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- W1986323306 abstract "A number of crystalline aluminosilicates have been shown to be versatile catalysts for the alkylation of aromatics and for related reactions. Highly acidic faujasites, including rare-earth-exchanged X and Y, and hydrogen Y from thermal decomposition of ammonium Y showed broadest application, although calcium and sodium X faujasites showed activity under certain conditions. Simple monocyclic aromatic nuclei such as benzene, phenol, and thiophene, with a wide variety of alkylating agents, were used, for the most part, in this study. For the strongly acidic faujasites, operation in the liquid phase at temperatures of 150–230°C was generally required for efficient alkylation of simple aromatics with a variety of olefins, alcohols, and haloalkanes, and for transethylation. For dealkylation reactions, alkylations with paraffins, and toluene disproportionation, higher temperatures were required. With low molecular weight alkylating agents such as ethylene, high molar ratios of aromatic to olefin were necessary to prevent catalyst aging. In typical alkylations of substituted benzenes, ortho:para orientation of substituents was observed. With alkylating agents of three or more carbon atoms, the monoalkylate generally consisted of a mixture of isomeric arylalkanes. Similarly, 2-substitution predominated in the alkylation of thiophene. Under comparable conditions, highly acidic faujasites catalyzed alkylation at lower temperatures than silica-alumina catalysts, but at higher temperatures than Lewis acids such as aluminum chloride and boron trifluoride, or protonic acids such as sulfuric or hydrofluoric acids." @default.
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- W1986323306 date "1966-02-01" @default.
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- W1986323306 title "Organic reactions catalyzed by crystalline aluminosilicatesI. Alkylation reactions" @default.
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- W1986323306 doi "https://doi.org/10.1016/s0021-9517(66)80128-8" @default.
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