936 resultados para Aluminum ores.
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"October 1972."
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"June 1969."
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"December 1970."
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"September 1970."
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"October 1972."
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"Developed from a doctoral dissertation, Long-range forecasting of the demand for aluminum (University of Illinois, 1956)"
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Mode of access: Internet.
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Mode of access: Internet.
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""Union exhibit no. 3"--Cover.
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"Prepared by Syracuse Research Corporation under subcontract no. 12-60U-5766 to Research Triangle Institute under contract no. 205-93-0606."
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Recommends the use of paint made with Alcos Albron paste or powder.
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Bibliography: p. 349-355.
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Mode of access: Internet.
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"NIIC-0600-75-H006."
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A great deal of effort has been made at searching for alternative catalysts to replace conventional Lewis acid catalyst aluminum trichloride (AlCl3). In this paper, immobilization of AlCl3 on mesoporous MCM-41 silica with and without modification was carried out. The catalytic properties of the immobilized catalyst systems for liquid-phase isopropylation of naphthalene were studied and compared with those of H/MCM-41 and H/mordenite. The structures of the surface-immobilized aluminum chloride catalysts were studied and identified by using solid-state magic angle spinning nuclear magnetic resonance (MAS NMR), Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), nitrogen adsorption, and X-ray diffraction (XRD) techniques. The catalytic activity of the immobilized catalysts was found to be similar to that of acidic mordenite zeolite. A significant enhancement in the selectivity of 2,6-diisopropylnaphthalene (2,6-DIPN) was observed over the immobilized aluminum chloride catalysts. Immobilization of aluminum chloride on mesoporous silica coupled with surface silylation is a promising way of developing alternative catalyst system for liquid-phase Friedel-Crafts alkylation reactions. (C) 2002 Elsevier Science B.V. All rights reserved.