Series
of Al-, Ga-, and Zr,Al-pillared clays (Al-MM, Ga-MM, and
Zr,Al-MM) were prepared through the intercalation of Al-, Ga-, and
Zr-polyoxocations into three layered aluminosilicates with various
textural properties and chemical compositions. Zr,Al-phases with the
structure of bayerite–boehmite were also synthesized using
Al and Zr oligomeric solutions, prepared from aluminum chloride and
zirconium oxychloride, respectively, as metal sources, with Zr/Al
ratios of 0–0.143. All materials were characterized by X-ray
diffraction; elemental analysis; DR-UV–vis, FTIR, and 27Al MAS NMR spectroscopies; and N2 adsorption/desorption
analysis. FTIR spectroscopy using pyridine, benzonitrile, and deuterated
chloroform as probe molecules was used to investigate the acid–base
properties of the solids. The catalytic performance of these materials
was investigated in the synthesis of 1-methoxy-2-propanol from methanol
and propylene oxide. It was found that the catalytic properties of
Zr,Al-pillared clays depended on the textural properties (pore diameter),
chemical composition (Si/Al molar ratio and Zr content), and type
of Al salt (nitrate or chloride) used as the Al source for the preparation
of the pillaring solution. The type of metal cation in the polyoxocations
affected the reaction rate and isomer selectivity. Al-MM was found
to exhibit a higher catalytic efficiency than Ga-MM and Zr-MM.
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