Method of preparing a controlled pore volume alumina with citric acid

Method of preparing a controlled pore volume alumina with citric acid

A method for preparing an alumina having controlled pore volume distribution is disclosed. The method requires the presence of 0.1-15% by weight of a water soluble aliphatic polycarboxylic acid having from 2-12 carbon atoms based on the dry weight of Al2O3, during alumina precipitation. The resultan...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Hauptverfasser: CHOCA, MONICA E, BROERSMA, FRANK R
Format: Patent
Sprache:eng
Schlagworte:
CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY
CHEMISTRY
COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM,CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THERARE-EARTH METALS
INORGANIC CHEMISTRY
METALLURGY
PERFORMING OPERATIONS
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
THEIR RELEVANT APPARATUS
TRANSPORTING
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Beschreibung
Zusammenfassung:A method for preparing an alumina having controlled pore volume distribution is disclosed. The method requires the presence of 0.1-15% by weight of a water soluble aliphatic polycarboxylic acid having from 2-12 carbon atoms based on the dry weight of Al2O3, during alumina precipitation. The resultant calcined alumina has a pore volume distribution such that: A. Nitrogen desorption measurements indicate that less than 10% of the total pores as determined by said method fall between 100-1200A in diameter; B. Nitrogen adsorption measurements indicate that between 10-50% of the total pore volume as determined fall between 100-1200A in diameter; and C. Mercury penetration porisimetry indicates that less than 10% of the total pores as determined by both nitrogen desorption and mercury methods fall between 100-50,000A in diameter.