类水滑石衍生镁铁混合氧化物的催化性能

CATALYTIC ACTIVITIES OF Mg-Fe OXIDES DERIVED FROM HYDROTALCITE LIKE COMPOUND FOR REVERSED WATER-GAS SHIFT REACTION

采用共沉淀法合成镁铁类水滑石 ,以其为前体 ,制备了镁铁混合氧化物 ,并对样品进行 X射线衍射分析、差热分析及比表面积测定 ,研究其对逆水煤气变换反应的催化性能 .结果表明 :催化剂前体具有类水滑石的层状结构 ,衍生得到的 Mg/Fe( mol/mol)为 1的混合氧化物在温度为 650℃ ,CO2 /H2 ( m ol/mol)为 4 /1 ,H2 空速为 2 850 h-1时催化性能最好 ,H2 的转化率为 71 .5% ,CO的选择性近乎 1 0 0 %

Synthesized by coprecipitation, Mg Fe O mixed oxides with different atomic ratios are derived from hydrotalcite like compound precursors, and applied to reversed water gas shift reaction. It is detected by XRD, DTA and surfase. The best catalytic activity result of 71.5% H 2 conversion and 100% CO selectivity could be attained with sample Mg/Fe (mol/mol) be 1 when the reaction temperature is 650 ℃ and the CO 2/H 2 (mol/mol) is 4/1, H 2 space velocity is 2 850 h -1 .