Steam gasification of biochar derived from elephant grass pyrolysis in a screw reactor

Ferreira, Suelem Daiane; Lazzarotto, Ivan Pedro; Junges, Janaína; Manera, Christian; Godinho, Marcelo; Osório, Eduardo

doi:10.1016/j.enconman.2017.10.006

Cited by 57 publications

(26 citation statements)

References 58 publications

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“…The product gas yield of 4.0 m N 3 kg char −1 was high in comparison with those reported in the literature. Ferreira et al reported a gas yield of 2.26 m N 3 kg char −1 for steam gasification of elephant grass biochar at 900 °C, in which biochar was obtained from pyrolysis of elephant grass at 500 °C with a holding time of 33 min in a screw reactor. The conversion was 0.68 at 30 min, whereas Ferreira et al reported a conversion greater than 0.9 at 30 min.…”

Section: Resultsmentioning

confidence: 90%

“…As expected, there was a significant decrease in the volatile matter content (from 81.2 to 17.5 %) and an increase of the fixed carbon (from 9.8 to 60.1 %) in the biochar. A high ash content in the biochar was observed, as reported elsewhere . The biochar showed an appreciable surface area (27.8 m 2 g −1 ), which was predominantly formed by mesopores.…”

Section: Resultsmentioning

confidence: 99%

“…Afterwards, it decreases monotonically up to 30 min, and finally the reaction rate remains relatively constant, and can be considered insignificant between 30 and 60 min. Ferreira et al reported a similar behavior of the reaction rate with gasification reaction progress for the elephant grass char obtained by pyrolysis at 500 °C, with its maximum (ca. 0.055 min −1 ) occurring also at the beginning of the reaction ( t < 3 min).…”

Section: Resultsmentioning

confidence: 99%

“…Ferreira et al reported a gas yield of 2.26 m N 3 kg char −1 for steam gasification of elephant grass biochar at 900 °C, in which biochar was obtained from pyrolysis of elephant grass at 500 °C with a holding time of 33 min in a screw reactor. The conversion was 0.68 at 30 min, whereas Ferreira et al reported a conversion greater than 0.9 at 30 min. In addition, biochar produced by Ferreira et al had a fixed carbon content of 48.2 % (dry basis), while the fixed carbon content of biochar obtained by the pyrolysis of elephant grass at 900 °C with a holding time of 180 min was 60.1 % (dry basis).…”

Section: Resultsmentioning

confidence: 99%

“…The maximum reaction rate of hydrogen was observed at 900 °C (ca. 3.5 mmol H 2 per minute and gram biochar) and between 0 and 3 min .…”

Section: Introductionmentioning

confidence: 99%

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Investigation of the Structure of the Biochar Obtained by Slow Pyrolysis of Elephant Grass during Its Steam Gasification

et al. 2019

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A detailed evaluation of the structure of biochar from slow pyrolysis of elephant grass during its steam gasification was performed. The effects of surface area and inherent alkali and alkaline earth metal (AAEM) species on the reactivity of the biochar were investigated. Drastic changes in biochar structure occurred throughout the reaction, especially for low degrees of conversion. The BET surface area of the biochar increased significantly until the conversion reached 0.49, and there was a steep decrease at high degrees of conversion. The biochar showed a high AAEM concentration. The aromaticity of the biochar suggested an ordered carbon structure that can lower the reaction rate. The high syngas yield makes the process attractive for generation of renewable energy.

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Section: Resultsmentioning

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

“…The maximum reaction rate of hydrogen was observed at 900 °C (ca. 3.5 mmol H 2 per minute and gram biochar) and between 0 and 3 min .…”

Section: Introductionmentioning

confidence: 99%

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Investigation of the Structure of the Biochar Obtained by Slow Pyrolysis of Elephant Grass during Its Steam Gasification

et al. 2019

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Steam Gasification of Biochar Derived from the Pyrolysis of Chrome‐Tanned Leather Shavings

et al. 2019

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Chromium‐treated leather shavings are generated in large quantities by the leather industry. The biochar gasification from leather shavings leads to two main products, a hydrogen‐rich syngas and a chromium‐rich ash. Syngas has found different applications such as electricity generation and chemical manufacturing. The remaining ash potentially can be utilized, e.g., in stainless‐steel production processes. The thermochemical conversion of biochar from chromium‐tanned leather shavings via steam gasification was investigated. The cumulative gas yield and cumulative H2 yield were determined as well as the total chromium as Cr2O3 in the remaining ash.

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Energetic characterization and flash pyrolysis of different elephant grass cultivars (Pennisetum purpureum Schum.)

et al. 2021

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Limited fossil fuel reserves combined with greenhouse gas intensification due to CO2 emissions has encouraged research in renewable fuels. In this work, a flash pyrolysis study of elephant grass cultivars—Pennisetum purpureum Schum cultivar Mott (MEG), P. purpureum Schum cultivar Roxo (REG), and P. purpureum Schum cultivar Capiaçu (CEG)—was carried out. The biomasses were evaluated in terms of energy characterization by proximate and ultimate analysis, thermogravimetric analyses (TG/DTG), X‐ray diffraction (XRD), Fourier transform infrared (FTIR), and analytical pyrolysis (Py‐GC/MS) at 600°C. The characterization results showed that these biomasses have potential for energy applications and to produce valuable chemicals. The pyrolysis products produced were mainly oxygenated, including short‐chain organic acids (C1‐C4), furans, esters, aldehydes, ketone, and phenols. Although the obtained results were similar for the three biomasses with small variations in the yields of the pyrolysis products, the study reveals an important difference in terms of energy density. CEG was proven as the most promising elephant grass cultivar to be applied for fast pyrolysis to obtain bio‐oil due to its higher dry matter production (2115 t km−2), power generated (9529 MWh km−2), HHV (16.22 MJ kg−1), lower ash content (6.75%), higher volatile content (74.84%), and higher carbon content (42.57%).

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Steam gasification of biochar derived from elephant grass pyrolysis in a screw reactor

Cited by 57 publications

References 58 publications

Investigation of the Structure of the Biochar Obtained by Slow Pyrolysis of Elephant Grass during Its Steam Gasification

Investigation of the Structure of the Biochar Obtained by Slow Pyrolysis of Elephant Grass during Its Steam Gasification

Steam Gasification of Biochar Derived from the Pyrolysis of Chrome‐Tanned Leather Shavings

Energetic characterization and flash pyrolysis of different elephant grass cultivars (Pennisetum purpureum Schum.)

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