Pd model catalysts: Effect of air pulse length during redox aging on Pd redispersion

Lupescu, Jason; Schwank, Johannes W.; Fisher, Galen B.; Hangas, J.; Peczonczyk, Sabrina L.; Paxton, William A.

doi:10.1016/j.apcatb.2017.07.055

Cited by 35 publications

(13 citation statements)

References 60 publications

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“…Redox-active ceria and ceria-based mixed oxides are of particular interest because the interconversion of Ce(III) and Ce(IV) allows for facile oxygen storage and removal . Because of this property, cerium-based oxides are widely used for applications in automotive exhaust converters, hydrocarbon reforming, and water gas shift reactions. − By doping zirconia into the ceria support, a CeO 2 –ZrO 2 solid solution (CZ) is formed, which greatly enhances thermal stability and oxygen storage capacity and increases the accessibility of bulk lattice oxygen. − Using ceria as a support for methane dry reforming reaction increases the conversion, lowers the carbon formation, and enhances the reverse-water gas shift (RWGS) reaction . The surface oxygen vacancies of the CZ support promote the activation of CO 2 during reaction. , Mobile oxygen species stored in the CZ support facilitate the removal of deposited coke, and thus, these species extend catalyst lifetime. , Additionally, CZ supports interact strongly with the Ni metal, which stabilizes small surface nickel particles …”

Section: Introductionmentioning

confidence: 99%

Nickel Speciation and Methane Dry Reforming Performance of Ni/Ce_xZr_1–xO₂ Prepared by Different Synthesis Methods

Lyu

Jocz

et al. 2020

ACS Catal.

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Ceria–zirconia-supported Ni catalysts (Ni/Ce0.83Zr0.17O2 or Ni/CZ) are prepared by dry impregnation, strong electrostatic adsorption, coprecipitation (CP), and combustion synthesis (CS). The nature and abundance of Ni species in these samples are characterized by X-ray adsorption spectroscopy, temperature-programmed reduction, and CO chemisorption. The bulk synthesis methods (i.e., CP and CS) produce Ni cations that are incorporated into the CZ lattice forming mixed-metal oxides with Ni3+ species at low Ni content. The formation of mixed-metal oxides increases the reducibility of CZ and increases the abundance of active surface oxygen. All NiO/CZ catalysts are active for methane dry reforming and retain some of their activity at a steady state. The initial methane conversion correlates linearly with the fraction of accessible Ni after reduction. The predominant path of catalyst deactivation strongly depends on the structure of the catalyst and, thus, on the synthesis method used. All catalysts experience agglomeration of Ni particles under reaction conditions. Improving the Ni dispersion to isolated species embedded in a support does not improve resistance to Ni particle growth. Coke formation is inversely related to the concentration of active surface oxygen. The dominant deactivation mechanism for catalysts made by CS is the encapsulation of Ni particles by the support.

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Section: Introductionmentioning

confidence: 99%

Nickel Speciation and Methane Dry Reforming Performance of Ni/Ce_xZr_1–xO₂ Prepared by Different Synthesis Methods

Lyu

Jocz

et al. 2020

ACS Catal.

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“…2 However, lean burn engines operate with a large excess of air, leading to a signicant concentration of oxygen in the exhausts, where the noble-metal three-way catalysts cannot work well to reduce nitrogen oxides (NO x ). 3 A large amount of NO x produced by lean burn engines leads to serious air pollution and public health problems.…”

Section: Introductionmentioning

confidence: 99%

The effects of Bi₂O₃ on the selective catalytic reduction of NO by propylene over Co₃O₄ nanoplates

Zhong

Liu

et al. 2019

RSC Adv.

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“…XRD is used to analyze the crystal structure of materials ( Lupescu et al., 2018 ). By analyzing the peaks, the size of noble metals supported on TiO 2 can be explored.…”

Section: Step-by-step Methods Detailsmentioning

confidence: 99%

Protocol on irradiation-dark photochemical deposition and characterization of metal nanoclusters on semiconductor support

Zhu

Jia

et al. 2022

STAR Protocols

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Pd model catalysts: Effect of air pulse length during redox aging on Pd redispersion

Cited by 35 publications

References 60 publications

Nickel Speciation and Methane Dry Reforming Performance of Ni/Ce_xZr_1–xO₂ Prepared by Different Synthesis Methods

Nickel Speciation and Methane Dry Reforming Performance of Ni/Ce_xZr_1–xO₂ Prepared by Different Synthesis Methods

The effects of Bi₂O₃ on the selective catalytic reduction of NO by propylene over Co₃O₄ nanoplates

Protocol on irradiation-dark photochemical deposition and characterization of metal nanoclusters on semiconductor support

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Pd model catalysts: Effect of air pulse length during redox aging on Pd redispersion

Cited by 35 publications

References 60 publications

Nickel Speciation and Methane Dry Reforming Performance of Ni/CexZr1–xO2 Prepared by Different Synthesis Methods

Nickel Speciation and Methane Dry Reforming Performance of Ni/CexZr1–xO2 Prepared by Different Synthesis Methods

The effects of Bi2O3 on the selective catalytic reduction of NO by propylene over Co3O4 nanoplates

Protocol on irradiation-dark photochemical deposition and characterization of metal nanoclusters on semiconductor support

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Product

Resources

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Nickel Speciation and Methane Dry Reforming Performance of Ni/Ce_xZr_1–xO₂ Prepared by Different Synthesis Methods

Nickel Speciation and Methane Dry Reforming Performance of Ni/Ce_xZr_1–xO₂ Prepared by Different Synthesis Methods

The effects of Bi₂O₃ on the selective catalytic reduction of NO by propylene over Co₃O₄ nanoplates