Synergetic Effect of K Sites and Pt Nanoclusters in
an Ordered Hierarchical Porous Pt-KMnOx/Ce0.25Zr0.75O2 Catalyst for Boosting
Soot Oxidation
Posted on 2020-06-17 - 13:40
We
have designed and elaborately fabricated the ordered hierarchical
macro-meso-microporous catalysts of Ce0.25Zr0.75O2-supported Pt-embedded KMnOx nanoparticles (OMMM Pt-KMnOx/Ce0.25Zr0.75O2). Three dimensionally ordered
macro-mesoporous (3DOMM) Ce0.25Zr0.75O2 oxide was synthesized by the combined methods of evaporation-induced
interfacial self-assembly (EISA) and colloidal crystal templates (CCT).
KMnOx nanoparticles (NPs) possess the
natural microporous nanostructure of an octahedral molecular sieve
(OMS) with an average size of 0.46 nm. Pt nanoclusters were anchored
in situ at the microporous structure of KMnOx NPs and formed Pt-KMnOx active
sites. For the OMMM Pt-KMnOx/Ce0.25Zr0.75O2 catalyst, a 3D ordered macroporous
(250 nm) structure can enhance contact efficiency between soot and
catalysts, and a high specific surface area with contributions from
ordered mesopores (5 nm) is beneficial for dispersion of KMnOx NPs and activation of gaseous reactants
(O2 and NO). Meanwhile, a microporous (0.46 nm) structure
can anchor K sites and ultrafine Pt nanoclusters. The synergetic effect
of ternary K-Mn-Pt components can transform gas reactants to the effective
intermediate species and thereafter oxidize the well-dispersed soot
particles. The OMMM Pt-KMnOx/Ce0.25Zr0.75O2 catalyst possesses high catalytic
activity and stability for soot oxidation under the conditions of
loose contact: i.e., its TOF value is 2.10 h–1 at
290 °C, which is more than a 4-fold increase over the 3DOMM Ce0.25Zr0.75O2 support (0.47 h–1). The architected hierarchical porous structure rationalizes an
alternative protocol to improve solid–solid contact and the
resulting activity, which can be further applied to other catalysis
systems with different catalysts and reactants.
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Xiong, Jing; Wei, Yuechang; Zhang, Yilin; Zhang, Peng; Yu, Qi; Mei, Xuelei; et al. (2020). Synergetic Effect of K Sites and Pt Nanoclusters in
an Ordered Hierarchical Porous Pt-KMnOx/Ce0.25Zr0.75O2 Catalyst for Boosting
Soot Oxidation. ACS Publications. Collection. https://doi.org/10.1021/acscatal.0c01911