1
|
Ashraf M, Ahmad MS, Inomata Y, Ullah N, Tahir MN, Kida T. Transition metal nanoparticles as nanocatalysts for Suzuki, Heck and Sonogashira cross-coupling reactions. Coord Chem Rev 2023. [DOI: 10.1016/j.ccr.2022.214928] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
|
2
|
Zhao J, Wang J, Brock AJ, Zhu H. Plasmonic heterogeneous catalysis for organic transformations. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY C: PHOTOCHEMISTRY REVIEWS 2022. [DOI: 10.1016/j.jphotochemrev.2022.100539] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
3
|
Wu C, Bu J, Wang W, Shen H, Cao Y, Zhang H. Imine Synthesis by Benzylamine Self-Coupling Catalyzed by Cerium-Doped MnO 2 under Mild Conditions. Ind Eng Chem Res 2022. [DOI: 10.1021/acs.iecr.2c00311] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Chen Wu
- Research & Development Institute of Northwestern Polytechnical University in Shenzhen, Shenzhen 518057, PR China
- Xi’an Key Laboratory of Functional Organic Porous Materials, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi’an 710129, PR China
| | - Jun Bu
- Xi’an Key Laboratory of Functional Organic Porous Materials, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi’an 710129, PR China
| | - Wenbin Wang
- Xi’an Key Laboratory of Functional Organic Porous Materials, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi’an 710129, PR China
| | - Haidong Shen
- Research & Development Institute of Northwestern Polytechnical University in Shenzhen, Shenzhen 518057, PR China
- Xi’an Key Laboratory of Functional Organic Porous Materials, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi’an 710129, PR China
| | - Yueling Cao
- Research & Development Institute of Northwestern Polytechnical University in Shenzhen, Shenzhen 518057, PR China
- Xi’an Key Laboratory of Functional Organic Porous Materials, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi’an 710129, PR China
- Chongqing Science and Technology Innovation Center of Northwestern Polytechnical University, Chongqing 401135, PR China
| | - Hepeng Zhang
- Research & Development Institute of Northwestern Polytechnical University in Shenzhen, Shenzhen 518057, PR China
- Xi’an Key Laboratory of Functional Organic Porous Materials, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi’an 710129, PR China
| |
Collapse
|
4
|
Yamamoto Y, Ota M, Kodama S, Ueshima M, Nomoto A, Ogawa A, Furuya M, Kawakami K. Excellent Catalytic Performances of a Au/C-CuO Binary System in the Selective Oxidation of Benzylamines to Imines under Atmospheric Oxygen. ACS OMEGA 2021; 6:34339-34346. [PMID: 34963919 PMCID: PMC8697021 DOI: 10.1021/acsomega.1c04046] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/29/2021] [Accepted: 11/03/2021] [Indexed: 06/14/2023]
Abstract
A green method of the oxidation of benzylamines to imines was developed using a novel binary system of Au/C-CuO. This system was evaluated under atmospheric oxygen, and the corresponding imines were obtained in up to 100% yields by loading 0.006 mol % of Au/C and 1.25 mol % of CuO under mild conditions. This system was also successfully applied to the syntheses of N-containing functional molecules, as well as that of imines on the scale of several grams. Furthermore, the turnover number of the system (more than 8000 times on a gold basis) as well as its ability to be reused more than 10 times for benzylamine oxidation demonstrates the excellent durability and recyclability of the developed system.
