Kinetic and thermodynamics study of the pyrolytic process of the freshwater macroalga, Chara vulgaris

Badshah, Syed Lal; Shah, Zahir; Alves, José Luiz Francisco; Silva, Jean Constantino Gomes da; Noreen, Noreen; Iqbal, Arshad

doi:10.1007/s10811-021-02459-3

Cited by 24 publications

(4 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…apparatus to analyze decomposition profiles and perform thermo-kinetic studies. Each experiment involved an initial known sample amount placed on a platinum pan at room temperature, ensuring that sample quantity and arrangement minimized diffusional effects, as established in previous studies [29,30]. The samples were subjected to a controlled temperature increase from room temperature to maximum temperature under an inert atmosphere, providing a comprehensive range of thermal decomposition.…”

Section: Pyrolysis Experimentsmentioning

confidence: 99%

See 1 more Smart Citation

Exploring the pyrolysis of agave species as a novel bioenergy source: thermo-kinetics, modeling, and product composition insights

Gomes da Silva,

Arias,

Pacheco

et al. 2024

Preprint

View full text Add to dashboard Cite

The agave plant’s economic chain generates a significant waste, which has potential for sustainable bioenergy through pyrolysis. However, the diversity and heterogeneity of chemical composition of agave species may pose challenges. This study investigates the impact of species heterogeneity on the pyrolysis of three different agave species (Agave sisalana, Agave tequilana, and Agave wercklei), aiming to correlate pyrolysis and biomass properties. Solid characterization and Py-GC/MS were used to understand agave physicochemical characteristics and organic group distribution in volatiles, respectively.A multi-step model and advanced numerical methods were employed for the kinetic study. The physicochemical characteristics showed similar values but a distinct distribution of inorganic compounds, predominantly composed of alkaline metals (6-11%w.b.), potentially influencing the organic groups’ distribution in the volatiles. High relative areas of aliphatic components (13-28% at 773K and 16-36% at 873K) and low quantity of acidic groups (<2%) could be attributed to the catalytic deoxygenation promoted by alkaline metals. These findings are significant for future application of agave in bio-oil production by pyrolysis, as commercial biomasses often yield a high content of oxygenated and acid groups. For the kinetic study, six decomposition profiles were identified in the pyrolysis, encompassing the decomposition of extractives, saponins, lignocellulose, and oxalate salts. The similarity in profiles resulted in approximately equivalent kinetic parameter values and mechanisms among the species. The average values of Ea ranged from 71-324 kJ mol-1, k0 values varied between 107-1022, and the reaction mechanisms included n-order and Avrami-Erofeyev types. The validity of the parameters was verified through curve reconstruction. The inorganic composition was chosen as the parameter related to pyrolysis characteristics, as it was the only parameter that differed significantly among the species. Based on the data, normalization and the proposed model demonstrated satisfactory values of R² (>0.9251), QOF (>94%), and MSE (<2.73×10-3). This underscores the model's potential to describe decomposition profiles solely based on knowledge of inorganic composition, regardless of agave species.

show abstract

Section: Pyrolysis Experimentsmentioning

confidence: 99%

“…The samples were subjected to a controlled temperature increase from room temperature to maximum temperature under an inert atmosphere, providing a comprehensive range of thermal decomposition. The experimental conditions included: (1) initial sample amount of 10 mg, (2) four different heating rates (10,20,30, and 40 K min -1 ),…”

Section: Pyrolysis Experimentsmentioning

confidence: 99%

Exploring the pyrolysis of agave species as a novel bioenergy source: thermo-kinetics, modeling, and product composition insights

Gomes da Silva,

Arias,

Pacheco

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

“…The species was identi ed by professor Arshad Iqbal in Department of Botany, Islamia College Peshawar. The collected algae was washed with tap water followed by distilled water to remove mud or sand particles as performed previously for various algae [17]. The biomass material was dried and powdered with a grinder and stored in airtight jars.…”

Section: Collection and Pretreatmentmentioning

confidence: 99%

Adsorption of Brilliant Blue Dye on Biochar from the Macroalgae Cladophora glomerata

