Remarkable active-site dependent H2O promoting effect in CO oxidation

Zhao, Shu; Fang, Chen; Duan, Sibin; Shao, Bin; Li, Tianbo; Tang, Huazhong; Lin, Qiushi; Zhang, Junying; Li, Lin; Huang, Jiahui; Bion, Nicolas; Liu, Wei; Sun, Hui; Wang, Aiqin; Haruta, Masatake; Qiao, Botao; Li, Jun; Liu, Jingyue; Zhang, Tao

doi:10.1038/s41467-019-11871-w

Cited by 114 publications

(82 citation statements)

References 57 publications

(80 reference statements)

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“…Sub-nanosized metal clusters and nanoparticles usually possess higher catalytic activity and selectivity as compared with bulk metal [19][20][21][22]. As an effective approach to lower the cost and consumption of catalysts, single-atom catalysts (SACs), which was first proposed in 2011 [23][24][25][26], have become promising alternative in heterogeneous catalysis [27][28][29][30]. SACs embedded on different supports have revealed superb catalytic activity and selectivity as compared with subnanosized metal clusters [31,32].…”

Section: Introductionmentioning

confidence: 99%

Non-noble metal single-atom catalyst of Co1/MXene (Mo2CS2) for CO oxidation

Talib

Baskaran

et al. 2020

Sci. China Mater.

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MXene is a variety of new two-dimensional (2D) materials with early transition metal carbides, nitrides, and carbonitrides. Quantum chemical studies have been carried out on the geometries, electronic structures, stability and catalytic properties of a non-noble metal single-atom catalyst (SAC) with single Co atom anchored on MXene materials of Mo 2 CS 2. The Co adatom anchored on top of the Mo atom of this MXene is found to be rather stable, and this SAC is appropriate for CO oxidation. The charge transfers from the surface to the adsorbed CO and O 2 play a significant role in the activation of these molecules on Co 1 /Mo 2 CS 2. With this catalyst, the Eley-Rideal (ER), Langmuir-Hinshelwood (LH), and Termolecular Eley-Rideal (TER) mechanisms are explored for CO oxidation. We find that, while all the three mechanisms are feasible at low temperature, Co 1 /Mo 2 CS 2 possesses higher catalytic activity for CO oxidation through the TER mechanism that features an intriguing OC(OO)CO intermediate (IM) adsorbed on Co single atom. The calculated activation energy barriers of the rate-limiting step are 0.67 eV (TER), 0.78 eV (LH) and 0.88 eV (ER), respectively. The present study illustrates that it is promising to develop and design low-cost, non-noble metal SACs using MXene types of 2D materials.

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Section: Introductionmentioning

confidence: 99%

Non-noble metal single-atom catalyst of Co1/MXene (Mo2CS2) for CO oxidation

Talib

Baskaran

et al. 2020

Sci. China Mater.

Self Cite

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“…On the other hand, though, water promoting effects over metal nanoparticles and SACs catalysts were common phenomenon observed in CO oxidation, the improving degree would widely vary from one system to another. For instance, the remarkable promoting effect of water (2 vol.%) made Au1/CeO2 about 30-fold and two orders of magnitude more active than traditional Au/CeO2 nanocatalysts and commercial TWC, respectively [98]. Considering that abundant OH groups could be formed on the surface of CeO2 in presence of water vapor.…”

Section: Catalytic Oxidation Of Comentioning

confidence: 99%

“…PGMs-based SACs showed high activities towards CO elimination at low-temperature since Pt-SACs could form a distinctive interface with the support (i.e. reduction of Ce ions at Pt-CeO2 interface in Pt1/CeO2) and proceed according to MvK mechanism [21,50,51,56,86,93,95,98,102,106,107]. Although Al2O3 is non-reducible and inert, Al2O3 supported PGM-based SACs catalysts are also attractive because Al2O3 could be used as common support material in composite TWCs and DOCs to expand the surface area.…”

