LRS-1: A New Delaminated Phyllosilicate Material with High Acidity
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- 作者：Bachar Zebib ; Jean-Franç ; ois Lambert ; Juliette Blanchard ; and Michè ; le Breysse
- 刊名：Chemistry of Materials
- 出版年：2006
- 出版时间：January 10, 2006
- 年：2006
- 卷：18
- 期：1
- 页码：34 - 40
- 全文大小：182K
- 年卷期：v.18,no.1(January 10, 2006)
- ISSN：1520-5002
文摘
Well-crystallized samples of the phyllosilicate magadiite have been synthesized in their sodic form,both purely silicic and with an Al/Si ratio of 30. They have been delaminated by a procedure consistingof CTMA+ swelling in the presence of TPAOH, sonication, and calcination at 700 
C to remove theorganics and characterized by XRD, 27Al, and 29Si NMR, IR, TEM, and SEM, and N2 physisorption afterthe successive steps of this procedure. The final delaminated solids, consisting of crumpled sheets, exhibita high (500-510 m2/g), mostly external surface area. While 29Si NMR indicated some loss of structuralorder, IR suggested the preservation of a typical feature of the magadiite sheets, namely, five-membered(TO4) rings. The acidity of the delaminated Al-containing material was evaluated by low-temperatureCO adsorption. This technique revealed strong Brönsted acidic centers, whose behavior was similar tothat of Si-OH-Al bridging hydroxyls in pentasil zeolites. Finally, the catalytic activity was evaluatedfor the test reaction of cumene cracking and shown to be much higher than that of a reference silicaalumina. These results make delaminated magadiite an attractive candidate for use as a novel acid catalystor catalytic support.
C to remove theorganics and characterized by XRD, 27Al, and 29Si NMR, IR, TEM, and SEM, and N2 physisorption afterthe successive steps of this procedure. The final delaminated solids, consisting of crumpled sheets, exhibita high (500-510 m2/g), mostly external surface area. While 29Si NMR indicated some loss of structuralorder, IR suggested the preservation of a typical feature of the magadiite sheets, namely, five-membered(TO4) rings. The acidity of the delaminated Al-containing material was evaluated by low-temperatureCO adsorption. This technique revealed strong Brönsted acidic centers, whose behavior was similar tothat of Si-OH-Al bridging hydroxyls in pentasil zeolites. Finally, the catalytic activity was evaluatedfor the test reaction of cumene cracking and shown to be much higher than that of a reference silicaalumina. These results make delaminated magadiite an attractive candidate for use as a novel acid catalystor catalytic support.