4.7 Review

Single-atom site catalysts for environmental remediation: Recent advances

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Single-atom catalysts for CO oxidation, CO2 reduction, and O2 electrochemistry

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Summary: The article focuses on the application of single-atom catalysts in COx and O2 chemistry, including CO oxidation, CO2 reduction reaction, oxygen reduction reaction, and oxygen evolution reaction. In addition, the design principles and strategies for improving the intrinsic activity, selectivity, and stability of catalysts are extensively discussed.

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Highly Stable and Reactive Platinum Single Atoms on Oxygen Plasma-Functionalized CeO2 Surfaces: Nanostructuring and Peroxo Effects

Weiming Wan et al.

Summary: Oxygen plasma pre-treatment can anchor Pt single atoms on oxide supports, making them active and resistant towards sintering in the CO oxidation reaction.

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Dual optimization approach to Mo single atom dispersed g-C3N4 photocatalyst: Morphology and defect evolution

Chen Zhang et al.

Summary: The study investigated an advanced photocatalyst based on N-vacancy tubular porous g-C3N4 decorated with atomically dispersed Mo, showing remarkable photocatalytic performance for tetracycline degradation under visible light irradiation. The large specific surface area of the tubular morphology contributes to suppress the agglomeration of Mo atoms, while the N defect induces the formation of specific stable Mo-2 C/2 N configuration.

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Effect of surface acidity modulation on Pt/Al2O3 single atom catalyst for carbon monoxide oxidation and methanol decomposition

Shaohua Xie et al.

Summary: With ideal metal utilization efficiency and homogeneous active sites, single atom catalysts (SACs) have attracted extensive attention in heterogeneous catalysis field. In this study, the surface acidity of Pt SACs was tuned through modification with acidic WO3 and basic MgO. It was found that WO3 modified Pt/Al2O3 showed superior activity in methanol decomposition, while MgO modified Pt/Al2O3 performed better in CO oxidation under the reaction condition with H2O.

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Rational Regulation of Co-N-C Coordination for High-Efficiency Generation of 1O2 toward Nearly 100% Selective Degradation of Organic Pollutants

Yiyuan Yao et al.

Summary: Single oxygen-based advanced oxidation processes show great promise in selectively degrading organic pollutants. However, achieving efficient production of O-1(2) through tailored catalyst design for selective oxidation of contaminants remains challenging.

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Atomically Dispersed Manganese on Biochar Derived from a Hyperaccumulator for Photocatalysis in Organic Pollution Remediation

Peixin Cui et al.

Summary: Phytoremediation is an environmentally friendly and cost-effective method for environmental pollution remediation. However, the utilization of harvested biomass poses challenges in practical applications. This study presents a novel approach using a manganese-carbon-based single-atom catalyst method to enhance the potential utilization of biomass for phytoremediation and demonstrates its high efficiency and stability in the degradation of organic pollutants.

ENVIRONMENTAL SCIENCE & TECHNOLOGY (2022)

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Photoassisted highly efficient activation of persulfate over a single-atom Cu catalyst for tetracycline degradation: Process and mechanism

Junjian Liu et al.

Summary: A single-atomic-site Cu catalyst supported on carbon nitride material was synthesized, which improved charge transfer and separation efficiency; the experimental results showed that the reaction rate constant of this catalyst significantly increased, and the utilization of oxidant was greatly improved under LED illumination.

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Article Engineering, Environmental

Enhanced catalytic performance of atomically dispersed Pd on Pr-doped CeO2 nanorod in CO oxidation

Yanbo Deng et al.

Summary: In this study, single-atom Pd catalyst supported on Pr-doped CeO2 nanorods was prepared, and the performance and nature of Pr-coordinated atomic Pd site in CO catalytic oxidation were systematically investigated. The results showed that Pr-doping can enhance the catalytic activity of CO oxidation by reducing the formation energy of oxygen vacancies and increasing the number of oxygen vacancies around the Pd sites.

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Article Engineering, Environmental

In situ growth strategy synthesis of single-atom nickel/sulfur co-doped g-C3N4 for efficient photocatalytic tetracycline degradation and CO2 reduction

Jixiang Xu et al.

Summary: Here, a facile method was used to prepare single-atom Ni/S co-doped g-C3N4 material, and its photocatalytic activity was evaluated. The optimized material showed high activity in degrading tetracycline and reducing CO2.

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Yanan Shang et al.

Summary: A reconstructed iron single atom catalyst (Fe-SAC) with abundant conjugated pi-pi sp2 structured carbon and reactive Fe-N4 sites was reported to improve the decomposition of organics in PDS/SACs systems. The enhanced performance is attributed to the synergistic effect of the dual reaction sites.

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Molecular Engineering toward Pyrrolic N-Rich M-N4 (M = Cr, Mn, Fe, Co, Cu) Single-Atom Sites for Enhanced Heterogeneous Fenton-Like Reaction

Feng Chen et al.

Summary: A novel transition metal single-atom catalyst has been developed for efficient heterogeneous Fenton-like reactions, showing excellent cyclic stability and a wide effective pH range. The catalyst accelerates the production and separation of charge carriers, enhancing the reaction performance.

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Silver Single-Atom Catalyst for Efficient Electrochemical CO2 Reduction Synthesized from Thermal Transformation and Surface Reconstruction

Ningqiang Zhang et al.

