The synthesis of stable, hydrophobic MCM-48/VOx catalysts, using alkylchlorosilanes as coupling agents for the molecular designed dispersion of VO(acac)2

被引:12
作者
Van der Voort, P [1 ]
Vansant, EF [1 ]
机构
[1] Univ Instelling Antwerp, Lab Adsorpt & Catalysis, Dept Chem, B-2610 Wilrijk, Belgium
关键词
MCM materials; silylation; stable MCM catalysts; hydrothermal stability; leaching; V catalysts;
D O I
10.1016/S1387-1811(00)00166-9
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
The use of dimethyldichlorosilane as a coupling agent for the grafting of VOx structures on the MCM-48 surface produces a material that is simultaneously hydrophobic (immiscible with water) and very active (all V-centers are accessible, even for water molecules). These hydrophobic MCM-48 materials supported VOx catalysts are stable up to 500 degrees C and show a reduction in the leaching of the V-centers in aqueous media by a factor of 4. Also, the structural stability has improved significantly. The crystallinity of the silylated materials does not decrease significantly after a hydrothermal treatment in an autoclave at 160 degrees C. (C) 2000 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:385 / 390
页数:6
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