Modification of Sn-Beta zeolite: characterization of acidic/basic properties and catalytic performance in Baeyer-Villiger oxidation

Otomo Ryoichi; Kosugi Ryota; Kamiya YuichiTatsumi TakashiYokoi Toshiyuki

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Modification of Sn-Beta zeolite: characterization of acidic/basic properties and catalytic performance in Baeyer-Villiger oxidation

机译：修改Sn-Beta沸石:表征酸性/基本性质和催化表现Baeyer-Villiger氧化

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Sn-Beta was post-synthetically modified with various cations such as Li+, Na+, K+, Cs+, and NH4+. During the modification process, the ion-exchange of the cations with silanol groups occurred along with a reversible change between "closed" and "open" Sn sites through hydrolysis of the Si-O-Sn bonds. The IR study showed that Sn-Beta had weak Bronsted acid sites, which were passivated by the ion-exchange, in addition to the Lewis acid sites and that surprisingly, basic sites were formed on the modified zeolites. The ion-exchange with a small amount of Li+, Na+ and NH4+ was effective for suppressing side-reactions, leading to an improvement in selectivity to caprolactone in the Baeyer-Villiger oxidation of cyclohexanone with H2O2. The modification of Sn-Beta with such cations also effectively enhanced the catalytic activity in the Baeyer-Villiger oxidation of 2-adamantanone.

机译：Sn-Beta post-synthetically修改各种阳离子如李+,Na +, K + c +NH4 +。离子交换的阳离子硅醇组发生之间的可逆变化“封闭”与“开放”Sn网站通过水解Si-O-Sn债券。Sn-Beta已经疲软的布仑斯惕酸网站,钝化的离子交换,除了路易斯酸网站,令人惊讶的是,基本的网站上形成修改后的沸石。离子交换与少量的李+,Na +和NH4 +被有效抑制副反应,导致的改善己内酯的选择性Baeyer-Villiger氧化环己酮过氧化氢。阳离子也有效地提高了催化活动的Baeyer-Villiger氧化2-adamantanone。

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来源
《Catalysis science & technology》 |2016年第8期|2787-2795|共9页
作者
Otomo Ryoichi; Kosugi Ryota; Kamiya YuichiTatsumi TakashiYokoi Toshiyuki;
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作者单位

Tokyo Inst Technol, Chem Resources Lab, Midori Ku, 4259 Nagatsuta, Yokohama, Kanagawa 2268503, Japan;

Hokkaido Univ, Fac Environm Earth Sci, Kita Ku, Nishi 5,Kita 10, Sapporo, Hokkaido 0600810, Japan;

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正文语种英语
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关键词
MODIFICATION; reversible change; ammoniumBaeyer-Villiger oxidationLewis acidscyclohexanoneZeolitesBronsted acidsCations;

机译：修改;可逆变化;ammoniumBaeyer-Villiger oxidationLewis;

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Modification of Sn-Beta zeolite: characterization of acidic/basic properties and catalytic performance in Baeyer-Villiger oxidation

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