LEDFORD, JS KIM, YM HOUALLA, M PROCTOR, A HERCULES, DM 2024-01-21T23:10:48Z 2024-01-21T23:10:48Z 2022-01-11 1992-03 0003-2654 https://pubs.kist.re.kr/handle/201004/146458 The effect of the addition of La on the structure of 3% m/m Co/Al2O3 catalysts has been studied by the combined use of X-ray photoelectron spectroscopy, Raman spectroscopy, X-ray diffraction and gravimetric analysis. It was shown that La exists as a highly dispersed La-Al2O3 interaction species for alumina carriers impregnated with La and calcined at 600-degrees-C. For 3% m/m Co/Al2O3 catalysts containing La, little effect is observed for La/Al atomic ratios below 0.0075. For higher La loadings, an increase in Co dispersion is observed owing to suppression of Co3O4 formation. Tetrahedral Co2+ and a small amount of an La-Co surface phase are formed. Formation of tetrahedral Co2+ is caused by migration of Co from the La-Co surface phase into the alumina support during calcination at 600-degrees-C. English ROYAL SOC CHEMISTRY PHOTOELECTRON-SPECTROSCOPY SURFACE-ANALYSIS OF LANTHANUM-MODIFIED COBALT CATALYSTS - INVITED LECTURE Article 10.1039/an9921700323 1 ANALYST, v.117, no.3, pp.323 - 327 ANALYST 117 3 323 327 scie scopus A1992HM86300016 2-s2.0-0010374937 Chemistry, Analytical Chemistry Article; Proceedings Paper PHOTOELECTRON-SPECTROSCOPY CATALYST SURFACE ANALYSIS RAMAN SPECTROSCOPY X-RAY PHOTOELECTRON SPECTROSCOPY SURFACE PHASE