Pore size distribution and catalytic activity in isopropanol dehydration of porous anodic alumina films

Book · Sat Jan 01 04:00:00 EST 1977

OSTI ID:5768505

Ihm, S K

Nitrogen isotherms were measured on alumina films prepared by anodic oxidation of aluminum foils in oxalic acid. The films contain parallel cylindrical pores which are closed at one end and have average pore diameters of 68-128 nm for the applied voltages of 25-50 V, and a pore density of about 10/sup 10/ pores/sq cm. The pore size distributions were computed by using Kelvin, Cohan, and Broekhoff-de Boer equations and were compared with direct transmission electron microscopy (TEM) measurements. The Broekhoff-de Boer equation for cylindrical pores closed at one end agreed best with the TEM results, the average pore diameter agreeing within 30% error. Anodic alumina sheets calcined at 620/sup 0/C were used for the first time to study the kinetics of dehydration of isopropyl alcohol. The catalytic activation energy was smaller than that using other aluminas.

• OSTI ID: 5768505
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ALCOHOLS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CALCULATION METHODS
CARBOXYLIC ACIDS
CATALYSIS
CATALYTIC EFFECTS
CHALCOGENIDES
CRYSTAL STRUCTURE
DEHYDRATION
DICARBOXYLIC ACIDS
FILMS
HIGH TEMPERATURE
HYDROXY COMPOUNDS
MEASURING METHODS
MICROSTRUCTURE
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXALIC ACID
OXIDES
OXYGEN COMPOUNDS
PROPANOLS