Study on the Thermochemical and Kinetic Characteristics of Alkali Treated Rice Husk

Abstract

The effective utilization of waste rice husk requires detailed studies on the kinetics and mechanism of their thermal and chemical treatment. The present work is a comparative study on the thermo-chemical and kinetic characteristics of thermal degradation of raw and treated with NaOH rice husk. The optimal conditions for extraction of SiO 2 from rice husk in the form of Na 2 SiO 3 were determined using thermal analysis (TA), scanning electron microscope (SEM) and elemental analysis. The experiments were carried out under conditions of non-isothermal heating in air and nitrogen atmosphere. Using different kinetic models, the values of the effective kinetic parameters, characterizing the destruction process were determined.

Non-isothermal kinetic study of de-oiled seeds cake of African star apple ( Chrosophyllum albidum ) using thermogravimetry

“…Thus, high degree of endothermicity could affect the activity of primary reaction in pyrolysis. The ΔS value obtained at lower heating rate for the degradation is negative, which indicates that formation of activated complex is accompanied by decrease in entropy, this implies that activated complex has a more ordered structure than the reactants and that the reactions are slower than normal ( Markovska et al, 2010 ; Aravindakshan and Muraleedharan, 1990 ). The ΔS values obtained at heating rates of 10–40 °C/min were positive.…”

Kinetic parameters of red pepper waste as biomass to solid biofuel

“…According (Markovska et al, 2010), values of the activating energy found on the range of 60-120 kJ/mol are comparatively low. These values indicate that higher activation energy is only needed to decompose biomass with higher lignin content (Burhenne et al, 2013).…”

“…The initial activation energy value was considered low due to cleavage of some weak bonds and elimination of volatile components from the biomass because at the beginning of the process all the strong bonds are not cleaved (Gašparoviè, 2012;Markovska et al, 2010).…”

Influence of fungal pretreatment on thermogravimetric characteristics and fast pyrolysis vapors of corn stover

“…The Arrhenius equation, Coats and Redfern's integral method are used to determine the kinetic parameters from the data of TG and DTG curves between 200 and 400°C, with maximal weight loss, which was considered to be the range of basic destruction [30]. The integral equation can be calculated as the following according to Yang et al [21]:…”