沉淀型Fe-Mn工业催化剂的F-T反应性能

在积分固定床反应器中系统考察了用于Fischer-Tropsch(F-T)合成的沉淀型Fe-Mn工业催化剂的性能.首先对催化剂进行了2000h的稳定性测试，然后在不同反应温度、原料气H₂/CO比、空速和总压下考察其反应性能.结果表明，在2000h的运行过程中，该催化剂活性和选择性较平稳，失活速率较小，且在较高的反应温度下失活速率更小，显示出该催化剂具有良好的长期稳定性；经2000h的运行后，该催化剂仍表现出较高的反应活性和稳定性，同时，还保持着较高的低碳烯烃和C₅₊选择性.此外，当反应条件在一定范围内发生变化时，低碳烯烃和C₅₊选择性变化不大，说明该催化剂具有良好的可操作性.

CATALYTIC PERFORMANCE OF COPRECIPITATED Fe-Mn CATALYST IN F-T SYNTHESIS

Light olefins and liquid fuels can be synthesized over the Fe-Mn catalyst from coal-derived syngas via Fischer-Tropsch process.In this paper, the run stability and catalytic performances of an Fe-Mn commercial catalyst prepared by the common coprecipitation method were investigated in an integral fix-bed reactor to provide the reliable data for the industrial practice.Firstly, a 2000-hour stability test of the coprecipitated Fe-Mn catalyst was carried out at 553—568K,H₂/CO=1.96, 3.00MPa and 2000h^-1.It was recognized that CO conversion over the catalyst was as high as 80% even after the 2000-hour run and its deactivation velocity was lower，especially when it was run at higher temperature, which showed that the catalyst had a good extended stability and satisfactory activity.Meanwhile,the light olefins and C₅₊ selectivities were maintained at about 20% and 60%, respectively.The catalytic performances under various reaction conditions were subsequently evaluated.It was found that the light olefins and C₅₊ selectivities changed very little when the reaction conditions were controlled within a certain range, which indicated that the coprecipitated Fe-Mn catalyst had excellent flexibility for F-T run.