TAILIEUCHUNG - Báo cáo " Study on the characteristics and catalytic properties of Pt/SBA-15 in the selective oxidation of D-Glucose "

In this work, platinum nanoparticles were dispersed on SBA-15 mesoporous material by incipient wetness method and the synthesized materials were characterized by XRD, TEM, EDX spectroscopies and N2 adsorption-desorption isotherm measurement. The results indicated that 2D hexagonal ordered structure of SBA-15 was still maintained after grafting Pt on SBA-15 support and platinum nanoparticles existed both inside and outside the pore channels of SBA-15 material. Catalytic activity of these materials was tested in the aqueous phase D-glucose oxidation as a model reaction. . | VNU Journal of Science Natural Sciences and Technology 26 2010 183-190 Study on the characteristics and catalytic properties of Pt SBA-15 in the selective oxidation of D-Glucose Tran Thi Nhu Mai Nguyen Thi Minh Thu Pham Dinh Trong Nguyen Thi Ha Giang Thi Phuong Ly Faculty of Chemistry Hanoi University of Science VNU 334 Nguyen Trai Hanoi Vietnam Received 5 May 2010 Abstract. In this work platinum nanoparticles were dispersed on SBA-15 mesoporous material by incipient wetness method and the synthesized materials were characterized by XRD TEM EDX spectroscopies and N2 adsorption-desorption isotherm measurement. The results indicated that 2D hexagonal ordered structure of SBA-15 was still maintained after grafting Pt on SBA-15 support and platinum nanoparticles existed both inside and outside the pore channels of SBA-15 material. Catalytic activity of these materials was tested in the aqueous phase D-glucose oxidation as a model reaction. The reaction was carried out in a glass reactor at atmospheric pressure 80oC air flow rate 20ml minute at pH 9. The results from HPLC-RID method showed that the pH has a profound effect in the platinum-catalyzed oxidation of glucose and high conversion of D-glucose with the highest selectivity to D-gluconic acid was performed with 1 Pt SBA-15 catalyst. 1. Introduction Gluconic acid and its salts are important industrial products they are used as watersoluble cleansing agents or additives in foods and beverages. For commerical purposes these products are exlusively prepared by the oxidation of glucose or glucose-containing raw materials. Althrough the currently used oxidation method is based on biochemical tranformation but recent development has indicated that the catalytic route may be valid alternative for producing gluconate on an industrial scale. For this reason many interested reseachs in order to discover the active catalyst for this process have been taken out. In this paper Pt SBA-15 materials with various Pt loading on high

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