以稀土为助剂的负载型超细铁基变换催化剂的催化性能

以镁铝尖晶石为载体，稀土金属氧化物为助剂，吸附γ-Fe₂O₃胶体法制备了负载型铁系无铬变换催化剂。在负载变换催化剂上，活性组分Fe₃O₄以分立的超细微颗粒分布在镁铝尖晶石载体表面。添加镧、镨稀土金属氧化物明显改善了铁基负载型催化剂的催化活性。在汽/气＝1，空速为2 000 h^-1的反应条件下，镧改性负载型催化剂(FL/MA)的CO的转化率在400 ℃和350 ℃时分别为98%和80%。同时镧改性的负载型催化剂与B117催化剂相比，具有更好的耐热性，在高空速和低汽/气条件下也具有很好的催化活性。

Catalytic behavior of supported ultrafine iron-based water gas shift catalyst promoted by lanthanide oxides

Supported water gas shift (WGS) catalysts promoted by lanthanide oxides were prepared by adsorbing γ-Fe₂O₃ colloid onto MgAl₂O₄ spinel. Fe₃O₄ was dispersed on the surface of MgAl2O4 spinel as discrete ultrafine particles and stabilized by lanthanide oxides. The catalytic activity was apparently enhanced by promotion with La₂O₃ and Pr6O11. CO conversion reached 98% at 400 ℃ and 80% at 350 ℃ over the catalyst promoted by lanthanum oxide at V(steam) / V(gas) = 1 and GHSV = 2000 h^－1. The supported catalyst exhibited superior thermal stability to that of reference commercial catalyst. The catalyst is also applicable to low steam/gas and high space velocity condition with satisfactory activity.