Section: Catalytic Oxidation Of Comentioning

confidence: 99%

Single-atom site catalysts for environmental catalysis

et al. 2020

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In recent decades, the environmental protection and long-term sustainability have become the focus of attention due to the increasing pollution generated by the intense industrialization. To overcome these issues, environmental catalysis has increasingly been used to solve the negative impact of pollutants emission on the global environment and human health. Supported platinum-metal-group (PGM) materials are commonly utilized as the state-of-the-art catalysts to eliminate gaseous pollutants but large quantities of PGMs are required. By comparison, single-atom site catalysts (SACs) have attracted much attention in catalysis owing to their 100% atom efficiency and unique catalytic performances towards various reactions. Over the past decade, we have witnessed burgeoning interests of SACs in heterogeneous catalysis. However, to the best of our knowledge, the systematic summary and analysis of SACs in catalytic elimination of environmental pollutants has not yet been reported. In this paper, we summarize and discuss the environmental catalysis applications of SACs. Particular focus was paid to automotive and stationary emission control, including model reaction (CO oxidation, NO reduction and hydrocarbon oxidation), overall reaction (three-way catalytic and diesel oxidation reaction), elimination of volatile organic compounds (formaldehyde, benzene, and toluene), and removal/decomposition of other pollutants (Hg 0 and SO 3). Perspectives related to further challenges, directions and design strategies of single-atom site catalysts in environmental catalysis were also provided.

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“…Many methods have been developed for synthesizing single‐atom and cluster catalysts, such as mass‐selected soft landing, metal leaching, co‐precipitation, facile adsorption, atomic layer deposition and pyrolysis methods. Among them, the facile adsorption method is very simple and appropriate for practical industrial applications.…”

Section: Introductionmentioning

confidence: 99%

Preparation and catalytic performance of ZrO₂‐supported Pt single‐atom and cluster catalyst for hydrogenation of 2,4‐dinitrotoluene to 2,4‐toluenediamine

Ren

Wang

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUND: The catalytic hydrogenation of 2,4-dinitrotoluene is an environmentally benign technology for the production of 2,4-toluenediamine, which is a key intermediate in production of polyurethane foams, elastomers and sealants. Most of the existing precious metal nanocatalysts, however, suffer from low catalytic efficiency and high catalyst costs. Single metal atoms and clusters anchored on carriers, with high atom utilization efficiency, provide a good strategy for creating cost-effective catalysts. In the work reported, a ZrO 2 -supported Pt single-atom and cluster catalyst was successfully prepared using a facile adsorption method for hydrogenation of 2,4-dinitrotoluene to 2,4-toluenediamine.RESULTS: Pt concentration in solution and reduction temperature had a substantial effect on the Pt loadings, dispersion and the corresponding catalytic performance. The 15Pt/ZrO 2 -300 catalyst exhibited the highest catalytic activity. At 80°C and hydrogen pressure of 1 MPa, the initial hydrogenation rate reached as high as 4583.33 mol H2 mol Pt −1 min −1 , which was more than 40 times that for a conventional Pd/C catalyst. CONCLUSIONS: ZrO 2 -supported Pt single-atom and cluster catalyst was successfully fabricated. The method was implemented on the foundation of strong charge adsorption between Pt ions and ZrO 2 carrier. The prepared Pt single-atom and cluster catalyst showed excellent catalytic activity for hydrogenation of 2,4-dinitrotoluene to 2,4-toluenediamine.

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Remarkable active-site dependent H2O promoting effect in CO oxidation

Cited by 114 publications

References 57 publications

Non-noble metal single-atom catalyst of Co1/MXene (Mo2CS2) for CO oxidation

Non-noble metal single-atom catalyst of Co1/MXene (Mo2CS2) for CO oxidation

Single-atom site catalysts for environmental catalysis

Preparation and catalytic performance of ZrO₂‐supported Pt single‐atom and cluster catalyst for hydrogenation of 2,4‐dinitrotoluene to 2,4‐toluenediamine

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Remarkable active-site dependent H2O promoting effect in CO oxidation

Cited by 114 publications

References 57 publications

Non-noble metal single-atom catalyst of Co1/MXene (Mo2CS2) for CO oxidation

Non-noble metal single-atom catalyst of Co1/MXene (Mo2CS2) for CO oxidation

Single-atom site catalysts for environmental catalysis

Preparation and catalytic performance of ZrO2‐supported Pt single‐atom and cluster catalyst for hydrogenation of 2,4‐dinitrotoluene to 2,4‐toluenediamine

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Preparation and catalytic performance of ZrO₂‐supported Pt single‐atom and cluster catalyst for hydrogenation of 2,4‐dinitrotoluene to 2,4‐toluenediamine