Abstract
The hollow CuO@SiO2 spheres with a mean diameter of 240 nm and a thin shell layer of about 30 nm in thickness was synthesized using an inorganic SiO2 shell coating on the surface of Cu@C composite that was prepared by a two-step hydrothermal method. The obtained hollow CuO@SiO2 spheres were characterized by ICP-AES, nitrogen adsorption-desorption, SEM, TEM, XRD, H2-TPR, CO-TPR, CO-TPD and NO-TPD. The results revealed that the hollow CuO@SiO2 spheres consist of CuO uniformly inserted into SiO2 layer. The CuO@SiO2 sample exhibits particular catalytic activities for CO oxidation and NO + CO reactions compared with CuO supported on SiO2 (CuO/SiO2). The higher catalytic activity is attributed to the special hollow shell structure that possesses much more highly dispersed CuO nanocluster that can be easy toward the CO and NO adsorption and the oxidation of CO on its surface.
Highlights
Preparation of Hollow CuO@SiO2 Spheres and Its Catalytic Performances for the NO 1 CO and CO Oxidation
The hollow CuO@SiO2 spheres with a mean diameter of 240 nm and a thin shell layer of about 30 nm in thickness was synthesized using an inorganic SiO2 shell coating on the surface of Cu@C composite that was prepared by a two-step hydrothermal method
We focused on the synthesis of Cu@C composites by two-step hydrothermal carbonization (HTC) method to obtain the much smaller nanoparticles and lower Cu amount than that of the one-step HTC method
Summary
Preparation of Hollow CuO@SiO2 Spheres and Its Catalytic Performances for the NO 1 CO and CO Oxidation. The hollow CuO@SiO2 spheres with a mean diameter of 240 nm and a thin shell layer of about 30 nm in thickness was synthesized using an inorganic SiO2 shell coating on the surface of Cu@C composite that was prepared by a two-step hydrothermal method. A wide variety of functional materials with SiO2 hollow structure can provide more opportunities for catalysis fields due to their intrinsic structural characteristics Considering their wide applications, many different methods have been adopted to synthesize hollow spheres containing transition metal[15,16,17]. The Cu@C composite spheres were prepared by a one-step hydrothermal carbonization (HTC) method and their use as sacrificial templates to synthesize a CuO@SiO2 structure[28]. It is necessary and interesting to explore the controllable synthesis of much smaller CuO@SiO2 nanoparticles with low Cu content in order to extend its application
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