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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Nat+Commun
2017 ; 8
(ä): 15553
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English Wikipedia
The controlled disassembly of mesostructured perovskites as an avenue to
fabricating high performance nanohybrid catalysts
#MMPMID28541308
Wang Y
; Arandiyan H
; Tahini HA
; Scott J
; Tan X
; Dai H
; Gale JD
; Rohl AL
; Smith SC
; Amal R
Nat Commun
2017[May]; 8
(ä): 15553
PMID28541308
show ga
Versatile superstructures composed of nanoparticles have recently been prepared
using various disassembly methods. However, little information is known on how
the structural disassembly influences the catalytic performance of the materials.
Here we show how the disassembly of an ordered porous La(0.6)Sr(0.4)MnO(3)
perovskite array, to give hexapod mesostructured nanoparticles, exposes a new
crystal facet which is more active for catalytic methane combustion. On
fragmenting three-dimensionally ordered macroporous (3DOM) structures in a
controlled manner, via a process that has been likened to retrosynthesis,
hexapod-shaped building blocks can be harvested which possess a mesostructured
architecture. The hexapod-shaped perovskite catalyst exhibits excellent low
temperature methane oxidation activity (T(90%)=438?°C; reaction rate=4.84 ×
10(-7)?mol?m(-2)?s(-1)). First principle calculations suggest the fractures,
which occur at weak joints within the 3DOM architecture, afford a large area of
(001) surface that displays a reduced energy barrier for hydrogen abstraction,
thereby facilitating methane oxidation.