Preparation of mesoporous solids by acid treatment of a porphyritic andesite (wheat-rice-stone)

in Sciences Citation Index(SCI), 科學引文索引資料庫(SCI)
標題Preparation of mesoporous solids by acid treatment of a porphyritic andesite (wheat-rice-stone)
出版類型SCI(Sciences Citation Index)
AuthorsWen-Tien Tsai, 蔡文田
出版日期2007 / 5

A porphyritic andesite, commonly called wheat–rice–stone, from the Coastal Range of Taiwan was activated with different H2SO4
concentrations (0.1 N–4.0 N) at temperature of 90 C and dosage of 10 g (andesite)/100 mL (water) for 0.5 h. The resulting solids were
characterized by nitrogen adsorption–desorption isotherms (at 196 C), scanning electron microscopy (SEM), X-ray powder diffraction
(XRD), Fourier transform infrared spectroscopy (FTIR), and elemental analysis by inductively coupled plasma-atomic emission spectrometer
(ICP-AES). It was found that the acid treatment method by sulfuric acid under the controlled conditions significantly etched to
proceed inwardly into the interior of the existing surface structure in the clay mineral, leaving a mesoporous structure possessing large
BET surface areas (over 60 m2/g), which are 20 times higher than that (i.e., 3.0 m2/g) of natural andesite. However, the increasing trend
in specific surface areas reached a plateau while the acid concentration was increased from 2.5 N to 3.5 N. Thereafter, the pore properties
were observed to decrease gradually at larger H2SO4 concentration, which was possibly attributed to the collapse or destruction of many
well-developed mesoporous walls within clay platelet due to the aggressive acid attack. This observation was illustrated by the examinations
on the SEM. These results were also explained in terms of chemical modifications of the mineral clay on treatment with the acid
according to the data on the XRD, FTIR and elemental analysis.

期刊名稱Microporous and Mesoporous Materials
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