Thermochemical conversion pathways of Kappaphycus alvarezii granules through study of kinetic models

resumo

Kappaphycus alvarezii seaweed belongs to the class of red alga (Rhodophyta). The granules obtained after recovery of "sap" (liquid plant stimulant) from freshly harvested alga is a promising biomass feedstock for energy application. Herein we report the kinetic behaviour of the granules using thermogravimetric analysis (TGA) at different heating rates in N-2 atmosphere and thermogravimetric-mass spectrometry (TG-MS) analysis. Sawdust as lignocellulosic biomass is considered for comparative study. Four different kinetic models (i) multilinear regression technique, (ii) Friedman method, (iii) Flynn-Wall-Ozawa (FWO) method and (iv) Kissinger-Akahira-Sunose (KAS) method are used to evaluate the apparent activation energy (E-a), the pre-exponential factor (A alpha) and the overall reaction order (n). Maximum SO2 peak at 300 degrees C and 950 degrees C (from TG-MS), indicates that slow pyrolysis at 500 degrees C, with a packed bed lime scrubber at the outlet during temperature rise, is the best suited thermochemical pathway for energy harnessing. (C) 2017 Elsevier Ltd. All rights reserved.

palavras-chave

HYDROTHERMAL LIQUEFACTION; THERMOGRAVIMETRIC ANALYSIS; PYROLYSIS CHARACTERISTICS; NANNOCHLOROPSIS SP; ACTIVATION-ENERGY; BIOMASS; ALGAE; OIL; MICROALGAE; BIOFUELS

categoria

Agriculture; Biotechnology & Applied Microbiology; Energy & Fuels

autores

Das, P; Mondal, D; Maiti, S

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