Thermal and thermomechanical behavior of Moroccan Boufeggous variety date seeds

Abbari, Hafsa El; Bentahar, Sarah; Marouani, Maryam El; Taïbi, M.; Zeriouh, A.; Sebbahi, Saloua; Kifani‐Sahban, Fatima

doi:10.1007/s10973-019-08060-8

Cited by 6 publications

(3 citation statements)

References 13 publications

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“…The SEM characterization (Figure 6) of raw date seeds (RDS), roasted date seeds at 233 (RoDS) and 243 (RoDS2), and carbonized date seeds at 400 °C (CDS), obtained by heat treatment in a fixed bed under a nitrogen flow rate of 60 cm 3 min −1 with a heating rate of 5 °C min −1 on the date seeds in powder indicates the formation and the development of a plastic phase according to fracture mechanics concepts. These principles stipulate that thermal treatment, which leads to matter devolatilization, generates internal friction and reorganizations in the structure of the material (Details of thermal treatment are given in our previous publications) [33,34] …”

Section: Resultsmentioning

confidence: 99%

“…principles stipulate that thermal treatment, which leads to matter devolatilization, generates internal friction and reorganizations in the structure of the material (Details of thermal treatment are given in our previous publications). [33,34] These frictions require an energy supply, which is stored in the structure until it breaks. [33,35] SEM image (b) shows a net appearance of cracks, which indicates the breakdown of the plastic phase.…”

Section: Chemistryselectmentioning

confidence: 99%

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Non‐Isothermal Kinetics of Phoenix Dactylifera L. Date Palm Seeds Pyrolysis Using Model Fitting and Iso‐Conversional Model Free Methods

et al. 2023

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In this paper, Phoenix dactylifera L. date palm seeds (RDS) were first characterized from a physicochemical point of view, in particular the proximate and ultimate composition, XRD, and SEM-EDX analyses. Based on findings RDS contains 77.4 % of total carbohydrates, 12.8 % of lignin, and a higher heating value (HHV) of 15.88 MJ kg À 1 . Immuno-labeling intensity (OD) of noncellulosic RDS fraction was also determined thanks to the ELISA technique after the dissolution of polysaccharides in ionic liquid showing the presence of mannans and xyloglucans and the absence of arabinans in date seeds, a significant amount of homogalacturonans were also detected. The thermal decomposition and kinetic of date palm seeds (RDS) using TGA-DTG, and DSC measurements were then investigated. The RDS samples were heated in the temperature ranges 25-600 °C at 5, 10, 15, and 20 °C/min. The decomposition of hemicelluloses, cellulose, and lignin, active pyrolysis of RDS, was held in a range of temperature 160-450 °C. The kinetic parameters such as activation energy (E a ) and pre-exponential factor (A) were determined for two degradation steps by using iso-conversional model-free methods. The E a and pre-exponential factor obtained by the Kissinger method are 212 kJ mol À 1 and 7.8 × 10 19 min À 1 for the first decomposition interval (I1) and 172 kJ mol À 1 and 5.96 × 10 13 min À 1 for the second decomposition interval I2. The same average parameters calculated by model-free methods are 126-156 kJ mol À 1 and 180-213 kJ mol À 1 and 3.36 × 10 14 and 7.07 × 10 17 min À 1 respectively for the first and second intervals of thermal decomposition. Indicating that activation energy decreases in the final stages of the process and that the energy required for hemicelluloses degradation is lower than that of cellulose. The most probable reaction functions have been determined for these two stages, by Coats-Redfern (CR) and Criado methods, leading to considerably improved calculation performance over the entire conversion range. The pyrolysis reaction models of RDS are described by reaction, second order F2 for cellulose and hemicelluloses. With the Arrhenius parameters obtained from the fitting model of CR, we attempt to reconstruct the temperature-dependent mass conversion curves and have resulted in generally acceptable results. Based on the Arrhenius parameter values, obtained by the Kissinger equation, the changes in entropy, enthalpy, Gibbs free energy, and lifetime predictions have been estimated for the thermal degradation processes of RDS.

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Section: Resultsmentioning

confidence: 99%

Section: Chemistryselectmentioning

confidence: 99%

Non‐Isothermal Kinetics of Phoenix Dactylifera L. Date Palm Seeds Pyrolysis Using Model Fitting and Iso‐Conversional Model Free Methods

et al. 2023

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“…The evaporation of water traces and volatile compounds was responsible for the mass loss observed from room temperature to 150 • C. The most significant mass loss occurred within the temperature range of 200-450 • C (Figure 1a,b). The degradation pattern of the lignocellulosic biomass was largely discussed in the literature [19,46,47,68,69]. Previous reports have accounted for the complex degradation process that involved mainly three overlapping degradation steps: hemicellulose started first (200-250 • C), but its degradation ended after the pyrolysis onset of cellulose (around 350 • C).…”

Section: Thermogravimetric Analysismentioning

confidence: 99%

Thermal and Viscoelastic Responses of Selected Lignocellulosic Wastes: Similarities and Differences

Ionita¹,

Cristea²,

Cosmulescu³

et al. 2023

Polymers

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Woody lignocellulosic biomasses comprise the non-edible parts of fruit trees. In recent years, the exploitation of this biomass has been widening in order to mitigate environmental issues. At the same time, this waste could be transformed into a value-added product (active carbon by pyrolysis, isolation of nanocellulose, oils or proteins). For either valorization path, a complete thermo-mechanical characterization is required. A detailed thermo-mechanical study (TGA, DSC, DMA) was performed on two types of lignocellulosic wastes, with and without kernels: on one side, the walnut shells (WS) and the pistachio shells (PsS) and, in the second category, the apricot seeds (AS), the date seeds (DS), and the plum seeds (PS). The results of the sample-controlled thermal analyses (HiRes TGA) evidenced a better resolution of the degradation steps of WS. Kinetic studies conducted also by conventional TGA (Flynn–Wall–Ozawa) and modulated TGA (MTGA) allowed us to make comparative reasonings concerning the degradation of the investigated biomasses. The DMA results revealed the effect of water traces and oil kernels on relaxation and supported the atypical DSC endotherm emphasized in the freezing temperature domain.

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Activated carbon derived from palm date seeds as an adsorbent for methylene blue: kinetic and thermodynamic studies

Fath Allah,

Ouaddari,

Hernández-Saz

et al. 2024

Reac Kinet Mech Cat

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Thermal and thermomechanical behavior of Moroccan Boufeggous variety date seeds

Cited by 6 publications

References 13 publications

Non‐Isothermal Kinetics of Phoenix Dactylifera L. Date Palm Seeds Pyrolysis Using Model Fitting and Iso‐Conversional Model Free Methods

Non‐Isothermal Kinetics of Phoenix Dactylifera L. Date Palm Seeds Pyrolysis Using Model Fitting and Iso‐Conversional Model Free Methods

Thermal and Viscoelastic Responses of Selected Lignocellulosic Wastes: Similarities and Differences

Activated carbon derived from palm date seeds as an adsorbent for methylene blue: kinetic and thermodynamic studies

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