We have investigated the kinetics and catalytic activity of CO2-lignite gasification with various metal precursors as catalysts. K2CO3, Mn(NO3)2, and Ce(NO3)3 were used and impregnated on a coal using an evaporator. The gasification experiments were carried out with the low rank coal loaded with 5 wt% catalyst at the temperature range from 700∼900 ℃ and atmospheric pressure with the N2-CO2 reactant gas mixture. The catalytic effect on the gasification rate of the low rank coal with CO2 was determined by the thermogravimetric analyzer. It was observed that the low rank coal reached the complete carbon conversion regardless of the kinds of catalysts at 900 ℃ from the results of TGA. The catalytic activity was ranked as 5 wt% K2CO3>5 wt% Mn(NO3)2>5 wt% Ce(NO3)3> Non-catalyst at 900 ℃. The gasification rate increased with increasing the temperature. The activation energy of the catalytic gasification with 5 wt% K2CO3 was 119.0 kJ/mol, which was the lowest among all catalysts.

촉매를 이용한 CO2-석탄 가스화의 kinetic 및 촉매 활성에 대해 조사하였다. 석탄에 촉매로 K2CO3와 Mn(NO3)2, Ce(NO3)3를 진공증발기를 이용하여 담지하였다. 가스화 실험은 5 wt%의 촉매를 담지한 저급석탄을 TGA를 사용하여 온도 700∼900 ℃범위에서 N2와 CO2 반응가스로 진행하였다. TGA 실험 결과 900 ℃에서 모든 촉매의 종류에 관계없이 저급석탄은 탄소 전환율 100%에 도달하였으며 촉매 가스화속도는 5 wt% K2CO3>5 wt% Mn(NO3)2>5 wt% Ce(NO3)3> Non-catalyst 순으로 나타났다. 가스화 속도는 온도가 증가함에 따라 증가하는 것을 관찰하였으며 5 wt% K2CO3의 경우 가스화반응 활성화 에너지가 119.0 kJ/mol로 가장 낮게 얻어졌다.