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 00:00:00 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), Vol. 52:1
• Country of Publication: United States
• Language: English

Related Subjects

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