Collapse
Affiliation(s)
- Yuki Yamamoto
- Department
of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Nakaku, Sakai, Osaka 599-8531, Japan
| | - Miyuto Ota
- Department
of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Nakaku, Sakai, Osaka 599-8531, Japan
| | - Shintaro Kodama
- Department
of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Nakaku, Sakai, Osaka 599-8531, Japan
| | - Michio Ueshima
- Department
of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Nakaku, Sakai, Osaka 599-8531, Japan
| | - Akihiro Nomoto
- Department
of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Nakaku, Sakai, Osaka 599-8531, Japan
| | - Akiya Ogawa
- Department
of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Nakaku, Sakai, Osaka 599-8531, Japan
| | - Mitsunori Furuya
- Science
& Innovation Center, Mitsubishi Chemical
Corporation, 1000 Kamoshida-cho, Aoba-ku, Yokohama-shi, Kanagawa 227-8502, Japan
| | - Kiminori Kawakami
- Science
& Innovation Center, Mitsubishi Chemical
Corporation, 1000 Kamoshida-cho, Aoba-ku, Yokohama-shi, Kanagawa 227-8502, Japan
| |
Collapse
|
5
|
Huang X, Zhang K, Peng B, Wang G, Muhler M, Wang F. Ceria-Based Materials for Thermocatalytic and Photocatalytic Organic Synthesis. ACS Catal 2021. [DOI: 10.1021/acscatal.1c02443] [Citation(s) in RCA: 47] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Xiubing Huang
- Beijing Key Laboratory of Function Materials for Molecule & Structure Construction, School of Materials Science and Engineering, University of Science and Technology Beijing, No. 30 Xueyuan Road, Beijing 10083, PR China
| | - Kaiyue Zhang
- Beijing Key Laboratory of Function Materials for Molecule & Structure Construction, School of Materials Science and Engineering, University of Science and Technology Beijing, No. 30 Xueyuan Road, Beijing 10083, PR China
| | - Baoxiang Peng
- Laboratory of Industrial Chemistry, Faculty of Chemistry and Biochemistry, Ruhr-University Bochum, Universitätsstrasse 150, 44780 Bochum, Nordrhein-Westfalen, Germany
- Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34−36, 45470 Mülheim an der Ruhr, Nordrhein-Westfalen, Germany
| | - Ge Wang
- Beijing Key Laboratory of Function Materials for Molecule & Structure Construction, School of Materials Science and Engineering, University of Science and Technology Beijing, No. 30 Xueyuan Road, Beijing 10083, PR China
| | - Martin Muhler
- Laboratory of Industrial Chemistry, Faculty of Chemistry and Biochemistry, Ruhr-University Bochum, Universitätsstrasse 150, 44780 Bochum, Nordrhein-Westfalen, Germany
- Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34−36, 45470 Mülheim an der Ruhr, Nordrhein-Westfalen, Germany
| | - Feng Wang
- State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, Liaoning 116023, PR China
| |
Collapse
|
6
|
Structure–Activity Relationships of WOx-Promoted TiO2–ZrO2 Solid Acid Catalyst for Acetalization and Ketalization of Glycerol towards Biofuel Additives. Catal Letters 2021. [DOI: 10.1007/s10562-021-03733-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
|
7
|
Sudarsanam P, Köckritz A, Atia H, Amin MH, Brückner A. Synergistic Nanostructured MnO
x
/TiO
2
Catalyst for Highly Selective Synthesis of Aromatic Imines. ChemCatChem 2021. [DOI: 10.1002/cctc.202001870] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Putla Sudarsanam
- Leibniz Institute for Catalysis e.V. (LIKAT) Albert-Einstein-Str. 29a 18059 Rostock Germany
- Catalysis and Inorganic Chemistry Division CSIR-National Chemical Laboratory Dr Homi Bhabha Road, Pashan Pune 411008 India
| | - Angela Köckritz
- Leibniz Institute for Catalysis e.V. (LIKAT) Albert-Einstein-Str. 29a 18059 Rostock Germany
| | - Hanan Atia
- Leibniz Institute for Catalysis e.V. (LIKAT) Albert-Einstein-Str. 29a 18059 Rostock Germany
