Pyrolysis of pigeon pea (Cajanus cajan) stalk: Kinetics and thermodynamic analysis of degradation stages via isoconversional and master plot methods

Kirti, Nikhil; Tekade, Shyam P.; Tagade, Ankita; Sawarkar, Ashish N.

doi:10.1016/j.biortech.2021.126440

Cited by 53 publications

(10 citation statements)

References 46 publications

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“…Change in enthalpy (∆ H ) is a measure of the energy difference between biomass and activated complex. Enthalpy is a crucial thermodynamic property in determining whether the processes that eventuate through the pyrolysis method are exothermic or endothermic 53 . The change in enthalpy in relation to conversion for OFW method at all four heating rates is represented in Figure 4A.…”

Section: Resultsmentioning

confidence: 99%

“…Enthalpy is a crucial thermodynamic property in determining whether the processes that eventuate through the pyrolysis method are exothermic or endothermic. 53 The change in enthalpy in relation to conversion for OFW method at all four heating rates is represented in Figure 4A. From the results, the average value of enthalpy change, ∆H (kJ mol −1 ) computed using OFW method were reported as 220.355 at 10 • C min −1 , 220.239 at 20 • C min −1 , 220.189 at 35 • C min −1 , and 220.122 at 55 • C min −1 .…”

Section: Thermodynamic Analysismentioning

confidence: 99%

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Kinetics and thermodynamics of non‐isothermal pyrolysis of Terminalia chebula branches at different heating rates

Thejaswini,

Annapureddy,

Rammohan

et al. 2023

Int J of Chemical Kinetics

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Non‐isothermal thermogravimetric tests of Terminalia chebula (Helikha) were conducted under inert N2 gas environment for temperatures (25–900°C) at heating rates of 10, 20, 35, and 55°C min−1. Kinetic triplet approximated employing five iso‐conversional methods namely, differential Friedman method (DFM), distributed activation method (DAEM), Ozawa–Flynn–Wall (OFW), Kissinger–Akahira–Sunose (KAS), and Starink (STK). Average values of activation energy (kJ mol−1) and frequency factor (min−1) calculated by the five models were 227.11, 2.98 × 1021 for DFM; 229.21, 4.63 × 1021 for KAS; 227.11, 3.81 × 1020 for OFW; 225.54, 1.15 × 1018 for STK; and 227.33, 3.02 × 1020 for DAEM respectively over the conversion range up to 0.8. In the kinetics study, correlation coefficient (R2) of greater than 0.97 is noticed in the conversion range of α = 0.1–0.8 for all models. From thermodynamic analysis, average values of ΔH (kJ mol−1), ΔG (kJ mol−1), and ΔS (kJ mol−1 K−1) for DAEM: 221.8, 179.69, and 0.065; for DFM: 236.40, 179.37, and 0.089; for KAS: 221.8, 179.69, and 0.065; for OFW: 220.22, 179.72, and 0.063; and for STK: 222.02, 179.68, and 0.066 were estimated to assess viability and reactivity of the process. Criado's master plots revealed that the data obtained from pyrolysis of selected biomass was followed a multistep reaction pathway.

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Section: Resultsmentioning

confidence: 99%

Section: Thermodynamic Analysismentioning

confidence: 99%

Kinetics and thermodynamics of non‐isothermal pyrolysis of Terminalia chebula branches at different heating rates

Thejaswini,

Annapureddy,

Rammohan

et al. 2023

Int J of Chemical Kinetics

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“…). For estimation of ΔH, ΔS, and ΔG at different conversion(a) for 15 °C min −1 heating rate was calculated [30]. Pre-exponential factor (A) used in equation ( 14) is calculated using the following equation (16) ( )…”

Section: Thermodynamics Analysismentioning

confidence: 99%

“…Table 3 shows that the correlation coefficient (R 2 ) values for the used models to calculate activation energy are typically near to 1, indicating the reliability of these models in determining the activation energy of the sesame agro residue. The rise and decrease in activation energy with conversion reveal the intricate nature, heterogeneity, and multi-step reaction mechanism of pyrolysis of Sesame agro residue [75]. As cellulose has become the most predominant element of the pyrolysis reduction of the samples, the activation energy increased between 0.3 and 0.6.…”

