Thermochemical Valourization of Corn Cob Biomass Waste: Thermogravimetric Analysis and Pyrolysis Studies

IJEP 42(10): 1155-1166 : Vol. 42 Issue. 10 (October 2022)

M.Y. Guida1*, B. Rebbah1, N. Anter1, A. Chennani1, A. Medaghri-Alaoui1,2, E. M. Rakib1,3 and A. Hannioui1,2

1. University of Sultan Moulay Slimane (USMS), Organic Chemistry and Analytical Laboratory (LCOA), Faculty of Sciences and Techniques (FST), 23000, Beni-Mellal, Morocco
2. University of Sultan Moulay Slimane (USMS), Department of Chemistry and Environment, Faculty of Sciences and Techniques (FST), 23000, Beni-Mellal, Morocco
3. University of Sultan Moulay Slimane (USMS), Higher School of Technology, EST-Fkih Ben Saleh, 23000, Beni-Mellal, Morocco


In present study, decomposition analysis and pyrolysis studies of corn cob biomass waste were carried out using thermogravimetric analysis (TGA) and stainless steel tubular reactor. Thermal degradation of corn cob was examined at different heating rates ranging from 2-20°C/min (2, 5, 10 and 20°C/min) in inert atmosphere between 20°C and 900°C. Friedman (FR) and Vyazovkin (VYA) methods were used to determine activation energy values for pyrolysis of hemicellulose, cellulose and lignin. Pyrolysis experiments were carried out in a stainless steel tubular reactor from 200-700°C with a heating rate of 5°C/min, a particle size of 0.2-0.4 mm and nitrogen flow rate of 100 mL/min, which the aim to study how temperature affects bio-oil, bio-char and gas products. Bio-oil and bio-char products were characterized by elemental analysis, FTIR, NMR, XRD and column chromatography. The results of this work showed that three stages have been identified in the thermal decomposition of corn cob biomass. The apparent activation energies obtained for decomposition of hemicellulose, cellulose and lignin original from corn cob were given as 151.45-172.4 KJ/mol, 204-235.87 KJ/mol and 234.45-245.8 KJ/mol, respectively. It was concluded that temperature has a significant effect on product yields. The maximum bio-oil yield of 45.6 wt% was obtained at a pyrolysis temperature of 500°C. Solid and liquid products obtained were characterized by elemental analysis, Fourier transformed infrared spectroscopy (FTIR), nuclear magnetic resonance spectroscopy (NMR), x-ray diffraction (XRD) and column chromatography. The analysis of liquid and solid products showed that bio-oil and bio-char from corn cob biomass could be a prospective source of renewable fuel production and values added chemical products.


Corn cob biomass, Thermogravimetric analysis, Pyrolysis, Bio-oil, Bio-char


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