| | | | - Angelika Brückner
- Leibniz Institute for Catalysis e.V. (LIKAT) Albert-Einstein-Str. 29a 18059 Rostock Germany
| |
Collapse
|
8
|
|
9
|
Zhao C, Gao Y, Zhang Z, Ma D. Functions of Phytic Acid in Fabricating
Metal‐Free
Carbocatalyst for Oxidative Coupling of Benzylamines
†. CHINESE J CHEM 2020. [DOI: 10.1002/cjoc.202000145] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Chuanchuan Zhao
- Key Laboratory of Medicinal Chemistry and Molecular Diagnosis of Ministry of Education, College of Chemistry and Environmental Science, Hebei University Baoding Hebei 071002 China
| | - Yongjun Gao
- Key Laboratory of Medicinal Chemistry and Molecular Diagnosis of Ministry of Education, College of Chemistry and Environmental Science, Hebei University Baoding Hebei 071002 China
| | - Ziyi Zhang
- Key Laboratory of Medicinal Chemistry and Molecular Diagnosis of Ministry of Education, College of Chemistry and Environmental Science, Hebei University Baoding Hebei 071002 China
| | - Ding Ma
- Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering and College of Engineering, and BIC‐ESAT, Peking University Beijing 100871 China
| |
Collapse
|
10
|
Deka H, Kumar A, Patra S, Awasthi MK, Singh SK. Synthesis, structure and catalytic activity of manganese(ii) complexes derived from bis(imidazole)methane-based ligands. Dalton Trans 2020; 49:757-763. [PMID: 31850439 DOI: 10.1039/c9dt03886h] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
New mononuclear manganese(ii) complexes [Mn(κ2-L1)(OAc)2] ([Mn]-1), [Mn(κ2-L2)(OAc)2] ([Mn]-2) and [Mn(κ2-L3)(OAc)2] ([Mn]-3) with imidazole based ligands {4,4'-(phenylmethylene)bis(2-ethyl-5-methyl-1H-imidazole)} (L1), {(4,4'-((2-methoxy phenyl)methylene)bis(2-ethyl-5-methyl-1H-imidazole)} (L2) and {4,4'-((2-chlorophenyl) methylene)bis(2-ethyl-5-methyl-1H-imidazole)} (L3) are synthesized and fully characterized by a variety of techniques. Furthermore, the molecular structures of complexes [Mn]-1 and [Mn]-2 are established by single crystal X-ray structure analysis. The synthesized manganese(ii) complexes exhibited efficient catalytic oxidative coupling of primary amines in air under solvent-free conditions to the corresponding imines in moderate to good yields.
Collapse
Affiliation(s)
- Hemanta Deka
- Catalysis Group, Discipline of Chemistry, Indian Institute of Technology Indore, Simrol, Indore 453552, M.P., India.
| | | | | | | | | |
Collapse
|
11
|
Kim HJ, Lee G, Jang MG, Noh K, Han JW. Rational Design of Transition Metal Co‐Doped Ceria Catalysts for Low‐Temperature CO Oxidation. ChemCatChem 2019. [DOI: 10.1002/cctc.201900178] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Hyung Jun Kim
- Department of Chemical EngineeringPohang University of Science and Technology (POSTECH) Pohang Gyeongbuk 37673 Republic of Korea
| | - Geonhee Lee
- Department of Chemical EngineeringUniversity of Seoul Seoul 02504 Republic of Korea
| | - Myeong Gon Jang
- Department of Chemical EngineeringUniversity of Seoul Seoul 02504 Republic of Korea
| | - Kyung‐Jong Noh
- Department of Chemical EngineeringPohang University of Science and Technology (POSTECH) Pohang Gyeongbuk 37673 Republic of Korea
| | - Jeong Woo Han
- Department of Chemical EngineeringPohang University of Science and Technology (POSTECH) Pohang Gyeongbuk 37673 Republic of Korea
| |
Collapse
|
12
|
Sudarsanam P, Peeters E, Makshina EV, Parvulescu VI, Sels BF. Advances in porous and nanoscale catalysts for viable biomass conversion. Chem Soc Rev 2019; 48:2366-2421. [DOI: 10.1039/c8cs00452h] [Citation(s) in RCA: 318] [Impact Index Per Article: 63.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Solid catalysts with unique porosity and nanoscale properties play a promising role for efficient valorization of biomass into sustainable advanced fuels and chemicals.
