A new approach for the preparation of well-defined Rh and Pt nanoparticles stabilized by phosphine-functionalized silica for selective hydrogenation reactions
作者:J. Llop Castelbou、K. C. Szeto、W. Barakat、N. Merle、C. Godard、M. Taoufik、C. Claver
DOI:10.1039/c6cc10338c
日期:——
A new methodology is reported for the synthesis of well defined silica-supported metallic nanoparticles that are selective hydrogenation catalysts.
Polymer versus phosphine stabilized Rh nanoparticles as components of supported catalysts: implication in the hydrogenation of cyclohexene model molecule
作者:M. Ibrahim、M. A. S. Garcia、L. L. R. Vono、M. Guerrero、P. Lecante、L. M. Rossi、K. Philippot
DOI:10.1039/c6dt03104h
日期:——
were compared using a model catalysis reaction namely, hydrogenation of cyclohexene, first under colloidal conditions and then under supported conditions after their immobilization onto an amino functionalized silica-coated magnetite support. PVP-stabilized Rh NPs were the most active catalyst whatever the catalytic conditions as a result of a strong coordination of the phosphine ligands at the metal
Rhodium nanoparticles stabilized by ferrocenyl-phosphine ligands: synthesis and catalytic styrene hydrogenation
作者:M. Ibrahim、M. M. Wei、E. Deydier、E. Manoury、R. Poli、P. Lecante、K. Philippot
DOI:10.1039/c9dt01006h
日期:——
from the organometallic [Rh(η3-C3H5)3] precursor. This complex has been decomposed by hydrogen treatment (3 bar) in dichloromethane in the presence of five different ferrocene-based phosphine ligands. Very small rhodium nanoparticles in the size range of 1.1–1.7 nm have been obtained. These nanoparticles have shown activity in a model catalytic reaction, namely the hydrogenation of styrene. These results
一系列二茂铁膦稳定化的纳米颗粒的铑已以一锅煮的制备从有机金属的[Rh(η 3 -C 3 H ^ 5)3]前体。在五种二茂铁基膦配体的存在下,通过在二氯甲烷中进行氢处理(3 bar),已将该配合物分解。已经获得了尺寸范围为1.1-1.7 nm的非常小的铑纳米粒子。这些纳米颗粒在模型催化反应(即苯乙烯的氢化)中显示出活性。这些结果证明,尽管有稳定的配体,但金属表面并未被封闭。此外,已经观察到一定的选择性,这取决于所用的配体。据我们所知,此类化合物尚未用于稳定金属纳米颗粒,我们的发现凸显了这样做的兴趣。
Supercritical carbon dioxide as reaction medium for selective hydrogenation of fluorinated arenes
pathway for the production of valuable substituted fluorocyclohexane derivatives from readily available substrates. The use of supercriticalcarbondioxide (scCO2) as a hydrophobic and green solvent in combination with Rh nanoparticles immobilized on molecularly modified silica as catalysts favours hydrogenation over hydrodefluorination. The approach compares favourably in terms of green chemistry metrics
A novel cascade of reactions is designed to control in situ the deposition of noblemetal islands (e.g. Rh) on top of nanoparticles of a 3d metal (e.g. Fe, Co).