Hydrothermal synthesis and characterization of copper containing crystalline silicate mesoporous materials from gel mixture

被引：10

作者：

Chatterjee, M ^{[1
]}

Iwasaki, T ^{[1
]}

Onodera, Y ^{[1
]}

Hayashi, H ^{[1
]}

Ikushima, Y ^{[1
]}

Nagase, T ^{[1
]}

Ebina, T ^{[1
]}

机构：

[1] Natl Inst Adv Ind Sci & Technol, Supercrit Fluid Res Ctr, Miyagino Ku, Sendai, Miyagi 9838551, Japan

来源：

APPLIED CLAY SCIENCE | 2004年 / 25卷 / 3-4期

关键词：

Cu-SCMM; characterization; ESR; supercritical carbon dioxide; selective hydrogenation;

D O I：

10.1016/j.clay.2003.11.003

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Novel copper-containing crystalline silicate mesoporous materials (SCMM) have been synthesized by the hydrothermal treatment of slurries of silicon-magnesium-copper hydroxide precipitates along with quaternary ammonium salt. X-ray diffraction (XRD) and transmission electron microscopy (TEM) confirmed a house-of-cards type structure consists of very thin platy silicates. Nitrogen adsorption-desorption isotherms of calcined material show that it has a high surface area (similar to 550 m(2) g(-1)) and porosity properties. Pore characteristics are similar to that of MCM-41 and FSM-16, and fine-tuning of the pore size was achieved easily by modulating the synthesis temperature. Identification and the location of copper species in Cu-SCMM were done by X-ray photoelectron spectroscopy (XPS) and electron spin resonance (ESR), respectively. ESR data of air-dried Cu-SCMM consist of clearly defined g(\\) = 2.34, A(\\) = 140 x 10(-4) cm(-1) and g(perpendicular to) = 2.08 at room temperature and g(parallel to) = 2.34, A(parallel to) = 160 x 10(-4) cm(-1) and g(perpendicular to) = 2.10 at 77 K. The resulting material exhibited superior catalytic activity towards the hydrogenation of alpha-beta unsaturated aldehyde in supercritical carbon dioxide. (C) 2003 Elsevier B.V. All rights reserved.

引用

页码：195 / 205

页数：11

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