Preparation and thermal properties of Zr-intercalated clays

Journal Article · Fri Sep 01 00:00:00 EDT 1989 · Journal of Catalysis; (USA)

DOI:https://doi.org/10.1016/0021-9517(89)90137-1· OSTI ID:6843771

Figueras, F; Mattrod-Bashi, A; Fetter, G; Thrierr, A ^[1]; Zanchetta, J V ^[2]

---

1. Laboratoire de Chimie Organique Physique et Cinetique Chimique Appliquees, Montpellier (France)
2. Laboratoire de Chimie Physique, Montpellier (France)

Montmorillonites intercalated by zirconium macrocations have been prepared. Diffusion of the Zr cations within the particles of clay controls the rate of ion exchange, and hence the distribution of the Zr pillars. This effect accounts for the influence of particle size on the degree of exchange, the surface area, and the thermal stability of the pillared clay. The thermal stability of the Zr clays prepared under these conditions is limited to 973 K in dry air. The changes in microporosity, evaluated from nitrogen adsorption using the equation of Dubinin, show that collapse of the structure occurs by sintering of the pillars. This sintering can be decreased by doping the pillars with rare earth cations. The resulting material then retains a surface area of 180 m{sup 2}/g after calcination at 1023 K in dry air, and is more acidic than the corresponding Zr-clay.

• OSTI ID: 6843771
• Journal Information: Journal of Catalysis; (USA), Vol. 119:1; ISSN 0021-9517
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
CATALYSTS
CHEMICAL PREPARATION
MONTMORILLONITE
PHYSICAL PROPERTIES
STABILITY
ZIRCONIUM
ION EXCHANGE
ADSORPTION
CALCINATION
CATALYTIC CRACKING
DIFFUSION
DOPED MATERIALS
MICROSTRUCTURE
NITROGEN
PARTICLE SIZE
PETROLEUM FRACTIONS
PH VALUE
POROSITY
RARE EARTHS
SINTERING
SURFACE AREA
VISCOSITY
CHEMICAL REACTIONS
CLAYS
CRACKING
CRYSTAL STRUCTURE
DECOMPOSITION
ELEMENTS
ENERGY SOURCES
FABRICATION
FOSSIL FUELS
FUELS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MATERIALS
METALS
NONMETALS
PETROLEUM
PYROLYSIS
SIZE
SORPTION
SURFACE PROPERTIES
SYNTHESIS
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENTS
020400* - Petroleum- Processing