Three-dimensionally ordered mesoporous Co3O4-supported Au–Pd alloy nanoparticles: High-performance catalysts for methane combustion

Wu, Zhixing; Deng, Jiguang; Liu, Yuxi; Xie, Shaohua; Jiang, Yang; Zhao, Xingtian; Yang, Jun; Arandiyan, Hamidreza; Guo, Guangsheng; Dai, Hongxing

doi:10.1016/j.jcat.2015.09.008

Cited by 134 publications

(66 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the intensity of this PdO band decreased greatly for Pd/CeO 2 -S catalyst, reflecting the lower content of PdO species on Pd/CeO 2 -S; which agreed well with the H 2 -TPR results. Furthermore, early studies showed that the reaction mechanism of CH 4 combustion reaction over Pd-based catalysts usually follows the Mars-van Krevelen mechanism [42][43][44]. During the reaction, the decomposition and reformation of PdO species has been observed (PdO→Pd→PdO) [14]; that is, CH 4 firstly reacts with O bounded with Pd to create CO 2 /H 2 O and oxygen vacancies, the generated oxygen vacancies are then supplemented by the gaseous oxygen or the bulk lattice oxygen.…”

Section: Raman Spectroscopymentioning

confidence: 99%

Catalytic Performance of Palladium Supported on Sheaf-Like Ceria in the Lean Methane Combustion

Zhang

Shi

et al. 2019

Nanomaterials

View full text Add to dashboard Cite

Sheaf-like CeO 2 (CeO 2 -S) in microscale was prepared by the hydrothermal method, and then etched with KOH aiming to obtain an imperfect fluorite structure (CeO 2 -SK) with high content of oxygen vacancies and oxygen mobility. With CeO 2 -S and CeO 2 -SK as supports respectively, a modified colloidal deposition method was employed to obtain Pd/CeO 2 catalysts for being used in lean methane combustion. According to the inductively coupled plasma (ICP), N 2 physisorption and scanning electron microscopy (SEM) results, the Pd supported catalysts are very similar in their Pd loading, surface area and morphologies. SEM and transmission electron microscopy (TEM) results revealed various nanorods exposed CeO 2 (110) and (100) facets on Pd/CeO 2 -SK surface after KOH etching. Raman spectra and H 2 -temperature programmed reduction (H 2 -TPR) results indicated that Pd/CeO 2 -SK catalyst has a much higher content of catalytic active PdO species than Pd/CeO 2 -S catalyst. It was also found that the catalytic performance of Pd/CeO 2 in lean methane combustion depends greatly upon the exposing crystal planes and oxygen vacancies content of sheaf-like CeO 2 , and Pd/CeO 2 -SK exhibits higher activity than Pd/CeO 2 -S. The larger amount of CeO 2 (110) and (100) planes on Pd/CeO 2 -SK surface can enhance the formation of oxygen vacancies, active Pd species and migration of lattice oxygen, which all evidently improve the redox ability and catalytic activity of the Pd/CeO 2 -SK catalysts in lean methane combustion.

show abstract

Section: Raman Spectroscopymentioning

confidence: 99%

Catalytic Performance of Palladium Supported on Sheaf-Like Ceria in the Lean Methane Combustion

Zhang

Shi

et al. 2019

Nanomaterials

View full text Add to dashboard Cite

show abstract

“…[55,56] Accordingly, the surface basicity of Pt/NC-CeO 2 ,p articularly strongb asic surfaces ites, can play an importantr ole in improving the oxidation of alcoholic hydroxyl groups of HMF.T he XPS resultss how the presence of more surfaceP t 2 + species on Pt/NC-CeO 2 ,i na ddition to electron-deficient Pt 0 species. These electron-deficient Pt 0 and cationic Pt 2 + species may facilitate CÀHb ond dissociation and molecular oxygen activation,s imilar to Au d + species, [57,58] and thereby benefitt he enhanced catalytic behavior of Pt/NC-CeO 2 .…”

Section: Mechanism Of Catalytichmf Oxidationmentioning

confidence: 99%

Pt Nanoparticles Supported on Nitrogen‐Doped‐Carbon‐Decorated CeO₂ for Base‐Free Aerobic Oxidation of 5‐Hydroxymethylfurfural

