The CO2 gasification kinetics of olive residue

Ollero, P.; Serrera, A.; Arjona, Rosario; Alcantarilla, S.

doi:10.1016/s0961-9534(02)00091-0

Cited by 170 publications

(111 citation statements)

References 16 publications

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“…Table 1 presents the ash elemental composition of the three fuels studied in this work, expressed as metallic oxides, and determined by atomic absorption spectrophotometry, except for Na and K, which were determined by atomic emission. In this table, it can be observed that, among the catalytically active elements that may be present in the mineral matter of biomass fuels, the potassium content of the olive stones (OS) is much higher than that of chestnut (CH), which might explain its much higher reactivity, as has been pointed out by other authors [31,32]. Di Blasi [33] also observed a high reactivity in olive stones due to a catalytic effect associated to the high alkali content of the samples, especially potassium, during their combustion and gasification.…”

Section: Thermogravimetric Characteristics Of the Char Samples Under mentioning

confidence: 76%

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

Fermoso

Gil

Pevida

et al. 2010

Chemical Engineering Journal

116

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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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Section: Thermogravimetric Characteristics Of the Char Samples Under mentioning

confidence: 76%

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

Fermoso

Gil

Pevida

et al. 2010

Chemical Engineering Journal

116

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“…Reactivities at 10% or 50% of char conversion are often used for the determination of the kinetic parameters; the latter is actually the most commonly selected parameter in several similar investiga tions [26,27,7]. In our study, reactivity at 50% conversion level is taken as a reference.…”

Section: Methods Of Data Analysismentioning

confidence: 99%

“…For instance, some authors referred to a (0.2 0.8) conversion range with a reference at X 0.2 [36], others chose ranges between (0.2 0.8) and (0.15 0.9) with a reference reactivity at X 0.5 [26,23]. In our study, FðXÞ is determined in the conver sion level range of 0.2 0.9.…”

Section: Fðxþmentioning

confidence: 99%

The gasification reactivity of high-heating-rate chars in single and mixed atmospheres of H2O and CO2

Guizani

Sanz

Salvador

2013

Fuel

141

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. The gasification reactivity of high-heating-rate chars in single and mixed atmospheres of H2O and CO2. Fuel, Elsevier, 2013, 108, pp.812-823. 10.1016/j.fuel.2013 The gasification reactivity of high-heating-rate chars in single and mixed atmospheres of H 2 O and CO 2 C. Guizani ⇑ , F.J. Escudero Sanz, S. Salvador t r a c tGasification reactivity of high heating rate chars (HHR chars) in steam, carbon dioxide and their mix tures was investigated in a new macro TG experimental device. The higher reactivity of the HHR chars was highlighted by a comparison with reference chars prepared at a low heating rate (LHR chars). It was found that the char reactivity in a mixed atmosphere of steam and carbon dioxide can be expressed as the sum of the individual reactivities obtained in single atmosphere gasification experiments. This result was not dependent on the pyrolysis heating rate. In addition, gas alternation gasification experi ments for both HHR chars and LHR chars showed that gasifying the char with CO 2 up to 30% of con version does not affect its reactivity to H 2 O. Altogether, the results tend to indicate that the two reactant gases H 2 O and CO 2 react on separate active sites when mixed atmospheres are used, and that CO 2 does not affect the char structure to favor or inhibit the char H 2 O gasification reaction.

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“…3 When the experimental conditions allow the C + CO2 2 CO reaction to proceed in both directions, the Langmuir-Hinshelwood kinetics is employed usually. [4][5][6][7][8] If the reaction is far from the equilibrium, then the kinetics usually can be well described by the following type of equations: 6,[9][10][11] d/dt  A exp(-E/RT) f() PCO 2…”

Section: Introductionmentioning

confidence: 99%

CO₂ Gasification of Biomass Chars: A Kinetic Study

et al. 2008

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ABSTRACT. The CO2 gasification of pine and birch charcoals was studied by TGA at CO2 partial pressures of 51 and 101 kPa. Linear and stepwise heating programs were employed to increase the information content of the experimental data sets. Low sample masses were used due to the high enthalpy change.Seven experiments with different experimental conditions were evaluated simultaneously for each sample. The method of least squares was employed. Three reactions appeared in the temperature domain evaluated (600 -1000°C). The first and second reactions were due to the devolatilization and did not show a significant dependence on the CO2 concentration. They were approximated by first order kinetics. The 3rd reaction corresponded to the gasification. Its modeling 2 was based on an empirical approximation of the change of the reaction surface during the gasification and by a formal reaction order with respect to the CO2 concentration. Very close results were obtained for the two charcoals. The dependence on the conversion could be well approximated by power law kinetics. In the next step of the evaluation, the experiments of the two samples (14 experiments combined) were evaluated together, assuming common activation energy values and a common reaction order with respect to the CO2 concentration. This process led to nearly the same fit as the separate evaluation of the two samples. The activation energy of the gasification step was 262 kJ/mol. The reaction order of CO2 was 0.40.

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The CO2 gasification kinetics of olive residue

Cited by 170 publications

References 16 publications

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

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

The gasification reactivity of high-heating-rate chars in single and mixed atmospheres of H2O and CO2

CO₂ Gasification of Biomass Chars: A Kinetic Study

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The CO2 gasification kinetics of olive residue

Cited by 170 publications

References 16 publications

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

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

The gasification reactivity of high-heating-rate chars in single and mixed atmospheres of H2O and CO2

CO2 Gasification of Biomass Chars: A Kinetic Study

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Product

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CO₂ Gasification of Biomass Chars: A Kinetic Study