Slow pyrolysis studies for utilization of impregnated waste timber materials

Zhurinsh, Aivars; Zandersons, Jānis; Dobele, Gaļina

doi:10.1016/j.jaap.2004.11.009

Cited by 23 publications

(19 citation statements)

References 6 publications

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“…In the spouted bed reactor, biomass is fed with an auger feeder at the bottom and enters the reactor via entrainment with 4-10 L/min N 2 flow. The reactor operates at temperatures up to 1000°C, 600°C in the experiments discussed 55 here. The products pass through six impingers, with three of them filled with 5 ml methanol each, to collect the liquid products.…”

Section: Experimental Section Experimental Setupmentioning

confidence: 99%

“…They defined coke as the carbonaceous material deposited on the catalyst. They claimed that the combustion of coke in the meso-and macro-pores of the catalyst shows a temperature programmed oxidation (TPO) peak at lower temperatures, compared with the coke located inside the zeolite 55 crystal channels due to differences in composition. They also observed coke outside the zeolite crystals with heterogeneous sizes between 10 and 50 nm, using transmission electron microscopy (TEM).…”

Section: Introductionmentioning

confidence: 99%

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Characteristics and origin of char and coke from fast and slow, catalytic and thermal pyrolysis of biomass and relevant model compounds

2013

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Char and coke from biomass catalytic pyrolysis have different origins. They cannot be lumped as one since they occupy different locations on the catalyst surface and, thus, contribute differently to catalyst deactivation. In this study, catalyst (ZSM-5) deactivation in the perspective of comparison of char and coke from pyrolysis of different biomass types is investigated. Pine sawdust, glucose, and cellulose are used as feedstocks in the pyrolysis experiments. Biomass char and coke samples produced via slow and fast, thermal and catalytic pyrolysis are characterized with respect to their overall content, oxidation reactivity, catalyst surface area, pore size distribution changes, bonding groups and their effect on catalyst performance. In particular, it is shown that char forms as an external layer on the catalyst surface and in its macropores, whereas coke forms inside the zeolite micropores via hydrogen transfer and addition reactions. The catalyst effect on glucose and pine slow catalytic pyrolysis is minor compared with that on cellulose slow catalytic pyrolysis, due to macropore blocking by char formation. In fast catalytic pyrolysis, catalyst deactivation is mainly attributed to micropore blocking by coke formation. Char and coke are shown to coexist on the catalyst surface after fast catalytic experiments, with the char content after glucose fast catalytic pyrolysis being 30 wt% of the total solid residue. The origins of char and coke in the cellulose, hemicellulose and lignin components of pine are identified and mechanisms for their formation are proposed.

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Section: Experimental Section Experimental Setupmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Characteristics and origin of char and coke from fast and slow, catalytic and thermal pyrolysis of biomass and relevant model compounds

2013

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“…The pyrolysis of biomass has been extensively studied in literatures for the reaction kinetics and the effect of process parameters [4][5][6][7][8][9][10][11][12]. Pyrolysis thermally decomposes high molecular weight compounds into smaller fragments.…”

Section: Introductionmentioning

confidence: 99%

Characterisation of slow pyrolysis products from segregated wastes for energy production

Phan

Ryu

Sharifi

et al. 2008

Journal of Analytical and Applied Pyrolysis

109

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“…The cleavage of these functional groups produces low molecular weight products, while the complete rearrangement of the backbone at higher temperatures leads to char formation and to the release of volatile products. The cleavage of the aryl-ether linkages results in the formation of highly reactive and unstable free radicals that may further react through rearrangement, electron abstraction or radical-radical interactions, to form more stable products [29,[32][33][34][35][36][37][38][39][40][41]. In general, the products from thermal decomposition of lignin can be divided into gaseous hydrocarbons together with carbon monoxide and carbon dioxide, volatile liquids and phenolic compounds.…”

Section: Fig 2 Tg Analysis Of Ligninmentioning

confidence: 99%

Utilization of Sub and Supercritical Water Reactions in Resource Recovery of Biomass Wastes

Wahyudiono¹,

Machmudah²,

Goto³

2013

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Abstract.Recently, the utilization of sub and supercritical water has been proposed to recover waste substances from biomass. This is important not only for prevention of environmental issues, but also for rational utilization of natural resources. Sub and supercritical water treatment is one of the most effective methods for this, because water at high temperature and high pressure behaves as a reaction medium with remarkable properties. This sub and supercritical water treatment process can promote various reactions such as oxidation, hydrolysis, and dehydration. Therefore, sub and supercritical water can be used for the conversion of organic wastes to useful chemical compounds, as well as for oxidizing hazardous waste into CO2 or harmless compounds. This paper presents the concepts of sub and supercritical water and their application in organic waste recycling at temperatures of 423 -673 K for substances such as lignin and its derived compounds.

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Slow pyrolysis studies for utilization of impregnated waste timber materials

Cited by 23 publications

References 6 publications

Characteristics and origin of char and coke from fast and slow, catalytic and thermal pyrolysis of biomass and relevant model compounds

Characteristics and origin of char and coke from fast and slow, catalytic and thermal pyrolysis of biomass and relevant model compounds

Characterisation of slow pyrolysis products from segregated wastes for energy production

Utilization of Sub and Supercritical Water Reactions in Resource Recovery of Biomass Wastes

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