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Temperature Programmed Reduction and Spectroscopic Studies of Reduction Behavior of fe/tiO 2 Catalyst
Author(s) -
Chien ShuHua,
Chiang WanLan
Publication year - 1990
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.199000020
Subject(s) - anatase , chemistry , temperature programmed reduction , catalysis , mössbauer spectroscopy , rutile , x ray photoelectron spectroscopy , incipient wetness impregnation , inorganic chemistry , ferric , transition metal , metal , spectroscopy , ilmenite , crystallography , chemical engineering , mineralogy , photocatalysis , organic chemistry , selectivity , physics , quantum mechanics , engineering
Fe/TiO 2 catalyst was prepared by incipient wetness impregnation of TiO 2 with aqueous solution of ferric nitrate. The reduction behavior of the catalyst was studied by temperature programmed reduction profiles, Mössbauer spectroscopy, x‐ray diffraction and x‐ray photoelectron spectroscopy. The results show that the reduction of Fe/TiO 2 was accompanied by a phase transition of anatase to rutile titania. α‐Fe 2 O 3 was reduced to Fe 3 O 4 in the initial reduction stage. Due to the strong support effect of TIO 2 , FeTiO 3 was gradually formed as the reduction temperature reached 450°C. Complete reduction to the metallic Fe° particles occurred at temperatures higher than 670°C. The anatase‐rutile transition was initiated by the reduced Ti 3+ ions and led to the formation of TiO x . At higher reduction temperature, TiO x migrated to the surface of metallic Fe° particles forming FeTiO x in the so‐called strong metal‐support interaction (SMSI) state.