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Luo J, Dong Y, Petit C, Liang C. Development of gold catalysts supported by unreducible materials: Design and promotions. CHINESE JOURNAL OF CATALYSIS 2021. [DOI: 10.1016/s1872-2067(20)63743-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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Luo J, Liu Y, Zhang L, Ren Y, Miao S, Zhang B, Su DS, Liang C. Atomic-Scale Observation of Bimetallic Au-CuO x Nanoparticles and Their Interfaces for Activation of CO Molecules. ACS APPLIED MATERIALS & INTERFACES 2019; 11:35468-35478. [PMID: 31483599 DOI: 10.1021/acsami.9b12017] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Supported gold nanoparticles with sizes below 5 nm display attractive catalytic activities for heterogeneous reactions, particularly those promoted by secondary metal (e.g., Cu) because of the well-defined synergy between metal compositions. However, the specific atomic structure at interfaces is less interpreted systematically. In this work, various bimetallic Au-CuOx catalysts with specific surface structures were synthesized and explored by aberration-corrected scanning transmission electron microscopy (AC-STEM), temperature-programmed experiments and in situ DRIFT experiments. Results suggest that the atomic structure and interfaces between gold and CuOx are determined by the nucleation behaviors of the nanoparticles and result in subsequently the distinctive ability for CO activation. Bimetallic CuO*/Au sample formatted by gold particles surrounded with CuOx nanoclusters have rough surface with prominently exposed low-coordinated Au step defects. Whereas the bimetallic Au@CuO sample formatted by copper precursor in the presence of gold nanoparticles have core-shell structure with relatively smooth surface. The former structure of CuO*/Au displays much accelerated properties for CO adsorption and activation with 90% CO converted to CO2 at 90 °C and nice stability with time on stream. The results clearly determine from atomic scale the significance of exposed gold step sites and intrinsic formation of defected surface by different nucleation. The above properties are directly responsible for the induced variation in chemical composition and the catalytic activity.
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Affiliation(s)
- Jingjie Luo
- State Key Laboratory of Fine Chemicals and Laboratory of Advanced Materials & Catalytic Engineering (AMCE), School of Chemical Engineering , Dalian University of Technology, Panjin Campus , Panjin 124221 , China
| | - Yuefeng Liu
- Dalian National Laboratory for Clean Energy (DNL), Dalian Institute of Chemical Physics , Chinese Academy of Sciences , 457 Zhongshan Road , Dalian 116023 , China
| | - Liyun Zhang
- Shenyang National Laboratory for Materials Science (SYNL), Institute of Metal Research , Chinese Academy of Science , 72 Wenhua Road , Shenyang 110016 , China
- Department of Chemical Engineering , Qufu Normal University , Qufu 273165 , China
| | - Yujing Ren
- Dalian National Laboratory for Clean Energy (DNL), Dalian Institute of Chemical Physics , Chinese Academy of Sciences , 457 Zhongshan Road , Dalian 116023 , China
| | - Shu Miao
- Dalian National Laboratory for Clean Energy (DNL), Dalian Institute of Chemical Physics , Chinese Academy of Sciences , 457 Zhongshan Road , Dalian 116023 , China
| | - Bingsen Zhang
- Shenyang National Laboratory for Materials Science (SYNL), Institute of Metal Research , Chinese Academy of Science , 72 Wenhua Road , Shenyang 110016 , China
| | - Dang Sheng Su
- Dalian National Laboratory for Clean Energy (DNL), Dalian Institute of Chemical Physics , Chinese Academy of Sciences , 457 Zhongshan Road , Dalian 116023 , China
| | - Changhai Liang
- State Key Laboratory of Fine Chemicals and Laboratory of Advanced Materials & Catalytic Engineering (AMCE), School of Chemical Engineering , Dalian University of Technology, Panjin Campus , Panjin 124221 , China
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da Silva AG, Rodrigues TS, Candido EG, de Freitas IC, da Silva AH, Fajardo HV, Balzer R, Gomes JF, Assaf JM, de Oliveira DC, Oger N, Paul S, Wojcieszak R, Camargo PH. Combining active phase and support optimization in MnO2-Au nanoflowers: Enabling high activities towards green oxidations. J Colloid Interface Sci 2018; 530:282-291. [DOI: 10.1016/j.jcis.2018.06.089] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2018] [Revised: 06/26/2018] [Accepted: 06/27/2018] [Indexed: 02/01/2023]
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Understanding the role of Ti-rich domains in the stabilization of gold nanoparticles on mesoporous silica-based catalysts. J Catal 2018. [DOI: 10.1016/j.jcat.2018.02.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Ru/FeO x catalyst performance design: Highly dispersed Ru species for selective carbon dioxide hydrogenation. CHINESE JOURNAL OF CATALYSIS 2018. [DOI: 10.1016/s1872-2067(17)62967-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Luo J, Liu Y, Niu Y, Jiang Q, Huang R, Zhang B, Su D. Insight into the chemical adsorption properties of CO molecules supported on Au or Cu and hybridized Au-CuO nanoparticles. NANOSCALE 2017; 9:15033-15043. [PMID: 28967010 DOI: 10.1039/c7nr06018a] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Although nanosized Au clusters have been well developed for many applications, fundamental understanding of their adsorption/activation behaviors in catalytic applications is still lacking, especially when other elements provide promotion or hybridization functions. Au hybridized with Cu element is a highly investigated system; Cu is in the same element group as Au and thus displays similar physicochemical properties. However, their hybrids are not well understood in terms of their chemical states and adsorption/activation properties. In this work, typical γ-Al2O3-supported Au and CuO as well as Au-CuO nanoparticles were prepared and characterized to explore their adsorption/activation properties in depth using CO as a probe molecule using advanced techniques, such as XPS, HR-TEM, temperature programmed experiments and operando DRIFT combined with mass spectra. It was found that gold and copper can both act as active sites during CO adsorption and activation. The CO-TPD and operando DRIFT results also revealed that CO molecules were able to react with surface oxygenated species, resulting in the direct formation of CO2 over the three samples in the absence of gaseous O2. The gold step sites (Austep) participated more readily in the reaction, especially under gaseous O2-free conditions. During adsorption, CO molecules were more preferentially adsorbed on Au0 sites at lower temperature comparing with those on the Cu0 sites. However, competitive adsorption occurred between CO adsorbed on Au0 and Cu0 with increased reaction temperature, and the synergy between the Au and Cu compositions was too strong to suppress the adsorption and activation of the CO molecules. The dynamic adsorption equilibrium over 120 °C to 200 °C resulted in the appearance of a hysteresis performance platform.
