Open AccessHigh-value resource recovery products from waste tyres
Author(s) -
Ye Shui Zhang,
Chunfei Wu,
Mohamad A. Nahil,
Paul T. Williams
Publication year - 2016
Publication title -
proceedings of the institution of civil engineers - waste and resource management
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.481
H-Index - 17
eISSN - 1747-6534
pISSN - 1747-6526
DOI - 10.1680/jwarm.16.00001
Subject(s) - natural rubber , syngas , materials science , catalysis , heat of combustion , elastomer , yield (engineering) , waste management , pyrolysis , carbon fibers , chemical engineering , pulp and paper industry , composite material , organic chemistry , chemistry , combustion , composite number , engineering
A novel process has been developed which enables the production of high-value carbon nanotubes (CNTs) and hydrogen-rich syngas from the two-stage pyrolysis–catalysis of waste tyres. The waste tyre samples originated from truck tyres and from car tyres. In addition, three of the main rubber elastomers used in tyre manufacture, polybutadiene rubber, styrene–butadiene rubber and natural rubber, were also investigated. The waste car tyres produced a syngas yield of 30·2 wt%, which was composed largely of hydrogen (53·8 vol%) with a calorific value of 18·8 MJ/m3. Increasing the tyre:catalyst ratio increased the yield of hydrogen. The component rubber elastomers produced much higher yields of syngas and hydrogen gas concentration. The carbon deposited on the catalyst during reaction was found to be mostly composed of graphitic CNTs. Changing the process conditions in terms of tyre:catalyst ratio could increase the yield of the carbon deposited on the catalyst to up to 14 wt%.
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