Pyrolysis of high ash sewage sludge: Kinetics and thermodynamic analysis using Coats-Redfern method

Naqvi, Salman Raza; Tariq, Rumaisa; Hameed, Zeeshan; Ali, Imtiaz; Naqvi, Muhammad; Chen, Wei‐Hsin; Ceylan, Selim; Rashid, Harith; Ahmad, Jamal; Taqvi, Syed Ali Ammar; Shahbaz, Muhammad

doi:10.1016/j.renene.2018.07.094

Cited by 273 publications

(63 citation statements)

References 48 publications

(43 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The expressions of f(α), g(α) based on five major types of reaction models (power law models, nucleation models, reaction-order models, diffusion models and geometrical contraction models) are shown in Table 1 [29][30][31].…”

Section: Kinetic Theorymentioning

confidence: 99%

Thermal Decomposition Mechanism and Kinetics Study of Plastic Waste Chlorinated Polyvinyl Chloride

et al. 2019

View full text Add to dashboard Cite

Chlorinated polyvinyl chloride (CPVC), as a new type of engineering plastic waste, has been used widely due to its good heat resistance, mechanical properties and corrosion resistance, while it has become an important part of solid waste. The pyrolysis behaviors of CPVC waste were analyzed based on thermogravimetric experiments to explore its reaction mechanism. Compared with polyvinyl chloride (PVC) pyrolysis, CPVC pyrolysis mechanism was divided into two stages and speculated to be dominated by the dehydrochlorination and cyclization/aromatization processes. A common model-free method, Flynn-Wall-Ozawa method, was applied to estimate the activation energy values at different conversion rates. Meanwhile, a typical model-fitting method, Coats-Redfern method, was used to predict the possible reaction model by the comparison of activation energy obtained from model-free method, thereby the first order reaction-order model and fourth order reaction-order model were established corresponding to these two stages. Eventually, based on the initial kinetic parameter values computed by model-free method and reaction model established by model-fitting method, kinetic parameters were optimized by Shuffled Complex Evolution algorithm and further applied to predict the CPVC pyrolysis behaviors during the whole temperature range.

show abstract

Section: Kinetic Theorymentioning

confidence: 99%

Thermal Decomposition Mechanism and Kinetics Study of Plastic Waste Chlorinated Polyvinyl Chloride

et al. 2019

View full text Add to dashboard Cite

show abstract

“…The CR employed an asymptotic series expansion for the approximation of the exponential integration which enabled the improved accuracy compared with other methods. Previous studies utilized the CR method for the determination of the kinetic parameters of oil shale, date palm residues, olive mill waste, and pyrolyzed sewage sludge using TG data. To date, CR had not been used in determining the kinetic parameters of iron oxide reduction.…”

Section: Materials and Methodologymentioning

confidence: 99%

Kinetic and thermodynamic analysis of iron oxide reduction by graphite for CO₂mitigation in chemical‐looping combustion

et al. 2020

Self Cite

View full text Add to dashboard Cite

Summary Chemical‐looping combustion (CLC) provides a platform to generate energy streams while mitigating CO2 using iron oxide as a carrier of oxygen. Through the reduction process, iron oxide experiences phase transformation to ultimately produce metallic iron. To understand iron oxide reduction characteristics and optimally design the fuel reactor, kinetic and thermodynamic analyses were proposed, utilizing graphite. This study aims to evaluate the reduction behavior under the non‐isothermal process of various mixture ratios of hematite and graphite via thermogravimetric analysis with simultaneously evaluating evolved gases using a Fourier transform infrared spectrometer. The Coats‐Redfern model was employed to approximate the kinetic and thermodynamic parameters which assessed the different reaction mechanisms together with the distributed activation energy model (DAEM). The results revealed that the hematite‐to‐graphite ratio of 4:1 had the highest reduction degree and had three distinct peaks representing three iron oxide reduction phases. The zero‐order reaction mechanism agreed with the experimental results compared with other reaction models. The thermodynamic analysis showed an overall endothermic spontaneous reaction for the three phases which signified the direct reduction of the iron oxides. The DAEM result validated a stepwise reduction of iron oxides to metallic iron. The study aids the optimal design of the CLC fuel reactor for enhanced system performance.

show abstract

“…In general, kinetic analysis is commonly performed by the basic equation below:

\frac{dα}{dt} = k ((), T) f ((), α),

where α means the conversion rate of reactant, t represents the time, and f ( α ) gives the reaction model which depends on the reaction mechanism. α is expressed by:

α = \frac{m_{0} - m_{t}}{m_{0} - m_{\infty}},

where m 0 , m t , and m ∞ represent primary sample mass, sample mass at given time t, and final sample mass, respectively.…”

Section: Methodsmentioning

confidence: 99%

Co‐pyrolysis characteristics of polysaccharides‐cellulose and the co‐pyrolyzed compound distributions over two kinds of zeolite catalysts

et al. 2020

View full text Add to dashboard Cite

Summary Co‐pyrolysis characteristics of soluble polysaccharides‐cellulose were investigated through thermogravimetric analysis (TGA), kinetic analysis, analytical pyrolyser coupled with gas chromatograph‐mass spectrometer (Py‐GC/MS) and subsequent density functional theory (DFT). Results from TGA and differential thermogravimetric analysis (DTG) analyses indicated that there were synergistic effects in the polysaccharides‐cellulose (PS‐CE) blends pyrolysis process. Surprisingly in co‐pyrolysis process from Py‐GC/MS analysis, the furans were suppressed, while the anhydrosugars were increased. The DFT calculation showed that free radicals pyrolyzed from soluble polysaccharides could suppress the ring‐opening reaction of D‐glucopyranose. The co‐pyrolyzed chemical compound distribution over the catalysts (MCM‐41, ZSM‐5 and their mixtures) was also detected through Py‐GC/MS analysis. Both the zeolites showed high selectivity for 5‐methyl‐2‐furaldehyde and 2‐furaldehyde. The two kinds of zeolites could induce the generation of furans but suppress the production of anhydrosugars, which was the opposite effect of the co‐pyrolysis of PS‐CE.

show abstract

Pyrolysis of high ash sewage sludge: Kinetics and thermodynamic analysis using Coats-Redfern method

Cited by 273 publications

References 48 publications

Thermal Decomposition Mechanism and Kinetics Study of Plastic Waste Chlorinated Polyvinyl Chloride

Thermal Decomposition Mechanism and Kinetics Study of Plastic Waste Chlorinated Polyvinyl Chloride

Kinetic and thermodynamic analysis of iron oxide reduction by graphite for CO₂mitigation in chemical‐looping combustion

Co‐pyrolysis characteristics of polysaccharides‐cellulose and the co‐pyrolyzed compound distributions over two kinds of zeolite catalysts

Contact Info

Product

Resources

About

Pyrolysis of high ash sewage sludge: Kinetics and thermodynamic analysis using Coats-Redfern method

Cited by 273 publications

References 48 publications

Thermal Decomposition Mechanism and Kinetics Study of Plastic Waste Chlorinated Polyvinyl Chloride

Thermal Decomposition Mechanism and Kinetics Study of Plastic Waste Chlorinated Polyvinyl Chloride

Kinetic and thermodynamic analysis of iron oxide reduction by graphite for CO2mitigation in chemical‐looping combustion

Co‐pyrolysis characteristics of polysaccharides‐cellulose and the co‐pyrolyzed compound distributions over two kinds of zeolite catalysts

Contact Info

Product

Resources

About

Kinetic and thermodynamic analysis of iron oxide reduction by graphite for CO₂mitigation in chemical‐looping combustion