摘要
C+CO_2 2CO是煤气化中一个重要的基本反应,对该反应能否产生有效的催化作用是选择催化剂的重要依据。迄今,对K_2CO_3、Na_2CO_3等研究较多,它们具有很高的催化活性,但用量大,不易回收。碱土金属、过渡金属及其化合物用量少,价廉,但活性低。近几年关于混合物对煤气化的催化作用有不少报道。
Catalytic effect of a variety of complex catalysts on the reaction C+CO_2=2CO has been investigated by thermogravimetry method at ambient pressure. A disposable catalyst FeCl_3+Na_2SO_4 was fouud to possess high activity and low price. The optimum weight ratio of FeCl_3 to Na_2SO_4 in this catalyst is Na/Fe=1. The catalytic activity increases nonlinearly with increasing catalyst content in carbon. Under the same reaction condition, the activity of some typical catalysts was found in the following orders: FeCl_3+Na_2SO_4>Na_2CO_3>Fe_3O_4+Na_2SO_4>NiCl_2+Na_3SO_4>FeCl_3+Na_2CO_3>Fe Cl_3.The results of XRD analysis showed that the catalytic mechanism is an oxidation-reduction cycle in which iron acts as an oxygen carrier. The transfar of oxygen from CO_2 to C is completed by iron. Sodium is a disperser which improves the dispersion of iron.
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
1990年第4期382-384,共3页
Journal of Fuel Chemistry and Technology
关键词
煤
气化
CO2
还原反应
催化剂
catalytic gasification
Fe-Na catalyst
CO_2 reduction reaction
