Structure of Fe, Mn-promoted sulfated zirconia catalyst by X-ray and IR absorption spectroscopies

摘要: The rate of butane isomerization at low temperature is more than two orders magnitude greater over sulfated zirconia with iron and manganese unpromoted zirconia. Therefore, the bulk surface structures promoted catalysts have been investigated using X-ray absorption spectroscopy Zr Fe K-edges FTIR adsorbed pyridine CO. Zr—O Zr—Zr interatomic distances derived from EXAFS indicated that both were exclusively tetragonal regardless composition. In addition, revealed ions did not substitute in structure, but likely to be present small clusters or rafts supported on IR spectra, associated sulfate groups, CO, minimally affected by promoters indicating Mn do alter properties oxides an obvious manner. Thus, dramatic effect reaction due extremely active site densities need for sites mechanism both.