Effect of metal content on CO2 gasification behavior of K- and Fe-loaded bio-chars

作者：Hanaoka Toshiaki^*; Okumura Yukihiko

来源：Journal of Thermal Science and Technology, 2014, 9(2): 14-00037.

DOI：10.1299/jtst.2014jtst0006

• Boudouard reaction
• CO2
• Char
• Potassium
• Iron

The effects of Fe and K contents of Fe- and K-loaded chars containing 0-23% Fe and 0-20% K, respectively, with negligible amounts of poisoning elements, on the CO2 gasification behavior (C + CO2 -> 2CO) were investigated in the temperature range of 750-1050 degrees C. For 23% Fe-loaded char at gasification temperatures of 900 and 1000 degrees C, the CO2 gasification rate constants (K-p) were respectively 3.3 times and similar to 8 times higher than those of the char without Fe. At 900 degrees C, the K-p value increased with an increase in the Fe content up to 10% and remained almost constant above 10% Fe. For K-loaded chars, the K-p value of the char loaded with 10% K had a maximum value of 5.4 min(-1) at 900 degrees C; this value was similar to 300 times that of the char without K loading and similar to 90 times higher than the corresponding K-p values of Fe-loaded chars at 900 degrees C. The addition of excess K (upon loading greater than 10%) to bio-char decreased the K-p because of the decrease in the number of active sites on the char surface.

• 出版日期2014