Intrinsic char reactivity of plastic waste (PET) during CO2 gasification

Gil, M.V.; Fermoso, Javier; Pevida, C.; Pís, J.J.; Rubiera, F.

doi:10.1016/j.fuproc.2010.07.019

Cited by 32 publications

(10 citation statements)

References 34 publications

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“…The plots of the non-dimensional rates were more convex than those of the volume reaction model (dotted line). In this case, the random pore model (RPM) was applied to estimate the CO 2 gasification rates of the chars (Bhatia and Perlmetter, 1980, Gil, et al, 2010, Yuan, et al, 2011. In cases where a drastic increase in the non-dimensional rate is observed at high carbon conversion (X > 0.6) during the CO 2 gasification of metal-loaded chars, the extended random pore model (eRPM) is usually applied to estimate the gasification rates (Tancredi, et al, 1996, Marques, et al, 2002, Zhang, et al, 2008, Kopyscinski, et al, 2013.…”

Section: Measurement Of the Co 2 Gasification Reactivity Of The Charsmentioning

confidence: 99%

Effect of metal content on CO<sub>2</sub> gasification behavior of K- and Fe-loaded bio-chars

Hanaoka

Okumura

2014

JTST

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The effects of Fe and K contents of Fe-and K-loaded chars containing 0 23% Fe and 0-20% K, respectively, with negligible amounts of poisoning elements, on the CO 2 gasification behavior (C + CO 2 → 2CO) were investigated in the temperature range of 750-1050°C. For 23% Fe-loaded char at gasification temperatures of 900 and 1000 °C, the CO 2 gasification rate constants (K p ) were respectively 3.3 times and ~ 8 times higher than those of the char without Fe. At 900 °C, the K p value increased with an increase in the Fe content up to 10% and remained almost constant above 10% Fe. For K-loaded chars, the K p value of the char loaded with 10% K had a maximum value of 5.4 min −1 at 900 °C; this value was ~ 300 times that of the char without K loading and ~ 90 times higher than the corresponding K p values of Fe-loaded chars at 900 °C. The addition of excess K (upon loading greater than 10%) to bio-char decreased the K p because of the decrease in the number of active sites on the char surface.

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Section: Measurement Of the Co 2 Gasification Reactivity Of The Charsmentioning

confidence: 99%

Effect of metal content on CO<sub>2</sub> gasification behavior of K- and Fe-loaded bio-chars

Hanaoka

Okumura

2014

JTST

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“…One of the most important varying intrinsic properties of the char that influence its gasification rate is char physical structure. Many studies intended to correlate char physical structure properties and their changes with the char conversion rate . Char reactivity has been correlated to such structural properties as the specific surface area, mesopore volume, and carbon crystalline structure.…”

Section: Introductionmentioning

confidence: 99%

“…Some researchers aimed to correlate the reaction rate with the specific surface areas derived from the conventional physical adsorption techniques. Several studies have not revealed a direct linear correlation between the gasification rate and char specific surface area determined by the Brunauer‐Emmett‐Teller (BET) method . There was also no obvious correlation observed between char reactivities and the carbon crystalline structure …”

Section: Introductionmentioning

confidence: 99%

“…Many studies intended to correlate char physical structure properties and their changes with the char conversion rate. [6,[22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38] Char reactivity has been correlated to such structural properties as the specific surface area, mesopore volume, and carbon crystalline structure. In most cases, the correlation was restricted to the linear relation expected between the changes of the gasification/ combustion reaction rates (char reactivity) and the changes of the structural properties during the reaction.…”

