Abstract:

On the basis of preparing hollow silica sphere（HHSS） by hydrothermal method,CuO@HHSS composite catalysts were prepared with copper nitrate as raw material by ultrasonic assisted-impregnation method.The morphology and structure of the prepared catalyst were characterized by means of X-ray diffraction（XRD）,nitrogen adsorption and desorption,X-ray photoelectron spectroscopy（XPS）,scanning electron microscopy（SEM） and transmission electron microscopy（TEM） etc..Results showed that the CuO@HHSS catalyst still maintained the hierarchical nano hollow structure of HHSS.CuO particles were highly dispersed on the HHSS surface,which showed a high specific surface area（488.9 m²/g）.The catalytic reduction reaction of p-nitrophenol（4-NP） was used as a model reaction to investigate the catalytic performance of CuO and CuO@HHSS catalysts for reduction of 4-NP.The results revealed that CuO@HHSS had excellent catalytic performance at different 4-NP concentrations and catalyze NaBH₄ to convert 4-NP to p-aminophenol（4-AP） within 200 s.

Key words: CuO@HHSS, highly dispersed, high specific surface area, p-nitrophenol, catalytic reduction