Thermodynamics and kinetics of Doum (Hyphaene thebaica) shell using thermogravimetric analysis: A study on pyrolysis pathway to produce bioenergy

Mohammed, Habu Iyodo; Kabir, G.; Ahmed, Saeed Isa; Abubakar, Lawan Garba

doi:10.1016/j.renene.2022.10.042

Cited by 21 publications

(2 citation statements)

References 57 publications

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Section: Kinetic Calculation Analysismentioning

confidence: 99%

“…(1) equations generated from mobility modeling procedures where gas diffusion through the Li 2 CO 3 and Ti 2 O 3 layer is the rate-limiting phase, especially, the Yander formula [36], Y 1 = (1 − (1 − R) 1/3 ) 2 = kt; and Gistling model [37], Y 2 = 1 − 2α/3 − (1 − α) 2/3 = kt; centration; α means the stoichiometric ratio; ρ indicates the reactant density; r0 is the reactant's initial particle diameter, (cm); t is the reaction time, (s); and k' is the rate parameter. Accorded to Equation ( 4), the values of rate constant k' are calculated.…”

Section: Kinetic Calculation Analysismentioning

confidence: 99%

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Sol–Gel Synthesis of LiTiO2 and LiBO2 and Their CO2 Capture Properties

Chen

2022

Atmosphere

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LiTiO2 was prepared from tetraethoxy titanium and lithium ethoxide by a sol–gel process and then treated at 773 K and 973 K under oxygen atmosphere, respectively. Compared with LiTiO2 prepared at 973 K, LiTiO2 prepared at 773 K has better CO2 capture properties. XRD patterns of synthetic LiTiO2 before and after CO2 capture confirm that the intermediate product, LixTizO2, is produced during CO2 capture. CO2 absorption degree of LiTiO2 was determined to be 37% (293 K), 40.8% (333 K), 45.5% (373 K), and 50.1% (393 K) for 11.75 h, respectively. Repetitive CO2 capture experiment indicates that LiTiO2 has excellent cyclic regeneration behavior. The CO2 absorption degree of LiTiO2 increased with increasing CO2 concentration. At a concentration of 0.05%, the absorption degree of LiTiO2 had a stable value of 1% even after an absorption time of 1.4 h. LiBO2 was fabricated by the similar sol–gel method and treated at 713 K. Mass percentage and specific surface area of synthesized LiBO2 increased with the increasing absorption temperature. Evidently, the diffusion of the CO2 molecule through the reaction product, which had a low activation energy of 15 kJ·mol−1 and apparent specific surface value of 55.63 m2/g, determined the efficiency of the absorption reaction. Compared with the other sol–gel synthesized lithium-based oxides, LiTiO2 possessed higher absorption capabilities and lower desorption temperature.

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Section: Kinetic Calculation Analysismentioning

confidence: 99%

Section: Kinetic Calculation Analysismentioning

confidence: 99%

Sol–Gel Synthesis of LiTiO2 and LiBO2 and Their CO2 Capture Properties

Chen

2022

Atmosphere

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Exploring the link between inflation, tourism, trade, foreign direct investment, and renewable energy consumption: evidence from novel wavelet quantile correlation approach

Durani,

Anwar,

Sharif

et al. 2024

Clean Techn Environ Policy

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Thermal decomposition characteristics and study of the reaction kinetics of tea-waste

Alashmawy

Hassan

Elwardany

2023

Biomass Conv. Bioref.

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This study aimed to investigate waste-tea’s pyrolysis kinetics and thermodynamics to assess its potential for thermochemical processes. In this study, three primary samples of tea-waste are prepared for investigation: raw, torrefied at 200 °C, and torrefied at 600 °C. Under a nitrogen environment, thermogravimetric analyses (TGA) were conducted at seven heating rates (10, 15, 20, 25, 30, 35, and 40 °C/min) to investigate the effect of heating rates on the kinetic parameters at temperatures ranging from 27 to 1000 °C. Using seven heating rates was beneficial to take advantage of multiple heating rates techniques alongside single heating rate techniques. These heating rates were combined, forming four heating rate groups (HRG). The pyrolysis kinetic parameters are determined using two model-fit-methods, direct Arrhenius and Coats-Redfern methods, and two model-free methods, Flynn-Wall-Ozawa (FWO) and Kissinger-Akahira-Sunose (KAS) methods. Thermodynamic data comprising ΔH, ΔG, and ΔS are addressed. The X-ray fluorescence (XRF) and Fourier transform infrared (FTIR) spectrum are used to assess the presence of natural minerals in tea-waste. The results indicated that the tea-waste material has the potential to produce syngas. The torrefaction process at 600 °C shows a 53% increase in the energy content compared to the raw biomass. The Coats-Redfern is shown to be more reliable than the direct Arrhenius method. The activation energy (Ea) witnesses rising with the heating rate (β) from Ea = 55.27 kJ mol−1 at β = 10 °C min−1 to 60.04 kJ mol−1 at β = 40 °C min−1 for raw tea-waste using Coats-Redfern method. For model-free approaches, the minimum activation energy values of the raw tea-waste samples are 82 kJ/mol for FWO and 78 kJ/mol for KAS, whereas the peak values are 420 kJ/mol for KAS and 411 kJ/mol for FWO. A comparison of the effect of heating rate groups for FWO method in raw material case indicated that HRG1 has the maximum activation energy average value. The resulting values of HRG1, HRG2, HRG3, and HRG4 were 269 kJ/mol, 145 kJ/mol, 174 kJ/mol, and 202 kJ/mol, respectively.

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Thermodynamics and kinetics of Doum (Hyphaene thebaica) shell using thermogravimetric analysis: A study on pyrolysis pathway to produce bioenergy

Cited by 21 publications

References 57 publications

Sol–Gel Synthesis of LiTiO2 and LiBO2 and Their CO2 Capture Properties

Sol–Gel Synthesis of LiTiO2 and LiBO2 and Their CO2 Capture Properties

Exploring the link between inflation, tourism, trade, foreign direct investment, and renewable energy consumption: evidence from novel wavelet quantile correlation approach

Thermal decomposition characteristics and study of the reaction kinetics of tea-waste

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