铁系无铬型CO高温变换催化剂的谱学研究

SPECTROSCOPIC STUDY ON IRON BASED NON CHROMIUM CATALYST FOR CO HIGH TEMPERATURE SHIFT

用Ｍ¨ｏｓｂａｕｅｒ谱，ＸＲＤ及ＴＥＭ技术对铁系无铬型催化剂的前驱态、母体及还原态在不同工艺条件下的生成及晶相结构的微变过程进行了研究．确证了水合四氧化三铁Ｆｅ３－ｘＯ４·ｎＨ２Ｏ和γＦｅ２Ｏ３晶态的形成，并探讨了晶相参数微变引起晶体结构的差异导致的催化活性的变化．在Ｆｅ３－ｘＯ４·ｎＨ２Ｏ中ＳＢ／ＳＡ比值为２，ｘ值接近于０时催化活性最高．

By means of Mssbauer spectroscopy, XRD and TEM techniques, the formation of pre-matrix, matrix and reduction state of Fe based non-chromium (NBC 1) catalyst under different operation conditions and the microchange process of the crystal structure are studied. It is proved that Fe_x^3- O_4· n H_2O and γ Fe_2O_3 crystals are formed. The difference of crystal structure caused by the microchange of crystal phase parameters leads to the change of catalyst activity. When the S B/ S A for Fe_x^3- O_4· n H_2O is 2, and the x value approaches 0, the best catalyst activity will be reached.