Use of autocatalytic kinetics to obtain composition of lignocellulosic materials

Modelling of pyrolysis and combustion of gluten–glycerol-based bioplastics

“…(1) turns into classical nth-order kinetic equation if the nucleation order is zero. When the importance of the autocatalysis increases (high heating rate and oxidative atmosphere), the nucleation order also increases (Barneto et al, 2009a). This fact affects the DTG curve, turning broad peaks into sharp peaks which are inconsistent with the nth-order model.Using the volatile weight (V i ) obtained from each pseudocomponent, Eq.…”

“…Thermogravimetric analysis, TG, is a powerful tool to monitor the thermal degradation of biopolymers under inert (pyrolysis) or oxidative (combustion) atmospheres (Barneto et al, 2009a). TG analysis has been applied to study the thermal degradation of soy-based bioplastics (Swain et al, 2005;Das et al, 2008;Nanda et al, 2007).…”

Kinetic models based in biomass components for the combustion and pyrolysis of sewage sludge and its compost

“…6 shows the effect of oxygen presence in both types of sludge (fresh and composted) at 10 8C/ min. Likewise, in this figure, these curves are compared with a similar curve obtained for a lignocellulosic biomass [34]. Analysis of the obtained curves provides information about combustion of the sludge.…”

An improved model for the kinetic description of the thermal degradation of cellulose

“…Nevertheless, most authors still consider that complex multistep models are not needed to simulate the weight loss behavior during the pyrolysis of cellulose, and that single step models are sufficient to describe the system adequately since ''depolymerization by transglycosylation'', namely the scission of the internal glycosidic bonds, has been reported to be the limiting step (Varhegyi et al 1994;Mamleev et al 2006). Within the single step models, first order (Varhegyi et al 1994;Antal et al 1998;Shen and Gu 2009) or nth order kinetics (Barneto et al 2009) are still assumed in the majority of the situations. However, some authors have recently found autoaccelerated models such as Avrami-Erofeev or Prout-Tompkins, which are commonly related to nucleation and growth mechanisms, to be a better depiction (Dollimor and Holt 1973;Reynolds and Burnham 1997).…”

“…Thus, since any list of kinetic models is inevitably incomplete, the best fit in a set does not necessarily imply that the selected model is the right one. Additionally, in many cases the kinetic models are used merely as fitting equations and hence they grant no further understanding of the degradation mechanism (Capart et al 2004;Barneto et al 2009). …”