Collapse
Affiliation(s)
- Putla Sudarsanam
- Centre for Surface Chemistry and Catalysis
- Faculty of Bioscience Engineering
- Heverlee
- Belgium
| | - Elise Peeters
- Centre for Surface Chemistry and Catalysis
- Faculty of Bioscience Engineering
- Heverlee
- Belgium
| | - Ekaterina V. Makshina
- Centre for Surface Chemistry and Catalysis
- Faculty of Bioscience Engineering
- Heverlee
- Belgium
| | - Vasile I. Parvulescu
- University of Bucharest
- Department of Organic Chemistry
- Biochemistry and Catalysis
- Bucharest 030016
- Romania
| | - Bert F. Sels
- Centre for Surface Chemistry and Catalysis
- Faculty of Bioscience Engineering
- Heverlee
- Belgium
| |
Collapse
|
13
|
Liu Y, Chen Y, Zhou W, Jiang B, Zhang X, Tian G. Hydrogenated Cu2O\Au@CeO2 Z-scheme catalyst for photocatalytic oxidation of amines to imines. Catal Sci Technol 2018. [DOI: 10.1039/c8cy01689e] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Hydrogenated Cu2O\Au@CeO2 Z-scheme yolk–shell photocatalysts have been prepared, which exhibited significantly enhanced visible light photocatalytic oxidation activity when converting amines to imines.
Collapse
Affiliation(s)
- Yingying Liu
- Key Laboratory of Functional Inorganic Material Chemistry
- Ministry of Education of the People's Republic of China
- School of Chemistry and Materials Science
- Heilongjiang University
- 150080 Harbin
| | - Yajie Chen
- Key Laboratory of Functional Inorganic Material Chemistry
- Ministry of Education of the People's Republic of China
- School of Chemistry and Materials Science
- Heilongjiang University
- 150080 Harbin
| | - Wei Zhou
- Key Laboratory of Functional Inorganic Material Chemistry
- Ministry of Education of the People's Republic of China
- School of Chemistry and Materials Science
- Heilongjiang University
- 150080 Harbin
| | - Baojiang Jiang
- Key Laboratory of Functional Inorganic Material Chemistry
- Ministry of Education of the People's Republic of China
- School of Chemistry and Materials Science
- Heilongjiang University
- 150080 Harbin
| | - Xin Zhang
- Key Laboratory of Functional Inorganic Material Chemistry
- Ministry of Education of the People's Republic of China
- School of Chemistry and Materials Science
- Heilongjiang University
- 150080 Harbin
| | - Guohui Tian
- Key Laboratory of Functional Inorganic Material Chemistry
- Ministry of Education of the People's Republic of China
- School of Chemistry and Materials Science
- Heilongjiang University
- 150080 Harbin
| |
Collapse
|
14
|
Rodríguez-Lugo RE, Chacón-Terán MA, De León S, Vogt M, Rosenthal AJ, Landaeta VR. Synthesis, characterization and Pd(ii)-coordination chemistry of the ligand tris(quinolin-8-yl)phosphite. Application in the catalytic aerobic oxidation of amines. Dalton Trans 2018; 47:2061-2072. [DOI: 10.1039/c7dt04000h] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
The ligand P(Oquin)3 is reported and was coordinated to Pd(ii). This complex is a catalyst precursor for the homocoupling of amines.
