Characteristics and kinetic studies of Hydrilla verticillata pyrolysis via thermogravimetric analysis

Hu, Zhiquan; Chen, Zhihua; Li, Genbao; Chen, Xiaojuan; Hu, Mian; Laghari, Muhammad Younis; Wang, Xun; Guo, Dabin

doi:10.1016/j.biortech.2015.07.007

Cited by 36 publications

(14 citation statements)

References 33 publications

(47 reference statements)

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“…According to the energy compensation effect equation, eq. (5), compensation effect coefficients, a and b, i. e. the slope and intercept were obtained from the corresponding equation [23]. Therefore, the energy compensation effect equations of olive waste untreated and treated were lnA = 0.49E a -15.49 (R 2 = 0.9913), and lnA = 0.42E a -13.54 (R 2 = 0.9930), respectively.…”

Section: Kinetic Analysis Using Cr Methodsmentioning

confidence: 99%

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Thermal decomposition kinetics of raw and treated olive waste

Wang

Peng

2019

THERM SCI

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The pyrolysis characteristic of raw and ultrasound assisted enzyme hydrolysis treated (UAEH) olive waste was investigated using the thermogravimetric analysis at 5, 10, 15, and 20 °C per minute in the nitrogen atmosphere. The thermal decomposition was divided into three stages in the thermograph curve, and the thermogravimetric curve showed the same decomposition trend for two samples. The temperature interval and peak temperature were different for two different samples, and moved to higher temperature with the increase in heating rate. Differential thermogravimetric and differential scanning calorimetry curves depicted that the structure and composition of samples were changed by UAEH. Meanwhile, the kinetic parameters were calculated by the Kissinger, Kissinger-Akahira-Sunose, Flynn-Wall-Ozawa, and Coats-Redfern methods. For untreated and treated olive waste, the Kissinger-Akahira-Sunose and Flynn-Wall-Ozawa methods revealed the similar kinetic characteristics for the conversion degree from 0.1 to 0.9, and the average values of activation energy were 201.42 kJ/mol and 162.97 kJ/mol, respectively. The change in activation energy was clearly dependent on the extent of conversion. The Coats-Redfern method suggested the second-order model (F 2 , f(α) = (1 -α) 2 ) could be used to better describe the thermal decomposition mechanism of untreated and treated olive waste. Besides, thermodynamic characteristics of olive waste treated were consistent with that of the untreated sample.

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Section: Kinetic Analysis Using Cr Methodsmentioning

confidence: 99%

“…Due to the energy compensation effects, the variation between activation energy and pre-exponential factor must be considered [23,24]. The equation was given:…”

Section: Geometrical Contractionmentioning

confidence: 99%

Thermal decomposition kinetics of raw and treated olive waste

Wang

Peng

2019

THERM SCI

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“…The function of

f (α_{i})

represents the reaction mechanism function, which expresses the dependence of conversion rate on the conversion ratio. On the basis of mechanistic assumptions, functions are divided into nucleation, geometrical contraction, diffusion, or reaction‐order . The reaction‐order mechanism function is widely used to describe the thermal decomposition process of biomass materials ,

f true(α_{i} true) = {true(1 - α_{i} true)}^{n_{i}},

where n i is the reaction order of component i .…”

Section: Methodsmentioning

confidence: 99%

“…On the basis of mechanistic assumptions, functions are divided into nucleation, geometrical contraction, diffusion, or reaction‐order . The reaction‐order mechanism function is widely used to describe the thermal decomposition process of biomass materials ,

f true(α_{i} true) = {true(1 - α_{i} true)}^{n_{i}},

where n i is the reaction order of component i . Under nonisothermal conditions, where the heating rate is known, the reaction temperature can be related to time,

T = T_{0} + β t,

where

T_{0}

and β are the initial temperature and the heating rate, respectively.…”

Section: Methodsmentioning

confidence: 99%

Kinetic analysis of cattle manure pyrolysis process with a novel two‐step method: Pseudo‐component model coupled with multipeak gaussian fitting

