High-pressure gasification reactivity of biomass chars produced at different temperatures

Fermoso, Javier; Stevanov, C.; Moghtaderi, Behdad; Arias, B.; Pevida, C.; Plaza, M.G.; Rubiera, F.; Pís, J.J.

doi:10.1016/j.jaap.2008.09.017

Cited by 114 publications

(73 citation statements)

References 18 publications

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“…For K-loaded chars, a maximum value (274 kJ mol −1 ) was observed for K10. In the CO 2 gasification of bio-chars derived from pine, which is similar to the Douglas fir employed in the present study, activation energies of 134-259.4 kJ mol −1 have been reported (Senneca, 2007, Fermoso, et al, 2009, Seo, et al, 2010. These values are comparable to those for K0 and Fe0 (161-177 kJ mol −1 ).…”

Section: Pore Parameters Of the Catalyst-loaded Charsupporting

confidence: 80%

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: Pore Parameters Of the Catalyst-loaded Charsupporting

confidence: 80%

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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“…By using the Arrhenius equation, the following expression can be derived [10][11][12][13][14][15][16][17][18][19]:…”

Section: Solid Phase Analysismentioning

confidence: 99%

The Boudouard–Bell reaction analysis under high pressure conditions

Mianowski

Robak

Tomaszewicz

et al. 2012

J Therm Anal Calorim

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A new method for the measurement of solid fuel reactivity towards carbon dioxide has been developed. This new method takes into account high-pressure and temperature effects. Three devolatilized carbonaceous materials have been used in experiments: chars derived from lignite, bituminous coal and blast furnace coke. Processes were carried out at temperatures of 800, 850 and 900°C and pressures of 1.52, 2.5 and 3.4 MPa. Analysis of the product gas composition was carried out with the maximum degree of conversion of CO 2 (a m ) proposed as a representative reactivity parameter. Arrhenius and Eyring relationships have been analyzed, and values of the activation energy and activation volume have been calculated.

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“…There are several studies on coal gasification kinetics [15][16][17] and some on biomass gasification kinetics [4,[18][19]. However, coal-biomass blends gasification has hardly been studied at all.…”

Section: Introductionmentioning

confidence: 99%

Kinetic models comparison for non-isothermal steam gasification of coal–biomass blend chars

Fermoso

Gil

Pevida

et al. 2010

Chemical Engineering Journal

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121

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The non-isothermal thermogravimetric method (TGA) was applied to a bituminous coal (PT), two types of biomass, chestnut residues (CH) and olive stones (OS), and coalbiomass blends in order to investigate their thermal reactivity under steam. Fuel chars were obtained by pyrolysis in a fixed-bed reactor at a final temperature of 1373 K for 30 min. The gasification tests were carried out by thermogravimetric analysis from room temperature to 1373 K at heating rates of 5, 10 and 15 K min -1 . After blending, no significant interactions were detected between PT and CH during co-gasification, whereas deviations from the additive behaviour were observed in the PT-OS blend.However, for the two coal-biomass blends, the gasification behaviour resembled that of the individual coal, as this component constituted the larger proportion of the blend. The temperature-programmed reaction (TPR) technique was employed at three different heating rates to analyze noncatalytic gas-solid reactions. Three nth-order representative gas-solid models, the volumetric model (VM), the grain model (GM) and the random pore model (RPM) were applied in order to describe the reactive behaviour of the chars during steam gasification. From these models, the kinetic parameters were determined.The best model for describing the reactivity of the PT, PT-CH and PT-OS samples was the RPM model. VM was the model that best fitted the CH sample, whereas none of the models was suitable for the OS sample.

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High-pressure gasification reactivity of biomass chars produced at different temperatures

Cited by 114 publications

References 18 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

The Boudouard–Bell reaction analysis under high pressure conditions

Kinetic models comparison for non-isothermal steam gasification of coal–biomass blend chars

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