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PREPARATION AND CHARACTERIZATION OF Ti-PILLARED CLAYS USING Ti ALKOXIDES. INFLUENCE OF THE SYNTHESIS PARAMETERS

Facultad de Ciencias Químicas, Departamento de Ingeniería Química, Universidad de Castilla-La Mancha, 13004 Ciudad Real, Spain

^* E-mail address of corresponding author: jlvalver{at}inqu-cr.uclm.es

Titanium was introduced into the clay structure by cation exchange with polymeric Ti cations which were formed by partial hydrolysis of Ti alkoxide in HCl. X-ray diffraction, N₂ adsorption-desorption, chemical analysis, thermogravimetric analysis, differential thermal analysis, temperature-programmed desorption of ammonia and temperature-programmed reduction were used to characterize the resulting Ti-pillared clays (Ti-PILCs). Titanium methoxide allows the synthesis of a solid with a large basal spacing (26 Å), a large surface area (360 m²/g), a significant amount of micropore surface area (90%), and notable acidity. Moreover, Ti-PILCs obtained from methoxide were found to be thermally stable up to 500°C. A correlation between the increase in acidity and the increases in both microporosity and Ti content was observed. The surface area, the micropore volume, the acidity and the d₀₀₁ peak intensity all increased upon increasing the amount of Ti added to the preparation (up to ~15 mmoles of Ti/g clay). The use of an aqueous suspension of 0.13 wt.% of clay yielded the best structural and textural properties in terms of subsequent use of the clay as a catalyst.

Key Words: Acidity • Basal Spacing • Pillared Clay • Synthesis • Titanium Alkoxides

This article has been cited by other articles:

				A. Romero, F. Dorado, I. Asencio, P. B. Garcia, and J. L. Valverde Ti-PILLARED CLAYS: SYNTHESIS AND GENERAL CHARACTERIZATION Clays and Clay Minerals, December 1, 2006; 54(6): 737 - 747. [Abstract] [Full Text] [PDF]

				J. L. Valverde, A. Romero, R. Romero, P. B. Garcia, M. L. Sanchez, and I. Asencio PREPARATION AND CHARACTERIZATION OF Fe-PILCS. INFLUENCE OF THE SYNTHESIS PARAMETERS Clays and Clay Minerals, December 1, 2005; 53(6): 613 - 621. [Abstract] [Full Text] [PDF]