Green fabrication of hierarchically-structured Pt/bio-CeO2 nanocatalysts using natural pollen templates for low-temperature CO oxidation

Jiang, Bo; Cha, Xingwen; Huang, Zhongliang; Hu, Siyuan; Xu, Kaiji; Cai, Dongren; Xiao, Jingran; Zhan, Guowu

doi:10.1016/j.mcat.2022.112251

Cited by 10 publications

(11 citation statements)

References 52 publications

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“…43-1002), respectively. 43 There are no obvious diffraction peaks corresponding to Pt or doped elements, indicating that a low loading amount of Pt and elemental doping did not affect the crystal structure of ceria.…”

Section: Resultsmentioning

confidence: 98%

“…During geometry optimization, the atoms in the bottom CeO 2 layer were fixed, while the other atoms were relaxed. 43 There are no obvious diffraction peaks corresponding to Pt or doped elements, indicating that a low loading amount of Pt and elemental doping did not affect the crystal structure of ceria.…”

Section: Computational Detailsmentioning

confidence: 98%

“…Fig.1ashows the XRD patterns of five different catalysts, including CeO 2 , Pt/CeO 2 Pt/CeO 2 -Pr, Pt/CeO 2 -Cu, and Pt/ CeO 2 -N. All the catalysts exhibited strong diffraction peaks at 2θ of 28.5°, 33.1°, 47.5°, and 56.3°, which corresponded to the (111), (200), (220), and (311) planes of CeO 2 with a cubic fluorite structure (JCPDS No. 43-1002), respectively 43. There are no obvious diffraction peaks corresponding to Pt or doped elements, indicating that a low loading amount of Pt and elemental doping did not affect the crystal structure of ceria.N 2 physisorption isotherms of the five different catalysts are shown in Fig.1b.…”

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confidence: 93%

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Fabrication of supported Pt/CeO₂ nanocatalysts doped with different elements for CO oxidation: theoretical and experimental studies

et al. 2023

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Section: Resultsmentioning

confidence: 98%

Section: Computational Detailsmentioning

confidence: 98%

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confidence: 93%

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Fabrication of supported Pt/CeO₂ nanocatalysts doped with different elements for CO oxidation: theoretical and experimental studies

et al. 2023

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“…Infiltration of Alexa Fluor 647 was used to label ZIF-8 particles to study the effect of the ZIF-8 shell layer on yeast. , Upon Alexa Fluor 647 labeling, no fluorescence was produced by yeast (Figure a), while Y@ZIF-8 100 fluoresced in red clearly (Figure b) and no coating was observed on some of the naked cells or cell aggregates, indicating that all individual yeasts were uniformly coated with ZIF-8 layers. In addition, FDA was used as a fluorescent indicator to study the effect of the ZIF-8 shell layer on the viability of yeast .…”

Section: Resultsmentioning

confidence: 99%

Construction of Immobilized Enzymes with Yeast and Metal–Organic Frameworks for Enhanced Biocatalytic Activities

Song

Peng

et al. 2023

ACS Appl. Mater. Interfaces

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Metal–organic frameworks (MOFs) have become promising host materials for enzyme immobilization and protection. Herein, ZIF-8 nanocubes were successfully self-assembled onto yeast as a biological template to obtain hybrid Y@ZIF-8. The size, morphology, and loading efficiency of ZIF-8 nanoparticles assembled on yeast templates can be well-regulated by adjusting the various synthetic parameters. Particularly, the amount of water significantly affected the particle size of ZIF-8 assembled on yeast. Through using a cross-linking agent, the relative enzyme activity of Y@ZIF-8@t-CAT could be greatly enhanced and remained the highest even after seven consecutive cycles, with improved cycling stability, as compared to that of Y@ZIF-8@CAT. In addition to the effect of the physicochemical properties of Y@ZIF-8 on the loading efficiency, the temperature tolerance, pH tolerance, and storage stability of Y@ZIF-8@t-CAT were also systematically investigated. Importantly, the catalytic activity of free catalase was decreased to 72% by 45 days, while the activity of the immobilized catalase remained above 99%, suggesting good storage stability. The present work demonstrates that yeast-templated ZIF-8 nanoparticles have a high potential to be used as biocompatible immobilization materials and are promising candidates for the preparation of effective biocatalysts in biomedicine applications.

