Physical, chemical, thermal and biological pre-treatment technologies in fast pyrolysis to maximize bio-oil quality: A critical review

Chavez, Brenda Alvarez; Godbout, Stéphane; Palacios-Ríos, Joahnn Hernando; Roux, Étienne Le; Raghavan, V.

doi:10.1016/j.biombioe.2019.105333

Cited by 51 publications

(17 citation statements)

References 138 publications

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“…Pyrolysis is based on the thermal decomposition of biomass by heat in the absence of oxygen, producing biochar (solid), bio-oil (liquid), and non-condensable gases [60]. Pyrolysis is a widely used technology to improve biodiesel quality [71]. Pyrolysis with catalytic reforming can effectively reduce the content of oxygen and increase the HC content in the bio-oil, respectively, and thus has great potential to be an alternative energy source [72].…”

Section: Pyrolysismentioning

confidence: 99%

A Comprehensive Review of the Properties, Performance, Combustion, and Emissions of the Diesel Engine Fueled with Different Generations of Biodiesel

Zhang

Zhong

et al. 2022

Processes

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Due to the increasing air pollution from diesel engines and the shortage of conventional fossil fuels, many experimental and numerical types of research have been carried out and published in the literature over the past few decades to find a new, sustainable, and alternative fuels. Biodiesel is an appropriate alternate solution for diesel engines because it is renewable, non-toxic, and eco-friendly. According to the European Academies Science Advisory Council, biodiesel evolution is broadly classified into four generations. This paper provides a comprehensive review of the production, properties, combustion, performance, and emission characteristics of diesel engines using different generations of biodiesel as an alternative fuel to replace fossil-based diesel and summarizes the primary feedstocks and properties of different generations of biodiesel compared with diesel. The general impression is that the use of different generations of biodiesel decreased 30% CO, 50% HC, and 70% smoke emissions compared with diesel. Engine performance is slightly decreased by an average of 3.13%, 89.56%, and 11.98% for higher density, viscosity, and cetane, respectively, while having a 7.96% lower heating value compared with diesel. A certain ratio of biodiesel as fuel instead of fossil diesel combined with advanced after-treatment technology is the main trend of future diesel engine development.

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Section: Pyrolysismentioning

confidence: 99%

A Comprehensive Review of the Properties, Performance, Combustion, and Emissions of the Diesel Engine Fueled with Different Generations of Biodiesel

Zhang

Zhong

et al. 2022

Processes

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“…The low pH of the bio-oil due to the presence of acids (pH < 3), [3][4][5] as well as its low thermal stability caused by the presence of, amongst others, sugars and aldehydes, both require an upgrading process. Technologies to improve the composition of bio-oils include catalytic hydrogenation, however these require high temperatures (> 200 °C) and pressures (up to 200 bar), [6,7] which negatively influence the economic viability of bio-based fuel production. [8] Considering the expected surplus in electricity due to increasing capacities in wind and solar installations, electrochemical upgrading of bio-oil operating at moderate reaction conditions may be an appealing alternative to catalytic upgrading.…”

Section: Introductionmentioning

confidence: 99%

Study on the Effect of Electrolyte pH during Kolbe Electrolysis of Acetic Acid on Pt Anodes

et al. 2022

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Kolbe already discovered in 1849 that electrochemical oxidative decarboxylation of carboxylic acids is feasible and leads to formation of alkanes and CO 2 , via alkyl radical intermediates. We now show for Pt electrodes that Kolbe electrolysis of acetic acid is favored in electrolytes with a pH similar to, or larger than the pKa of acetic acid, suppressing the formation of O 2 . However extended duration of electrolysis of acetate at basic pH results in loss of Faradaic efficiency to ethane, compensated by the formation of methanol. This change in selectivity is likely caused by the dissolution of CO 2 near the electrode-electrolyte interface, resulting in enlarged concentration of bicarbonate/ carbonate. On the positively polarized, and oxidized Pt surface, these anions seem to inhibit homocoupling of methyl radicals to ethane. These results demonstrate that reaction selectivity in acetic acid (acetate) oxidation using oxidized Pt electrodes is determined by the pH and the anionic composition of the electrolyte.

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“…Pretreatments for feedstock are also described and often result in bio-oils with more defined chemical distribution [129,[157][158][159], which could in turn reduce or even eliminate the need to refine or treat bio-oil after production.…”

Section: Applications Of Bio-oil As Chemical Source and Its Refinement Strategiesmentioning

confidence: 99%

Bio-Oil: The Next-Generation Source of Chemicals

et al. 2022

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Bio-oil, although rich in chemical species, is primarily used as fuel oil, due to its greater calorific power when compared to the biomass from which it is made. The incomplete understanding of how to explore its chemical potential as a source of value-added chemicals and, therefore, a supply of intermediary chemical species is due to the diverse composition of bio-oil. Being biomass-based, making it subject to composition changes, bio-oil is obtained via different processes, the two most common being fast pyrolysis and hydrothermal liquefaction. Different methods result in different bio-oil compositions even from the same original biomass. Understanding which biomass source and process results in a particular chemical makeup is of interest to those concerned with the refinement or direct application in chemical reactions of bio-oil. This paper presents a summary of published bio-oil production methods, origin biomass, and the resulting composition.

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Physical, chemical, thermal and biological pre-treatment technologies in fast pyrolysis to maximize bio-oil quality: A critical review

Cited by 51 publications

References 138 publications

A Comprehensive Review of the Properties, Performance, Combustion, and Emissions of the Diesel Engine Fueled with Different Generations of Biodiesel

A Comprehensive Review of the Properties, Performance, Combustion, and Emissions of the Diesel Engine Fueled with Different Generations of Biodiesel

Study on the Effect of Electrolyte pH during Kolbe Electrolysis of Acetic Acid on Pt Anodes

Bio-Oil: The Next-Generation Source of Chemicals

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