scholarly journals Unraveling the coordination structure-performance relationship in Pt1/Fe2O3 single-atom catalyst

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Yujing Ren ◽  
Yan Tang ◽  
Leilei Zhang ◽  
Xiaoyan Liu ◽  
Lin Li ◽  
...  
Keyword(s):  
Coordination Chemistry ◽  
Homogeneous Catalysis ◽  
Catalytic Performance ◽  
Inert Atmosphere ◽  
Single Atom ◽  
Unique Role ◽  
Local Coordination ◽  
Single Atoms ◽  
Heterogeneous And Homogeneous Catalysis

Abstract Heterogeneous single-atom catalyst (SAC) opens a unique entry to establishing structure–performance relationship at the molecular level similar to that in homogeneous catalysis. The challenge lies in manipulating the coordination chemistry of single atoms without changing single-atom dispersion. Here, we develop an efficient synthetic method for SACs by using ethanediamine to chelate Pt cations and then removing the ethanediamine by a rapid thermal treatment (RTT) in inert atmosphere. The coordination chemistry of Pt single atoms on a Fe2O3 support is finely tuned by merely adjusting the RTT temperature. With the decrease in Pt-O coordination number, the oxidation state of Pt decreases, and consequently the hydrogenation activity increases to a record level without loss of chemoselectivity. The tunability of the local coordination chemistry, oxidation states of the metal, and the catalytic performance of single atoms reveals the unique role of SACs as a bridge between heterogeneous and homogeneous catalysis.

Improving peroxymonosulfate activation by copper ion-saturated adsorbent-based single atom catalysts for the degradation of organic contaminants: electron-transfer mechanism and the key role of Cu single atoms

2021 ◽  
Author(s):  
Jingwen Pan ◽  
Baoyu Gao ◽  
Pijun Duan ◽  
Kangying Guo ◽  
Muhammad Akram ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Organic Contaminants ◽  
High Salinity ◽  
Copper Ion ◽  
Single Atom ◽  
Electron Transfer Mechanism ◽  
Persulfate Oxidation ◽  
Single Atoms ◽  
Oxidation Technology

Nonradical pathway-based persulfate oxidation technology is considered to be a promising method for high-salinity organic wastewater treatment.

scholarly journals Modulating the local coordination environment of single-atom catalysts for enhanced catalytic performance

Nano Research ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1842-1855 ◽  
Author(s):  
Xinyuan Li ◽  
Hongpan Rong ◽  
Jiatao Zhang ◽  
Dingsheng Wang ◽  
Yadong Li
Keyword(s):  
Catalytic Performance ◽  
Single Atom ◽  
Coordination Environment ◽  
Local Coordination

scholarly journals Porous Materials Confining Single Atoms for Catalysis

2021 ◽  
Vol 9 ◽  
Author(s):  
Tao Zhu ◽  
Yiwei Han ◽  
Shuai Liu ◽  
Bo Yuan ◽  
Yatao Liu ◽  
...  
Keyword(s):  
Porous Material ◽  
Porous Materials ◽  
Shape Selectivity ◽  
Catalytic Performance ◽  
High Specific Surface Area ◽  
Single Atom ◽  
Research Progress ◽  
Porous Support ◽  
Support Materials ◽  
Single Atoms

In recent years, single-atom catalysts (SACs) have received extensive attention due to their unique structure and excellent performance. Currently, a variety of porous materials are used as confined single-atom catalysts, such as zeolites, metal-organic frameworks (MOFs), or carbon nitride (CN). The support plays a key role in determining the coordination structure of the catalytic metal center and its catalytic performance. For example, the strong interaction between the metal and the carrier induces the charge transfer between the metal and the carrier, and ultimately affects the catalytic behavior of the single-atom catalyst. Porous materials have unique chemical and physical properties including high specific surface area, adjustable acidity and shape selectivity (such as zeolites), and are rational support materials for confined single atoms, which arouse research interest in this field. This review surveys the latest research progress of confined single-atom catalysts for porous materials, which mainly include zeolites, CN and MOFs. The preparation methods, characterizations, application fields, and the interaction between metal atoms and porous support materials of porous material confined single-atom catalysts are discussed. And we prospect for the application prospects and challenges of porous material confined single-atom catalysts.

