Acidic Amorphous Silica Prepared from Iron Oxide of Bacterial Origin
Acidic Amorphous Silica Prepared from Iron Oxide of Bacterial Origin
复制标题
由细菌来源的氧化铁制备的酸性无定形二氧化硅
DOI：
10.1021/am302837p
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发表时间：
2013
影响因子：
9.5
通讯作者：
and J. Takada
中科院分区：
文献类型：
--
作者：
H. Hashimoto;A. Itadani;T. Kudoh;Y. Kuroda;M. Seno;Y. Kusano;Y. Ikeda;M. Nakanishi;T. Fujii;and J. Takada
由生物氧化铁衍生的微孔和介孔二氧化硅是各种有机反应的有吸引力的催化剂。生物生成的氧化铁中含有结构硅，氧化铁溶解于浓盐酸中后仍有无定形二氧化硅存在。含有微量铁（Si/Fe = 150）的无定形二氧化硅由直径为1.6nm的粒状颗粒组成。无定形二氧化硅具有540 m2/g的大表面积，具有微孔（1.4 nm）和中孔（<3 nm）。用吡啶蒸气作为探针分子对无定形二氧化硅中的活性中心进行了评价，发现该材料具有强的布朗斯特酸中心和刘易斯酸中心。当对包括环氧化物的开环和Friedel-Crafts型烷基化的反应（已知其由酸催化剂催化）评价该材料的催化性能时，该材料显示出比用普通二氧化硅材料获得的那些更高的产率。
Microporous and mesoporous silica derived from biogenous iron oxide is an attractive catalyst for various organic reactions. Biogenous iron oxide contains structural silicon, and amorphous silica remains after iron oxide is dissolved in concentrated hydrochloric acid. The amorphous silica containing slight amounts of iron (Si/Fe = ∼150) is composed of ∼6-nm-diameter granular particles. The amorphous silica has a large surface area of 540 m2/g with micropores (1.4 nm) and mesopores (<3 nm). By using pyridine vapor as a probe molecule to evaluate the active sites in the amorphous silica, it was found that this material has strong Brønsted and Lewis acid sites. When the catalytic performance of this material was evaluated for reactions including the ring opening of epoxides and Friedel–Crafts-type alkylations, which are known to be catalyzed by acid catalysts, this material showed yields higher than those obtained with common silica materials.