Journal
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
Volume 111, Issue -, Pages 200-208Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jaap.2014.11.009
Keywords
Pyrolysis; Waste tire; Sulfur; Copper; Petrochemical
Funding
- Petroleum and Petrochemical College, Chulalongkorn University
- Center of Excellence on Petrochemical and Materials Technology
- Thailand Research Fund (TRF) [RSA5680021]
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Metal-loaded zeolites are potential catalysts for upgrading the quality and quantity of waste tire pyrolysis products. Acquired from metal and zeolite properties, the catalysts can exhibit multi-functions in catalysis, including hydrogenation, dehydrogenation, ring-opening, cracking, and aromatization. Cu is widely used in several applications such as selective hydrogenation of undesired unsaturated hydrocarbons in a mixed-C4 stream, and sulfur removal from liquid fuels. So, Cu was expected to be a promoter of zeolites for enhancing the quality of tire-derived oil in terms of sulfur removal and the increase in valuable petrochemicals in the oil. Therefore, the effect of Cu-support interaction on tire-derived oils, petrochemicals, and sulfur removal was studied using three types of zeolites (HBETA, H's' and HMOR) as supports at a 5 wt% Cu loading. Catalytic pyrolysis of waste tire was operated in a bench reactor, and GC x GC-TOF/MS and SIMDIST-GC instruments were used to analyze the liquid products for chemical compositions and petroleum fractions, respectively. Sulfur in the pyrolysis products was determined by using an S-analyzer, whereas the gas composition was analyzed by using a GC-FID. As a result, all Cu-promoted catalysts can reduce more sulfur content in oils than their pure zeolites; therefore, Cu was found to enhance desulfurization of oils by converting sulfur compounds into thermodynamically stable forms on Cu. Furthermore, Cu-support interaction highly affected the sulfur removal from oils. Interestingly, it was revealed that valuable petrochemicals highly produced by Cu/HY were benzene, ethylbenzene and cyclohexane whereas Cu/HMOR highly produced benzene, toluene and ethylbenzene. Cu/HBETA highly yielded benzene and ethylbenzene in the oil. It can be observed that benzene and ethylbenzene are common petrochemicals highly produced by the Cu-loaded catalysts. (C) 2014 Elsevier B.V. All rights reserved.
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