CO变换制氢催化剂PH3中毒的热力学

摘要

The possibility of chemical reaction and products in the poisoning process of B1 12 catalyst by PH3 at the high temperature transfer range was studied based on the thermodynamics, and the main reactions which led to B112 catalyst poisoning were determined. The results showed that at 623-803 K, the catalyst active center Fe3O4 and PH3 generated different iron compounds at different phosphorus in different atmosphere. In the presence of O2, CO, CO2 and H2O, they could react with Fe3O4 and PH3, respectively, and could produce FeP, FeP2 and FePO4. In the presence of CO, Fe3P and Fe2P would occur, and in the presence of CO and CO2, carbon deposition could form. The phosphate and carbon deposition caused catalyst poisoning temporarily and the reaction product FeP, FeP2, Fe2P and Fe3P caused catalyst poisoning permanently.%从热力学角度分析了高温变换温度范围内B112型变换催化剂PH3中毒过程中可能发生的化学反应及其产物,确定导致催化剂中毒的主导反应.结果表明,在623～803 K,催化剂活性中心Fe3O4和PH3在不同气氛下会生成不同的磷铁化合物.在O2,CO,CO2和H2O气体分别参与Fe3O4和PH3反应时,都可能生成FeP,FeP2和FePO4.在CO存在下,还可能生成Fe3P和Fe2P;在CO和CO2存在下,还可能生成C,形成积炭.磷酸盐和积炭会造成暂时性中毒,而FeP,FeP2,Fe2P和Fe3P造成水久性中毒.