用穆斯堡尔谱研究镧改性铁催化剂的表面氧化性能

SURFACE OXIDATIVE PROPERTIES OF LANTHANA-MODIFIED IRON CATALYSTS STUDIED BY MOSSBAUER METHOD

用穆斯堡尔谱研究镧改性铁催化剂的表面氧化性能周钰明（东南大学化学化工系，南京２１００９６）张爱民，丁莹如（南京大学化学系，南京２１００９３）关键词氧化镧改性，氧化作用，氧化铁催化剂，氢，一氧化碳在催化反应中，反应物分子首先吸附到催化剂表面，催化剂活性...

n situ Mossbauer spectroscopy has been used to study the surfaceoxidative properties of Fe2O3/γ-Al2O3, Fe2O3-La2O'3/γ-Al2O3 and Fe2O3/La2O3/γ-Al2O3 during H, desorption and CO chemisorption. The resultsshow that the addition of La2O3 to Fe2O3/γ-Al2O3 catalyst results in partial coverage of the supported Fe crystallites with LaOx. The moietyblocks which are probably exchanged into iron oxide crystal lattices prevent iron oxides from transferring into Fe2O3 crystal lattices. So Fe2O3/γ-Al2O3 catalyst with added La2O3 can not form Fe3O4 phase during H2desorption and CO chemisorption.