Two types of char were made through rapid quenching in liquid nitrogen (Char-Q) and natural cooling in argon (Char-S). Systematic comparison was performed for the chars in terms of structure and gasification characteristics measured in the micro-fluidized bed reaction analyzer (MFBRA)

a well-proven isothermal reaction analyzer developed by Institute of Process Engineering

Chinese Academy of Sciences. Char-Q had the higher surface area but smaller average size of pores

while Char-S from slow cooling showed higher degree of graphitization. Gasification tests in MFBRA demonstrated that Char-Q had obviously higher reaction rate

and activation energy determined according to the iso-conversion method was higher for Char-S. Particularly

MFBRA enabled the determination of activation energy not only for the overall C conversion but also for the formation reactions (a reaction system) of every individual gas component

thus allowing a rather comprehensive analysis of the reaction nature. Consequently

in order to get the gasification characteristics close to the hot char intrinsic nature

Char-Q should be used

while MFBRA provided as well a more effective instrument for measurement of the differential reaction characteristics involving steam agent.