Summary: An Ag-1 single-atom catalyst, synthesized from Ag nanoparticles and MnO2 surface reconstruction, shows high efficiency and stability for electrochemical CO2 reduction. DFT calculations indicate that single Ag sites act exclusively as active sites in the CO2RR.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2021)

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Single Atom Catalysts (SAC) trapped in defective and nitrogen-doped graphene supported on metal substrates

Anu Baby et al.

Summary: The study explores the properties of potential single atom catalysts in graphene, including stability and reactivity towards the hydrogen evolution reaction, by introducing nitrogen atoms and transforming the graphene structure to enhance stability and catalysis.

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Jingren Yang et al.

Summary: A highly efficient Fenton-like catalyst based on isolated diatomic Fe-Co anchored on N-doped porous carbon was reported, showing outstanding catalytic activity for BPA degradation. The unique FeCoN6 configuration and pyrrolic N adsorption site contribute to the ultra-high catalytic performance of the diatomic Fe-Co catalyst in the heterogeneous activation of peroxymonosulfate.

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Cobalt Single Atoms on Tetrapyridomacrocyclic Support for Efficient Peroxymonosulfate Activation

Chiheng Chu et al.

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ENVIRONMENTAL SCIENCE & TECHNOLOGY (2021)

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Toward development of single-atom ceramic catalysts for selective catalytic reduction of NO with NH3

Alexandre A. S. Goncalves et al.

Summary: Insertion of transition metal species into crystalline alumina at low temperatures allows for dispersion of the species at atomic level, leading to the fabrication of nanostructured ceramic catalysts with high specific surface area and pore volume for efficient SCR reactions. Catalysts containing Fe, Cu, or Mn showed the highest activities, while mixed compositions like CuFe and MnFe further tuned catalytic activity and selectivity. The formation profile of N2O did not change significantly for all metal aluminates except MnAl2O4, indicating their suitability for SCR and selective promotion of NO reduction.

JOURNAL OF HAZARDOUS MATERIALS (2021)

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In situ electrogeneration and activation of H2O2 by atomic Fe catalysts for the efficient removal of chloramphenicol

Xiaozhe Song et al.

Summary: The study introduces a new strategy for electron-Fenton-like process with in situ H2O2 production using bifunctional catalysts with Fe atoms introduced into defect-enriched graphene sheets (Fe/NDG). The Fe/N-DG catalysts exhibit superior mass activity and H2O2 selectivity, even under extreme pH conditions, showing promising potential for antibiotic wastewater treatment. The Fe1/N-DG catalyst with a predominant Fe-N structure demonstrates the best catalytic performance for chloramphenicol removal, providing new insights into atomic Fe-based catalysts for environmental applications.

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Cobalt single atom site catalysts with ultrahigh metal loading for enhanced aerobic oxidation of ethylbenzene

Yu Xiong et al.

Summary: The study successfully synthesized cobalt single atom site catalysts supported on carbon nitride with high metal loading. These catalysts exhibited excellent catalytic properties for the oxidation of ethylbenzene in air, showing high turnover frequency, selectivity, and stability. DFT calculations revealed the low energy barrier and high resistance to water of these catalysts, contributing to their robust catalytic performance.

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Sandwich structure stabilized atomic Fe catalyst for highly efficient Fenton-like reaction at all pH values

Sijin Zuo et al.

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Photoexcited single metal atom catalysts for heterogeneous photocatalytic H2O2 production: Pragmatic guidelines for predicting charge separation

Zhenyuan Teng et al.

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Single-atom Pt promotion of industrial Co-Mo-S catalysts for ultra-deep hydrodesulfurization

Christian Frederik Weise et al.

Summary: The Pt-Co-Mo-S catalyst contains mainly single-layer MoS2 nanocrystals with Co atoms fully covering the S-edge terminations, and Pt atoms uniquely attached to corner and edge sites in a platinum(IV) sulfide-like structural motif. Platinum is suggested to reduce the sulfur binding energy and increase the abundance of coordinately undersaturated sites (CUS) without necessarily changing the reactivity towards 4,6-DMDBT molecules, although further studies are needed for a detailed understanding.

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Use of rare earth elements in single-atom site catalysis: A critical review - Commemorating the 100th anniversary of the birth of Academician Guangxian Xu

Ningqiang Zhang et al.

Summary: Rare earth metals have potential applications in catalysis, with a focus on single-atom site catalysts (SASCs). However, systematic data analyses are still limited, but there is great potential for future developments in the field of catalysis.

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Theoretical study of CO oxidation on Au1/Co3O4 (110) single atom catalyst using density functional theory calculations

Cheng Yang et al.

Summary: Theoretical investigations have been conducted to elucidate the catalytic mechanism of CO oxidation on Au-1/Co3O4 and pristine Co3O4. The results show that the catalytic activity for CO oxidation on Au-1/Co3O4 is higher than that on pristine Co3O4.

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Synergistic Effects for Enhanced Catalysis in a Dual Single-Atom Catalyst

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A Supported Pd2 Dual-Atom Site Catalyst for Efficient Electrochemical CO2 Reduction

Ningqiang Zhang et al.

Summary: Dual-atom site catalysts (DACs) have shown significant potential in heterogeneous catalysis, with Pd-2 DAC demonstrating superior catalytic performance and stability in the electrochemical CO2 reduction reaction (CO2RR) due to electron transfer between dimeric Pd sites.

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Tailoring the Local Environment of Platinum in Single-Atom Pt1/CeO2 Catalysts for Robust Low-Temperature CO Oxidation

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Yaowen Gao et al.

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Single-Atom Fe-N4 sites promote the triplet-energy transfer process of g-C3N4 for the photooxidation

Junhui Wang et al.

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