Areej

Mumtaz

Aman

et al. 2023

Preprint

View full text Add to dashboard Cite

Here we describe the utilization of freshwater macroalgae Cladophora glomerata (C. glomerata) biochar at comparatively low cost for the removal of brilliant blue dye (BBD) from aqueous solutions. The macroalgae was successfully converted into biochar through thermal pyrolysis. The chemical and morphological nature of the biosorbent was analyzed through Fourier Transform Infrared (FTIR) spectroscopy, scanning electron microscopy and thermogravimetric analysis. The effect of pH, initial concentration and adsorbent dosage were investigated. The removal of brilliant blue increased linearly with increasing adsorbent dose, concentration, and contact duration. Optimized conditions for adsorption were pH 4, contact time of 150 minutes, and adsorbent dosage of 3.0 g. Langmuir isotherm best explained the adsorption data and required parameters and appropriate constants were calculated. These results suggest that C. glomerata may remove dye from aqueous solutions.

show abstract

“…The model was used for the computation of the pre-exponential frequency factor (A), which gives insight into the frequency of collisions between reactants [60]. It has been shown that for pre-exponential factor values with orders of magnitude ≤ 10 9 min −1 , the surface reaction pathway is predominantly manifested [61]-this pathway was clearly noticeable for θ = 0.6 − 0.7, in the air atmosphere. The ∆H was negatively correlated with the conversion for air (r = −0.27; p < 0.05), while it was positively correlated for N 2 (r = 0.84; p < 0.05).…”

Section: Thermodynamics Analysismentioning

confidence: 99%

Study on Combustion Characteristics and Thermodynamic Parameters of Thermal Degradation of Guinea Grass (Megathyrsus maximus) in N2-Pyrolytic and Oxidative Atmospheres

et al. 2021

View full text Add to dashboard Cite

This study provides an extensive investigation on the kinetics, combustion characteristics, and thermodynamic parameters of the thermal degradation of guinea grass (Megathyrsus maximus) in N2-pyrolytic and oxidative atmospheres. A model-fitting technique and three different iso-conversional techniques were used to investigate the kinetics of the thermal process, after which an analysis of the combustion characteristics and thermodynamic parameters was undertaken. Prior to this, experiments on the physico-chemical characterization, thermogravimetric, and spectroscopic analyses were carried out to provide insight into the compositional structure of the guinea grass. The volatile matter, fixed carbon, and total lignin contents by mass were 73.0%, 16.1%, and 21.5%, respectively, while the higher heating value was 15.46 MJ/kg. The cellulose crystallinity index, determined by XRD, was 0.43. The conversion of the GG in air proceeded at a relatively much higher rate as the maximum mass-loss rate peak in a 20 K/min read was −23.1 and −12.3%/min for the oxidative and the pyrolytic, respectively. The kinetics investigation revealed three distinctive stages of decomposition with their corresponding values of activation energy. The average values of activation energy (FWO) at the latter stages of decomposition in the pyrolytic processes (165 kJ/mol) were higher than those in the oxidative processes (125 kJ/mol)—an indication of the distinctive phenomenon at this stage of the reaction. The Coats–Redfern kinetic model revealed that chemical reactions and diffusional models played a predominant role in the thermal decomposition process of the GG. This study showed that the thermodynamic parameters varied with the conversion ratio, and the combustion performance increased with the heating rates. The use of GG as an energy feedstock is recommended based on the findings from this work.

show abstract

Kinetic and thermodynamics study of the pyrolytic process of the freshwater macroalga, Chara vulgaris

Cited by 24 publications

References 47 publications

Exploring the pyrolysis of agave species as a novel bioenergy source: thermo-kinetics, modeling, and product composition insights

Exploring the pyrolysis of agave species as a novel bioenergy source: thermo-kinetics, modeling, and product composition insights

Adsorption of Brilliant Blue Dye on Biochar from the Macroalgae Cladophora glomerata

Study on Combustion Characteristics and Thermodynamic Parameters of Thermal Degradation of Guinea Grass (Megathyrsus maximus) in N2-Pyrolytic and Oxidative Atmospheres

Contact Info

Product

Resources

About