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POSS‐Based Nitrogen‐Doped Hierarchically Porous Carbon as Metal‐Free Oxidation Catalyst
Author(s) -
Wang Dengxu,
Mejía Esteban
Publication year - 2017
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201700627
Subject(s) - silsesquioxane , mesoporous material , materials science , catalysis , porosity , bet theory , pyrolysis , chemical engineering , carbon fibers , metal , specific surface area , nitrogen , polymer chemistry , polymer , chemistry , organic chemistry , composite material , composite number , metallurgy , engineering
Carbon materials have emerged in recent years as alternative metal‐free catalysts for various reactions. Pyrolysis of polyhedral oligomeric silsesquioxane (POSS)‐based hybrid porous polymers (HPP), results in nitrogen‐doped hierarchically porous carbons (N‐HPC). HPP is easily synthesized from octaphenyl‐POSS and 2,4,6‐trichloro‐1,3,5‐triazine via Friedel‐Crafts reaction and exhibits high porosity with BET surface area ( S BET ) of 1071 m 2 /g and pore volume of 0.99 cm 3 /g. Remarkably, HPP acts as a “dual template” after pyrolysis, bestowing the materials simultaneously with enhanced micro‐ and meso‐porosity. After silica etching, N‐HPC materials possess a hierarchically micro‐ and mesoporous structure with S BET of up to 1536 m 2 /g and pore volume of 1.00 cm 3 /g. Moreover, N‐HPC show to be catalytically active in the oxidative coupling of amines to imines using oxygen (1 bar) as the primary oxidant under neat conditions. The remarkable O 2 ‐activation ability of these novel metal‐free materials could be certainly expanded to other transformations.