铁柱撑膨润土的一氧化碳水气变换性能

Water-gas shift properties of Fe-PILC for preparation of methanol syngas from CO

研究了铁柱撑膨润土(Fe-PILC)作为CO部分变换制甲醇合成气催化剂的变换性能。钙基膨润土经羟基铁柱撑改性后比表面积由56.8m2/g上升到134.0m2/g,d001值由1.228nm上升至1.556nm;X射线衍射仪(XRD)表征结果表明Fe-PILC的变换活性来源于还原后在层间形成的Fe3O4;变换活性实验结果表明,随着还原温度、变换反应温度的升高,变换率增大,空速2500h-1以内变换率保持稳定;在最高还原温度400℃、反应温度390℃、空速在2500h-1以内、汽气体积比1.4条件下,平均变换率为62.5%,H2/CO体积比为2∶1,符合CO部分变化制甲醇合成气的要求。

The shift properties of CO partial shift is studied, which selects Fe-PILC as a catalyst for preparation of methanol syngas. After the modification exchanging from Ca-PILC to Fe-PILC by hydroxyl-iron, the specific surface area rises to 134.0 m^2/g from 56.8 m^2/g,while d001 rises to 1.556 nm from 1.228 nm. The XRD characterization results show that the shift activity of Fe-PILC is the formation of Fe3O4 after the reduction reaction. The shift activity experimental results show that the shift rate increases with the reduction temperature and the shift reaction temperature, and it remains stable within the space velocity of 2 500 h^-1. The result also show that the average conversion rate can reach 62.5 %, the volume ratio of H2/CO can reach 2： 1, and it is suitable for the preparation request of methanol syngas, under the following conditions： the highest reduction temperature of 400℃, the prime reaction temperature of 390℃, the prime space velocity of less than 2 500 h^-1, the volume ratio of steam to gas of 1.4.