiveness in eliminating halogens.

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通过 Ca（OH）2 和 ZSM-5 的催化热化学反应对废印刷电路板中的热解油进行脱溴处理

废弃电子电气设备（WEEE）数量的激增给处理工作带来了严峻的挑战。本研究的重点是单独使用 Ca(OH)2 和 ZSM-5 作为催化剂，对废弃印刷电路板（WPCB）进行催化热解。通过热重分析（TGA）得出了催化热解和非催化热解的动力学参数。非催化热解的 Coats-Redfern 方法显示，1、2 和 3 区的活化能分别为 33.52、405.81 和 67.96 kJ/mol，相应的反应阶数分别为 0.9、2.8 和 1.2。Ca(OH)2 的引入扩大了 2 区和 3 区的活化能和反应顺序。随后加入 Ca(OH)2 的 ZSM-5 使 2 区的活化能和反应阶数降低，而 1 区和 3 区的活化能和反应阶数升高。通过实验室规模的固定床反应器实验进行验证，证实了 TGA 的发现，并揭示了热解油因 ZSM-5 而提高了酚类产量，其中 Ca(OH)2 显示了其消除卤素的功效。

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来源期刊

Biomass & Bioenergy 工程技术-能源与燃料

CiteScore

11.50

自引率

3.30%

发文量

258

审稿时长

60 days

期刊介绍： Biomass & Bioenergy is an international journal publishing original research papers and short communications, review articles and case studies on biological resources, chemical and biological processes, and biomass products for new renewable sources of energy and materials. The scope of the journal extends to the environmental, management and economic aspects of biomass and bioenergy. Key areas covered by the journal: • Biomass: sources, energy crop production processes, genetic improvements, composition. Please note that research on these biomass subjects must be linked directly to bioenergy generation. • Biological Residues: residues/rests from agricultural production, forestry and plantations (palm, sugar etc), processing industries, and municipal sources (MSW). Papers on the use of biomass residues through innovative processes/technological novelty and/or consideration of feedstock/system sustainability (or unsustainability) are welcomed. However waste treatment processes and pollution control or mitigation which are only tangentially related to bioenergy are not in the scope of the journal, as they are more suited to publications in the environmental arena. Papers that describe conventional waste streams (ie well described in existing literature) that do not empirically address ''new'' added value from the process are not suitable for submission to the journal. • Bioenergy Processes: fermentations, thermochemical conversions, liquid and gaseous fuels, and petrochemical substitutes • Bioenergy Utilization: direct combustion, gasification, electricity production, chemical processes, and by-product remediation • Biomass and the Environment: carbon cycle, the net energy efficiency of bioenergy systems, assessment of sustainability, and biodiversity issues.