Biomass Chars: Elaboration, Characterization and Applications

Jeguirim, Mejdi; Limousy, Lionel

doi:10.3390/en10122040

Cited by 9 publications

(1 citation statement)

References 15 publications

(28 reference statements)

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“…Biochar is considered as a cheap environmentally friendly adsorbent with a developed porous structure and a high content of oxygen-containing surface functional groups. In addition, it also used to increase soil fertility and for remediation, for wastewater treatment, as a feedstock for activated carbons, as well as an energy carrier with a higher calorific value and density than the feedstock [1,2]. Biochar from plant biomass can be obtained by gasification [3], hydrothermal carbonization [4] as well as various types of pyrolysis -torrefaction [5], slow and fast pyrolysis with both the conventional heating [6,7], and microwave one [8].…”

Section: Introductionmentioning

confidence: 99%

Green approach to production of porous char adsorbents via oxidative carbonization in fluidized catalyst bed

Yeletsky,

Yazykov,

Dubinin

et al. 2024

Nanosystems: Phys. Chem. Math.

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A green and energy-efficient technique for production of porous carbon-mineral chars from agricultural wastes (rice husk, wheat bran) and sedimentary carbonaceous feedstocks (high-ash peat, coal) was developed. It is based on partial combustion in fluidized bed of a deep oxidation catalyst at low temperatures (465 -600 • C). This technique yields porous chars with an elevated mineral content that depends on a feedstock used, and gaseous products of complete oxidation. It was found that the obtained chars have developed porosity with BET specific surface area of ca. 50 -170 m 2 g −1 , pore volume of 0.05 -0.17 ml•g −1 , and ash content of 16 -79 wt. %. They were additionally characterized by TGA and FTIR. Their testing as adsorbents for heavy metal ions (by the example of Cu 2+ ) and organic dyes (by the example of methyl green) revealed that their adsorption capacities are comparable to those of chars produced by the conventional pyrolytic approaches. KEYWORDS biochar, biomass, rice husk, bran, fluidized catalyst bed, composite

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Section: Introductionmentioning

confidence: 99%

Green approach to production of porous char adsorbents via oxidative carbonization in fluidized catalyst bed

Yeletsky,

Yazykov,

Dubinin

et al. 2024

Nanosystems: Phys. Chem. Math.

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Pine cone pyrolysis: Optimization of temperature for energy recovery

Boutaieb

Guiza

Román

et al. 2019

Env Prog and Sustain Energy

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In this work, the pine cones pyrolysis (a mixture of both scales and axis) was investigated under different temperature (500–800°C) at a bench scale fixed bed reactor operating in batch mode. It was found that operating temperature had a slight or more marked influence on the product phase distribution as a consequence of the enhancement of biomass decomposition and also the greater prominence of cracking reactions especially at highest temperatures, yielding a greater gas production. It was found that increasing temperature led to decreasing biochar yields (from 29.4% to 20.4%) and increasing gas yields (from 34.4 to 44.4%), whereas the bio‐oil yield passed through a maximum 37.6% at 600°C. The biochars were characterized in terms of proximate and elemental analysis, thermal degradation profiles, high heating value and surface chemistry and morphology. In addition, the composition of gases was determined by gas chromatography. Apart from the changes induced by increasing temperature on the biochar properties such as greater pore volumes at 700°C (used in activated carbon manufacture), it was found that gas production was enhanced, and H2 and CH4 yields were the highest at 800°C. Finally, at 600°C biochar showed the highest heating value of 30.95 MJ kg−1, allowing its use briquette biofuels.

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