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“…Currently, numerous catalysts have been investigated in CO oxidation. The catalysts based on noble metals such as Pt, Pd, Rh, and Au exhibited excellent performance at low-temperatures [ 19 , 20 , 21 , 22 ]. The Au nanoparticle-supported TiO 2 catalyst, in particular, showed extremely outstanding activity even at room temperature [ 23 ].…”

Section: Introductionmentioning

confidence: 99%

Effects of the Crystalline Properties of Hollow Ceria Nanostructures on a CuO-CeO2 Catalyst in CO Oxidation

et al. 2022

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The development of an efficient and economic catalyst with high catalytic performance is always challenging. In this study, we report the synthesis of hollow CeO2 nanostructures and the crystallinity control of a CeO2 layer used as a support material for a CuO-CeO2 catalyst in CO oxidation. The hollow CeO2 nanostructures were synthesized using a simple hydrothermal method. The crystallinity of the hollow CeO2 shell layer was controlled through thermal treatment at various temperatures. The crystallinity of hollow CeO2 was enhanced by increasing the calcination temperature, but both porosity and surface area decreased, showing an opposite trend to that of crystallinity. The crystallinity of hollow CeO2 significantly influenced both the characteristics and the catalytic performance of the corresponding hollow CuO-CeO2 (H-Cu-CeO2) catalysts. The degree of oxygen vacancy significantly decreased with the calcination temperature. H-Cu-CeO2 (HT), which presented the lowest CeO2 crystallinity, not only had a high degree of oxygen vacancy but also showed well-dispersed CuO species, while H-Cu-CeO2 (800), with well-developed crystallinity, showed low CuO dispersion. The H-Cu-CeO2 (HT) catalyst exhibited significantly enhanced catalytic activity and stability. In this study, we systemically analyzed the characteristics and catalyst performance of hollow CeO2 samples and the corresponding hollow CuO-CeO2 catalysts.

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Green fabrication of hierarchically-structured Pt/bio-CeO2 nanocatalysts using natural pollen templates for low-temperature CO oxidation

Cited by 10 publications

References 52 publications

Fabrication of supported Pt/CeO₂ nanocatalysts doped with different elements for CO oxidation: theoretical and experimental studies

Fabrication of supported Pt/CeO₂ nanocatalysts doped with different elements for CO oxidation: theoretical and experimental studies

Construction of Immobilized Enzymes with Yeast and Metal–Organic Frameworks for Enhanced Biocatalytic Activities

Effects of the Crystalline Properties of Hollow Ceria Nanostructures on a CuO-CeO2 Catalyst in CO Oxidation

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Green fabrication of hierarchically-structured Pt/bio-CeO2 nanocatalysts using natural pollen templates for low-temperature CO oxidation

Cited by 10 publications

References 52 publications

Fabrication of supported Pt/CeO2 nanocatalysts doped with different elements for CO oxidation: theoretical and experimental studies

Fabrication of supported Pt/CeO2 nanocatalysts doped with different elements for CO oxidation: theoretical and experimental studies

Construction of Immobilized Enzymes with Yeast and Metal–Organic Frameworks for Enhanced Biocatalytic Activities

Effects of the Crystalline Properties of Hollow Ceria Nanostructures on a CuO-CeO2 Catalyst in CO Oxidation

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Fabrication of supported Pt/CeO₂ nanocatalysts doped with different elements for CO oxidation: theoretical and experimental studies

Fabrication of supported Pt/CeO₂ nanocatalysts doped with different elements for CO oxidation: theoretical and experimental studies