The influence of pilot-scale pyro-gasification and activation conditions on porosity development in activated biochars

Braghiroli, Flavia Lega; Bouafif, Hassine; Hamza, Nesrine; Bouslimi, Besma; Neculita, Carmen Mihaela; Koubaa, Ahmed

doi:10.1016/j.biombioe.2018.08.016

Cited by 26 publications

(22 citation statements)

References 70 publications

(81 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The battery electrode material grade will substantially contain more value and so thus required energy to treat the waste at high temperatures (>1000°C). The application requiring posttreatment in terms of activation 58 and magnetic biochar composites 59 production will subsequently raise the price of the char. The effect of O/C, N/C, and chlorine content on the energy recovery was analysed by regression analysis (Figure 9).…”

Section: Economic Analysismentioning

confidence: 99%

Carbon conversion and stabilisation of date palm and high rate algal pond (microalgae) biomass through slow pyrolysis

et al. 2019

View full text Add to dashboard Cite

Summary The processing of waste through pyrolysis technology is gaining momentum worldwide and is considered to be a green technology to reduce CO2 emissions. This study is devoted to analysing the lignocellulosic biomass (date palm) and wastewater‐derived microalgae and the carbon‐rich char produced between temperature range (400°C‐600°C) from these biomass types. The properties of microalgae char showed that significant variation with date palm char exhibited high heating values (24‐28 MJ/kg), low ash content (11%‐16%), and high energy yield (48%‐42%). Algal biomass char showed considerably high nitrogen content (6%‐7%) as compared with date palm char (<1%), lower stability, and more significant influence on the price with respect to treatment temperature. Quaternary, pyrrolic, and pyridinic nitrogen species were found on the surface of the microalgae char, whereas no nitrogen species detected on date palm char due to low nitrogen content. The activation energy was also noted to be high for algal char during pyrolysis and combustion process. It can be concluded that date palm char is suitable for energy applications, whereas, algal char can be used for soil amendment, wastewater treatment, and applications requiring nitrogen‐doped char.

show abstract

Section: Economic Analysismentioning

confidence: 99%

Carbon conversion and stabilisation of date palm and high rate algal pond (microalgae) biomass through slow pyrolysis

et al. 2019

View full text Add to dashboard Cite

show abstract

“…The regression analysis indicated that pyrolysis temperature had no significant impact on the final surface area or pore volume. Similarly, the influence of torrefaction/fast pyrolysis of white birch and black spruce on the porosity development of CO2-activated biochars was statistically exanimated by Braghiroli et al [174]. The pyro-gasification temperature was varied from 588 to 727 K and the activation temperature varied from 973 to 1173 K. It was concluded that the first step pyro-gasification had less impact on the porosity of activated biochars while the activation temperature was the major variable to optimize their surface area.…”

Section: Effects Of Pyro-gasification Conditions On the Porosity Of Amentioning

confidence: 96%

“…The current challenge in activated biochar production is that only laboratory-scale furnaces have been tested to date. Braghiroli et al [174] produced highly porous physically and chemically activated biochars made from wood residues through a torrefaction/fast pyrolysis industrial furnace (Airex Energy, Canada, 250 kg h -1 ) and a prototype activation furnace (slow pyrolysis in a shaftless screw conveyor reactor, 1 kg h -1 ). One promising direction would be to combine both furnaces having flexible and scalable activation processes with high temperatures (up to 1173 K) and long residence times (1 h minimum) at various heating rates.…”

Section: Reactor Designmentioning

confidence: 99%

Influence of Pyro-Gasification and Activation Conditions on the Porosity of Activated Biochars: A Literature Review

Braghiroli

Bouafif

Neculita

et al. 2019

Waste Biomass Valor

Self Cite

View full text Add to dashboard Cite

Biochar is a carbon-rich organic material that has advantageous physicochemical properties for applications in multidisciplinary areas of science and engineering, including soil amendment, carbon sequestration, bioenergy production, and site rehabilitation. However, the typically low porosity and surface area of biochars (from 0.1 to 500 m 2 g-1) limits the suitability for other applications, such as catalysis, electrochemistry, energy storage, and contaminant sorption in drinking water and wastewater. Given the high global demand for activated carbon products, scientists and industrialists are exploring the potential of biochar-derived biomass as precursors for activated carbons. This review presents and discusses the available studies on activated biochars produced from various precursor feedstocks and under different operating conditions in a two-step procedure: pyro-gasification (torrefaction, slow to flash pyrolysis, and gasification) followed by activation (physical, chemical or physicochemical). Findings from several case studies demonstrate that lignocellulosic residues provide attractive precursors, and that chemical activation of the derived biochars at high temperature and long residence time produces highly porous end materials. Indeed, the porosity of activated biochars varies greatly (from 200 to 2500 m 2 g-1), depending on the pyro-gasification operating conditions and the feedstock (different feedstocks have distinct morphological and chemical structures). The results also indicate that the development of highly porous activated biochars for diverse purposes (e.g., electrodes for electrochemical energy storage devices, catalyst supports and adsorbents for water treatment) would benefit both the bioeconomy and the environment. Notably, it would leverage the potential of added-value biomass as an economical, non-fossil, readily available, and renewable energy source.

show abstract

“…The torrefaction/fast pyrolysis plant converted wood particles into torrefied wood (315 • C) and biochar (400 and 455 • C) in an oxygen-free environment. More details on biochar preparation have been described elsewhere [22].…”

Section: Materials Sampling and Biochar Preparationmentioning

confidence: 99%

Effect of the Pyro-Gasification Temperature of Wood on the Physical and Mechanical Properties of Biochar-Polymer Biocomposites

et al. 2020

Self Cite

View full text Add to dashboard Cite

The physical and mechanical properties of wood (WPC) and biochar polymer composites (BPC) obtained at different pyro-gasification temperatures and different fiber proportions were investigated. Composite pellets made from wood chips or biochar and thermoplastic polymers (polypropylene or high-density polyethylene) were obtained by twin-screw extrusion, and test specimens were prepared by injection molding. Results showed that BPCs were more dimensionally stable compared to WPCs, but their mechanical properties decreased with increasing pyro-gasification temperatures due to the poor adhesion between the polymer and biochar. Indeed, FTIR investigations revealed the decrease or absence of hydroxyl groups on biochar, which prevents the coupling agent from reacting with the biochar surface. The change in the biochar chemical structure led to an improvement in the dimensional stability and hydrophobicity of the biocomposites. Despite the increased dimensional stability of BPCs compared to WPCs, BPCs still adsorb water. This was explained by the surface roughness and by the biochar agglomerations present in the composite. In conclusion, the thermochemical conversion of black spruce wood chips into biochar makes it brittle but more hydrophobic, thereby reducing the wettability of the BPCs.

show abstract

The influence of pilot-scale pyro-gasification and activation conditions on porosity development in activated biochars

Cited by 26 publications

References 70 publications

Carbon conversion and stabilisation of date palm and high rate algal pond (microalgae) biomass through slow pyrolysis

Carbon conversion and stabilisation of date palm and high rate algal pond (microalgae) biomass through slow pyrolysis

Influence of Pyro-Gasification and Activation Conditions on the Porosity of Activated Biochars: A Literature Review

Effect of the Pyro-Gasification Temperature of Wood on the Physical and Mechanical Properties of Biochar-Polymer Biocomposites

Contact Info

Product

Resources

About