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Effect of the Phase of Titanium Oxide on Metal‐Support Interaction
Author(s) -
Chang ChunShow,
Jong SungJeng,
Cheng Soofin
Publication year - 1995
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.199500006
Subject(s) - chemisorption , chemistry , titanium , metal , titanium oxide , adsorption , oxide , sintering , inorganic chemistry , transmission electron microscopy , platinum , phase (matter) , chemical engineering , catalysis , organic chemistry , engineering
The metal‐support interaction in the system of platinum supported on titanium oxides of different crystalline structures was investigated. Titanium oxide powders used as supports were prepared by neutralization of TiOCl 2 ‐analogue solution with either NaOH or NH 3 base at varied pH. Pt was introduced onto the supports by impregnation. The phenomenon of strong metal‐support interaction (SMSI) was determined by the suppression of chemisorption of H 2 over samples reduced at 773 K, in comparison with the behavior of samples reduced at 473 K. The loss of adsorption capacity was proved not due to metal sintering by examining the recovery of adsorption capacity after reduction, reoxidation and reduction cycle, accompanied with examination of the size of Pt particle with an x‐ray diffractiometer and a transmission‐electron microscope. The results showed that SMSI phenomenon was common to Pt supported on titanium oxides of all the varied crystalline structures. However, the chemisorption capacity of Pt reduced at 473 K varied greatly with the sodium content in the supports, which in turns affects the crystalline structure of titanium oxide. These results are attributed mainly to electronic effect endowed by the support.