Carbon nanotubes and xerogels as supports of well-dispersed Pt catalysts for environmental applications

A c c e p t e d M a n u s c r i p t Research highlights The chiral catalyst RhDuphos has been anchored on carbon nanotubes and xerogels.  Non covalent anchoring strategies were used: electrostatic and - interactions.  Supports have been chemically modified to promote desired interactions.  RhDuphos on an oxidized carbon xerogel is active, enantioselective and reusable. The immobilization of the chiral complex RhDuphos, by electrostatic or π-π (adsorption) interactions, on carbon nanotubes and carbon xerogels is investigated. To promote such interactions, the supports were either oxidized or heat treated to create carboxylic type surface groups or an apolar surface, respectively. The catalysts were tested in the hydrogenation of methyl 2-acetamidoacrylate.The prepared hybrid catalysts are less active than the homogeneous RhDuphos, but most of them show a high enantioselectivity and the one prepared with the oxidized carbon xerogel is also reusable, being able to give a high substrate conversion, keeping as well a high enantioselectivity. The anchorage by electrostatic interactions is more interesting than the anchorage by - interactions, as the π-π adsorption method produces a modification of the metal complex structure leading to an active hybrid catalyst but without enantioselectivity.The creation of carboxylic groups on the support surface has led to some hindering of the complex leaching.

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“…This confirms the lower reactivity of the carbon nanotubes, previously reported by Gomes et al [25].…”

Section: Surface Chemistrysupporting

confidence: 80%

Non-covalent immobilization of RhDuphos on carbon nanotubes and carbon xerogels

Gheorghiu

Lecea

Román-Martı́nez

2014

Applied Catalysis A: General

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“…Those properties have been thoroughly studied by our group in order to produce suitable catalytic materials for a wide range of specific applications, in particular activated carbons, carbon xerogels and carbon nanotubes for catalytic wet air oxidation [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Activated carbons treated with sulphuric acid: Catalysts for catalytic wet peroxide oxidation

et al. 2010

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“…MWCNTs have electronic properties similar to those of graphite and are thus semimetals. They are promising for multiple applications including strong composite materials, field emission displays, and adsorbents for gas separation or storage [40][41][42][43][44][45][46][47]. Similar to SWCNTs, a continuous low-cost production method producing MWCNTs that are easily purified is required for MWCNTs to be incorporated in emerging technologies.…”

Section: Synthesis Of Mwcntsmentioning

confidence: 99%