Open AccessEffects of Algal Biomass Blending on Coal Decomposition Behaviour and Kinetics at Intermediate Pyrolysis Regimes
Author(s) -
Bothwell Nyoni,
Phuti Cedrick Tsipa,
Haleden Chiririwa,
Shanganyane Percy Hlangothi
Publication year - 2021
Publication title -
asian journal of chemistry/asian journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.145
H-Index - 34
eISSN - 0975-427X
pISSN - 0970-7077
DOI - 10.14233/ajchem.2021.23069
Subject(s) - pyrolysis , coal , kinetics , chemistry , decomposition , algae , biomass (ecology) , thermogravimetric analysis , chemical engineering , carbon fibers , pulp and paper industry , organic chemistry , botany , materials science , ecology , composite material , biology , physics , quantum mechanics , engineering , composite number
Co-pyrolysis of coal with biomass is becoming a popular method of reducing the net carbon dioxideemissions associated with the process. In present work, the pyrolysis of coal and algae was studiedusing thermogravimetric methods and the kinetics were analyzed using the Coats-Redfern integralmethod. The kinetics were evaluated for 1st and 2nd order reaction models. The effect brought byblending coal with algae on kinetics was studied via the analysis of pyrolysis of different coal-algaeblends. The results revealed that the pyrolysis of coal and algae follows 2nd and 1st order kinetics withactivation energy evaluated in the range 213.4-241.8 and 108.9-122.8 kJ/mol, respectively. It wasobserved that for coal-algae blending of 20-40% algae, intermediate pyrolysis, typical heating rates of50-200 ºC/min was characterized by two distinct stages (ignoring the drying stage) that correspond tothe individual decomposition of algae and coal. However, there was an evidence of coal-algaeinteractions during co-pyrolysis, which made the kinetics of the two distinct stages not to correspondto the kinetics of the individual materials.