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Affiliation(s)
- Jingjie Luo
- Shenyang National Laboratory for Materials Science (SYNL), Institute of Metal Research, Chinese Academy of Science, 72 Wenhua Rd., Shenyang 110016, China.
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Luo J, Wei H, Liu Y, Zhang D, Zhang B, Chu W, Pham-Huu C, Su DS. Oxygenated group and structural defect enriched carbon nanotubes for immobilizing gold nanoparticles. Chem Commun (Camb) 2017; 53:12750-12753. [DOI: 10.1039/c7cc06594a] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Surface functionalized and defect enriched carbon nanotubes (oCNTs) by green ozone/H2O treatment can efficiently anchor gold nanoparticles.
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Affiliation(s)
- Jingjie Luo
- Shenyang National Laboratory for Materials Science (SYNL)
- Institute of Metal Research
- Chinese Academy of Science
- 110016 Shenyang
- China
| | - Hua Wei
- Shenyang National Laboratory for Materials Science (SYNL)
- Institute of Metal Research
- Chinese Academy of Science
- 110016 Shenyang
- China
| | - Yuefeng Liu
- Dalian National Laboratory for Clean Energy (DNL)
- Dalian Institute of Chemical Physics
- Chinese Academy of Sciences
- 116023 Dalian
- China
| | - Di Zhang
- Shenyang National Laboratory for Materials Science (SYNL)
- Institute of Metal Research
- Chinese Academy of Science
- 110016 Shenyang
- China
| | - Bingsen Zhang
- Shenyang National Laboratory for Materials Science (SYNL)
- Institute of Metal Research
- Chinese Academy of Science
- 110016 Shenyang
- China
| | - Wei Chu
- School of Chemical Engineering
- Sichuan University
- Chengdu 610065
- China
| | - Cuong Pham-Huu
- Institute of Chemical and Processes for Energy
- Environmental and Health (ICPEES)
- UMR 7515 CNRS
- University of Strasbourg
- 67087 Strasbourg cedex 02
| | - Dang Sheng Su
- Shenyang National Laboratory for Materials Science (SYNL)
- Institute of Metal Research
- Chinese Academy of Science
- 110016 Shenyang
- China
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Wang WJ, Qiu ZS, Zhong HY, Huang WA, Dai WH. Thermo-sensitive polymer nanospheres as a smart plugging agent for shale gas drilling operations. PETROLEUM SCIENCE 2016; 14:116-125. [PMID: 28239393 PMCID: PMC5306092 DOI: 10.1007/s12182-016-0140-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/24/2016] [Indexed: 06/06/2023]
Abstract
Emulsifier-free poly(methyl methacrylate-styrene) [P(MMA-St)] nanospheres with an average particle size of 100 nm were synthesized in an isopropyl alcohol-water medium by a solvothermal method. Then, through radical graft copolymerization of thermo-sensitive monomer N-isopropylacrylamide (NIPAm) and hydrophilic monomer acrylic acid (AA) onto the surface of P(MMA-St) nanospheres at 80 °C, a series of thermo-sensitive polymer nanospheres, named SD-SEAL with different lower critical solution temperatures (LCST), were prepared by adjusting the mole ratio of NIPAm to AA. The products were characterized by Fourier transform infrared spectroscopy, transmission electron microscopy, thermogravimetric analysis, particle size distribution, and specific surface area analysis. The temperature-sensitive behavior was studied by light transmittance tests, while the sealing performance was investigated by pressure transmission tests with Lungmachi Formation shales. The experimental results showed that the synthesized nanoparticles are sensitive to temperature and had apparent LCST values which increased with an increase in hydrophilic monomer AA. When the temperature was higher than its LCST value, SD-SEAL played a dual role of physical plugging and chemical inhibition, slowed down pressure transmission, and reduced shale permeability remarkably. The plugged layer of shale was changed to being hydrophobic, which greatly improved the shale stability.
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Affiliation(s)
- Wei-Ji Wang
- School of Petroleum Engineering, China University of Petroleum, Qingdao, 266580 Shandong China
| | - Zheng-Song Qiu
- School of Petroleum Engineering, China University of Petroleum, Qingdao, 266580 Shandong China
| | - Han-Yi Zhong
- School of Petroleum Engineering, China University of Petroleum, Qingdao, 266580 Shandong China
| | - Wei-An Huang
- School of Petroleum Engineering, China University of Petroleum, Qingdao, 266580 Shandong China
| | - Wen-Hao Dai
- School of Petroleum Engineering, China University of Petroleum, Qingdao, 266580 Shandong China
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