Collapse
Affiliation(s)
- R. E. Rodríguez-Lugo
- Universidad Simón Bolívar
- Departamento de Química
- Venezuela
- Laboratorio de Química Bioinorgánica
- Centro de Química
| | | | - S. De León
- Universidad Simón Bolívar
- Departamento de Química
- Venezuela
| | - M. Vogt
- Institut für Anorganische Chemie und Kristallographie
- Universität Bremen
- 28359 Bremen
- Germany
| | - A. J. Rosenthal
- Department of Chemistry and Applied Biosciences
- Eidgenössische Technische Hochschule Zürich
- 8093 Zürich
- Switzerland
| | - V. R. Landaeta
- Universidad Simón Bolívar
- Departamento de Química
- Venezuela
| |
Collapse
|
15
|
Valencia M, Pereira A, Müller-Bunz H, Belderraín TR, Pérez PJ, Albrecht M. Triazolylidene-Iridium Complexes with a Pendant Pyridyl Group for Cooperative Metal-Ligand Induced Catalytic Dehydrogenation of Amines. Chemistry 2017; 23:8901-8911. [DOI: 10.1002/chem.201700676] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2017] [Indexed: 01/14/2023]
Affiliation(s)
- Marta Valencia
- Department of Chemistry and Biochemistry; University of Bern; Freiestrasse 3 3012 Bern Switzerland
- School of Chemistry; University College Dublin, Belfield; Dublin 4 Ireland
| | - Ana Pereira
- School of Chemistry; University College Dublin, Belfield; Dublin 4 Ireland
- Laboratorio de Catálisis Homogénea; Unidad Asociada al CSIC; Centro de Investigación en Química Sostenible; Departamento de Química; Universidad de Huelva; 21007 Huelva Spain
| | - Helge Müller-Bunz
- School of Chemistry; University College Dublin, Belfield; Dublin 4 Ireland
| | - Tomás R. Belderraín
- Laboratorio de Catálisis Homogénea; Unidad Asociada al CSIC; Centro de Investigación en Química Sostenible; Departamento de Química; Universidad de Huelva; 21007 Huelva Spain
| | - Pedro J. Pérez
- Laboratorio de Catálisis Homogénea; Unidad Asociada al CSIC; Centro de Investigación en Química Sostenible; Departamento de Química; Universidad de Huelva; 21007 Huelva Spain
| | - Martin Albrecht
- Department of Chemistry and Biochemistry; University of Bern; Freiestrasse 3 3012 Bern Switzerland
- School of Chemistry; University College Dublin, Belfield; Dublin 4 Ireland
| |
Collapse
|
16
|
Simple hydrothermal synthesis of sphere-like TiO2 nanoparticles and their functionalization with 1,4-butane sultone as a new heterogeneous catalyst. JOURNAL OF THE IRANIAN CHEMICAL SOCIETY 2017. [DOI: 10.1007/s13738-017-1118-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
|
17
|
Kostera S, Wyrzykiewicz B, Pawluć P, Marciniec B. Ruthenium-catalyzed deaminative redistribution of primary and secondary amines. Dalton Trans 2017; 46:11552-11555. [DOI: 10.1039/c7dt02470c] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A ruthenium–hydride complex, [Ru(H)(Cl)(CO)(PCy3)2], was found to be active in the highly selective redistribution of primary and secondary amines bearing an α-hydrogen atom.
