Catalysts of 3D ordered macroporous ZrO2-supported core–shell Pt@CeO2−x nanoparticles: effect of the optimized Pt–CeO2 interface on improving the catalytic activity and stability of soot oxidation

Li, Yazhao; Du, Yuhao; Wei, Yuechang; Zhang, Zhao; Jin, Baofang; Zhang, Xindong; Liu, Jian

doi:10.1039/c6cy02441f

Cited by 30 publications

(14 citation statements)

References 49 publications

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“…Broad peaks are observed at temperatures less than 120–190 °C, corresponding to the surface active oxygen (O 2 – and O – ) species as a result of chemical adsorption. These are the main reactive species in catalytic oxidation reaction because of its labile nature. , The detailed parameters of the study are given in Table S2. Hydrogenated HfO 2 results in a decrease in the amount of adsorbed species (as seen by the decrease in peak area) with a drop in desorption temperature as shown in Figure b.…”

Section: Results and Discussionmentioning

confidence: 99%

Solution Processed Hafnia Nanoaggregates: Influence of Surface Oxygen on Catalytic Soot Oxidation

Laishram

Shejale

Gupta

et al. 2018

ACS Sustainable Chem. Eng.

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Hafnium dioxide (HfO2) nanoaggregates are synthesized by sol–gel and hydrothermal routes followed by hydrogen annealing at different time durations. The proposed study aims to explore the effect of hydrogen annealing time on the properties of HfO2 and also envisage the catalytic soot oxidation using HfO2 nanoaggregates. It is observed that annealing under a hydrogen atmosphere brought about substantial changes in certain attributes such as chemical and textural properties with marginal changes in some other properties like optical activity and band gap. The pristine HfO2 without hydrogen annealing showed a lower ignition temperature, whereas hydrogen annealed HfO2 for 2 h showed the best catalytic performance characterized by the soot combustion temperature (T 50) in contrast to samples prepared at longer duration because of the higher surface adsorbed oxygen species in its widely distributed pores.

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Section: Results and Discussionmentioning

confidence: 99%

Solution Processed Hafnia Nanoaggregates: Influence of Surface Oxygen on Catalytic Soot Oxidation

Laishram

Shejale

Gupta

et al. 2018

ACS Sustainable Chem. Eng.

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“…The dried PMMA templates mixed with alumina microsphere were calcined in a small tube furnace under air flow (40 mL/min) to remove the PMMA template. The temperature was raised from room temperature at a rate of 1 K/min to 310 °C and held for 3 h, subsequently rising to 650 °C at a rate of 1 K/min and held for 4 h. 29 2.2. Characterization of Catalyst.…”

Section: Methodsmentioning

confidence: 99%

3DOM Mn-Based Perovskite Catalysts Modified by Potassium: Facile Synthesis and Excellent Catalytic Performance for Simultaneous Catalytic Elimination of Soot and NO_x from Diesel Engines

Zheng

Liu

et al. 2021

J. Phys. Chem. C

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Diesel engines have been widely applied, while the pollutants emitted from diesel engines have caused serious environmental pollution and human health hazards, especially for soot and NO x . Nowadays, the design and preparation of catalysts with excellent catalytic activity for simultaneous removal of soot and NO x is a great challenge in the field of diesel exhaust abatement. In this work, a series of three-dimensional ordered macroporous (3DOM) La1–x K x MnO3 catalysts with high activity for the simultaneous elimination of soot and NO x were synthesized by the colloidal crystal template method. The physicochemical properties of the as-prepared catalysts were characterized via XRD, Raman, FT-IR, SEM, TEM, N2 adsorption–desorption, XPS, H2-TPR, O2-TPD, NH3-TPD, NO-TPD, NO-TPO, and so on. The results of catalytic performance illustrated that 3DOM La0.75K0.25MnO3 exhibited highest catalytic activity with a maximum concentration of CO2 at 357 °C (T 10 = 336 °C, T 50 = 365 °C, and T 90 = 406 °C) and 50–60% NO conversion in the temperature range of 140–260 °C. Meanwhile, the reaction mechanism of 3DOM La1–x K x MnO3 catalysts was also proposed based on the characterization results and DFT calculation. The reasons for high catalytic activity are related to the strong oxidizability of high-valence B-site ions, the abundance of active oxygen species and suitable acid sites, good reducibility, and the 3DOM structure.

