Kinetics of the Thermal Degradation of Rice Husks in Nitrogen Atmosphere

Mansaray, A. E. Ghaly K. G.

doi:10.1080/00908319950014335

Cited by 31 publications

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“…As illustrated, the nine hemicellulose fractions began to decompose at significant rates when the temperature was higher than 187 C. The variations in initial degradation temperatures were related to the differences in the elemental and chemical compositions of the samples (Mansaray and Ghaly 1999). The peak temperatures at maximum rate of weight loss occurred at 253, 284, 275, 267, 276, 263, 260, 263, and 275 C for BHW, BH1, BH2, BH3, BH4, BH5, BH6, BH7, and BH8, respectively (Fig.…”

Section: Thermal Analysismentioning

confidence: 95%

Fractionation and thermal characterization of hemicelluloses from bamboo (Phyllostachys pubescens Mazel) culm

Peng

et al. 2011

BioRes

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Water-soluble hemicelluloses and eight alkali-soluble hemicelluloses were fractionated from bamboo (Phyllostachys pubescens Mazel) culm with hot distilled water, 2% NaOH, 2% KOH, 5% NaOH, and 5% KOH aqueous solution. The chemical structures, as analyzed employing FTIR spectrometry, suggested that all the hemicelluloses were likely to be comprised of arabinoxylans associated with lignin more or less. Thermal analysis for hemicelluloses was carried out using TG-DTG method under nitrogen atmosphere at a heating rate of 10 °C/min, and first-order kinetics was evaluated. The major pyrolysis was focused at 187-346 °C, with activation energy ranging from 23.77 to 45.02 kJ/mol. The alkali-soluble fractions, being soluble in solution only at pH higher than 5.5, presented lower thermal stability and higher values of activation energy and pre-exponential factor than the alkali-soluble fractions remaining soluble in alkaline solution at pH lower than 5.5 and insoluble in ethanol. The chemical property of the hemicellulose fractions may greatly influence the thermal characteristics.

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Section: Thermal Analysismentioning

confidence: 95%

Fractionation and thermal characterization of hemicelluloses from bamboo (Phyllostachys pubescens Mazel) culm

Peng

et al. 2011

BioRes

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“…They noted that the degradation of hemicellulose and cellulose showed the highest mass loss rate at 268 • C and 355 • C, respectively, and lignin was the most difficult of the three to disintegrate [60,61]. According to Mansaray et al [71], the hemicellulose and cellulose constituents are the primary contributors to the evolution of volatile compounds, whereas the degradation of lignin leaves behind char particles as the direct product.…”

Section: Tga Analysis Of Biomass Fuelsmentioning

confidence: 99%

Extraction and Characterization of Biogenic Silica Obtained from Selected Agro-Waste in Africa

et al. 2021

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Increased amounts of available biomass residues from agricultural food production are present widely around the globe. These biomass residues can find essential applications as bioenergy feedstock and precursors to produce value-added materials. This study assessed the production of biogenic silica (SiO2) from different biomass residues in Africa, including cornhusk, corncob, yam peelings, cassava peelings and coconut husks. Two processes were performed to synthesize the biogenic silica. First, the biomass fuels were chemically pre-treated with 1 and 5% w/v citric acid solutions. In the second stage, combustion at 600 °C for 2 h in a muffle oven was applied. The characterization of the untreated biomasses was conducted using Inductively coupled plasma—optical emission spectrometry (ICP-OES), thermal analysis (TG-DTA) and Fourier-transform infrared spectroscopy (FTIR). The resulting ashes from the combustion step were subjected to ICP, nitrogen physisorption, Energy dispersive X-ray spectroscopy (EDX) as well as X-ray diffraction (XRD). ICP results revealed that the SiO2 content in the ashes varies between 42.2 to 81.5 wt.% db and 53.4 to 90.8 wt.% db after acidic pre-treatment with 1 and 5 w/v% acid, respectively. The relative reductions of K2O by the citric acid in yam peel was the lowest (79 wt.% db) in comparison to 92, 97, 98 and 97 wt.% db calculated for corncob, cassava peel, coconut husk and cornhusk, respectively. XRD analysis revealed dominant crystalline phases of arcanite (K2SO4), sylvite (KCl) and calcite (CaCO3) in ashes of the biomass fuels pre-treated with 1 w/v% citric acid due to potassium and calcium ions present. In comparison, the 5 w/v% citric acid pre-treatment produced amorphous, biogenic silica with specific surface areas of up to 91 m2/g and pore volumes up to 0.21 cm3/g. The examined biomass residues are common wastes from food production in Africa without competition in usage with focus application. Our studies have highlighted a significant end-value to these wastes by the extraction of high quality, amorphous silica, which can be considered in applications such as catalyst support, construction material, concrete and backing material.

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Utilization of Rice Husks and the Products of Its Thermal Degradation as Fillers in Polymer Composites

Genieva

Turmanova²,

Vlaev³

2011

Cellulose Fibers: Bio- And Nano-Polymer Composites

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Kinetics of the Thermal Degradation of Rice Husks in Nitrogen Atmosphere

Cited by 31 publications

References 0 publications

Fractionation and thermal characterization of hemicelluloses from bamboo (Phyllostachys pubescens Mazel) culm

Fractionation and thermal characterization of hemicelluloses from bamboo (Phyllostachys pubescens Mazel) culm

Extraction and Characterization of Biogenic Silica Obtained from Selected Agro-Waste in Africa

Utilization of Rice Husks and the Products of Its Thermal Degradation as Fillers in Polymer Composites

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