Relationship between the Surface Properties and the Catalytic Performance of Al-, Ga-, and AlGa-Pillared Saponites

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• 作者：Miguel Angel Vicente ; Carolina Belver ; Mikhail Sychev ; Roman Prihod’ ; ko ; Antonio Gil
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2009
• 出版时间：January 7, 2009
• 年：2009
• 卷：48
• 期：1
• 页码：406-414
• 全文大小：232K
• 年卷期：v.48,no.1(January 7, 2009)
• ISSN：1520-5045

文摘

A saponite from Ballarat, CA was intercalated with solutions containing only-Al, only-Ga, and two mixed AlGa-polycations, with various Al/Ga ratios. The pillared solids were obtained by calcination of the intercalated precursors at two temperatures, 300 and 500 °C. The physicochemical characteristics of the solids were studied by several techniques (XRD, N₂ adsorption at −196 °C, TG, DTA, FT-IR and UV−vis−NIR) and also by means of their behavior in various acid-catalyzed reactions. All the solids showed layered, ordered structure with basal spacings of ca. 18 Å and high specific surface areas between 247 and 387 m²/g (intercalated solids), 236 and 320 m²/g (calcined at 300 °C), and 201 and 331 m²/g (calcined at 500 °C). The materials were tested as catalysts in several reactions, including liquid-phase (rearrangement of α-pinene to camphene and methanol addition to 3,4-dihydropyran) and gas-phase processes (dehydration of the alcohols 2-methyl-3-butyn-2-ol and 2-propanol and cumene conversion). The catalytic behavior of the solids was discussed in terms of their surface properties and synthesis procedure.