Carbonization of bamboo and consecutive low temperature air activation

Yamashita, Noriyuki; Machida, Motoi

doi:10.1007/s00226-010-0372-0

Cited by 15 publications

(5 citation statements)

References 19 publications

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“…The specific surface area of the initial bamboo char is more than 300 m 2 /g, while other chars dropped to around 200 m 2 /g. Other studies also observed a similar decline of char porosity. , Biomass is generally a good sorbent of liquid bio-oil for its macroporous structure that provides space for its condensation and retention. It was thus expected that the biomass in the second stage would capture a certain amount of bio-oil within the macropores or dense matrix if in contact with vaporous or liquid bio-oil from the pyrolysis of first stage. , Meanwhile, bio-oil is a mixture of aldehydes, ketones, furans, monosugars, sugar oligomers, pyrolytic lignin, phenolics, and others, ,− which are exceedingly reactive toward polymerization, especially under acidic conditions. , Therefore, the bio-oil can potentially fill the pores of parent biomass on the second layer by co-carbonizing the bio-oil and biomass together, which led to the decrease of char porosity.…”

Section: Resultsmentioning

confidence: 59%

“…Other studies also observed a similar decline of char porosity. 29,30 Biomass is generally a good sorbent of liquid bio-oil for its macroporous structure that provides space for its condensation and retention. It was thus expected that the biomass in the second stage would capture a certain amount of bio-oil within the macropores or dense matrix if in contact with vaporous or liquid bio-oil from the pyrolysis of first stage.…”

Section: Methodsmentioning

confidence: 99%

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Investigation of Char Yield and Its Physicochemical Properties with Recycling of Heavy Oil from Biomass Pyrolysis

Shi

Zhang

et al. 2021

Energy Fuels

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The study aims to realize the recycling of the heavier portion of bio-oil produced in pyrolysis to achieve a higher char yield in a two-stage fixed bed. Simultaneously, the influence of condensation temperature in the second-stage reactor on the obtained char yield was probed as well. For further investigation on the physicochemical properties of char samples, ultimate analysis, N 2 adsorption−desorption measurements, Raman spectroscopy, and Fourier-transform infrared spectroscopy analysis were conducted. In addition, the reactivity of char samples in air was determined using a thermogravimetric analyzer. The results suggested that the char samples produced by the recycling of heavy oil resulted in a relatively high yield. Simultaneously, different condensation temperatures of the second layer during pyrolysis had a significant impact on the experimental results: as the temperature increased, the char yield and the O/C molar ratio decreased, whereas the value of I G /I ALL increased. Finally, it was found that the increase of condensation temperature in the second layer led to the decline of char reactivity. The dimensionless index (DI) was used to show the physicochemical properties of char, and a linear relationship between the oxidation activity index and DI was achieved, which could be used to predict the char reactivity based on the physicochemical properties for industrial applications.

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Section: Resultsmentioning

confidence: 59%

Section: Methodsmentioning

confidence: 99%

Investigation of Char Yield and Its Physicochemical Properties with Recycling of Heavy Oil from Biomass Pyrolysis

Shi

Zhang

et al. 2021

Energy Fuels

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“…However, pyrolysis is typically associated with significant energy consumption. To address this issue, hydrothermal carbonization, also known as wet torrefaction, is advocated as an alternative method [92][93][94]. Compared with untreated or torrefied biomass, the solid hydrochar produced through hydrothermal carbonization shows decreased O/C ratio, increased HHV, and improved hydrophobicity [95].…”

Section: Torrefaction and Carbonization For Combustionmentioning

confidence: 99%

Modification and Application of Bamboo-Based Materials: A Review—Part II: Application of Bamboo-Based Materials

Lou,

Zheng,

Yan

et al. 2023

Forests

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Bamboo, with its inherently porous composition and exceptional renewability, stands as a symbolic embodiment of sustainability. The imperative to fortify the utilization of bamboo-based materials becomes paramount for future developments. These materials not only find direct applications in the construction and furniture sectors but also exhibit versatility in burgeoning domains such as adsorption materials and electrode components, thereby expanding their consequential influence. This comprehensive review meticulously delves into both their explicit applications and the nuanced panorama of derived uses, thereby illuminating the multifaceted nature of bamboo-based materials. Beyond their current roles, these materials hold promise for addressing environmental challenges and serving as eco-friendly alternatives across diverse industries. Lastly, we provide some insights into the future prospects of bamboo-based materials, which are poised to lead the way in further development. In conclusion, bamboo-based materials hold immense potential across diverse domains and are set to play an increasingly pivotal role in sustainable development.

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“…In the case of wood materials, a point appears in the power characteristic of the emitter at which the rate of wood darkening suddenly decreases with linear power increase. This is because carbonization is affected by heating rate as well as final temperature (Yamashita and Machida 2011). Here is the beginning of the third and last interval of wood shade change by the action of a laser beam.…”

Section: Shade Dependence On Beam Powermentioning

confidence: 99%

Laser beam calibration for wood surface colour treatment

Jurek

Wagnerova

2021

Eur. J. Wood Prod.

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Laser engraving of photographs on wood surfaces is a challenging task. To optimize the outcome and production quality it is necessary to control every aspect of the laser engraving process. Most of the production machines and technologies overall are mainly focused on laser power control. However, with other systems and deeper knowledge of the wood characteristics it is possible to achieve even better quality. This paper deals with enlarging the number of achievable shades of burned wood and its optimization. A calibration system was developed to control colour shades of engraved wood with a combination of laser power and optic focus. With this approach it is possible to widen achievable palette of engraved shades by continuous control of chemical processes of laser and wood interaction. The production is divided into wood burning and wood carbonization by variation of laser beam focus.

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Carbonization of bamboo and consecutive low temperature air activation

Cited by 15 publications

References 19 publications

Investigation of Char Yield and Its Physicochemical Properties with Recycling of Heavy Oil from Biomass Pyrolysis

Investigation of Char Yield and Its Physicochemical Properties with Recycling of Heavy Oil from Biomass Pyrolysis

Modification and Application of Bamboo-Based Materials: A Review—Part II: Application of Bamboo-Based Materials

Laser beam calibration for wood surface colour treatment

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