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- W3396005 abstract "The ratios of silicon to aluminum at the maximum acidity which develops in mixtures of aluminum hydroxide and dimethylsilanediol, methylsilanetriol, and orthosilicic acid, indicate specific compounds of silicon and aluminum. On the basis of the observed ratios, a cyclic structure containing five silicons and one aluminum is suggested for silicaalumina composites formed in the relatively unstrained conditions existing in a dilute aqueous solution. Calcination results in the elimination of water by condensation of silicon hydroxyls to form a double-layer structure having active sites along its edge. The active sites are represented as three coordinated aluminas spaced in a double chain at distances of separation of approximately 5 A. Although a Bronsted acid may form on hydration of an active site, the Lewis acid represented as , is considered to be the active component of the catalyst. The exchange with the catalyst of isotopic oxygen from H2O18, and the exchange of D2O with hydrocarbons may be accounted for by the movement of H2O, acting as a cocatalyst, along the chains of active sites." @default.
- W3396005 created "2016-06-24" @default.
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- W3396005 date "1957-01-01" @default.
- W3396005 modified "2023-09-27" @default.
- W3396005 title "57 The Structure of Silica-Alumina Cracking Catalysts" @default.
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- W3396005 doi "https://doi.org/10.1016/s0360-0564(08)60207-2" @default.
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