Kinetics of thermal decomposition of phospholipids obtained from phosphate rock

Naktiyok, Jale; Bayrakçeken, Hatice; Özer, A. Kadir; Gülaboğlu, M. Şahin

doi:10.1016/j.fuproc.2013.05.007

Cited by 21 publications

(9 citation statements)

References 27 publications

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“…Table lists the common mechanism functions combining with Equations and , and the values of kinetic parameters of different chars under FWO and KAS methods at different heating rates for three PS chars are shown in Tables and . For the PS char‐873, it is clear that both of activation energies of F2 mechanism are 194.80 and 185.95 KJ/mol, which extremely approach to the average value of PS char‐873 ( E = 187.10 and 177.93 KJ/mol) in Table .…”

Section: Resultsmentioning

confidence: 99%

Effect of pyrolysis temperature on pine sawdust chars and their gasification reactivity mechanism with CO₂

Wei

Liu

Ren

et al. 2018

Asia-Pacific J Chem Eng

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The mechanism on CO 2 gasification reactivity of pine sawdust chars (PS chars) obtained from the different pyrolysis temperatures (873, 973, and 1073 K) is studied on the basis of nonisothermal thermogravimetric method. The order of gasification reactivity is PS char-873 > PS char-973 > PS char-1073. The effect of pyrolysis temperature is depicted by microstructure characterization, and the gasification reactivity is analyzed with nonisothermal kinetic models. The microstructure characterizations of chars are characterized by scanning electron micrograph, Brunauer-Emmett-Teller, Fourier transform infrared, and X-ray diffraction. Results show that the microcrystalline structure of biomass char is the dominant factor for the effect of gasification reactivity with the pyrolysis temperature rising. The kinetic models of Flynn-Wall-Ozawa and Kissinger-Akahira-Sunose are applied to describe the kinetics of gasification process.The average values of activation energy are in close agreement with the two methods. Both of the methods prove that F2 mechanism is applicable to the gasification of PS chars at lower pyrolysis temperature and F1 mechanism at higher pyrolysis temperature. Besides, there is a compensation effect between activation energy and preexponential factor in the CO 2 gasification process.

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Section: Resultsmentioning

confidence: 99%

Effect of pyrolysis temperature on pine sawdust chars and their gasification reactivity mechanism with CO₂

Wei

Liu

Ren

et al. 2018

Asia-Pacific J Chem Eng

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“…Furthermore, calcium was mainly identified in the crystalline form of calcite (CaCO 3 ). Additionally, the presence forms of alkali earth metals (such as Ca and Mg) with relatively high content are likely to be metal cation ions connected with oxygen functional groups [28]. Besides, the composition results indicate that the SiO 2 content occupies an absolutely dominant position in the composition.…”

Section: Mass Spectroscopy Analysismentioning

confidence: 95%

“…FWO method is an integral iso-conversional technique, which involves taking logarithms of both sides of Equation (4), and integrating these with respect to α and T variables and using the approximation of Doyle the following expression is obtained [28]:…”

Section: Kinetic Modelsmentioning

confidence: 99%

Analytical Pyrolysis Study of Peanut Shells using TG-MS Technique and Characterization for the Waste Peanut Shell Ash

Yao¹,

Xu²,

Liang³

2016

JRST

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ABSTRACT:As an agricultural waste produced from the processing of peanut, the yield of peanut shells in China is quite abundant. Although numerous studies on the pyrolysis of peanut shells have been carried out, most of them were focused on the dynamics models for predicting kinetics parameter of biomass, and rarely on the evolution of gaseous products in pyrolysis. This study carried out a set of experiments on the pyrolysis of peanut shells under different heating rates in order to fill the knowledge gap. Besides, there is also a lack of information available concerning the characterization of resulting peanut shell ash. Thus, the aim of this study is to investigate the pyrolysis behaviors of peanut shells thoroughly and to characterize the properties of peanut shell ash that serves as predictors for its applications. The results show that the decomposition of peanut shells follows a stepwise mechanism, and the activation energy calculated by FlynnWall-Ozawa method varies from 58.3 to 88.6 kJ·mol -1 . Compared with low heating rate, fast heating rate at low temperatures is more suitable for biogas production. Chemical and phase analysis shows that peanut shell ash has a high SiO 2 content except for other oxides (K 2 O, CaO, MgO, Al 2 O 3 , etc.) that quite suitable in glass production, implying its potential for glass production and as a mineral admixture in concrete. Released volatile matters in pyrolysis create many pores in carbonaceous materials, thus low-cost adsorbents can be produced from these carbon residues.

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“…At a constant conversion, the plot of ln⁡ β versus 1/ T obtained at several heating rates is approximated to be a straight line whose slope allows evaluation of the activation energy. The intercept can be obtained from the straight line and assumed to be first order of reaction from f ( x ) = (1 − x ), and g ( x ) = −ln⁡(1 − x ), and second order of reaction from f ( x ) = (1− x ) 2 and g ( x ) = (1− x ) −1 − 1, and third order of reaction from f ( x ) = (1− x ) 3 and g ( x ) = 0.5⌊(1− x ) −2 − 1⌋ [ 27 – 29 ].…”

Section: Methodsmentioning

confidence: 99%

Nonisothermal Thermogravimetric Analysis of Thai Lignite with High CaO Content

Pintana

Tippayawong

2013

The Scientific World Journal

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Thermal behaviors and combustion kinetics of Thai lignite with different SO3-free CaO contents were investigated. Nonisothermal thermogravimetric method was carried out under oxygen environment at heating rates of 10, 30, and 50°C min−1 from ambient up to 1300°C. Flynn-Wall-Ozawa (FWO) and Kissinger-Akahira-Sunose (KAS) methods were adopted to estimate the apparent activation energy (E) for the thermal decomposition of these coals. Different thermal degradation behaviors were observed in lignites with low (14%) and high (42%) CaO content. Activation energy of the lignite combustion was found to vary with the conversion fraction. In comparison with the KAS method, higher E values were obtained by the FWO method for all conversions considered. High CaO lignite was observed to have higher activation energy than the low CaO coal.

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Kinetics of thermal decomposition of phospholipids obtained from phosphate rock

Cited by 21 publications

References 27 publications

Effect of pyrolysis temperature on pine sawdust chars and their gasification reactivity mechanism with CO₂

Effect of pyrolysis temperature on pine sawdust chars and their gasification reactivity mechanism with CO₂

Analytical Pyrolysis Study of Peanut Shells using TG-MS Technique and Characterization for the Waste Peanut Shell Ash

Nonisothermal Thermogravimetric Analysis of Thai Lignite with High CaO Content

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Kinetics of thermal decomposition of phospholipids obtained from phosphate rock

Cited by 21 publications

References 27 publications

Effect of pyrolysis temperature on pine sawdust chars and their gasification reactivity mechanism with CO2

Effect of pyrolysis temperature on pine sawdust chars and their gasification reactivity mechanism with CO2

Analytical Pyrolysis Study of Peanut Shells using TG-MS Technique and Characterization for the Waste Peanut Shell Ash

Nonisothermal Thermogravimetric Analysis of Thai Lignite with High CaO Content

Contact Info

Product

Resources

About

Effect of pyrolysis temperature on pine sawdust chars and their gasification reactivity mechanism with CO₂

Effect of pyrolysis temperature on pine sawdust chars and their gasification reactivity mechanism with CO₂