Reforming of Volatiles from the Biomass Pyrolysis over Charcoal in a Sequence of Coke Deposition and Steam Gasification of Coke

Hosokai, Sou; Norinaga, Koyo; Kimura, Tokuji; Nakano, Masaki; Li, Chun‐Zhu; Hayashi, Jun Ichiro

doi:10.1021/ef2003766

Cited by 80 publications

(67 citation statements)

References 30 publications

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“…One explanation lies in that char600 had a significantly larger total BET surface area (4.1-fold) and pore volume (2.85-fold) than char800 ( Table 2). It has previously been reported that tar reduction over char surfaces followed two steps of tar deposition to form secondary char and/or coke and steam gasification of coke 4,22 . Although no external steam was introduced, the steam gasification presumably could have taken place from the pyrolytic steam that was generated from the biomass pyrolysis 23,24 .…”

Section: Effect Of Coal Char On Rice Straw Pyrolysismentioning

confidence: 99%

Biomass derived tar decomposition over coal char bed

Krerkkaiwan¹,

Tsutsumi²,

Kuchonthara³

2013

ScienceAsia

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The effect of coal char on the decomposition of rice straw derived tar was investigated in a two-stage fixed bed reactor. The reactor was divided into a pyrolysis zone (upper part) and a volatile-char contacting zone (lower part). Rice straw was pyrolysed at different temperatures in the upper part. Coal char, prepared by the pyrolysis of Indonesian coal at either 600°C (char600) or 800°C (char800), was located in the lower part. Volatiles from the rice straw (upper part) were produced and then came in contact with the coal char at the lower part under the N 2 (pyrolysis) or steam/N 2 (steam reforming) gas flow. Under pyrolysis, both char600 and char800 exhibited a catalytic effect on the thermal tar decomposition. The coal chars also played a significant catalytic activity on the decomposition of the heavy aromatic hydrocarbons that were generated at a high pyrolysis temperature. In the presence of steam, char600 also exhibited a catalytic role in tar steam reforming, while char800 did not reveal any such significant catalytic activity because of the predominant coke/carbon formation.

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Section: Effect Of Coal Char On Rice Straw Pyrolysismentioning

confidence: 99%

Biomass derived tar decomposition over coal char bed

Krerkkaiwan¹,

Tsutsumi²,

Kuchonthara³

2013

ScienceAsia

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“…It results from thermal decomposition of organic compounds onto the catalyst, which results in catalyst deactivation. High and suitable steam to carbon ratio helps decreasing tar and coke formation (Hosokai et al, 2011;Park et al, 2010;Song et al, 2015;Umeki et al, 2012;Wang et al, 2014). However, the heat load increases, since more steam has to be supplied (Moghadam et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

An integrated process for hydrogen-rich gas production from cotton stalks: The simultaneous gasification of pyrolysis gases and char in an entrained flow bed reactor

Chen

Zhang

Chen

et al. 2015

Bioresource Technology

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“…On the other hand, the removal of AAEM species, in other words, the major catalytic species, will considerably change the characteristics of gasification of char 26−29 and reforming of volatiles over the char. 30,31 The gasification of char from the pyrolysis of biomass is contributed by non-catalytic gasification and AAEM-catalyzed gasification. 29 These two modes of gasification differ clearly from each other regarding the rate of reaction and its variation with the progress of char conversion.…”

Section: Introductionmentioning

confidence: 99%

Kinetics and Mechanism of Steam Gasification of Char from Hydrothermally Treated Woody Biomass

et al. 2014

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Hydrothermal treatment (HTT) is a promising way of upgrading biomass as a solid fuel and precursor of carbon materials by eliminating or transforming carbohydrates and also leaching alkali and alkaline earth metallic (AAEM) species. This study investigated steam gasification of a woody biomass that had been upgraded by HTT at 250°C. HTT removed 87−97% of AAEM species from the biomass. The char from the pyrolysis of the treated biomass underwent gasification, obeying first-order kinetics with respect to the mass of char over the entire range of conversion. This kinetics arose from non-catalytic gasification. AAEM species remaining in the char had no catalytic activity. The specific surface area of char increased monotonically with its conversion from 500 to well above 2000 m 2 /g. The non-catalytic nature of the gasification was responsible for such a significant surface area development. The surface area was, however, not a factor influencing the rate of gasification. The presence of the inherent AAEM catalyst and that of the extraneous potassium catalyst altered the kinetics of gasification to zeroth order while suppressing the surface-area development not only creating but also consuming micropores. The surface area was not a kinetic factor for the catalytic gasification.

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Reforming of Volatiles from the Biomass Pyrolysis over Charcoal in a Sequence of Coke Deposition and Steam Gasification of Coke

Cited by 80 publications

References 30 publications

Biomass derived tar decomposition over coal char bed

Biomass derived tar decomposition over coal char bed

An integrated process for hydrogen-rich gas production from cotton stalks: The simultaneous gasification of pyrolysis gases and char in an entrained flow bed reactor

Kinetics and Mechanism of Steam Gasification of Char from Hydrothermally Treated Woody Biomass

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