tailieunhanh - Báo cáo vật lý: "Preparation of ZrO2/Al2O3-pillared Saponite and Its Spectroscopic Investigation on NOX Adsorption"

Tuyển tập các báo cáo nghiên cứu khoa học trên tạp chí khoa học vật lý quốc tế đề tài: Preparation of ZrO2/Al2O3-pillared Saponite and Its Spectroscopic Investigation on NOX Adsorption | Journal of Physical Science Vol. 21 1 53-65 2010 53 Preparation of ZrO2 Al2O3-pillared Saponite and Its Spectroscopic Investigation on NOX Adsorption Is Fatimah1 Karna Wijaya2 and Narsito2 1Chemistry Department Islamic University of Indonesia Kampus Terpadu UII Jl. Kaliurang Km. 14 Yogyakarta Indonesia 2Chemistry Department Gadjah Mada University Sekip Utara Yogyakarta Corresponding author isfatimah@ Abstract Zirconia alumina ZrO2 Al2O3 -pillared saponite was prepared by the impregnation method using zirconium oxide chloride solution as a precursor. The effect of zirconia concentration on the physicochemical properties was studied with X-ray diffraction XRD surface area analysis and scanning electron microscopy SEM . Its surface activity with respect to the change in physical properties was quantified by spectroscopic investigation of the adsorption of nitrogen oxide NOfi. Significant differences were found in the material textural parameters with increasing zirconium Zr content decreasing specific surface area and the formation of the monoclinic zirconia phase. It was found that zirconia dispersion contributed to the enhanced NOx adsorption. Keywords clay pillarisation zirconia dispersion adsorption 1. INTRODUCTION Pillared clays are semi-synthesised materials characterised as zeolite-like materials. The basic principle of preparation is exchanging charge compensating ions in the interlayer space of clay structures with the oligocation of hydrolysed metal followed by a calcination process to form a stable metal oxide. Due to its mechanism in the formation of pillars pillared clays are porous materials that have high specific surface areas and exchangeable cations in pores. This property leads to their use as catalysts and solid supports of catalysts. Some investigations on pillared clay synthesis and applications for several chemical reactions have been reported1-3. Recent advances in clay modification include the use of pillared clays as solid .