Nanoscale Pt(0) particles prepared in imidazolium room temperature ionic liquids: synthesis from an organometallic precursor, characterization, and catalytic properties in hydrogenation reactions.
Nanoscale Pt(0) particles prepared in imidazolium room temperature ionic liquids: synthesis from an organometallic precursor, characterization, and catalytic properties in hydrogenation reactions.
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DOI：
10.1021/ic034453r
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发表时间：
2003-06
影响因子：
4.6
通讯作者：
C. Scheeren;G. Machado;J. Dupont;P. Fichtner;S. Texeira
中科院分区：
文献类型：
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作者：
C. Scheeren;G. Machado;J. Dupont;P. Fichtner;S. Texeira
铂(2)(Dba)(3)(dba=二亚甲基丙酮)在室温下分散于1-正丁基-3-甲基咪唑(BMI)六氟磷酸盐离子液体中，在75℃与分子氢(4atm)反应生成稳定的、可分离的纳米铂(0)粒子。X-射线衍射分析表明，该材料由铂(0)相组成。对分散在离子液体中的粒子进行了透射电子显微镜分析，结果表明形成了直径为2.0-2.5 nm的[Pt(0)](N)纳米粒子。对吸附在离子液体中的纳米粒子及其环境的详细检查表明，BMI.PF(6)离子液体与铂(0)纳米粒子存在相互作用。分离的[铂(0)](N)纳米粒子可以重新分散在离子液体或丙酮中，或者在温和的反应条件下(75℃和4atm)用于烯烃和芳烃的液-液两相、均相或多相加氢反应。回收的铂纳米颗粒可以作为固体重复使用，或在离子液体中多次重新分散，而不会造成任何明显的催化活性损失。
The reaction of Pt(2)(dba)(3) (dba = bis-dibenzylidene acetone) dispersed in room temperature 1-n-butyl-3-methylimidazolium (BMI) hexafluorophosphate ionic liquid with molecular hydrogen (4 atm) at 75 degrees C leads to stable and isolable nanometric Pt(0) particles. The X-ray diffraction analysis (XRD) of the material indicated that it is constituted of Pt(0). Transmission electron microscopy (TEM) analysis of the particles dispersed in the ionic liquid shows the formation of [Pt(0)](n) nanoparticles of 2.0-2.5 nm in diameter. A detailed examination of the nanoparticles imbibed in the ionic liquid and their environment shows an interaction of the BMI.PF(6) ionic liquid with the Pt(0) nanoparticles. The isolated [Pt(0)](n) nanoparticles can be redispersed in the ionic liquid or in acetone or used in solventless conditions for liquid-liquid biphasic, homogeneous, or heterogeneous hydrogenation of alkenes and arenes under mild reaction conditions (75 degrees C and 4 atm). The recovered platinum nanoparticles can be reused as a solid or redispersed in the ionic liquid several times without any significant loss in catalytic activity.