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Generation of Acidity of Silica Monolayer By Network of Si-O-Si On Alumina

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Structures of materials deposited from various Si alkoxides on alumina were determined based on gravimetry, product analysis and coverage measurement. The activity for double-bond isomerization of 1-butene was observed over the silica monolayer with a network of siloxanes (Si-O-Si) deposited from Si(OCH3)4 at 493 and 593 K. However, the isolated silica species deposited from Si(OCH3)4 at low temperatures ( 423 K) and those deposited from Si(OCH3)n(CH3)4-n (n 3) showed almost no activity. Based on these findings, the species- Al-O-SiOH in the network of Si-O-Si was suggested to be the Brønsted acid site.

Affiliations: 1: Department of Materials Science, Faculty of Engineering, Tottori University, Koyama-cho, Tottori 680, Japan; 2: Department of Applied Chemistry, School of Engineering, Nagoya University, Chikusa-ku, Nagoya 464-01, Japan


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