What limits the yield of levoglucosan during fast pyrolysis of cellulose?

Proano-Aviles, Juan

doi:10.31274/etd-180810-5222

Cited by 2 publications

(2 citation statements)

References 124 publications

(240 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The results of the MSMR molding (refer to Figure a) clearly indicate a secondary reaction beginning at ∼380 °C, which could be related to decomposition of levoglucosan (i.e., active cellulose, m ac ). Other experimental studies, using a wire-mesh captive sample reactor, have observed a drop in the heating rate at ∼400 °C for the decomposition of cellulose. , The bifurcated peak form for cellulose has also been observed in other temperature-scanning experiments; however, the MSMR used here captures the gaseous products in real time from which the temperature of the particle was determined. Changes in the thermal decomposition mechanism for cellulose fast pyrolysis (in an isothermal experiment) from chain-end scission to intrachain cleavage was observed by other studies at a temperature above 467 °C, , and the activation energy was reported to increase above 460 °C which is also directionally consistent with the results of this study; refer to Figure a.…”

Section: Resultssupporting

confidence: 61%

Biomass Fast Pyrolysis Using a Novel Microsphere Microreactor Approach: Model-Based Interpretations

2019

View full text Add to dashboard Cite

A novel microsphere microreactor approach was used to capture the real-time dynamics of fast pyrolysis of single biomass microspheres using fast flame ionization detection at a data capture rate of 10,000 Hz. Time-domain pyrolysis data were transformed temperature domain using a model-based approach. The apparent kinetics of pyrolysis was systematically investigated as a function of size and type of biomass particle and reactor temperature. A mechanism for fast pyrolysis of crystalline cellulose that suggests a parallel series dependent pathway is proposed and supported.

show abstract

Section: Resultssupporting

confidence: 61%

Biomass Fast Pyrolysis Using a Novel Microsphere Microreactor Approach: Model-Based Interpretations

2019

View full text Add to dashboard Cite

show abstract

“…The previously proposed mechanisms for LG formation are generally limited to dimers and trimers of cellulose and anhydrocellulose, however the experimental works of Lindstrom et al [18] and of Proano-Aviles [30] show clearly that the generation of LG is dictated by a balance of mid-chain cracking and chain-end LG generating reactions, highlighting the importance of considering cellulose polymers rather than short chain oligosaccharide structures. Additional kinetic investigation on depolymerisation and LG formation from cellulose polymer is yet to be reported.…”

Section: Introductionmentioning

confidence: 99%

Mechanistic and kinetic investigation on maximizing the formation of levoglucosan from cellulose during biomass pyrolysis

Shaw

Zhang

Kabalan

et al. 2021

Fuel

View full text Add to dashboard Cite

Attempts to understand and control the formation of levoglucosan, as a key bio-oil compound and an important intermediate chemical, during biomass pyrolysis have recently generated a large number of experimental and computational studies. Whilst promising mechanisms have been put forward to explain levoglucosan formation, there has yet to be clarity on the factors that inhibit the stoichiometric yields from cellulose, and, current available mechanisms adopt model compounds of short chain oligosaccharide structures rather than cellulose polymer. In this work, kinetic models describing cellulose (with Degree of Polymerisation DP of 2048) decomposition and levoglucosan formation have been constructed.It was found that temperature and residence time co-ordinately influenced the yield of levoglucosan, i.e. maximum yield can be reached within 80 seconds at 600 o C, however, around 10 minutes is required at 550 o C. Anhydro-oligosaccharides greater than DP8 will be generated and then consumed in 60 seconds with pyrolysis temperatures of 500 o C and over. The results also showed that the current available concerted initiation and depropagation reactions are insufficient to explain the experimentally observed high rates of cellulose depolymerisation and levoglucosan formation, other key factors such as side reactions have to be considered.Additionally, it was found that the rate of levoglucosan generation is independent of the initial cellulose chain length, which is a finding that will facilitate future studies in the area of bioenergy and biomass decomposition.

show abstract

What limits the yield of levoglucosan during fast pyrolysis of cellulose?

Cited by 2 publications

References 124 publications

Biomass Fast Pyrolysis Using a Novel Microsphere Microreactor Approach: Model-Based Interpretations

Biomass Fast Pyrolysis Using a Novel Microsphere Microreactor Approach: Model-Based Interpretations

Mechanistic and kinetic investigation on maximizing the formation of levoglucosan from cellulose during biomass pyrolysis

Contact Info

Product

Resources

About