The conversion of wood lignin to char materials in a fluidized bed of AlCuCr oxide catalysts

Кузнецов, Б. Н.; Щипко, М. Л.

doi:10.1016/0960-8524(94)00140-v

Cited by 26 publications

(5 citation statements)

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“…Anyhow, fluidized-bed reactor has some flaws for the pyrolysis process of lignin. The highest temperature was noticed nearly in the upper border of the bed [32] because of the continuous reaction of pyrolysis vapors in the part, indicating that undesirable side reaction happens out of the fluidized bed and in completed pyrolysis reaction in the cell of the fluidized bed, which could produce more of undesirable by-products. So, it was noticed that the most desired products were commonly gotten at the half length of the reactor [33].…”

Section: Exterior Heating Pyrolysis Reactorsmentioning

confidence: 99%

A Study on Pyrolysis of Lignin over Mesoporous Materials

Rabie¹,

Abouelela²

2020

Recent Advances in Pyrolysis

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The aromatics have widespread uses across the chemical industries. Where, the monocyclic aromatics (e.g. BTX) and phenolics compounds are important basic raw materials for several industrial petrochemical processes such as synthetic polymers, detergents, biocides, resins, explosives, etc. Traditional production of these valuable chemicals has been dependent on fossil resources for more than half a century. So, it requires strategies for alternative chemical production from renewable sources especially from nonedible biomass. This chapter presents a review of the recent literature on the fast pyrolysis process for the production of aromatic hydrocarbons using mesoporous catalysts. We focus on the factors that can enhance the yield of aromatics and the lifetime of the catalyst used. Background information on catalyst deactivation during the pyrolysis process was described. The role of mesoporous catalyst's acidity and textural and topological properties of lignin to aromatics conversion was also discussed in detail.

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Section: Exterior Heating Pyrolysis Reactorsmentioning

confidence: 99%

A Study on Pyrolysis of Lignin over Mesoporous Materials

Rabie¹,

Abouelela²

2020

Recent Advances in Pyrolysis

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“…On the contrary, slow pyrolysis have been applied to hydrolytic lignin from biochemical plants as a pretreatment for further physical activation. Catalytic slow pyrolysis of lignin was carried out in an air/steam-fluidized bed reactor and subsequently activated carbons were produced by steam activation [16]. The maximum surface area (769 m 2 g −1 ) was obtained with a pyrolysis temperature of 780 • C and by activating at 780 • C for 30 min and with a steam/char ratio of 2.44.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Chemically and Physically Activated Carbons from Lignocellulosic Ethanol Lignin-Rich Stream via Hydrothermal Carbonization and Slow Pyrolysis Pretreatment

Miliotti¹,

Rosi

Bettucci³

et al. 2020

Energies

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The aim of the present work is to investigate the possibility of producing activated carbons from the residual lignin stream of lignocellulosic ethanol biorefineries, as this represents an optimal opportunity to exploit a residual and renewable material in the perspective of sustainable bioeconomy, increasing biorefinery incomes by producing value-added bioproducts in conjunction with biofuels. Activated carbons (ACs) were produced via chemical (KOH) and physical (CO2) activation. Char samples were obtained by slow pyrolysis (SP) and hydrothermal carbonization (HTC). Several HTC experiments were carried out by varying residence time (0.5–3 h) and reaction temperature (200–270 °C), in order to evaluate their influence on the product yield and on the morphological characteristics of the hydrochar (specific surface area, total pore volume and pore size distribution). ACs from hydrochars were compared with those obtained from pyrochar (via physical activation) and from the raw lignin-rich stream (via chemical activation). In both cases, by increasing the HTC temperature, the specific surface of the resulting activated carbons decreased from 630 to 77 m2 g−1 for physical activation and from 675 to 81 m2 g−1 for chemical activation, indicating that an increase in the severity of the hydrothermal pretreatment is deleterious for the activated carbons quality. In addition, the HTC aqueous samples were analyzed, with GC-MS and GC-FID. The results suggest that at low temperatures the reaction mechanisms are dominated by hydrolysis, instead when the temperature is increased to 270 °C, a more complex network of reactions takes place among which decarboxylation.

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“…On the other hand, lignin contains a substantial amount of carbon and it is suitable for producing activated carbon.Lignin is a very attractive alternative to synthetic sourced activated carbon materials because it is cost effective, sustainable and renewable. Chemical and physical activation methods have been used to synthesize activated carbon materials from lignin[61][62][63][64][65][66][67][68][69][70][71].…”

mentioning

confidence: 99%

Lignin Carbon Fibres: Properties, Applications and Economic Efficiency

Ismail

Akpan

2019

Sustainable Lignin for Carbon Fibers: Principles, Techniques, and Applications

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The conversion of wood lignin to char materials in a fluidized bed of AlCuCr oxide catalysts

Cited by 26 publications

References 1 publication

A Study on Pyrolysis of Lignin over Mesoporous Materials

A Study on Pyrolysis of Lignin over Mesoporous Materials

Characterization of Chemically and Physically Activated Carbons from Lignocellulosic Ethanol Lignin-Rich Stream via Hydrothermal Carbonization and Slow Pyrolysis Pretreatment

Lignin Carbon Fibres: Properties, Applications and Economic Efficiency

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