Mechanism of decomposition of aromatics over charcoal and necessary condition for maintaining its activity

Hosokai, Sou; Kumabe, Kazuhiro; Ohshita, Mikio; Norinaga, Koyo; Li, Chun‐Zhu; Hayashi, Jun Ichiro

doi:10.1016/j.fuel.2008.04.019

Cited by 135 publications

(121 citation statements)

References 32 publications

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“…With the presence of coal char, the second way was probably more significant. This assumption was also supported by a previous study which reported that the aromatic compound was decomposed over the charcoal (wood char) by coking rather than the direct steam reforming 35 . In the case of char600, Gas production (mmol/ g biomass)…”

Section: Effect Of Coal Char On Rice Straw Steam Gasificationsupporting

confidence: 65%

“…Hosokai et al 35 also reported that the aromatic compounds, and especially naphthalene, were almost completely decomposed on charcoal.…”

Section: Effect Of Pyrolysis Temperature On Rice Straw Pyrolysismentioning

confidence: 98%

“…This indicates that the formation of coke/carbon is more dominant than the catalytic coke gasification on the surfaces of char800. Hosakai et al 35 reported that the catalytic activity of coal char could be maintained when the rate of coke gasification was higher than the rate of coke formation. The rate of coke steam gasification could be enhanced by the existence of AAEM remaining on char surfaces, in particular K 30,37 and Ca 20 .…”

Section: Effect Of Coal Char On Rice Straw Steam Gasificationmentioning

confidence: 99%

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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 Steam Gasificationsupporting

confidence: 65%

“…Hosokai et al 35 also reported that the aromatic compounds, and especially naphthalene, were almost completely decomposed on charcoal.…”

Section: Effect Of Pyrolysis Temperature On Rice Straw Pyrolysismentioning

confidence: 98%

Section: Effect Of Coal Char On Rice Straw Steam Gasificationmentioning

confidence: 99%

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Biomass derived tar decomposition over coal char bed

Krerkkaiwan¹,

Tsutsumi²,

Kuchonthara³

2013

ScienceAsia

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“…The decomposition of tar over char materials is reported to be due to different mechanisms including deposition, dehydrogenation in which soot is formed over the char surface, and gasification of soot (Hosokai et al, 2008;Hosokai et al, 2011). The coke formation and the gasification of the char have been found to occur simultaneously in which the gaseous products are formed due to these two processes (Hosokai et al, 2008). To further study the mechanism involved with the use of char for the tar decomposition, volatiles from the pyrolysis of biomass were reformed using charcoal with the presence of steam as a gasifying agent (Hosokai et al, 2011).…”

Section: Char Characterizationmentioning

confidence: 99%

“…Hosokai et al (2008) investigated the decomposition of benzene and naphthalene over charcoal and concluded that the decomposition of tar over char was mainly due to the coking rather than decomposition of aromatic compounds. In addition, the accumulation of coke on the surface of the chars may block the available active sites (metal species in the char) thus decreasing the char activity with time (Sueyasu et al, 2012).…”

Section: Char Characterizationmentioning

confidence: 99%

Thermal decomposition and gasification of biomass pyrolysis gases using a hot bed of waste derived pyrolysis char

Al-Rahbi

Onwudili

Williams

2016

Bioresource Technology

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Chars produced from the pyrolysis of different waste materials have been investigated in terms of their use as a catalyst for the catalytic cracking of biomass pyrolysis gases during the two-stage pyrolysis-gasification of biomass. The chars were produced from the pyrolysis of waste tyres, refused derived fuel and biomass in the form of date stones. The results showed that the hydrocarbon tar yields decreased significantly with all the char materials used in comparison to the non-char catalytic experiments. For example, at a cracking temperature of 800 °C, the total product hydrocarbon tar yield decreased by 70% with tyre char, 50% with RDF char and 9% with biomass date stones char compared to that without char. There was a consequent increase in total gas yield. Analysis of the tar composition showed that the content of phenolic compounds decreased and polycyclic aromatic hydrocarbons increased in the product tar at higher char temperatures.

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Gas Cleaning

Rhyner¹

2016

Synthetic Natural Gas From Coal, Dry Biomass, and Power‐to‐Gas Applications

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Mechanism of decomposition of aromatics over charcoal and necessary condition for maintaining its activity

Cited by 135 publications

References 32 publications

Biomass derived tar decomposition over coal char bed

Biomass derived tar decomposition over coal char bed

Thermal decomposition and gasification of biomass pyrolysis gases using a hot bed of waste derived pyrolysis char

Gas Cleaning

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