Immobilizing ultrafine bimetallic PtAg alloy onto uniform MnO2 microsphere as a highly active catalyst for CO oxidation

Mo, Shengpeng; Peng, Peng; Pei, Yinchang; Shen, Taiming; Quan, Xie; Fu, Mingli; Chen, Yunfa; Ye, Daiqi

doi:10.1016/j.cclet.2020.11.062

Cited by 18 publications

(6 citation statements)

References 28 publications

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“…Because of the interaction between Au and Pt, the active hydrogen atoms on the catalyst surface overflow from Au–Pt to Mn x O y C z . This interaction caused the existence of low reduction temperatures in the Au–Pt/Mn x O y C z catalyst, demonstrating the catalyst’s low-temperature reducibility and the generation of high-mobility oxygen species on the catalyst surface …”

Section: Resultsmentioning

confidence: 96%

“…This interaction caused the existence of low reduction temperatures in the Au− Pt/Mn x O y C z catalyst, demonstrating the catalyst's low-temperature reducibility and the generation of high-mobility oxygen species on the catalyst surface. 49 The morphological characteristics of the supported catalysts are shown in Figure 5. The Au−Pt/AC catalyst shows an irregular and bulky bulk structure with a smooth surface and no metal particles (Figure 5a).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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MOFs-Derived Mn_xO_yC_z Supported Bimetallic Au–Pt Catalyst for the Catalytic Oxidation of Glycerol to Glyceric Acid

Yu,

Ke,

Wang

et al. 2024

Chem. Mater.

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The specific structure of the support and the interactions between the catalyst components can lead to electron transfer, which in turn could affect the catalytic performance in heterogeneous catalytic reactions. In this paper, we have successfully prepared Mn x O y C z composite materials from the calcination of the Mn-organic framework. Then bimetallic Au−Pt nanoparticles (NPs) were supported onto Mn x O y C z via the colloidal-deposition method. These catalysts were tested in the selective oxidation of glycerol to glyceric acid under basic conditions. The results demonstrated that the catalytic activity of the bimetallic Au−Pt/ Mn x O y C z catalyst is considerably superior to those of the monometallic (Au and Pt) supported catalysts. Under the optimized conditions, 100% of glycerol can convert with 57.3% selectivity of glyceric acid. Multicharacterizations showed that the strong interaction between Au and Pt in the Au−Pt/Mn x O y C z catalyst can enhance the dispersion of Au−Pt alloy NPs, promoting the electronic coupling effect on the metal surface. At the same time, the rich oxygen vacancies in this catalyst can facilitate the activation of oxygen, which causes the Au−Pt/Mn x O y C z catalyst to show better catalytic activity. Specifically, the interaction between Au and Pt not only decreases the particle size of the Au−Pt alloy NPs but also promotes the reduction of Mn-based oxides and the mobility of oxygen. The absence of Au leads to a decrease in Pt 4f 7/2 binding energy, resulting in an enrichment of electrons at the Pt active site and enhancing the oxidation ability of the primary hydroxyl group. In addition, the Au−Pt/Mn x O y C z catalyst showed excellent stability without substantial loss of activity after being recycled five times. The insights and methodology may provide some new guidance for the reasonable design of bimetallic catalysts for the catalytic oxidation of biopolyols under mild conditions.

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Section: Resultsmentioning

confidence: 96%

Section: ■ Results and Discussionmentioning

confidence: 99%

MOFs-Derived Mn_xO_yC_z Supported Bimetallic Au–Pt Catalyst for the Catalytic Oxidation of Glycerol to Glyceric Acid

Yu,

Ke,

Wang

et al. 2024

Chem. Mater.

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“…MnO 2 can adsorb O 2 from the air because of the special structure of MnO 2 and its high specific surface area, which increases the O/Mn ratio. 19 In addition, the presence of -OH groups and H 2 O on the surface and in the tunnels of MnO 2 also increases the O/Mn ratio. 20 Therefore, the O/Mn molar ratio was slightly greater than 2 and the main components were MnO 2 for a-MnO 2 , d-MnO 2 and g-MnO 2 considering the above factors.…”

