Developing
single-atom catalysts with porous micro-/nanostructures
for high active-site accessibility is of great significance but still
remains a challenge. Herein, we for the first time report a novel
template-free preassembly strategy to fabricate porous hollow
graphitic carbonitride spheres with single Cu atoms mounted
via thermal polymerization of supramolecular preassemblies
composed of a melamine–Cu complex and cyanuric acid. Atomically
dispersed Cu–N3 moieties were unambiguously confirmed
by spherical aberration correction electron microscopy and extended
X-ray absorption fine structure spectroscopy. More importantly, this
material exhibits outstanding catalytic performance for selective
oxidation of benzene to phenol at room temperature, especially showing
phenol selectivity (90.6 vs 64.2%) and stability much higher than
those of the supported Cu nanoparticles alone, originating from the
isolated unique Cu–N3 sites in the porous hollow
structure. An 86% conversion of benzene, with an unexpectedly high
phenol selectivity of 96.7% at 60 °C for 12 h, has been achieved,
suggesting a great potential for practical applications. This work
paves a new way to fabricate a variety of single-atom catalysts with
diverse graphitic carbonitride architectures.
Spinel ferrites are considered as practical and promising oxygen evolution reaction (OER) and urea oxidation reaction (UOR) electrocatalysts because of their advantages in adsorption and activation of electrocatalytic substances. CeO2...
This work reports a facile strategy for preparing a highly efficient capsule bifunctional catalyst by direct coating copper–zinc–aluminum oxalate with H-ZSM-5, showing outstanding catalytic properties for dimethyl ether production from syngas.
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