منابع مشابه
Nanocrystalline Thin Films as a Model System for Sulfated Zirconia
Introduction and Strategy Discovery of the extraordinary activity of sulfated zirconia for n-butane isomerization below 373K has led to numerous efforts to investigate and correlate structure, acidity, and reactivity of this material. Although a large data set has been obtained from powdered sulfated zirconia no consistent picture has evolved that satisfactorily describes acidity and reactivity...
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It is now well established that even though Pd supported on acidic zeolites is highly selective for CH4-SCR, zeolitic structures are susceptible to dealumination under hydrothermal environments. In this contribution, we have investigated the ability of non-zeolitic acidic materials to promote the SCR selectivity and stability in the presence of H2O and SO2. The results of catalytic activity mea...
متن کاملIonic liquid-templated preparation of mesoporous silica embedded with nanocrystalline sulfated zirconia
A series of mesoporous silicas impregnated with nanocrystalline sulphated zirconia was prepared by a sol-gel process using an ionic liquid-templated route. The physicochemical properties of the mesoporous sulphated zirconia materials were studied using characterisation techniques such as inductively coupled optical emission spectroscopy, X-ray diffraction, transmission electron microscopy, ener...
متن کاملAdsorption–desorption equilibrium investigations of n-butane on nanocrystalline sulfated zirconia thin films
Nanocrystalline thin films of the alkane skeletal isomerisation catalyst sulfated zirconia were successfully deposited on a silicon substrate in order to allow the application of surface science techniques. Thermal treatment of the films was optimised to chemically mimic the powder preparation process, resulting in films possessing the essential features (including tetragonal phase, nanocrystal...
متن کاملHydrothermally Stable, Conformal, Sulfated Zirconia Monolayer Catalysts for Glucose Conversion to 5-HMF
The grafting and sulfation of zirconia conformal monolayers on SBA-15 to create mesoporous catalysts of tunable solid acid/base character is reported. Conformal zirconia and sulfated zirconia (SZ) materials exhibit both Brönsted and Lewis acidity, with the Brönsted/Lewis acid ratio increasing with film thickness and sulfate content. Grafted zirconia films also exhibit amphoteric character, whos...
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ژورنال
عنوان ژورنال: Synlett
سال: 2005
ISSN: 0936-5214,1437-2096
DOI: 10.1055/s-2004-837228