Kinetic study of catalytic gasification of wood char impregnated with different alkali salts

Kirtania, Kawnish; Axelsson, J.; Μάτσακας, Λεωνίδας; Christakopoulos, Paul; Umeki, Kentaro; Furusjö, Erik

doi:10.1016/j.energy.2016.10.134

Cited by 72 publications

(68 citation statements)

References 34 publications

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“…9 Several papers were published in the last two years, too, in this field. [10][11][12][13][14][15][16] The results of these works, however, do not show a coherent picture. Among others they report activation energies from 93 till 355 kJ/mol.…”

Section: Introductionmentioning

confidence: 87%

CO₂ Gasification of Chars Prepared by Fast and Slow Pyrolysis from Wood and Forest Residue: A Kinetic Study

Wang

Várhegyi

et al. 2018

Energy Fuels

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The CO2 gasification of chars was investigated by thermogravimetry (TGA). The chars were prepared from spruce and its forest residue. Prior to the gasification the raw materials were pelletized and pulverized. Part of the samples was directly gasified in the TGA when the char was formed at low heating rates before the gasification. Another sort of char was prepared in a drop tube reactor (DTR) at a heating rate of around 1×10 4 °C/s and a residence time of 0.2 s at 1200°C. The kinetic evaluation was based on TGA experiments with linear, modulated, and constant-reaction rate (CRR) temperature programs. The gasification of the DTR chars took place at temperatures 80-100°C lower than the chars formed at low heating rates. The chars formed at low heating rates exhibited a side reaction that occurred 80-100 °C below the main peak of the mass-loss rate curves during the gasification. Accordingly the gasification kinetics of these chars was described by assuming two pseudo-components. The thermal annealing (thermal deactivation) of the chars during the gasification experiments was taken into account by the pre-exponential factors which were allowed to have different values at different temperature programs. A strong compensation effect was observed between the activation energy (E) and the rest of the kinetic parameters. Nevertheless, the obtained E values varied in a narrow interval (from 219 till 227 kJ/mol) and were very close to the ones obtained for other chars with similar kinetic evaluation procedures (Wang et al.,

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Section: Introductionmentioning

confidence: 87%

CO₂ Gasification of Chars Prepared by Fast and Slow Pyrolysis from Wood and Forest Residue: A Kinetic Study

Wang

Várhegyi

et al. 2018

Energy Fuels

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“…Most studies related to the impact of inorganics in the gasification behavior of biomasses use impregnation techniques to modify the composition of the samples [8,[12][13][14][15]. In general, these treatments allow a good understanding of the effects of inorganics on gasification.…”

Section: Introductionmentioning

confidence: 99%

Steam gasification behavior of tropical agrowaste: A new modeling approach based on the inorganic composition

Millán

Vargas

Nzihou

2019

Fuel

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The steam gasification and co-gasification reactivity and kinetics of coconut shells, oil palm shells and bamboo guadua were studied from an isothermal thermogravimetric analysis, with temperatures ranging from 750°C to 900°C, and steam partial pressures from 3 to 10 kPa. In the analyzed experimental range, inorganics were identified as the most influential parameter in biomass reactivity and kinetics. Accordingly, a new modeling approach is proposed to predict the gasification behavior of lignocellulosic agrowaste based on their inorganic composition. A good agreement between the experimental and modeled data was found, showing that the proposed approach is suitable for the description and prediction of the gasification behavior of biomasses with different macromolecular structure and within a wide range of inorganic composition, and H/C and O/C ratios near 1.5 and 0.8 respectively. This kinetic model could constitute a valuable tool for reactor design and scale-up of steam gasification facilities using tropical lignocellulosic feedstocks.

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“…Extensive studies 26 , 27 have demonstrated that alkali metals and alkali earth metals can enhance gasification, including promoted gasification rate, increased char conversion, reduced soot and tar formation. Umerki et al 28 found that K can suppress the polycyclic aromatic hydrocarbon formations and promoted light tar decomposition.…”

Section: Introductionmentioning

confidence: 99%

Alkaline thermal treatment of seaweed for high-purity hydrogen production with carbon capture and storage potential

2020

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Current thermochemical methods to generate H 2 include gasification and steam reforming of coal and natural gas, in which anthropogenic CO 2 emission is inevitable. If biomass is used as a source of H 2 , the process can be considered carbon-neutral. Seaweeds are among the less studied types of biomass with great potential because they do not require freshwater. Unfortunately, reaction pathways to thermochemically convert salty and wet biomass into H 2 are limited. In this study, a catalytic alkaline thermal treatment of brown seaweed is investigated to produce high purity H 2 with substantially suppressed CO 2 formation making the overall biomass conversion not only carbon-neutral but also potentially carbon-negative. High-purity 69.69 mmol-H 2 /(dry-ash-free)g-brown seaweed is produced with a conversion as high as 71%. The hydroxide is involved in both H 2 production and in situ CO 2 capture, while the Ni/ZrO 2 catalyst enhanced the secondary H 2 formation via steam methane reforming and water-gas shift reactions.

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Kinetic study of catalytic gasification of wood char impregnated with different alkali salts

Cited by 72 publications

References 34 publications

CO₂ Gasification of Chars Prepared by Fast and Slow Pyrolysis from Wood and Forest Residue: A Kinetic Study

CO₂ Gasification of Chars Prepared by Fast and Slow Pyrolysis from Wood and Forest Residue: A Kinetic Study

Steam gasification behavior of tropical agrowaste: A new modeling approach based on the inorganic composition

Alkaline thermal treatment of seaweed for high-purity hydrogen production with carbon capture and storage potential

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Kinetic study of catalytic gasification of wood char impregnated with different alkali salts

Cited by 72 publications

References 34 publications

CO2 Gasification of Chars Prepared by Fast and Slow Pyrolysis from Wood and Forest Residue: A Kinetic Study

CO2 Gasification of Chars Prepared by Fast and Slow Pyrolysis from Wood and Forest Residue: A Kinetic Study

Steam gasification behavior of tropical agrowaste: A new modeling approach based on the inorganic composition

Alkaline thermal treatment of seaweed for high-purity hydrogen production with carbon capture and storage potential

Contact Info

Product

Resources

About

CO₂ Gasification of Chars Prepared by Fast and Slow Pyrolysis from Wood and Forest Residue: A Kinetic Study

CO₂ Gasification of Chars Prepared by Fast and Slow Pyrolysis from Wood and Forest Residue: A Kinetic Study