Tyre-derived activated carbon – textural properties and modelling of adsorption equilibrium of n-hexane

Tomasz Piotr Kotkowski , Robert Cherbański , Eugeniusz Molga


There is general agreement that primary pyrolysis products of end-of-life tyres should be valorised to improve the economics of pyrolysis. In this work, tyre pyrolysis char (TPC) is produced in a pyrolysis pilot plant designed and built at our home university. The produced TPC was upgraded to tyre-derived activated carbon (TDAC) by activation with CO2, and then characterised using stereological analysis (SA) and nitrogen adsorption at 77 K. SA showed that the grains of TPC and TDAC were quasi- spherical and slightly elongated with a 25% increase in the mean particle cross-section surface area for TDAC. The textural properties of TDAC demonstrated the BET and micropore surface areas of 259 and 70 m2/g, respectively. Micropore volume and micropore surface area were 5.8 and 6.7 times higher for TDAC than TPC at  2 nm, respectively. The n-hexane adsorption was investigated using experiments and modelling. Eight adsorption isotherms along with three error functions were tested to model the adsorption equilibrium. The optimum sets of isotherm parameters were chosen by comparing sum of the normalized errors. The analysis indicated that the Freundlich isotherm gave the best agreement with the equilibrium experiments. In relation to different activated carbons, the adsorption capacity of TDAC for n-hexane is about 16.2 times higher than that of the worst reference material and 4.3 times lower than that of the best reference material. In addition, stereological analysis showed that activation with CO2 did not change the grain’s shape factors. However, a 25% increase in the mean particle cross-section surface area for TDAC was observed.
Author Tomasz Piotr Kotkowski (FCPE / DPKT)
Tomasz Piotr Kotkowski,,
- Department of Process Kinetics and Thermodynamics
, Robert Cherbański (FCPE / DPKT)
Robert Cherbański,,
- Department of Process Kinetics and Thermodynamics
, Eugeniusz Molga (FCPE / DPKT)
Eugeniusz Molga,,
- Department of Process Kinetics and Thermodynamics
Journal seriesChemical and Process Engineering , [Inżynieria Chemiczna i Procesowa, Chemical and Process Engineering - Inzynieria Chemiczna i Procesowa, Inzynieria Chemiczna, Chemical and Process Engineering - Inżynieria Chemiczna i Procesowa], ISSN 0208-6425, e-ISSN 2300-1925, [0368-0878]
Issue year2020
Publication size in sheets0.95
Keywords in Englishadsorption, n-hexane, tyre-derived activated carbon, Pyrolysis, tyres
ASJC Classification1500 General Chemical Engineering; 1600 General Chemistry
URL http://journals.pan.pl/dlibra/publication/130221/edition/113704/content
Languageen angielski
Score (nominal)40
Score sourcejournalList
ScoreMinisterial score = 40.0, 07-08-2020, ArticleFromJournal
Publication indicators WoS Citations = 0; Scopus SNIP (Source Normalised Impact per Paper): 2018 = 0.608; WoS Impact Factor: 2018 = 0.759 (2) - 2018=0.822 (5)
Citation count*1 (2020-08-27)
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