The Reactivity of Coal Chars Gasified in a Carbon Dioxide Environment

Coal and biomass char reactivities in gasification and combustion environments

“…The activation energies are within the ranges expected for the type reactions considered, in that several are in line with values previously published for chars and activated carbons. For example, the activation energy of reaction R.10 is in agreement with other observations [57,74,75] and the activation energy for reaction R.14 is similar to other findings [76][77][78]. Also, the activation energies of the desorption reactions (R.4, R.12r and R.18) are in agreement with results of temperature-programmed desorption experiments performed by other researchers [21,43,45,79].…”

Coal gasification in CO2 atmosphere and its kinetics since 1948: A brief review

“…Modeling results revealed that at high particle surface temperatures the CeCO 2 reaction is activated and occurs in addition to the CeO 2 reaction and the maximum combustion rate is increased in comparison to the rate with O 2 alone. Char reactivity with CO 2 was also found to be related to the parent coal properties [155].…”

Combustion modelling opportunities and challenges for oxy-coal carbon capture technology

“…In high temperature regimes, H 2 O and H 2 effects on char gasification are more important than radical effects. In this case, the water-gas shift reaction is of great importance, especially when temperature is higher than 1473 K (Hampartsoumian et al, 1993). The authors assume that the rate of gasification of char with CO 2 and H 2 O are similar.…”

“…The rate of the gasification of char by CO 2 is influenced by char composition, ash content, internal pore surface area and the properties of the parent coal (Hampartsoumian et al, 1993). In addition, the heating rate of the coal has a significant effect on the gasification process (Liu et al, 2008).…”