TY - JOUR
T1 - Gasification of woody biomass char with CO2
T2 - The catalytic effects of K and Ca species on char gasification reactivity
AU - Mitsuoka, Keiichirou
AU - Hayashi, Shigeya
AU - Amano, Hiroshi
AU - Kayahara, Kenji
AU - Sasaoaka, Eiji
AU - Uddin, Md Azhar
N1 - Copyright:
Copyright 2011 Elsevier B.V., All rights reserved.
PY - 2011/1
Y1 - 2011/1
N2 - The effects of alkali and alkaline earth metals such as potassium (K) and calcium (Ca) on CO2 gasification reactivity of Japanese cypress (hinoki) char under various temperatures (1123-1223 K) and CO2 concentration (20-80 vol.%) were studied using thermal gravimetric analysis. The presence of K and Ca compounds in char improved the reactivity of hinoki char for CO2 gasification catalytically. It was also confirmed that K and Ca compounds can be supported on char to exhibit an enhanced catalytic effect during CO2 gasification of K-char and Ca-char. The char gasification rate increased with the increase of CO2 concentration at higher temperatures (1173-1223 K), however at lower temperature (1123 K) the gasification rate decreased at 80% CO2. The retardation of char gasification rate at higher CO2 concentration is caused by the inhibition effect of CO: CO is disproportionated on alkali metal catalysts to CO2 and carbon, and affected the CO2 gasification rate. The dependence of char gasification rate on reaction temperature yielded a straight line in an Arrhenius-type plot which indicated that there was no significant change in the gasification mechanism in the temperature range of 1123-1223 K.
AB - The effects of alkali and alkaline earth metals such as potassium (K) and calcium (Ca) on CO2 gasification reactivity of Japanese cypress (hinoki) char under various temperatures (1123-1223 K) and CO2 concentration (20-80 vol.%) were studied using thermal gravimetric analysis. The presence of K and Ca compounds in char improved the reactivity of hinoki char for CO2 gasification catalytically. It was also confirmed that K and Ca compounds can be supported on char to exhibit an enhanced catalytic effect during CO2 gasification of K-char and Ca-char. The char gasification rate increased with the increase of CO2 concentration at higher temperatures (1173-1223 K), however at lower temperature (1123 K) the gasification rate decreased at 80% CO2. The retardation of char gasification rate at higher CO2 concentration is caused by the inhibition effect of CO: CO is disproportionated on alkali metal catalysts to CO2 and carbon, and affected the CO2 gasification rate. The dependence of char gasification rate on reaction temperature yielded a straight line in an Arrhenius-type plot which indicated that there was no significant change in the gasification mechanism in the temperature range of 1123-1223 K.
KW - Alkali and alkaline earth metals
KW - Biomass char
KW - CO gasification
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U2 - 10.1016/j.fuproc.2010.08.015
DO - 10.1016/j.fuproc.2010.08.015
M3 - Article
AN - SCOPUS:77958514582
VL - 92
SP - 26
EP - 31
JO - Fuel Processing Technology
JF - Fuel Processing Technology
SN - 0378-3820
IS - 1
ER -