scholarly journals Phosphomolybdic acid supported atomically dispersed transition metal atoms (M = Fe, Co, Ni, Cu, Ru, Rh, Pd, Ag, Os, Ir, Pt, and Au): stable single atom catalysts studied by density functional theory

RSC Advances ◽  
2017 ◽  
Vol 7 (40) ◽  
pp. 24925-24932 ◽  
Author(s):  
Shujiao Wang ◽  
Yingxin Feng ◽  
Sen Lin ◽  
Hua Guo
Keyword(s):  
Density Functional Theory ◽  
Coordination Chemistry ◽  
Transition Metal ◽  
Homogeneous Catalysis ◽  
Density Functional ◽  
Phosphomolybdic Acid ◽  
Single Atom ◽  
Functional Theory ◽  
Metal Atoms ◽  
Transition Metal Atoms

This study will provide a guideline for designing stable single atom catalysts by taking advantage of coordination chemistry and homogeneous catalysis.

Synergetic role of charge transfer and strain engineering in improving the catalysis of Pd single-atom-thick motifs stabilized on a defect-free MoS2/Ag(Au)(111) heterostructure

2020 ◽  
Vol 8 (33) ◽  
pp. 17238-17247
Author(s):  
Zhixin Su ◽  
Rui Pang ◽  
Xiaoyan Ren ◽  
Shunfang Li
Keyword(s):  
Charge Transfer ◽  
Active Sites ◽  
Catalytic Performance ◽  
Strain Engineering ◽  
Single Atom

Single-atom-thick-PdN magic nanomotifs are demonstrated to be stabilized on defect-free MoS2 overlayer supported on Ag(111) via the synergetic role of charge transfer among the Pd active sites, leading to superior catalytic performance to SAC-Pd1.

scholarly journals Hydroxyl improving the activity, selectivity and stability of supported Ni single atoms for selective semi-hydrogenation

2021 ◽  
Author(s):  
Minzhen Jian ◽  
Jin-Xun Liu ◽  
Wei-Xue Li
Keyword(s):  
Catalytic Performance ◽  
Single Atom ◽  
Hydroxyl Group ◽  
Single Atoms ◽  
Supported Ni

Hydroxyl group can stabilize significantly Ni single atom by forming Ni1(OH)2 complexes on anatase TiO2(101), which displays high catalytic performance in acetylene semi-hydrogenation.

Spatially Resolved and Quantitatively Revealed Charge Transfer between Single Atoms and Catalyst Supports

2021 ◽  
Author(s):  
Bin Di ◽  
Zhantao Peng ◽  
Zhongyi Wu ◽  
Xiong Zhou ◽  
Kai Wu
Keyword(s):  
Charge Transfer ◽  
Charge State ◽  
Catalytic Performance ◽  
Single Atom ◽  
Catalyst Supports ◽  
Single Atoms ◽  
Spatially Resolved

The charge state of supported single atoms is one of the most significant aspects determining the catalytic performance of single atom catalysts (SACs) which have drawn tremendous attention in recent...

scholarly journals UMA BREVE REVISÃO SOBRE A CATÁLISE POR ÁTOMOS ISOLADOS: CONCEITOS E APLICAÇÕES

Química Nova ◽  
2021 ◽  
Author(s):  
Luanne Ferreira ◽  
Ruan Ribeiro ◽  
Vinicius Madriaga ◽  
Sancler Vasconcelos ◽  
Eric Shimabukuro ◽  
...  
Keyword(s):  
Heterogeneous Catalysis ◽  
Homogeneous Catalysis ◽  
Industrial Revolution ◽  
Single Atom ◽  
Preparation Methods ◽  
High Exposure ◽  
Promising Alternative ◽  
Single Atoms ◽  
Catalytic Processes ◽  
Single Atom Alloys

