Pyrolysis of various biomass residues and char utilization for the production of activated carbons

González, J.F.; Román, S.; Martín, Juan Vicente González; Martínez, Guadalupe

doi:10.1016/j.jaap.2008.11.035

Cited by 267 publications

(131 citation statements)

References 36 publications

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“…Pulverized bio-char had a somewhat higher HHV, and this could due to its higher fixed carbon content, lower ash content and fine particle size. The trends were similar to those in bio-char produced from walnut shells and olive stones (Gonzalez et al 2009;Ronsse et al 2013).…”

Section: Higher Heating Valuesupporting

confidence: 71%

Effects of Temperature and Heating Rate on the Characteristics of Molded Bio-char

Li¹,

Liu²,

Wang³

et al. 2016

BioResources

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A slow pyrolysis of pinewood was investigated in this paper. Through the briquette process, the pinewood sawdust becomes molded biomass. The molded bio-char was produced from molded biomass with different pyrolysis factors, and the bio-char's heating value, char yield rates, and physicochemical and morphological properties were investigated. Molded bio-char's characteristics depended principally on pyrolysis factors. At low temperature (400 °C), the char yield rate was positively correlated to the heating rate. But at higher temperatures (500 to 700 °C), the char yield rates decreased as heating rates increased. As pyrolysis temperature increased from 400 to 700 °C, the following increased in molded bio-char: fixed-carbon content, percentage carbon, heating value, ash content, as well as surface areas. And its pore structure, graphite degree, and polymerization degree achieved a higher level. Compared with pulverized bio-char, the molded bio-char had a higher char yield rate, ash content, graphite degree, and structure ordering. The molded bio-char obtained from a low temperature (400 °C) and high heating rate (15 °C/min) can be used as a reducing agent, the molded bio-char from 600 °C is recommend as an activated carbon precursor, and the molded bio-chars from low temperature (400 °C) have a higher efficiency as fuel.

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Section: Higher Heating Valuesupporting

confidence: 71%

Effects of Temperature and Heating Rate on the Characteristics of Molded Bio-char

Li¹,

Liu²,

Wang³

et al. 2016

BioResources

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“…However, there are significant differences in the N 2 adsorption volumes and the exact shape of the isotherms, depending on the weight ratio of KOH/sample. The isotherm of CSC-B exhibits a high volume of nitrogen adsorption and a narrow pore size distribution, which appears to imply that relative high ratio of KOH/sample is conducive for the development of microporosity [18]. S BET and V T are directly related to the development of porosity of activated carbons.…”

Section: Morphology and Pore Structure Properties Of Coconut Shell Camentioning

confidence: 93%

Adsorption Studies of Coconut Shell Carbons Prepared by KOH Activation for Removal of Lead(II) From Aqueous Solutions

et al. 2013

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Abstract:Removal of Pb 2+ from aqueous solutions using coconut shell carbons produced by KOH activation is performed in this paper. Morphology and pore structure characteristic of coconut shell carbons are analyzed by SEM and nitrogen adsorption techniques. Effects of adsorbent concentration, agitation time and initial ion concentration on the adsorption behavior are investigated, and adsorption isotherm and kinetics on coconut shell carbons are also studied. The results show that high weight ratio of KOH/sample is favorable to produce rich porous structure. The resultant coconut shell carbons with a high specific surface area of 1135 m 2 /g is obtained and demonstrates good adsorption potential on removal of Pb 2+ from aqueous solutions. Adsorption data fit well with Freundlich and Halsey isotherms. The kinetic studies indicate that adsorption behavior can be described by pseudo-second-order kinetic model, which also follows external diffusion and intra-particle diffusion in the adsorption process.

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“…Lignin is more stable than cellulose and hemicelluloses, and decomposes at a temperature range of 280-800°C [11]. The minor extractives of inorganic constituents and their catalytic effects also influence the weight loss of biomass during pyrolysis [12]. Significant weight loss was observed between 275°C and 520°C, and is due to decomposition of the main components of the pistachio nutshells and removal of the gaseous volatile matter from the structure.…”

Section: Textural Characterization Of Activated Carbonsmentioning

confidence: 99%

Removal of deltamethrin insecticide over highly porous activated carbon prepared from pistachio nutshells

Hassan¹,

Youssef²,

Priecel³

2013

Carbon letters

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Potassium hydroxide-activated carbons (CK21, CK11, and CK12) were prepared from pistachio nutshells. Physicochemical properties of activated carbons were characterized by TGA, pH pzc , Fourier transform infrared spectroscopy, scanning electron microscopy, and N 2 -adsorption at -196°C. The examinations showed that activated carbons have high surface area ranging between 695-1218 m 2 /g, total pore volume ranging between 0.527-0.772 mL/g, and a pore radius around 1.4 nm. The presence of acidic and basic surface C-O groups was confirmed. Batch adsorption experiments were carried out to study the effects of adsorbent dosage, temperature, initial concentration of adsorbate, and contact time on deltamethrin adsorption by activated carbons. The kinetic studies showed that the adsorption data followed a pseudo-second order kinetic model. The Langmuir model showed a maximum adsorption capacity of 162.6 mg/g at 35°C on CK12. Thermodynamic studies indicated that adsorption was spontaneous and increased with temperature, suggesting an endothermic process.

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Pyrolysis of various biomass residues and char utilization for the production of activated carbons

Cited by 267 publications

References 36 publications

Effects of Temperature and Heating Rate on the Characteristics of Molded Bio-char

Effects of Temperature and Heating Rate on the Characteristics of Molded Bio-char

Adsorption Studies of Coconut Shell Carbons Prepared by KOH Activation for Removal of Lead(II) From Aqueous Solutions

Removal of deltamethrin insecticide over highly porous activated carbon prepared from pistachio nutshells

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