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用程序升温还原(TPR)和X-射线衍射(XRD)法研究了铁对两类典型的烃类制氢催化剂还原性能的影响。观察到单组分氧化铁的还原经过两个步骤,而氧化镍则一步还原成镍,且前者比后者难还原。若把氧化铁加进两类催化剂中,发现在一定条件下氧化铁可促进两类催化剂的还原。其作用的机制是氧化铁先与载体发生固溶,使Ni~(2+)在高温下向载体扩散的过程受到抑制,从而减弱了氧化镍和载体之间的相互作用。
The effects of iron on the reduction performance of two typical hydrocarbon hydrogen-producing catalysts were investigated by temperature-programmed reduction (TPR) and X-ray diffraction (XRD). It is observed that the reduction of the one-component iron oxide proceeds in two steps, whereas the nickel oxide is reduced in one step to nickel, and the former is more difficult to reduce than the latter. If iron oxide is added to both types of catalyst, iron oxide is found to promote the reduction of both types of catalyst under certain conditions. The mechanism is that the iron oxide first forms a solid solution with the support, so that the diffusion process of Ni 2+ to the support at high temperature is suppressed, thereby weakening the interaction between the nickel oxide and the support.