Fan

et al. 2018

Chemistry An Asian Journal

View full text Add to dashboard Cite

Currently, the base-free aerobic oxidation of biomass-derived 5-hydroxymethylfurfural (HMF) to produce 2,5-furandicarboxylic acid (FDCA) is attracting intense interest due to its prospects for the green, sustainable, and promising production of biomass-based aromatic polymers. Herein, we have developed a new Pt catalyst supported on nitrogen-doped-carbon-decorated CeO (NC-CeO ) for the aerobic oxidation of HMF in water without the addition of any homogeneous base. It was demonstrated that the small-sized Pt particles could be well dispersed on the surface of the hybrid NC-CeO support, and the activity of the supported Pt catalyst depended strongly on the surface structure and properties of the catalysts. The as-fabricated Pt/NC-CeO catalyst, with abundant surface defects, enhanced basicity, and favorable electron-deficient metallic Pt species, enabled an almost 100 % yield of FDCA in water with molecular oxygen (0.4 MPa) at 110 °C for 8 h without the addition of any homogeneous base, which is indicative of exceptional catalytic performance. Furthermore, this Pt/NC-CeO catalyst also showed good stability and reusability owing to strong metal-support interactions. An understanding of the role of surface structural defects and basicity of the hybrid NC-CeO support provides a basis for the rational design of high-performance and stable supported metal catalysts with practical applications in various transformations of biomass-derived compounds.

show abstract

“…Among them, the content of O ads could reflect the amount of the initial oxygen vacancies on the catalyst surfaces. Besides, the O ads is considered to own higher mobility than the O latt so that it could react with CO adsorbed on Co 3+ to generate oxygen vacancies more quickly [42]. Therefore, the balance be-tween the contents of Co 3+ and O ads is essential for the high activity of CO oxidation, as the equilibrium between CO capture and oxygen supplement could reach the highest efficiency.…”

Section: Articlesmentioning

confidence: 99%

Structure-induced hollow Co3O4 nanoparticles with rich oxygen vacancies for efficient CO oxidation

et al. 2019

View full text Add to dashboard Cite

Co 3 O 4 has been considered as one kind of promising catalysts for the oxidation of CO. According to the Mars-van Krevelen mechanism, oxygen vacancies of Co 3 O 4 play a significant role in catalytic activity. Herein, we report a novel structure-induced strategy to develop hollow Co 3 O 4 with rich oxygen vacancies for efficient oxidation of CO. Through a reduction-oxidation pyrolysis process, the metal-organic frameworks (MOFs) precursor (i.e., ZIF-67) is transformed into H-Co 3 O 4 @H-C, in which hollow Co 3 O 4 (H-Co 3 O 4 ) nanoparticles (NPs) are embedded in hollow carbon (H-C) shell. The hollow Co 3 O 4 NPs feature rich oxygen vacancies and finish a complete conversion of CO at 130°C, which is much lower than that of solid Co 3 O 4 (the temperature of full CO conversion T 100 =220°C). Besides, the hollow carbon shell could also reduce the diffusion resistance during the oxidation process. Benefiting from the unique hollow structures, H-Co 3 O 4 @H-C even shows comparable activity to noble metal catalysts under high weight hourly space velocities (WHSVs) up to 240,000 mL h -1 g cat. -1 . Furthermore, the H-Co 3 O 4 @H-C catalyst also shows good durability with only a slight decline after the reaction has been operated for 24 h.

show abstract

Three-dimensionally ordered mesoporous Co3O4-supported Au–Pd alloy nanoparticles: High-performance catalysts for methane combustion

Cited by 134 publications

References 48 publications

Catalytic Performance of Palladium Supported on Sheaf-Like Ceria in the Lean Methane Combustion

Catalytic Performance of Palladium Supported on Sheaf-Like Ceria in the Lean Methane Combustion

Pt Nanoparticles Supported on Nitrogen‐Doped‐Carbon‐Decorated CeO₂ for Base‐Free Aerobic Oxidation of 5‐Hydroxymethylfurfural

Structure-induced hollow Co3O4 nanoparticles with rich oxygen vacancies for efficient CO oxidation

Contact Info

Product

Resources

About

Three-dimensionally ordered mesoporous Co3O4-supported Au–Pd alloy nanoparticles: High-performance catalysts for methane combustion

Cited by 134 publications

References 48 publications

Catalytic Performance of Palladium Supported on Sheaf-Like Ceria in the Lean Methane Combustion

Catalytic Performance of Palladium Supported on Sheaf-Like Ceria in the Lean Methane Combustion

Pt Nanoparticles Supported on Nitrogen‐Doped‐Carbon‐Decorated CeO2 for Base‐Free Aerobic Oxidation of 5‐Hydroxymethylfurfural

Structure-induced hollow Co3O4 nanoparticles with rich oxygen vacancies for efficient CO oxidation

Contact Info

Product

Resources

About

Pt Nanoparticles Supported on Nitrogen‐Doped‐Carbon‐Decorated CeO₂ for Base‐Free Aerobic Oxidation of 5‐Hydroxymethylfurfural