Preparation, Characterization and Catalytic Activity for CO Oxidation of SiO 2 Hollow Spheres Supporting CuO Catalysts
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Preparation, Characterization and Catalytic Activity for CO Oxidation of SiO2 Hollow Spheres Supporting CuO Catalysts Chunyan Song Æ Chunling Wang Æ Haiyang Zhu Æ Xingcai Wu Æ Lin Dong Æ Yi Chen
Received: 1 August 2007 / Accepted: 29 August 2007 / Published online: 21 September 2007 Ó Springer Science+Business Media, LLC 2007
Abstract Silica hollow spheres were synthesized by sol– gel process using carbon microspheres as templates, and used as supports for CuO/SiO2 catalysts. The samples were characterized by TEM, nitrogen adsorption–desorption, XRD and TPR, and furthermore, the catalytic performance for CO oxidation was approached. The results indicated that the catalytic activity of CuO supported on SiO2 hollow spheres exhibited much higher as compared to that supported on commercial SiO2. Enhancement of the catalytic activity may be attributed to the fact that the unique hollow spherical texture should facilitate the formation of main active species and gas diffusion in catalysts. Keywords Hollow spheres CuO/SiO2 CO oxidation Catalytic activity
1 Introduction Hollow spheres have increasingly attracted interest due to their unique properties and potential applications in chemistry, biotechnology, and materials science [1–3]. Inorganic materials with hollow spherical structure have exhibited excellent properties in many aspects such as magnetic, optical [4–6] and electric properties [7, 8].
C. Song C. Wang H. Zhu X. Wu (&) L. Dong (&) Y. Chen Key Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, P.R. China e-mail: [email protected] L. Dong e-mail: [email protected]
However, little attentions have been paid to the research on catalytic properties of hollow spheres in the past years. Recently, the hollow spheres as catalysts have been applied to several liquid phase reactions [9–11]. For example, the PdCo bimetallic hollow spheres were successfully applied to catalysis of the Sonogashira Reaction [12]. In recent years, the CO catalytic oxidation has become an important research topic because of its various applications in pollution control devices for vehicle exhaust, CO gas sensors, and catalytic combustion, and so on [13–15]. Copper-contained catalysts show a potential activity for the CO oxidation and have been extensively investigated during the past decades [16–18]. It is well known that SiO2 is a good catalyst support and the performance of catalysts has a close relationship with the properties of supports [19–23]. Therefore, silica with hollow spherical structure was selected as supports of copper oxide (CuO) in present work, in order to study the influence of morphology of supports on catalytic activity. Herein we used carbon spheres as templates [24] to fabricate silica hollow spheres by a succinct sol–gel path and researched the catalytic performance for CO + O2 reaction. The results indicated that catalytic activity of CuO supported on SiO2 hollow spheres exhibited much higher as compared to that supported on
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