Energies 2012, 5(9), 3295-3306; doi:10.3390/en5093295
Article

Kinetic Study of the Pyrolysis of Waste Printed Circuit Boards Subject to Conventional and Microwave Heating

National Engineering Laboratory for Coal-fired Pollutants Emission Reduction, Energy and Power Engineering School, Shandong University, 17923 Jingshi Road, Jinan, Shandong 250061, China
* Author to whom correspondence should be addressed.
Received: 2 July 2012; in revised form: 8 August 2012 / Accepted: 24 August 2012 / Published: 31 August 2012
(This article belongs to the Special Issue Waste to Energy Technologies)
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Abstract: This paper describes a kinetic study of the decomposition of waste printed circuit boards (WPCB) under conventional and microwave-induced pyrolysis conditions. We discuss the heating rates and the influence of the pyrolysis on the thermal decomposition kinetics of WPCB. We find that the thermal degradation of WPCB in a controlled conventional thermogravimetric analyzer (TGA) occurred in the temperature range of 300 °C–600 °C, where the main pyrolysis of organic matter takes place along with an expulsion of volumetric volatiles. The corresponding activation energy is decreased from 267 kJ/mol to 168 kJ/mol with increased heating rates from 20 °C/min to 50 °C/min. Similarly, the process of microwave-induced pyrolysis of WPCB material manifests in only one stage, judging by experiments with a microwave power of 700 W. Here, the activation energy is determined to be only 49 kJ/mol, much lower than that found in a conventional TGA subject to a similar heating rate. The low activation energy found in microwave-induced pyrolysis suggests that the adoption of microwave technology for the disposal of WPCB material and even for waste electronic and electrical equipment (WEEE) could be an attractive option.
Keywords: kinetic study; microwave-induced pyrolysis; waste printed circuit boards (WPCB); activation energy

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MDPI and ACS Style

Sun, J.; Wang, W.; Liu, Z.; Ma, Q.; Zhao, C.; Ma, C. Kinetic Study of the Pyrolysis of Waste Printed Circuit Boards Subject to Conventional and Microwave Heating. Energies 2012, 5, 3295-3306.

AMA Style

Sun J, Wang W, Liu Z, Ma Q, Zhao C, Ma C. Kinetic Study of the Pyrolysis of Waste Printed Circuit Boards Subject to Conventional and Microwave Heating. Energies. 2012; 5(9):3295-3306.

Chicago/Turabian Style

Sun, Jing; Wang, Wenlong; Liu, Zhen; Ma, Qingluan; Zhao, Chao; Ma, Chunyuan. 2012. "Kinetic Study of the Pyrolysis of Waste Printed Circuit Boards Subject to Conventional and Microwave Heating." Energies 5, no. 9: 3295-3306.

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