Pyrolysis of eucalyptus at different heating rates: studies of char characterization and oxidative reactivity

Guerrero, Marta; Ruiz, M. Pilar; Alzueta, María U.; Bilbao, Rafael; Millera, Ángela

doi:10.1016/j.jaap.2004.12.008

Cited by 167 publications

(140 citation statements)

References 30 publications

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“…It has been reported that char surface area greatly depended on treatment temperature during biomass pyrolysis [19]. Thus the relatively low surface area of P700 accorded with previous reports that high temperature was unfavorable for the porous structure of the char [7,8,21]. Due to the high temperature and long residence time, the porous structure cracked 200 1200 2200 3200 4200…”

Section: Surface Property Analysissupporting

confidence: 66%

“…As expected, the content of ash and carbon in H300 and P700 was much higher and the content of hydrogen and oxygen was much lower than the raw pinewood. The higher content hydrogen and oxygen in H300 indicated that more activated sites available and stable carbon-oxygen complex existed on the H300 surface than P700 [21]. The higher value of C/O and C/H in P700 than H300 indicated that pyrolysis at 700°C underwent a deeper carbonization process than hydrothermal treatment at 300°C.…”

Section: Chemical Composition Analysismentioning

confidence: 99%

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Characterization and application of chars produced from pinewood pyrolysis and hydrothermal treatment

Liu

Zhang

2010

Fuel

447

124

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a b s t r a c tTwo types of pinewood chars, hydrothermal char (H300) and pyrolytic char (P700) from biomass-toenergy conversion were characterized and used as adsorbent for the copper removal from aqueous solution. The result showed that the pinewood underwent a deeper carbonization during pyrolysis process and more activated sites available and stable carbon-oxygen complex existed after hydrothermal treatment. Comparing with raw pinewood, hydrothermal treatment increased 95% total oxygen-containing groups (carboxylic, lactone and phenolic group) while 56% oxygen-containing groups decreased after pyrolysis process. SEM analysis indicated that both hydrothermal and pyrolytic processes developed rough surface with new cavities on the chars, and the BET surface area were 21 and 29 m 2 /g for H300 and P700, respectively. Although H300 had lower surface area, its adsorption capacity for copper was much higher than P700 since ion-exchange reaction was the predominant removal mechanism by H300, while physical adsorption dominated by P700. The adsorption data could be well described by Langmuir isotherm model for copper onto both H300 and P700.

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Section: Surface Property Analysissupporting

confidence: 66%

Section: Chemical Composition Analysismentioning

confidence: 99%

Characterization and application of chars produced from pinewood pyrolysis and hydrothermal treatment

Liu

Zhang

2010

Fuel

447

124

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“…In addition, pyrolysis of smaller particles (0.5 to 1 mm) improved the char reactivity for combustion or gasification [20]. Results found by Guerrero et al [1] showed that the reactivity to oxygen of the char produced by eucalyptus pyrolysis increases with the heating rate of biomass particles.…”

Section: Introductionmentioning

confidence: 91%

“…The necessity for alternative energy sources has caused renewed interest in the use of biomass, since this renewable fuel does not contribute to increased CO 2 concentration in the atmosphere [1,2]. Because of tension on petroleum cost, second generation biofuels produced by Fischer-Tropsch synthesis after biomass gasification show an increasing interest.…”

Section: Introductionmentioning

confidence: 99%

Pyrolysis of wood at high temperature: The influence of experimental parameters on gaseous products

Commandré

Lahmidi

Salvador

et al. 2011

Fuel Processing Technology

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The pyrolysis of wood was carried out in an Entrained Flow Reactor at high temperature (650 to 950°C) and under rapid heating conditions (N 10 3 K s − 1 ). The influence of the diameter and initial moisture of the particle, reactor temperature, residence time and the nature of the gaseous atmosphere on the composition of the gaseous products has been characterised. Particle size, between 80-125 and 160-200 μm, did not show any impact. Pyrolysis and tar cracking essentially happen in very short time period: less than 0.6 s; the products yields are only slightly modified after 0.6 s in the short residence times (several seconds) of our experiments. Higher temperatures improve hydrogen yield in the gaseous product while CO yield decreases. Under nitrogen atmosphere, after 2 s at 950°C, 76% (daf) of the mass of wood is recovered as gases: CO, CO 2 , H 2 , CH 4 , C 2 H 2 , C 2 H 4 and H 2 O. Tests performed under steam partial pressure showed that hydrogen production is slightly enhanced.

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“…The mass of the residual char is known to depend on the tem perature and on the pyrolysis heating rate [2,4,18]. The final tem perature was the same in the two experiments.…”

Section: Final Char Yieldmentioning

confidence: 99%

Effects of CO2 on biomass fast pyrolysis: Reaction rate, gas yields and char reactive properties

Guizani

Sanz

Salvador

2014

Fuel

134

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. Effects of CO2 on biomass fast pyrolysis : reaction rate, gas yields and char reactive properties. Fuel, Elsevier, 2014, 116, pp.310-320. 10.1016/j.fuel.2013 Effects of CO 2 on biomass fast pyrolysis: Reaction rate, gas yields and char reactive properties t r a c tThe effect of CO 2 introduction in a biomass fast pyrolysis process at 850°C was investigated. It was found that CO 2 impacts the final gas yield and composition, and the char yield and properties. Introducing CO 2 in the pyrolysis medium alongside nitrogen enhanced CO production as a result of homogeneous and het erogeneous reactions of CO 2 with gases, tars and char. The char yield was lower compared to a reference char yield in pure nitrogen. The char obtained in a CO 2 containing atmosphere has its surface area increased nearly sixfold and has a chemical composition different from that of chars obtained in N 2 atmo sphere. However, the reactivity of the two chars towards H 2 O, CO 2 and O 2 was almost the same. Temper ature programmed oxidation experiments on both chars those obtained in pure nitrogen and those obtained in a CO 2 containing atmosphere revealed quite different oxidation profiles and peak temper atures. Taken together, these results tend to confirm that CO 2 is impacting the biomass fast pyrolysis pro cess. In the light of these results and of the literature findings, we propose a mechanism illustrating the role of CO 2 during fast pyrolysis of biomass.

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Pyrolysis of eucalyptus at different heating rates: studies of char characterization and oxidative reactivity

Cited by 167 publications

References 30 publications

Characterization and application of chars produced from pinewood pyrolysis and hydrothermal treatment

Characterization and application of chars produced from pinewood pyrolysis and hydrothermal treatment

Pyrolysis of wood at high temperature: The influence of experimental parameters on gaseous products

Effects of CO2 on biomass fast pyrolysis: Reaction rate, gas yields and char reactive properties

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