Understanding the stability of pyrolysis tars from biomass in a view point of free radicals

He, Wenjing; Liu, Qingya; Shi, Lei; Liu, Zhenyu; Ci, Donghui; Lievens, Caroline; Guo, Xing‐Min; Liu, Muxin

doi:10.1016/j.biortech.2014.01.063

Cited by 72 publications

(34 citation statements)

References 18 publications

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“…Besides these mechanisms mentioned above, Kim et al also [35] found that the low molecular weight components may participate in the polymerization with pyrolytic lignin, contributing to the increase of average molecular weight. Recently, few studies [36,37] confirmed that the existence of free radicals was responsible for the bio-oil instability during storage. Solid char residues, that are comprised mainly of oxides and salts of metals, contribute to changes in bio-oil properties [22].…”

Section: Aging and Instabilitymentioning

confidence: 95%

Review of recent developments to improve storage and transportation stability of bio-oil

Yang

Kumar

Huhnke

2015

Renewable and Sustainable Energy Reviews

159

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Section: Aging and Instabilitymentioning

confidence: 95%

Review of recent developments to improve storage and transportation stability of bio-oil

Yang

Kumar

Huhnke

2015

Renewable and Sustainable Energy Reviews

159

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“…The promoting effect cedar wood was possibly caused by the radicals and/or H donors from the biomass pyrolysis. He et al [31] reported that a large amount of radicals were contained in the biomass tar, and these radicals could enhance the gasification of coal when they contact with the coal. Other researchers considered that the relatively high hydrogen in biomass could play a synergistic role as H donors to coal during co-liquefaction [32] and copyrolysis [33,34].…”

Section: Cogasification Of Adaro Coal With Various Biomassmentioning

confidence: 99%

Effect of biomass type on the performance of cogasification of low rank coal with biomass at relatively low temperatures

Rizkiana

Guan

Widayatno

et al. 2014

Fuel

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Cogasification of low rank coal with three kinds of biomass, i.e., Japanese cedar, rice straw, and seaweed, at relatively low temperatures were performed in a fixed bed downdraft reactor. The effect of different biomass addition on the coal gasification performance was investigated by comparing the experimental char and gas yields with the calculated prediction data. Effect of the blending ratio was also investigated. It was found that the mixing of coal with biomass revealed a synergy effect. Biomass promoted the coal gasification rate, but the extent of promoting effect was depended on the characteristics of biomass themselves. Alkali and alkaline earth metal (AAEM) content played an important role in this synergy effect. Seaweed which contained high AAEM content promoted the coal gasification significantly. Structure of coal was also found to have great effect on the cogasification performance. The results indicated that cogasification of coal with biomass is feasible at relatively low temperatures.

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“…The effect of the temperature on the cracking of the volatiles has been demonstrated recently by us using tars obtained from pyrolysis of two kinds of biomass 16 and the four coals used in this work. 18 The tars were heated to various temperatures, and their radical concentration and THF-insoluble matter content were measured periodically.…”

Section: Energy and Fuelsmentioning

confidence: 95%

Analysis of Tars Produced in Pyrolysis of Four Coals under Various Conditions in a Viewpoint of Radicals

Liu

et al. 2015

Energy Fuels

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Many studies tried to correlate coal pyrolysis conditions with reactivity of tars produced, but few analyzed the radical concentration of tars. This work studies pyrolysis of four coals, with carbon contents in a range of 74−82 wt %, in a fixedbed tubular reactor at three heating rates and three N 2 -purging rates. The changes in the radical concentration of tars under various conditions, such as in solvents (hexane or tetrahydrofuran) or at high temperatures (300, 350, 400, and 450°C), are analyzed. The effect of pyrolysis conditions on the radical concentration of tars is ascribed to the temperature difference between the gas phase and the coal in the reactor, which results in further cracking of tars. The difference in the radical concentration in tars obtained from pyrolysis of different coals is elaborated in a viewpoint of the coal structure and pyrolysis mechanism.

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Understanding the stability of pyrolysis tars from biomass in a view point of free radicals

Cited by 72 publications

References 18 publications

Review of recent developments to improve storage and transportation stability of bio-oil

Review of recent developments to improve storage and transportation stability of bio-oil

Effect of biomass type on the performance of cogasification of low rank coal with biomass at relatively low temperatures

Analysis of Tars Produced in Pyrolysis of Four Coals under Various Conditions in a Viewpoint of Radicals

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