Xin

Cao

Yuan

et al. 2017

Env Prog and Sustain Energy

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A novel two‐step method is proposed to conduct the pseudo‐component model for cattle manure pyrolysis process. The weight coefficient of pseudo‐components firstly are identified accurately by Gaussian multipeak fitting method based on the DTG data of cattle manure, and then the kinetic parameters for each pseudo‐component including reaction order, activation energies (Ei) and pre‐exponential factor (Ai), are obtained by the reaction‐order mechanism function and Coats‐Redfern method. The results showed that the decomposition process of cattle manure should be characterized by five pseudo‐components (extractives, hemicellulose, cellulose, lignin, and volatilizable carbonaceous materials). The corresponding reaction orders were 1.6, 1.8, 1.9, 1.3, and 1.8, respectively. The Ei were ranged from 42.54 to 527.02 kJ mol−1 for five pseudo‐components. The pseudo‐component model coupled with multipeak Gaussian fitting could describe the kinetic process of cattle manure decomposition very well, and provide useful data for the design of a thermal decomposition processing system and the kinetic analysis of pyrolysis process of other solid wastes. © 2017 American Institute of Chemical Engineers Environ Prog, 37: 1618–1625, 2018

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“…21 The non-isothermal TGA method has been widely applicable in the kinetic analyses of different biomass pyrolyses such as corn straw, karanj fruit hulls, rice husk, smooth cordgrass, hazelnut husk and Hydrilla verticillata. 14,[22][23][24]25,26 Durian (scientific name Durio zibethinus L.; family Bombacaceae), is a seasonal fruit that is most popular in Southeast Asia, particularly in Malaysia, Indonesia, Thailand and the Philippines. 27 The tree grows up to 40 m in height with a typical buttressed trunk and 3-7 cm long oblong or elliptical dark green leaves.…”

Section: Introductionmentioning

confidence: 99%

Kinetics of Pyrolysis of Durian (Durio zibethinus L.) Shell Using Thermogravimetric Analysis

Tan¹,

Ahmed²,

Hummadi³

et al. 2019

JPS

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The characteristics and kinetics of durian shell (DS) pyrolysis were investigated using non-isothermal thermogravimetric analysis (TGA). DS is a celluloserich biomass with high volatile matters content, which is suitable for bio-oil production. Thermal decomposition experiments were performed under nitrogen flow at various heating rates (i.e., 5°C min -1 , 10°C min -1 and 20°C min -1 ). The model-fitting method represented by Coats-Redfern was applied on the experimental TGA data of DS pyrolysis. The decomposition of DS was divided into three stages: first stage (59°C-200°C) involved removal of moisture and light volatiles; second stage (200°C-400°C) showed decomposition of cellulose and hemicellulose; and third stage (above 400°C) presented lignin decomposition. There was 56% weight loss observed in second stage, revealing that decomposition of cellulose and hemicellulose contributed the most on volatile production. The model shows that the activation energy was between 42.08 kJ mol -1 and 84.40 kJ mol -1 for the second stage of the pyrolytic process from 200°C to 400°C using different decomposition mechanisms. The Coats-Redfern method is applied successfully for the correlation of experimental TGA data with an average correlation coefficient (R 2 ) of 0.991 while one-way diffusion model D1 gave the highest correlation coefficient of 0.998. DS biomass is a suitable raw material for energy or chemicals production.

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Characteristics and kinetic studies of Hydrilla verticillata pyrolysis via thermogravimetric analysis

Cited by 36 publications

References 33 publications

Thermal decomposition kinetics of raw and treated olive waste

Thermal decomposition kinetics of raw and treated olive waste

Kinetic analysis of cattle manure pyrolysis process with a novel two‐step method: Pseudo‐component model coupled with multipeak gaussian fitting

Kinetics of Pyrolysis of Durian (Durio zibethinus L.) Shell Using Thermogravimetric Analysis

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