Section: Introductionmentioning

confidence: 99%

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Brown coal char CO₂‐gasification kinetics with respect to the char structure part II: Kinetics and correlations

et al. 2018

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Coal's physical structure is known to affect high‐temperature coal conversion processes such as gasification or combustion. This paper is Part II of the study of brown coal char structural changes during gasification. Firstly, German Lusatian brown coal was gasified in a laboratory‐scale fluidized bed reactor in CO2 within a temperature range of 800–950 °C at atmospheric pressure. Then, physical structure properties were extensively evaluated by means of various techniques. Char specific surface area and its changes during gasification reaction were evaluated using N2 and CO2 physical adsorption techniques. Adsorption isotherms were also interpreted employing unconventional methods in order to obtain the specific surface areas of pores of different sizes. Gasification kinetics were evaluated employing three widely applied kinetic models: the random pore model (RPM), the volume reaction model (VM), and the shrinking core model (SCM). Finally, the instantaneous gasification reaction rate was correlated with the char structural properties at the corresponding conversion degrees. The closest linear correlation appeared between the gasification reaction rate and the specific surface area of mesopores (as determined by N2 adsorption). Furthermore, correlations of the other structural properties with char conversion are provided. Observed structural changes were compared with the assumptions of the kinetic models.

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“…Consequently, for different biomass and coals char containing various amount of alkali and alkaline metal contents, their gasification performance are totally different. However, there are few alkali and alkaline metals exist in the WEEE plastic chars and few attempts have been made to investigate the CO 2 gasification reactivity of WEEE plastic chars derived from the medium-temperature pyrolysis (Gil, Fermoso, Pevida, Pis & Rubiera 2010). Additionally, the CO 2 gasification reactivity of chars is lower than that of O 2 or H 2 O gasification, and consequently, it is regarded as the rate-determining step in the gasification process .…”

Section: Introductionmentioning

confidence: 99%

The CO2 Gasification Kinetic Study of WEEE Plastic Char Derived from Medium Temperature pyrolysis

H¹

2015

EER

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The isothermal CO 2 gasification characteristics of three chars derived from medium temperature pyrolysis of waste electrical and electronic equipment (WEEE) plastics were studied by using a thermogravimetric analyzer (TGA) within the temperature range of 850−1050°C. Phenolic board (PB), brominated high impact polystyrene (HIPS) and acrylonitrile butadiene styrene (ABS) plastics are widely used for the electric and electronic equipment and were employed as model WEEE plastics for the char sample production in this study. The effects of their physicochemical properties and gasification temperature on the WEEE plastic chars conversion rate, the reactivity indexes and the gasification rate were investigated in detail. The random pore model (RPM), the extended random pore model (eRPM) and the shifted extended random pore model (s-eRPM) have been employed to fit the CO 2 gasification rate curve of WEEE plastic chars, respectively. The kinetic parameters and the correlation coefficients (R 2 ) were evaluated by RPM, eRPM and s-eRPM, respectively. It was found that the CO 2 gasification reactivity of PB char was the highest, followed by that of HIPS char and the gasification reactivity of ABS char was the lowest, which have a close relationship with their pore and carbon crystal structure properties. In addition, it was found that RMP could fit the gasification reaction rate of HIPS char well whose maximum reaction rate appeared at the char conversion of approximate 0.4. Nevertheless, as for PB char and ABS char, their maximum gasification rate presented at char conversion of around 0.8 and 0.2, respectively. And it was observed that eRMP and s-eRPM could predict their gasification rate of PB char and ABS char very well with higher R 2 , respectively.

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Intrinsic char reactivity of plastic waste (PET) during CO2 gasification

Cited by 32 publications

References 34 publications

Effect of metal content on CO<sub>2</sub> gasification behavior of K- and Fe-loaded bio-chars

Effect of metal content on CO<sub>2</sub> gasification behavior of K- and Fe-loaded bio-chars

Brown coal char CO₂‐gasification kinetics with respect to the char structure part II: Kinetics and correlations

The CO2 Gasification Kinetic Study of WEEE Plastic Char Derived from Medium Temperature pyrolysis

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Intrinsic char reactivity of plastic waste (PET) during CO2 gasification

Cited by 32 publications

References 34 publications

Effect of metal content on CO<sub>2</sub> gasification behavior of K- and Fe-loaded bio-chars

Effect of metal content on CO<sub>2</sub> gasification behavior of K- and Fe-loaded bio-chars

Brown coal char CO2‐gasification kinetics with respect to the char structure part II: Kinetics and correlations

The CO2 Gasification Kinetic Study of WEEE Plastic Char Derived from Medium Temperature pyrolysis

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Brown coal char CO₂‐gasification kinetics with respect to the char structure part II: Kinetics and correlations