Abstract
Nano silica was prepared from rice husk with high surface area. X-ray diffraction (XRD) pattern showed that the amorphous form of silica was produced. Chemical composition of the nano silica was estimated by X-ray fluorescence spectroscopy and CHN analysis. The nano silica was used as a support for H 3 PW 12 O 40 . The nano silica and nano silica supported H 3 PW 12 O 40 were characterized by inductively coupled plasma, XRD, transmission electron microscopy (TEM), N 2 adsorption-desorption, and Fourier transform infrared spectroscopy. TEM images of nano silica as well as the supported catalyst displayed average size of 6 and 7 nm, respectively. The catalyst showed excellent activity in some important organic reactions including Biginelli, Hantzsch, Mannich, and Claisen-Schmidt reactions with good reusability. Catalytic activity of this nano catalyst is an improvement over the commercially available silica that is used to support H 3 PW 12 O 40 . Nano silica was prepared from rice husk. Catalytic activity of H 3 PW 12 O 40 supported on nano silica was investigated in Biginelli, Hantzsch, Mannich, and Claisen-Schmidt reactions.
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