Surface characteristics and catalytic activity of binary oxides of alumina-yttria

Journal Article · Wed Jun 01 00:00:00 EDT 1994 · Materials Research Bulletin; (United States)

DOI:https://doi.org/10.1016/0025-5408(94)90121-X· OSTI ID:7036828

Jayasree, J; Narayanan, C S ^[1]

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1. Regional Research Lab., Kerala (India)

A series of different compositions of Al[sub 2]O[sub 3]-Y[sub 2]O[sub 3] catalysts were prepared by coprecipitation with aqueous ammonia. The structure, thermal stability and surface properties of the catalysts were determined using XRD, TGA, SEM and MAS [sup 27]Al NMR. Acidity and basicity of catalysts were determined using Hammet indicators and surface area by BET method. Surface area and Bronsted acidity of the catalysts decreased with increasing amount of Y[sub 2]O[sub 3]. No basic sites were observed over catalyst samples with higher Y[sub 2]O[sub 3] content. (+)-Limonene oxide isomerization was carried out at 110 C over the catalysts. The activity and selectivity of catalysts varied with composition. Catalysts with high alumina content yielded more diol while less alumina containing samples produced more ketones.

• OSTI ID: 7036828
• Journal Information: Materials Research Bulletin; (United States), Vol. 29:6; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ALUMINIUM OXIDES
CATALYTIC EFFECTS
SURFACE PROPERTIES
GLYCOLS
SYNTHESIS
KETONES
YTTRIUM OXIDES
CHEMICAL PREPARATION
NUCLEAR MAGNETIC RESONANCE
PH VALUE
SCANNING ELECTRON MICROSCOPY
THERMAL GRAVIMETRIC ANALYSIS
X-RAY DIFFRACTION
ALCOHOLS
ALUMINIUM COMPOUNDS
CHALCOGENIDES
CHEMICAL ANALYSIS
COHERENT SCATTERING
DIFFRACTION
ELECTRON MICROSCOPY
GRAVIMETRIC ANALYSIS
HYDROXY COMPOUNDS
MAGNETIC RESONANCE
MICROSCOPY
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
QUANTITATIVE CHEMICAL ANALYSIS
RESONANCE
SCATTERING
THERMAL ANALYSIS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
400201* - Chemical & Physicochemical Properties