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Effect of high temperature treatment on the properties of fe‐mo oxide catalysts
Author(s) -
Aruanno Jorge,
Wanke Sieghard
Publication year - 1975
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450530310
Subject(s) - catalysis , thermogravimetric analysis , molybdenum , molybdate , formaldehyde , methanol , oxide , scanning electron microscope , adsorption , inorganic chemistry , materials science , nitrogen , sodium molybdate , chemistry , nuclear chemistry , chemical engineering , metallurgy , organic chemistry , composite material , engineering
In this study the structural and compositional changes that Fe‐Mo oxide catalysts undergo during treatment at elevated temperatures were investigated. Commercial and laboratory prepared catalysts were examined. The changes in catalyst properties were determined by low temperature nitrogen adsorption, scanning electron microscopy, X‐ray diffraction, X‐ray fluorescence and thermogravimetric analysis. The activities of the catalysts for the oxidation of methanol in air to formaldehyde were measured using an integral bed reactor. The results showed that treatment at elevated temperatures resulted in the growth and segregation of Fe 2 (Mo0 4 ) 3 and Mo0 3 crystals resulting in a loss of specific surface area. The changes in specific activity can be explained in terms of molybdenum depletion from a molybdenum rich iron molybdate phase.