Results 181 to 190 of about 56,130 (232)
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Non-aggressive pillaring of clays with zirconium acetate. Comparison with alumina pillared clays
Applied Catalysis A: General, 1999Abstract A non-aggressive method of intercalation of smectitic clays with zirconium oligomers from the hydrolysis of a commercial solution of zirconium acetate is presented. Two saponites and a montmorillonite have been selected as the starting materials.
A Gil, M A Vicente, L M Gandı́A
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Solid State Ionics, 1988
The interest in the petroleum industry in converting heavier feeds to liquid fuels has led to a search for microporous materials with pore sizes larger than those found in the faujasitic zeolites which form the basis of many petroleum processing catalysts.
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The interest in the petroleum industry in converting heavier feeds to liquid fuels has led to a search for microporous materials with pore sizes larger than those found in the faujasitic zeolites which form the basis of many petroleum processing catalysts.
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Decomposition of nitrous oxide on pillared clays
Chemosphere, 2000Alumina-pillared smectites have been found to abate nitrous oxide in the presence of methane. The results indicate that the yield of the reaction (N20 --> N2 + (1/2)O2) increases when pillared clays are exchanged with transition metals, single-pass conversion rates of >70% being attainable. In particular, when double exchanged (calcium and subsequently
A, De Stefanis +3 more
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2008
Zirconia pillared clays were prepared by intercalation of natural montmorillonite and natural saponites with zirconium polyoxo cations (prepared either by partial hydrolysis of zirconyl chloride or from zirconium acetate solution), followed by calcination. The use of the Zr acetate solution is a much less aggressive method.
M. A. Vicente, A. Gil
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Zirconia pillared clays were prepared by intercalation of natural montmorillonite and natural saponites with zirconium polyoxo cations (prepared either by partial hydrolysis of zirconyl chloride or from zirconium acetate solution), followed by calcination. The use of the Zr acetate solution is a much less aggressive method.
M. A. Vicente, A. Gil
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Realisation of truly microporous pillared clays
Chem. Commun., 2008When pillaring a well crystalline synthetic hectorite using molecular pillars, we obtained a truly microporous material for the first time that displays long range order of the pillars and consequently a narrow pore size distribution.
Melanie, Stöcker +4 more
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The Reactions in Clays and Pillared Clays
1986This article reviews the extraordinary variety of organic chemical processes which can be catalysed heterogeneously by clay materials.
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Pillared laponite clays-supported palladium catalysts for the complete oxidation of benzene
Journal of Molecular Catalysis A, 2005 Zr-, Ce-, and Al-pillared laponite clays (Al-Lap, Ce-Lap, Zr-Lap) were prepared and used as supports of palladium catalysts for the complete oxidation of benzene.
Hao, Zhengping +4 more
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Chemistry of Materials, 2003
The stability of alumina-pillared montmorillonite clays, prepared at various Al/clay ratios, was investigated by compaction at various pressures. The physical properties of the pillared clays, before and after compaction, were studied by powder XRD and nitrogen sorption.
Mark Pichowicz, Robert Mokaya
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The stability of alumina-pillared montmorillonite clays, prepared at various Al/clay ratios, was investigated by compaction at various pressures. The physical properties of the pillared clays, before and after compaction, were studied by powder XRD and nitrogen sorption.
Mark Pichowicz, Robert Mokaya
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Mixed metal pillared clays and their pillaring precursor
Journal of the Chemical Society, Faraday Transactions, 1998Mixed-metal pillared layer clays (Fe,Al-PILCs and Cr,Al-PILCs) of various compositions and the pillaring precursors have been prepared and characterised with a combination of chemical and instrumental methods. Chemical analysis data, IR, 57 Mössbauer and 27 Al NMR spectroscopic measurements on the precipitated pillaring precursors and comparison of ...
Pálinkó, István +6 more
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Reactivity of Anisoles on Clay and Pillared Clay Surfaces
Clays and Clay Minerals, 1990AbstractPillared bentonites were found to be efficient catalysts for the O-methyl bond cleavage of anisoles (e.g., m-methylanisole, guaiacol, and creosol) under very mild, static conditions (150°C, a few hours, inert atmosphere). The O-methyl bond cleavage led to phenolic products.
Kathleen A. Carrado +3 more
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