Reconsidering the potential of micropyrolyzer to investigate biomass fast pyrolysis without heat transfer limitations

A Monte Carlo-Based Strategy to Assess Complex Kinetics: Application of the Null-Reaction Method to DAEM

“…It is straightforward to use a linear heating ramp as an analytical formulation of temperature. One can also use an exponential profile of temperature, which would model in a better way a biomass sample inserted in a furnace preheated at fixed temperature: T ( t ) = T normalf [ 1 − ⁢ exp false( prefix− t / t normalc false) ] + T 0 where T f is the furnace final temperature, T 0 is the initial furnace temperature, and t c is a characteristic time of temperature evolution.…”

“…However, this can be difficult to measure because of thermal lag (the temperature difference existing between the sample environment and its bulk). Indeed, thermal transfer resistance can have an important effect on the evaluation of intrinsic kinetic parameters, and then appropriate corrections must be made, such as the temperature profile . As kinetically controlled isothermal pyrolysis is rarely achieved, linear heating ramps, β = d T ( t )/d t , corresponding to the heatup phase of the particles, are often considered .…”

“…Indeed, thermal transfer resistance can have an important effect on the evaluation of intrinsic kinetic parameters, and then appropriate corrections must be made, 4 such as the temperature profile. 5 As kinetically controlled isothermal pyrolysis is rarely achieved, linear heating ramps, β = dT(t)/dt, corresponding to the heatup phase of the particles, are often considered. 6 The difficulty of integrating the reaction rate will depend on the thermal history and the chosen reaction model.…”

Kinetic modelling of biomass fast devolatilization using Py-MS: Model-free and model-based approaches

“…The Frontier micropyrolyzer allows equivalent heating of biomass particles to that of a fluidized bed reactor, reaching a maximum temperature ramp of 110 • C/s for the cup containing the biomass sample [16]. The inability to directly monitor the reaction temperature of the sample has been overcome with the last findings of our group [16].…”

“…The Frontier micropyrolyzer allows equivalent heating of biomass particles to that of a fluidized bed reactor, reaching a maximum temperature ramp of 110 • C/s for the cup containing the biomass sample [16]. The inability to directly monitor the reaction temperature of the sample has been overcome with the last findings of our group [16]. We have demonstrated that under certain sample preparation and heating and gas flow conditions, dynamic pyrolysis experiments with isothermal reacting samples could be conducted knowing the temperature-time profile, which is essential for kinetic evaluation.…”