The relationship between the oxidation activity and the acid-base properties of Fe/sub 2/O/sub 3/-based mixed oxides. 1. The Fe/sub 2/O/sub 3/-V/sub 2/O/sub 5/ AND Fe/sub 2/O/sub 3/-MoO/sub 3/ systems

Journal Article · Thu Mar 30 04:00:00 EST 1978 · J. Catal.; (United States)

OSTI ID:5997667

Ai, M

With increasing vanadium pentoxide content in Fe/sub 2/O/sub 3/ catalysts, the surface area went through a maximum at approx. 10 atom % vanadium; the acidity, as measured by ammonia and pyridine adsorption, increased nearly linearly; the initial isopropanol dehydration rate at 175/sup 0/C varied as the acidity and could be used as an indicator of acidity; the basicity, as measured by carbon dioxide and acetic acid adsorption, decreased rapidly; the ratio of isopropanol dehydrogenation to dehydration followed the basicity curve and can be used as a measure of basicity; the isomerization of 1-butene and 2-butene under oxidative conditions correlated with the acidity; the air oxidation of butadiene to maleic anhydride correlated with acidity and had 40-50% selectivity at total conversion (at high vanadium content); and the conversion of 1-butene to butadiene at 0.34-1.3 mole % oxygen concentration increased at low vanadium content and then decreased. With increasing MoO/sub 3/ content in Fe/sub 2/O/sub 3/, the acidity went through a maximum at 30-40 atom % molybdenum, and isopropanol dehydration, 1-butene iomerization and oxidative dehydrogenation, and butadiene oxidation correlated with acidity. Graphs and 28 references.

• Research Organization: Tokyo Inst. of Tech., Japan
• OSTI ID: 5997667
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 52:1; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ACETIC ACID
ALKENES
AMMONIA
AZINES
BUTADIENE
BUTENES
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CARBOXYLIC ACIDS
CATALYSTS
CHALCOGENIDES
CHEMICAL REACTIONS
DEHYDRATION
DEHYDROGENATION
DIENES
ELEMENTS
HETEROCYCLIC COMPOUNDS
HYDRIDES
HYDROCARBONS
HYDROGEN COMPOUNDS
IRON COMPOUNDS
IRON OXIDES
MEASURING METHODS
METALS
MOLYBDENUM
MONOCARBOXYLIC ACIDS
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PH VALUE
POLYENES
PROCESSING
PYRIDINES
SURFACE AREA
SURFACE PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
VANADIUM