A BRIEF OVERVIEW ON SINGLE-ATOM CATALYSIS: CONCEPTS AND APPLICATIONS. Catalytic processes became extremely important for the development of our society, especially after the second industrial revolution. Thus, the research for more efficient catalysts is an obstacle to overcome to achieve cheaper processes, higher yields, and selectivity of desired products. In this context, single-atom catalysis emerges as a promising alternative to unite the advantages of traditional homogeneous and heterogeneous catalysis. Catalysis by single-atoms is a bridge that unites in a single catalyst the ease of recovery and reuse (from heterogeneous catalysis) with the high exposure and uniformity of sites (from homogeneous catalysis). Thus, single-atom catalysts (SACs) and single-atom alloys (SAAs) have already found several applications in the literature, such as in hydrogenation, oxidation, conversion of biomass derivatives, electrocatalysis, and photocatalysis. However, it is essential to emphasize that it is still a field that is expanding and relatively new, with several opportunities and many barriers to surpass. In this review, concepts of homogeneous, enzymatic, and heterogeneous catalysis will be addressed, as well as fundamental aspects of single-atom catalysis, preparation methods, characterization, and current challenges.

scholarly journals Recent Advances in Rare Earth Complexes Containing N-Heterocyclic Carbenes: Synthesis, Reactivity, and Applications in Polymerization

Catalysts ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 71 ◽  
Author(s):  
Yu Pan ◽  
Xinxin Jiang ◽  
Yat-Ming So ◽  
Ching Tat To ◽  
Gaohong He
Keyword(s):  
Rare Earth ◽  
Catalytic Performance ◽  
Transition Metal Catalysts ◽  
Heterocyclic Carbenes ◽  
Unique Role ◽  
Ancillary Ligands ◽  
Grubbs Catalysts ◽  
Recent Developments ◽  
Metal Catalyzed

N-heterocyclic carbenes (NHCs) are ubiquitous ancillary ligands employed in metal-catalyzed homogeneous reactions and polymerization reactions. Of significance is the use of NHCs as the supporting ligand in second- and third-generation Grubbs catalysts for their application in olefin metathesis and ring-opening metathesis polymerization. While the applications of transition metal catalysts ligated with NHCs in polymerization chemistry are well-documented, the use of analogous rare earth (Ln = Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu) catalysts in this area remains under-developed, despite the unique role of rare earth elements in regio- and stereo-specific (co)polymerization reactions. By using hetero-atom-tethered chelating NHCs and, more recently, the employment of other structurally related NHCs, NHC-ligated Ln complexes have proven to be promising and fruitful catalysts for selective polymerization reactions. This review summarizes the recent developments in the coordination chemistry of Ln complexes containing NHCs and their catalytic performance in polymerization.

Theoretical study of the electrochemical reduction of CO2 on cerium dioxide supported palladium single atoms and nanoparticles

2021 ◽  
Author(s):  
Yan nv Guo ◽  
haiyan zhu ◽  
He Zhao ◽  
Qinfu Zhao ◽  
Caihua Zhou ◽  
...  
Keyword(s):  
Electrochemical Reduction ◽  
Cerium Dioxide ◽  
Theoretical Study ◽  
Catalytic Performance ◽  
Single Atom ◽  
Pd Nanoparticle ◽  
Single Atoms ◽  
Nanoparticle Clusters ◽  
Supported Palladium ◽  
Reduction Of Co2

Pd/CeO2 catalysts show superior catalytic performance owing to their optimal cycling activity and stability. In this study, single-atom Pd and eight-atoms Pd nanoparticle clusters were supported on the surface of...

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