Section: Resultsmentioning

confidence: 99%

Rapid, efficient and controllable photo-assisted polysulfide sealing over MnO₂

et al. 2023

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“…Inspired by the inherent advantages of MOFs and CDs, a novel nanozyme exhibiting enzyme-mimic catalytic activity and FL property might be synthesized by combining the above active components together. The successful metal ion doping provided more catalytic sites, which effectively accelerated the chemical transformations, improved catalytic efficiency, and realized ‘double catalytic activity amplification’. , Meanwhile, the porous structure of MOF could further slow the diffusion rate of CL substrates from bulk solution to enter the catalytic center, which was beneficial to construct a nanozyme-catalyzed long-lasting CL system.…”

Section: Introductionmentioning

confidence: 99%

Bifunctional MOF-Encapsulated Cobalt-Doped Carbon Dots Nanozyme-Powered Chemiluminescence/Fluorescence Dual-Mode Detection of Aflatoxin B1

Yi,

Xiao,

Kang

et al. 2024

ACS Appl. Mater. Interfaces

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A novel bifunctional MOF-encapsulated cobalt-doped carbon dots nanozyme (Co-CD/PMOF) with excellent peroxidasemimic catalytic activity and fluorescence property was synthesized and employed to fabricate a chemiluminescence/fluorescence (CL/FL) dualmode immunosensor for AFB1 detection. Co-CD/PMOF could catalyze the luminol/H 2 O 2 system to generate robust and long-lasting CL signals due to the slow diffusion effect and continuous generation of •OH, O 2•− , and 1 O 2 species. Differing from traditional flash-type CL emissions, this glow-type CL emission is helpful to fabricate a sensitive and accurate CL sensing platform. Then the CL/FL dual-mode detection of AFB1 was developed using antibody-functionalized Co-CD/PMOF as the signalamplifying nanoprobe. The CL mode assay based on indirect competitive immune principle was carried out on a chemiluminescence optical fiber platform, where the AFB1-OVA-functionalized optical fiber probe was employed for biorecognition, separation, and signal conducting. The AFB1 detection range and LOD were 0.63−69.36 ng/mL and 0.217 ng/mL, respectively. Using AFB1 antibodyfunctionalized immunomagnetic beads for capturing and separation, the FL mode detection of AFB1 was established based on the sandwich immune principle. A linear range of 0.54−51.91 ng/mL and a LOD of 0.027 ng/mL were obtained. This work designed a sensitive, rapid, and reliable nanozyme-powered dual-mode assay strategy and provided technical support in the field of environmental monitoring and food safety.

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Immobilizing ultrafine bimetallic PtAg alloy onto uniform MnO2 microsphere as a highly active catalyst for CO oxidation

Cited by 18 publications

References 28 publications

MOFs-Derived Mn_xO_yC_z Supported Bimetallic Au–Pt Catalyst for the Catalytic Oxidation of Glycerol to Glyceric Acid

MOFs-Derived Mn_xO_yC_z Supported Bimetallic Au–Pt Catalyst for the Catalytic Oxidation of Glycerol to Glyceric Acid

Rapid, efficient and controllable photo-assisted polysulfide sealing over MnO₂

Bifunctional MOF-Encapsulated Cobalt-Doped Carbon Dots Nanozyme-Powered Chemiluminescence/Fluorescence Dual-Mode Detection of Aflatoxin B1

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Immobilizing ultrafine bimetallic PtAg alloy onto uniform MnO2 microsphere as a highly active catalyst for CO oxidation

Cited by 18 publications

References 28 publications

MOFs-Derived MnxOyCz Supported Bimetallic Au–Pt Catalyst for the Catalytic Oxidation of Glycerol to Glyceric Acid

MOFs-Derived MnxOyCz Supported Bimetallic Au–Pt Catalyst for the Catalytic Oxidation of Glycerol to Glyceric Acid

Rapid, efficient and controllable photo-assisted polysulfide sealing over MnO2

Bifunctional MOF-Encapsulated Cobalt-Doped Carbon Dots Nanozyme-Powered Chemiluminescence/Fluorescence Dual-Mode Detection of Aflatoxin B1

Contact Info

Product

Resources

About

MOFs-Derived Mn_xO_yC_z Supported Bimetallic Au–Pt Catalyst for the Catalytic Oxidation of Glycerol to Glyceric Acid

MOFs-Derived Mn_xO_yC_z Supported Bimetallic Au–Pt Catalyst for the Catalytic Oxidation of Glycerol to Glyceric Acid

Rapid, efficient and controllable photo-assisted polysulfide sealing over MnO₂