Section: Kinetic Analysismentioning

confidence: 99%

“…Several studies were conducted to estimate the pyrolysis kinetics of agricultural wastes such as Palm oil waste [22], bagasse [23] rice straw [24], pecan shell [25], rice husk [26], pearl millet [27], aloe vera [28], Bengalese [29], pigeon pea [30], hazelnut husk [31], coconut shell [32], and garlic stalks [33]. Li et al (2021) studied pyrolysis of sesame residue at different temperatures (350 °C-650 °C) [34].…”

Section: Introductionmentioning

confidence: 99%

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Understanding the pyrolysis kinetics, thermodynamic, and environmental sustainability parameters of Sesamum indicum crop residue

Sivaraman,

Shanmugam,

Veerapandian

et al. 2023

Environ. Res. Commun.

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In this work, the physiochemical characteristics, thermodynamics, and sustainability of the pyrolysis of Sesamum indicum biomass were assessed. The pyrolysis kinetics of sesame agro-residues performed using isoconversional techniques such as Kissinger, KAS, and OFW methods showed activation energies of 192, 120, and 123 kJ mol−1, respectively. The impact of the pyrolysis temperature (550, 650, 750 °C) on the generation of biochar, bio-oil, and gas is also studied; the exergy efficiency increased from 82.7 at 550 °C to 87.3% at 750 °C with an increase in the temperature. Sesame biochar’s Van Krevalan diagram showed how its fuel-like characteristics also grew with rising temperatures. The input and output parameters showed a high agreement in the mass, energy, and exergy balance closures. However, it was shown that the overall energy efficiency was greater at 750 °C (71.2%) compared to 55.5% and 69.8% at 550 °C and 650 °C, respectively. Sustainability analysis showed that lower temperatures had a smaller impact on the environment.

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Non‐isothermal Thermogravimetric Analysis of Peltophorum pterocarpum and Evaluation of Kinetic Triplet

Thejaswini,

Annapureddy,

Kishore

2024

Chem Eng & Technol

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The primary focus of the twenty‐first century has been on developing new and cleaner fuels from renewable sources. The increasing availability of renewable energy sources in environment, such as lignocellulosic biomass derived from agricultural and forest residues, has created a plethora of opportunities for biofuel production. For this purpose, the search for appropriate waste biomass source and the design of suitable reactors are very essential, where the latter requires the knowledge of kinetic triplets. These requirements paved the way to the novelty of the present work as a selection of a rarely used biomass source, that is, Peltophorum pterocarpum, and its non‐isothermal thermogravimetric analysis for the evaluation of kinetic triplet of the process. The range of temperature is 298–1173 K attained at heating rates of 10–55 K min−1. Kinetics were estimated using differential Friedman method (DFM), distributed activation energy method (DAEM), Ozawa–Flynn–Wall (OFW), Kissinger–Akahira–Sunose (KAS), and Starink (STK) models. Mean activation energy (kJ mol−1) and pre‐exponential factor (min−1) of pyrolysis process by five models were 183.68 and 1.24 × 1017 for DAEM, 194.28 and 3.08 × 1021 for DFM, 183.68 and 4.40 × 1016 for KAS, 184.12 and 2.12 × 1014 for OFW, and 183.93 and 3.56 × 1016 for STK. Average values of changes in Gibbs free energy, enthalpy, and entropy by five models are 174 kJ mol−1, 178 kJ mol−1, and 0.007 kJ mol−1 K−1, respectively. Criado's master plots revealed distinct reaction pathways during the process for different conversion levels.

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Pyrolysis of pigeon pea (Cajanus cajan) stalk: Kinetics and thermodynamic analysis of degradation stages via isoconversional and master plot methods

Cited by 53 publications

References 46 publications

Kinetics and thermodynamics of non‐isothermal pyrolysis of Terminalia chebula branches at different heating rates

Kinetics and thermodynamics of non‐isothermal pyrolysis of Terminalia chebula branches at different heating rates

Understanding the pyrolysis kinetics, thermodynamic, and environmental sustainability parameters of Sesamum indicum crop residue

Non‐isothermal Thermogravimetric Analysis of Peltophorum pterocarpum and Evaluation of Kinetic Triplet

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