Pyrolytic characteristics and kinetic studies of three kinds of red algae

Li, Demao; Chen, Limei; Zhang, Xiaowen; Ye, Naihao; Xing, Fuguo

doi:10.1016/j.biombioe.2011.01.011

Cited by 137 publications

(59 citation statements)

References 32 publications

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“…The small mass loss (around 5 wt%) observed in this region for H-, Na-and Cu-Alg is attributed to simple loss of moisture, which had re-absorbed following drying to a constant weight at 1058C prior to the TGA, consistent with the hygroscopic nature of these materials [24,28,[52][53][54]. This is in agreement with the large endothermic peak during this temperature region on the DSC curve featured in figure 6, which results from water evaporating from the sample.…”

Section: Pyrolysis Of Alginic Acid and Alginatesmentioning

confidence: 55%

Copper(II)-mediated thermolysis of alginates: a model kinetic study on the influence of metal ions in the thermochemical processing of macroalgae

et al. 2013

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Thermochemical processing methods such as pyrolysis are of growing interest as a means of converting biomass into fuels and commodity chemicals in a sustainable manner. Macroalgae, or seaweed, represent a novel class of feedstock for pyrolysis that, owing to the nature of the environments in which they grow coupled with their biochemistry, naturally possess high metal contents. Although the impact of metals upon the pyrolysis of terrestrial biomass is well documented, their influence on the thermochemical conversion of marine-derived feeds is largely unknown. Furthermore, these effects are inherently difficult to study, owing to the heterogeneous character of natural seaweed samples. The work described in this paper uses copper(II) alginate, together with alginic acid and sodium alginate as model compounds for exploring the effects of metals upon macroalgae thermolysis. A thermogravimetric analysis–Fourier transform infrared spectroscopic study revealed that, unusually, Cu 2+ ions promote the onset of pyrolysis in the alginate polymer, with copper(II) alginate initiating rapid devolatilization at 143°C, 14°C lower than alginic acid and 61°C below the equivalent point for sodium alginate. Moreover, this effect was mirrored in a sample of wild Laminaria digitata that had been doped with Cu 2+ ions prior to pyrolysis, thus validating the use of alginates as model compounds with which to study the thermolysis of macroalgae. These observations indicate the varying impact of different metal species on thermochemical behaviour of seaweeds and offer an insight into the pyrolysis of brown macroalgae used in phytoremediation of metal-containing waste streams.

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Section: Pyrolysis Of Alginic Acid and Alginatesmentioning

confidence: 55%

Copper(II)-mediated thermolysis of alginates: a model kinetic study on the influence of metal ions in the thermochemical processing of macroalgae

et al. 2013

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“…Table 2 shows that the beginning of the decomposition occurs at about 190°C, with a lower temperature than terrestrial biomass with a high content of cellulose (straws and grasses) [2] or lignin (woody biomass) [5] at the same heating rate. Moreover, the temperature range of pyrolysis and the total mass of volatile matter for Jerusalem artichoke were all similar with those obtained from red [16] and marine algae samples [17].…”

Section: Characteristics Of the Thermal Degradation Processmentioning

confidence: 73%

“…2a) and DTG (Fig. 2b) curves of the tuber samples exhibited two mass loss steps, with a similar pattern like three red algae [16]. Two peaks were observed in DTG curves, with the peak temperature at T 2 and T 3 , and the rate of mass loss reached maximum at T 2 .…”

Section: Characteristics Of the Thermal Degradation Processmentioning

confidence: 89%

Thermogravimetric and kinetic analysis of energy crop Jerusalem artichoke using the distributed activation energy model

Wang

et al. 2013

J Therm Anal Calorim

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Jerusalem artichoke has great potential as future feedstock for bioenergy production because of its high tuber yield (up to 90 t ha -1 ), appropriate biomass characteristics, low input demand, and positive environmental impact. The pyrolytic and kinetic characteristics of Jerusalem artichoke tubers were analyzed at heating rates of 5, 10, 20 and 30°C min -1 . TG and DTG curves in an inert (nitrogen) atmosphere suggested that there were three distinct stages of mass loss and the major loss occurs between about 190-380°C. Heating rate brought a lateral shift toward right in the temperature. And, it not only affects the temperature at which the highest mass loss rate reached, but also affect the maximum rate of mass loss. The distributed activation energy model (DAEM) was used to study the pyrolysis kinetics and provided reasonable fits to the experimental data. The activation energy (E) of tubers ranged from 146.40 to 232.45 kJ mol -1 , and the frequency factor (A) changed greatly corresponding to E values at different mass conversion.

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“…It has been found that for thermal decomposition reactions, the kinetic parameters, such as the pre-exponential factor A and the activation energy E, exhibit the following relationship (Cai and Bi 2009;Li et al 2011):…”

Section: Kinetic Compensation Effect In Pyrolysis Of MLmentioning

confidence: 99%

Thermal decomposition characteristics and kinetics of methyl linoleate under nitrogen and oxygen atmospheres

et al. 2015

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The thermal decomposition characteristics of methyl linoleate (ML) under nitrogen and oxygen atmospheres were investigated, using a thermogravimetric analyzer at a heating rate of 10°C/min from room temperature to 600°C. Furthermore, the pyrolytic and kinetic characteristics of ML at different heating rates were studied. The results showed that the thermal decomposition characteristics of ML under nitrogen and oxygen atmospheres were macroscopically similar, although ML exhibited relatively lower thermal stability under an oxygen atmosphere than under a nitrogen atmosphere. The initial decomposition temperature, the maximum weight loss temperature, the peak decomposition temperature, and the rate of maximum weight loss of ML under an oxygen atmosphere were much lower than those under a nitrogen atmosphere and increased with increasing heating rates under either oxygen or nitrogen atmosphere. In addition, the kinetic characteristics of thermal decomposition of ML were elucidated based on the experimental results and by the multiple linear regression method. The activation energy, pre-exponential factor, reaction order, and the kinetic equation for thermal decomposition of ML were obtained. The comparison of experimental and calculated data and the analysis of statistical errors of pyrolysis ratios demonstrated that the kinetic model was reliable for pyrolysis of ML with relative errors of about 1 %. Finally, the kinetic compensation effect between the preexponential factors and the activation energy in the pyrolysis of ML was also confirmed.

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Pyrolytic characteristics and kinetic studies of three kinds of red algae

Cited by 137 publications

References 32 publications

Copper(II)-mediated thermolysis of alginates: a model kinetic study on the influence of metal ions in the thermochemical processing of macroalgae

Copper(II)-mediated thermolysis of alginates: a model kinetic study on the influence of metal ions in the thermochemical processing of macroalgae

Thermogravimetric and kinetic analysis of energy crop Jerusalem artichoke using the distributed activation energy model

Thermal decomposition characteristics and kinetics of methyl linoleate under nitrogen and oxygen atmospheres

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