Collapse
Affiliation(s)
- S. Kostera
- Faculty of Chemistry
- Adam Mickiewicz University in Poznań
- 61-614 Poznań
- Poland
| | - B. Wyrzykiewicz
- Faculty of Chemistry
- Adam Mickiewicz University in Poznań
- 61-614 Poznań
- Poland
| | - P. Pawluć
- Faculty of Chemistry
- Adam Mickiewicz University in Poznań
- 61-614 Poznań
- Poland
| | - B. Marciniec
- Faculty of Chemistry
- Adam Mickiewicz University in Poznań
- 61-614 Poznań
- Poland
- Center for Advanced Technologies
| |
Collapse
|
18
|
Sudarsanam P, Hillary B, Mallesham B, Rao BG, Amin MH, Nafady A, Alsalme AM, Reddy BM, Bhargava SK. Designing CuOx Nanoparticle-Decorated CeO2 Nanocubes for Catalytic Soot Oxidation: Role of the Nanointerface in the Catalytic Performance of Heterostructured Nanomaterials. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:2208-2215. [PMID: 26886079 DOI: 10.1021/acs.langmuir.5b04590] [Citation(s) in RCA: 65] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
This work investigates the structure-activity properties of CuOx-decorated CeO2 nanocubes with a meticulous scrutiny on the role of the CuOx/CeO2 nanointerface in the catalytic oxidation of diesel soot, a critical environmental problem all over the world. For this, a systematic characterization of the materials has been undertaken using transmission electron microscopy (TEM), transmission electron microscopy-energy-dispersive X-ray spectroscopy (TEM-EDS), high-angle annular dark-field-scanning transmission electron microscopy (HAADF-STEM), scanning transmission electron microscopy-electron energy loss spectroscopy (STEM-EELS), X-ray diffraction (XRD), Raman, N2 adsorption-desorption, and X-ray photoelectron spectroscopy (XPS) techniques. The TEM images show the formation of nanosized CeO2 cubes (∼25 nm) and CuOx nanoparticles (∼8.5 nm). The TEM-EDS elemental mapping images reveal the uniform decoration of CuOx nanoparticles on CeO2 nanocubes. The XPS and Raman studies show that the decoration of CuOx on CeO2 nanocubes leads to improved structural defects, such as higher concentrations of Ce(3+) ions and abundant oxygen vacancies. It was found that CuOx-decorated CeO2 nanocubes efficiently catalyze soot oxidation at a much lower temperature (T50 = 646 K, temperature at which 50% soot conversion is achieved) compared to that of pristine CeO2 nanocubes (T50 = 725 K) under tight contact conditions. Similarly, a huge 91 K difference in the T50 values of CuOx/CeO2 (T50 = 744 K) and pristine CeO2 (T50 = 835 K) was found in the loose-contact soot oxidation studies. The superior catalytic performance of CuOx-decorated CeO2 nanocubes is mainly attributed to the improved redox efficiency of CeO2 at the nanointerface sites of CuOx-CeO2, as evidenced by Ce M5,4 EELS analysis, supported by XRD, Raman, and XPS studies, a clear proof for the role of nanointerfaces in the performance of heterostructured nanocatalysts.
Collapse
Affiliation(s)
- Putla Sudarsanam
- Centre for Advanced Materials and Industrial Chemistry (CAMIC), School of Applied Sciences, RMIT University , Melbourne, Victoria 3001, Australia
| | - Brendan Hillary
- Centre for Advanced Materials and Industrial Chemistry (CAMIC), School of Applied Sciences, RMIT University , Melbourne, Victoria 3001, Australia
| | - Baithy Mallesham
- Inorganic and Physical Chemistry Division, Council of Scientific and Industrial Research (CSIR)-Indian Institute of Chemical Technology , Uppal Road, Hyderabad, Telangana 500 007, India
| | - Bolla Govinda Rao
- Inorganic and Physical Chemistry Division, Council of Scientific and Industrial Research (CSIR)-Indian Institute of Chemical Technology , Uppal Road, Hyderabad, Telangana 500 007, India
| | - Mohamad Hassan Amin
- Centre for Advanced Materials and Industrial Chemistry (CAMIC), School of Applied Sciences, RMIT University , Melbourne, Victoria 3001, Australia
| | - Ayman Nafady
- Chemistry Department, College of Science, King Saud University , Riyadh 12372, Saudi Arabia
- Chemistry Department, Faculty of Science, Sohag University , Sohag 11432, Egypt
| | - Ali M Alsalme
- Chemistry Department, College of Science, King Saud University , Riyadh 12372, Saudi Arabia
| | - B Mahipal Reddy
- Inorganic and Physical Chemistry Division, Council of Scientific and Industrial Research (CSIR)-Indian Institute of Chemical Technology , Uppal Road, Hyderabad, Telangana 500 007, India
| | - Suresh K Bhargava
- Centre for Advanced Materials and Industrial Chemistry (CAMIC), School of Applied Sciences, RMIT University , Melbourne, Victoria 3001, Australia
| |
Collapse
|