Evaluation of the porous structure development of chars from pyrolysis of rice straw: Effects of pyrolysis temperature and heating rate

Fu, Peng; Hu, Song; Xiang, Jun; Sun, Lushi; Wang, Jing

doi:10.1016/j.jaap.2012.08.005

Cited by 204 publications

(82 citation statements)

References 25 publications

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“…The char surface area increases with temperature and then slightly decreases when the temperature is higher than 1173 K (Fu et al, 2012b). There is a significant diminution in char reactivity with the increase of temperature (above 1073 K) as previously reported (Guerrero et al, 2005;Chen et al, 1997).…”

Section: Introductionsupporting

confidence: 83%

“…Besides, heating rate rising shortens tar vapors residence time in pores and reduces the condensation reaction leading to char reactivity increase (Kurosaki et al, 2003). However, char obtained at high heating rate has lower surface area compared to that at low heating rate when temperature was 900°C (Fu et al, 2012b). It is attributed to too high heating rate causing char interior higher temperature, a partial graphitization with formation of grapheme structure occurs, which does not contribute to the development of large surface area.…”

Section: Introductionmentioning

confidence: 99%

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The effect of temperature and heating rate on char properties obtained from solar pyrolysis of beech wood

Zeng

Minh

Gauthier

et al. 2015

Bioresource Technology

136

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, et al.. The effect of temperature and heating rate on char properties obtained from solar pyrolysis of beech wood. Bioresource Technology, Elsevier, 2015Elsevier, , 182, p.114-119. 10.1016Elsevier, /j.biortech.2015 The effect of temperature and heating rate on char properties obtained from solar pyrolysis of beech wood Char was obtained during solar pyrolysis at various temperatures and heating rates. ''Solar chars'' up to 2000°C and up to 450°C/s have been produced. Temperature and heating rate jointly affected char yield, structure and reactivity. Reactivity evolution with temperature and heating rate were related to structure. Keywords:Beech wood Solar pyrolysisChar structure ReactivityCombined effect a b s t r a c tChar samples were produced from pyrolysis in a lab-scale solar reactor. The pyrolysis of beech wood was carried out at temperatures ranging from 600 to 2000°C, with heating rates from 5 to 450°C/s. CHNS, scanning electron microscopy analysis, X-ray diffractometry, Brunauer-Emmett-Teller adsorption were employed to investigate the effect of temperature and heating rate on char composition and structure. The results indicated that char structure was more and more ordered with temperature increase and heating rate decrease (higher than 50°C/s). The surface area and pore volume firstly increased with temperature and reached maximum at 1200°C then reduced significantly at 2000°C. Besides, they firstly increased with heating rate and then decreased slightly at heating rate of 450°C/s when final temperature was no lower than 1200°C. Char reactivity measured by TGA analysis was found to correlate with the evolution of char surface area and pore volume with temperature and heating rate.

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Section: Introductionsupporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

The effect of temperature and heating rate on char properties obtained from solar pyrolysis of beech wood

Zeng

Minh

Gauthier

et al. 2015

Bioresource Technology

136

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“…Based on the observations, soil layers at 0-20 cm and 20-40 cm showed significantly lower Sd in MSD and RSD than HPD (Table 3). The low level soil water transfer in MSD limited upward flux and reduced salt movement to the upper layer of soil [46]. The Sd in the treatments of MSD and RSD were 37.04% and 38.90% in the 40-60 cm layer, and 31.86% and 33.21% in the 60-80 cm layer, respectively.…”

Section: Drainage Effectmentioning

confidence: 96%

Experimental Study on the Potential Use of Bundled Crop Straws as Subsurface Drainage Material in the Newly Reclaimed Coastal Land in Eastern China

Zhang

Feng

et al. 2018

Water

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Initial land reclamation of the saline soils often requires higher drainage intensity for quick leaching of salts from the soil profile; however, drainage pipes placed at closer spacing may result in higher cost. Seeking an inexpensive degradable organic subsurface drainage material may satisfy such needs of initial drainage, low investment and a heathy soil environment. Crop straws are porous organic materials that have certain strength and endurance. In this research, we explored the potential of using bundled maize stalks and rice straws as subsurface drainage material in place of plastic pipes. Through an experimental study in large lysimeters that were filled with saline coastal soil and planted with maize, we examined the drainage performance of the two organic materials by comparing with the conventional plastic drainage pipes; soil moisture distribution, soil salinity changed with depth, and the crop information were monitored in the lysimeters during the maize growing period. The results showed that maize stalk drainage and the rice straw drainage were significantly (p < 0.05) more efficient in removing salt and water from the crop root zone than the plastic drainage pipes; they excelled in drainage rate, leaching fraction, and lowering water table; and their efficient drainage processes lowered salt stress in the crop root zone and resulted in a slightly higher level of biomass. The experimental results suggest that crop straws may be used as a good organic substitute for the plastic drainage pipes in the initial stage land reclamation of the saline coastal soils.

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“…The pore volume values of the biochar samples obtained at 300, 500, and 700 °C were 0.93, 0.94, and 1.06 (cm 3 /g), respectively. It has been found that the pyrolysis temperature strongly affects pore development (Fu et al 2012). Although the surface area of the biochar was generally low, it can enhance nutrients and water retention in the soil-biochar environment.…”

Section: Biochar Surface Characteristicsmentioning

confidence: 99%

Co-production of Biochar, Bio-oil, and Syngas from Tamarix chinensis Biomass under Three Different Pyrolysis Temperatures

Irfan¹,

Lin²,

Yue³

et al. 2016

BioResources

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a Pyrolysis of Tamarix chinensis feedstock was performed at 300, 500, and 700 °C to investigate the characteristics of biochar, bio-oil, and syngas. Biochar yield decreased and syngas yield increased as the pyrolysis temperature increased. The biochar was characterized for elemental composition, surface, and adsorption properties. Values of pH, electrical conductivity (EC), ash, C, K, Na, and basic functional group contents all increased as the pyrolysis temperature increased, whereas P, Ca, Mg, and acidic functional groups decreased. The methylene blue adsorption capacity values were 1.78, 2.08, and 1.96 (mg g -1 ) and iodine 256.48, 255.51 and 76.42 (mg g -1 ) for the biochars produced at 300, 500, and 700 °C, respectively. The C and H contents in bio-oil ranged from 66 to 62% and 8 to 7%, while O changed from 25 to 29% when temperature was increased from 300 to 700 °C. The concentration of hydrocarbon gases, such as ethane, ethylene, propane, and acetylene, increased as the pyrolysis temperature increased. The sum of CO and CO2 occupied great percentage of the total gas, while the H2 concentration increased markedly to a maximum of 16% at 500 °C. Thus, T. chinensis is a potential feedstock for biochar and bioenergy production.

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Evaluation of the porous structure development of chars from pyrolysis of rice straw: Effects of pyrolysis temperature and heating rate

Cited by 204 publications

References 25 publications

The effect of temperature and heating rate on char properties obtained from solar pyrolysis of beech wood

The effect of temperature and heating rate on char properties obtained from solar pyrolysis of beech wood

Experimental Study on the Potential Use of Bundled Crop Straws as Subsurface Drainage Material in the Newly Reclaimed Coastal Land in Eastern China

Co-production of Biochar, Bio-oil, and Syngas from Tamarix chinensis Biomass under Three Different Pyrolysis Temperatures

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