Pillared clays with enhanced broensted acidity

Conference · Fri Dec 01 04:00:00 EST 1995

OSTI ID:126765

Clearfield, A; Tsai, Tsung-Yen; Cahill, R A ^[1]

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1. Texas A & M Univ., College Station, TX (United States)

Pillared clays are a new class of three-dimensional microporous materials with pore diameters in the 8-12{Angstrom} range. Calcination of these materials to 500{degrees}C and above results in significant loss of Bronsted acidity. Sulfated oxides of Zr, Ti, and Sn have been reported to behave as superacid catalysts. We therefore sought to improve the Bronsted acidity of the pillared clays by post synthesis treatment of the oxi and phosphate ions. It was found that the reactivity and rehydration of the pillars depends upon the temperature of calcination. Treatment of the pillared clays with dilute acid resulted in solution of significant amounts of pillar oxide without collapse of the pillars. The sulfated and phosphated products retained Bronsted acidity to quite high temperatures and were catalytically more reactive. Comparison of the catalytic results with those of the similarly treated oxides will be described.

• OSTI ID: 126765
• Report Number(s): CONF-950402--
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
40 CHEMISTRY
BROENSTED ACIDS
CALCINATION
CATALYSTS
CATALYTIC EFFECTS
CHEMICAL PROPERTIES
CLAYS
IONS
SULFATES
SYNTHESIS
TEMPERATURE DEPENDENCE
TIN OXIDES
TITANIUM OXIDES
ZIRCONIUM OXIDES