Effective and Reusable Pt Catalysts Supported on Periodic Mesoporous Resols for Chiral Hydrogenation

Abstract

Platinum nanoparticles supported on periodic mesoporous resols by simple impregnation serve as effective, robust and remarkably reusable catalysts after chirally modified with cinchonidine for the asymmetric hydrogenation of ethyl pyruvate, affording up to 62% enantiomeric excess (ee) and a constant activity after 25th re-use. They can also catalyze the reaction in an environmentally benign manner by using water as a solvent.

Ru Nanoparticles Entrapped in Mesopolymers for Efficient Liquid-phase Hydrogenation of Unsaturated Compounds

“…As can be seen in Fig. 6, the benzaldehyde hydrogenation on the Ru/FDU-15-H 2 catalyst in water went faster than in ethanol, which is similar to our previous observations for the hydrogenation on the Pt catalysts and the key reasons have been elucidated [24,25]. Furthermore, the residual chloride ion of the ruthenium precursor RuCl 3 on the Ru/FDU-15 catalyst surface could be washed out by water so that the poison effect of the chloride ion diminished and thus the catalyst activity in water was enhanced.…”

“…5.0 wt% Ru/FDU-15 catalysts were prepared mainly according to Ref. [24]. FDU-15 was impregnated with an aqueous solution of RuCl 3 and stirred for 12 h. The excess water was removed under vacuum below 323 K, followed by a drying at 353 K overnight.…”

“…Since the discovery of FDU-type mesopolymers, extensive interests have been focused on their applications. The functionalization by loading platinum nanoparticles into the mesopores of FDU-type mesopolymers proved to be an efficient route for expanding their utilization in catalytic research field [24,25].…”

Funktionsmaterialien: von harten zu weichen porösen Netzwerken

“…Dennoch wurden solche Harze als Träger für Metalle und Metalloxide verwendet; für die erhaltenen Katalysatoren wurde eine hohe chemische und mechanische Stabilität beschrieben, und eine Auswaschung der metallischen Spezies wurde weitgehend verhindert. [111,112] Die Hydroxygruppen in den Phenolharzen könnten natürlich Zentren für eine weitere Funktionalisierung sein, jedoch wurden bisher vor allem die aromatischen Gruppen in den Harzen für diesen Zweck verwendet. So wurden funktionalisierte Phenolmonomere mit Formaldehyd unter Verwendung von Polymertemplaten zu mesoporösen Phenolharzen mit Carboxy-, Sulfonsäure-oder Aminfunktionen in den Porenwänden umgesetzt.…”

One-pot synthesis of highly ordered Ru-containing mesoporous polymers/silica for benzaldehyde hydrogenation

“…The highly hydrophobic FDU-type periodic mesopolymers, which can be derived from the organic-organic self-assembly of resol precursors (phenol/formaldehyde) with triblock copolymers and possess a three-dimensionally connected benzene ring framework [2], were proved effective supports for Pt and Ru nanoparticles in the hydrogenation of unsaturated compounds [3][4][5]. Organicinorganic nanocomposites take the advantages of organic polymers like flexibility, toughness, hydrophobicity and versatility for further functionalization, and of inorganic components such as excellent mechanical and thermal stability.…”