无铬中变催化剂的XRD研究

HIGH TEMPERATURE WATER GAS SHIFT CATALYST WITHOUT CHROMIUM BY XRD

以Ｘ光衍射作研究手段，对无铬中变催化剂的氧化态和还原态进行了研究．结果表明，无铬中变催化剂氧化态是非晶态的ｒ－ＦｅＯＯＨ，还原态主要是一种反尖晶石结构，主要物相为Ｆｅ３Ｏ４，ＭｅＯ，（Ｍｅ，Ｆｅ）Ｆｅ２Ｏ４，ＣｅＭｅ５等。

This paper studies phases of oxygenation and reduction states of high temperature water gas shift catalyst without chromium by XRD. The oxygenation state of the catalyst is non crystalline r FeOOH, and reduction state is a reverse spinel. The major phases are Fe 3O 4, MeO, (Me,Fe)Fe 2O 4, CeMe 5. The relations among activition of the catalyst, amount of Me(NO 3) 2 and XRD spectra are studied.