Investigation of synergy and inhibition effects during co-gasification of tire char and biomass in CO 2 environment
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ORIGINAL ARTICLE
Investigation of synergy and inhibition effects during co-gasification of tire char and biomass in CO2 environment Pooya Lahijani 1
&
Maedeh Mohammadi 2
&
Abdul Rahman Mohamed 3
Received: 21 February 2020 / Revised: 15 September 2020 / Accepted: 24 September 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract This study investigates the co-gasification of tire char (TC), as a low-quality side-product of scrap tire pyrolysis, and rambutan peel (RP). The objective of this study was to comprehend any synergistic/antagonistic effects during the co-gasification of TC/ RP. For this, co-gasification of TC and RP (85:15, 70:30, 50:50, 30:70, and 15:85 wt% of TC:RP) was conducted in CO2 environment by non-isothermal thermogravimetric method. The samples were heated (15 K/min) under N2 to 923 K and then under CO2 to 1400 K. Comparison of the observed and theoretical results indicated the incidence of antagonism in blends with high proportion of TC (e.g., 85%TC–15%RP and 70%TC–30%RP), possibly attributing to the high content of acid oxides (SO3 (30.1%) and SiO2 (24.8%)) in the TC-ash which could inhibit the gasification by formation of inactive silicates in the presence of alkali/alkaline earth metal-rich biomass. In blends with higher content of biomass (e.g., 30%TC–70%RP and 15%TC–85%RP), the actual gasification rates were higher than the theoretically predicted ones showing the presence of a synergism associated with the natural catalysts (K2O (40.6%) and CaO (42.3%)) in RP-ash. Activation energy and thermodynamic studies confirmed the profound effect of biomass on enhancing the reactivity of TC in reaction with CO2. These promoting effects of biomass were associated with its considerably higher alkali index (133.4) than tire (5.6), its less graphitic structure with more structural defects, and imperfections compared with TC. According to the results, the inherently low reactivity of TC in gasification can be accelerated by co-feeding of biomass with TC. Keywords Tire char . Rambutan peel . CO2 co-gasification . Synergism . Antagonism . Activation energy
1 Introduction In the growing world that conventional energy sources are fast moving towards extinction, environmental issues are apparent and the volume and variety of wastes are increasing, while landfilling capacities are limited, there is a crucial need for Electronic supplementary material The online version of this article (https://doi.org/10.1007/s13399-020-01028-x) contains supplementary material, which is available to authorized users. * Abdul Rahman Mohamed [email protected] 1
School of Aerospace Engineering, Universiti Sains Malaysia, 14300 Nibong Tebal, Pulau Pinang, Malaysia
2
Faculty of Chemical Engineering, Babol Noshirvani University of Technology, Babol 47148, Iran
3
Low Carbon Economy (LCE) Research Group, School of Chemical Engineering, Universiti Sains Malaysia, 14300 Nibong Tebal, Pulau Pinang, Malaysia
strategies that could address these impacts for the existence of a future. In line with such strate
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