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Ultra-high surface area silica, UHSAS (N2 BET surface area:>700m2g−1) was obtained from expanded perlite (EP) by a two-step process. In the first step, a hydrothermal process using aqueous sodium hydroxide (at 70°C for 24h) was employed to convert EP into an ordered intermediate zeolitic phase. The materials and the process dynamics were examined by various analytical techniques to elucidate the...
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