Mesoporous Silica-Pillared H⁺-Kenyaite with Highly Ordered Gallery Structure

Authors: Park, Kyeong-Won; Jung, Jong Hwa; Jeong, Soon-Young; Kwon, Oh-Yun

Source: Journal of Nanoscience and Nanotechnology, Volume 9, Number 5, May 2009 , pp. 3160-3165(6)

Publisher: American Scientific Publishers

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Abstract:

Mesoporous silica-pillared H⁺-kenyaite (SPK) derivatives with highly ordered gallery structure and thermal resistance were prepared by the hydrolysis of TEOS (tetraethylorthosilicate) in interlayer space, using DDA (dodecylamine) as catalyst and template. DDA-TEOS/H⁺-kenyaite intercalation compounds were obtained by the dispersion of H⁺-kenyaite in DDA-TEOS solution. DDA-TEOS/H⁺-kenyaites were hydrolyzed rapidly in pure water, forming siloxane pillared H⁺-kenyaites. Calcination of siloxane pillared H⁺-kenyaites for 5 h at 600 °C in air resulted in mesoporous SPK derivatives. These exhibited refractions corresponding to a basal spacing of 5.0-5.5 nm, a uniform pore size of 2.5-3.0 nm and large surface areas between 707 and 877 m²/g. TEM images confirmed that SPK had uniform interlayer spaces of 2.0-3.0 nm in agreement with the gallery height and pore size data. The structure and physical properties of SPK remained stable after heating for 5 h at 800 °C in air. This is attributed to the stable structure of kenyaite composed of 4-fold SiO₄ tetrahedral sheets, and the formation of firm silica pillars.

Keywords: KENYAITE; SILICA-PILLARING; INTERCALATION; TEMPLATE; LAYERED SILICATE

Document Type: Research article

DOI: http://dx.doi.org/10.1166/jnn.2009.016

Publication date: 2009-05-01

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