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“…Theo xygen desorption peaks could be divided into three parts in which the peak temperaturesa re locateda ta pproximately 170, 290, and 450 8Ca nd assigned to O 2, ad ,O 2 À ,a nd O À ,r espectively. [42,43] All these samples exhibited al ow-temperature peak at approximately 170 8C. This peak is attributed to the physically adsorbed oxygens pecies,O 2, ad .F or Au-Zr/FAU-p,t he two peaks in the high-temperature range of 250-500 8Cr elate to the surface active oxygens pecies produced by chemical adsorption, O 2 À and O À .N evertheless,t he adsorption of O 2 À and O À was not clear in the TPD profiles of Au/FAU or Zr/ FAUi nw hich Au or Zr existed alone.T his shows that active oxygens pecies were formed more easily if Au and Zr are present at the same time,p robably because of ad ecreased oxygenv acancy formation energy caused by the enhanced synergyo fA ua nd Zr at the interface,w hich is very important to promote the catalytic activity for CO oxidation.…”

Section: Effect Of Zr Doping In Au-zr/fau Catalytic Membranementioning

confidence: 99%

Hollow‐Fiber‐Supported Gold and Zirconium‐Doped Faujasite Catalytic Membranes for Hydrogen Purification

et al. 2017

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Hollow‐fiber‐supported Au‐Zr/faujasite (FAU, NaY) catalytic membranes were prepared and used as a flow‐through catalytic membrane reactor for CO preferential oxidation (CO‐PROX) in H2‐rich gas. The catalytic membranes were prepared by the modification of FAU zeolite membranes with Zr4+ and Au3+ by ion‐exchange, then activation. The obtained catalytic membranes were characterized by using TEM, X‐ray photoelectron spectroscopy, temperature‐programmed reduction, and temperature‐programmed desorption and their catalytic activity toward CO‐PROX was tested. The results showed that the activation conditions affected the size and oxidation states of the resulting Au nanoparticles strongly, and therefore, affected the catalytic activity strongly. The catalytic activity of the Au nanoparticles can be improved by the doping of Zr to form surface oxygen vacancies and the synergetic effect of Au‐Zr. Meanwhile, the presence of the zeolite framework allows the stabilization of small Au nanoparticles. The Au‐Zr/FAU catalytic membrane prepared under the optimized conditions showed a high catalytic performance (CO conversion above 95 %, turnover frequency>0.4 s−1) and outstanding stability (up to 450 h) below 80 °C, which made it a promising candidate for H2 purification.

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Catalysts of 3D ordered macroporous ZrO₂-supported core–shell Pt@CeO_2−x nanoparticles: effect of the optimized Pt–CeO₂ interface on improving the catalytic activity and stability of soot oxidation

Abstract: The catalytic performance of 3D-OM Pt1.0@CeO2−x/ZrO2-1 is better than that of 3D-OM Pt1.0/ZrO2.

Cited by 30 publications

References 49 publications

Solution Processed Hafnia Nanoaggregates: Influence of Surface Oxygen on Catalytic Soot Oxidation

Solution Processed Hafnia Nanoaggregates: Influence of Surface Oxygen on Catalytic Soot Oxidation

3DOM Mn-Based Perovskite Catalysts Modified by Potassium: Facile Synthesis and Excellent Catalytic Performance for Simultaneous Catalytic Elimination of Soot and NO_x from Diesel Engines

Hollow‐Fiber‐Supported Gold and Zirconium‐Doped Faujasite Catalytic Membranes for Hydrogen Purification

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Catalysts of 3D ordered macroporous ZrO2-supported core–shell Pt@CeO2−x nanoparticles: effect of the optimized Pt–CeO2 interface on improving the catalytic activity and stability of soot oxidation

Abstract: The catalytic performance of 3D-OM Pt1.0@CeO2−x/ZrO2-1 is better than that of 3D-OM Pt1.0/ZrO2.

Cited by 30 publications

References 49 publications

Solution Processed Hafnia Nanoaggregates: Influence of Surface Oxygen on Catalytic Soot Oxidation

Solution Processed Hafnia Nanoaggregates: Influence of Surface Oxygen on Catalytic Soot Oxidation

3DOM Mn-Based Perovskite Catalysts Modified by Potassium: Facile Synthesis and Excellent Catalytic Performance for Simultaneous Catalytic Elimination of Soot and NOx from Diesel Engines

Hollow‐Fiber‐Supported Gold and Zirconium‐Doped Faujasite Catalytic Membranes for Hydrogen Purification

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Catalysts of 3D ordered macroporous ZrO₂-supported core–shell Pt@CeO_2−x nanoparticles: effect of the optimized Pt–CeO₂ interface on improving the catalytic activity and stability of soot oxidation

3DOM Mn-Based Perovskite Catalysts Modified by Potassium: Facile Synthesis and Excellent Catalytic Performance for Simultaneous Catalytic Elimination of Soot and NO_x from Diesel Engines