1
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Synthesis of 3-chalcogenyl-indoles mediated by the safer reagent urea-hydrogen peroxide (UHP). Tetrahedron Lett 2023. [DOI: 10.1016/j.tetlet.2023.154446] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/18/2023]
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2
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Meng X, Zheng Q, Sun Y, Wang Q, Wang L, Yuan P, Song X, Miao Y. Quick Release of Hydrogen Peroxide from Carbamide Peroxide Promotes Apoptosis of A549 Lung Cancer Cells. ChemistrySelect 2022. [DOI: 10.1002/slct.202200922] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Xiangrui Meng
- TCM Regulating Metabolic Diseases Key Laboratory of Sichuan Province Hospital of Chengdu University of Traditional Chinese Medicine Chengdu China
| | - Qiao Zheng
- TCM Regulating Metabolic Diseases Key Laboratory of Sichuan Province Hospital of Chengdu University of Traditional Chinese Medicine Chengdu China
| | - Yuanyuan Sun
- Department of Cardio-Pulmonary Circulation Shanghai Pulmonary Hospital Tongji University School of Medicine Shanghai China
| | - Qian Wang
- Institute of Bismuth Science University of Shanghai for Science and Technology Shanghai China
| | - Lan Wang
- Department of Cardio-Pulmonary Circulation Shanghai Pulmonary Hospital Tongji University School of Medicine Shanghai China
| | - Ping Yuan
- Department of Cardio-Pulmonary Circulation Shanghai Pulmonary Hospital Tongji University School of Medicine Shanghai China
| | - Xiao Song
- Department of Cardio-Pulmonary Circulation Shanghai Pulmonary Hospital Tongji University School of Medicine Shanghai China
| | - Yuqing Miao
- Institute of Bismuth Science University of Shanghai for Science and Technology Shanghai China
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3
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Wang J, Niu Q, Liu G, Si C, Lv Z, Han H, Liu Q, Jin M. Engineering Dandelion-Like Hollow TS-1@SiO2: Structural Design and Oxidation Application. Catal Letters 2022. [DOI: 10.1007/s10562-022-04005-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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4
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5
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Wang X, Wei W, Hu J, Li S, Wang Y, Yin L, Kong X, Feng Q. Remarkably enhanced ion-exchange capacity of H 2O 2-intercalated layered titanate. Chem Commun (Camb) 2021; 57:7394-7397. [PMID: 34223841 DOI: 10.1039/d1cc01387d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
H2O2-intercalated layered titanate H1.07Ti1.73O4 (H2O2-HTO) exhibits a dramatically enhanced ion-exchange capacity and remarkably improved reaction rate with various divalent cations. The intercalation can increase the negative charge density of the TiO6 octahedral layer and the number of ion-exchangeable H+ by forming a Ti(iv)-O-O-H bond that is the driving force to change the ion exchange performance.
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Affiliation(s)
- Xing Wang
- School of Materials Science and Engineering, Shaanxi University of Science and Technology, Weiyang, Xi'an, Shaanxi 710021, P. R. China. and Department of Advanced Materials Science, Faculty of Engineering, Kagawa University, Hayashi-cho 2217-20, Takamatsu-Shi, 761-0396, Japan
| | - Wei Wei
- Oil and Gas Technology Research Institute Changqing Oilfield Branch Company of PetroChina, National Engineering Laboratory for Exploration and Development of Low-Permeability Oil & Gasfields, Weiyang, Xi'an, Shaanxi 710018, P. R. China
| | - Jiaqiao Hu
- Department of Advanced Materials Science, Faculty of Engineering, Kagawa University, Hayashi-cho 2217-20, Takamatsu-Shi, 761-0396, Japan
| | - Sen Li
- Department of Advanced Materials Science, Faculty of Engineering, Kagawa University, Hayashi-cho 2217-20, Takamatsu-Shi, 761-0396, Japan
| | - Yong Wang
- School of Materials Science and Engineering, Shaanxi University of Science and Technology, Weiyang, Xi'an, Shaanxi 710021, P. R. China.
| | - Lixiong Yin
- School of Materials Science and Engineering, Shaanxi University of Science and Technology, Weiyang, Xi'an, Shaanxi 710021, P. R. China.
| | - Xingang Kong
- School of Materials Science and Engineering, Shaanxi University of Science and Technology, Weiyang, Xi'an, Shaanxi 710021, P. R. China.
| | - Qi Feng
- School of Materials Science and Engineering, Shaanxi University of Science and Technology, Weiyang, Xi'an, Shaanxi 710021, P. R. China.
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6
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Tong W, Yin J, Ding L, Xu H, Wu P. Modified Ti-MWW Zeolite as a Highly Efficient Catalyst for the Cyclopentene Epoxidation Reaction. Front Chem 2020; 8:585347. [PMID: 33195081 PMCID: PMC7581914 DOI: 10.3389/fchem.2020.585347] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2020] [Accepted: 08/31/2020] [Indexed: 11/18/2022] Open
Abstract
The liquid-phase epoxidation of cyclopentene (CPE) was performed in the Ti-zeolite/H2O2 catalytic system for the clean synthesis of cyclopentene oxide. Among all the Ti-zeolites (Ti-Beta, Ti-MOR, Ti-MCM-68, TS-1, TS-2, and Ti-MWW) investigated in the present study, Ti-MWW provided relatively lower CPE conversion of 13% due to the diffusion constrains but a higher CPO selectivity of 99.5%. The catalytic performance of Ti-MWW was significantly enhanced by piperidine (PI) treatment, with the CPE conversion and CPO selectivity increased to 97.8 and 99.9%, respectively. The structural rearrangement upon PI treatment converted the 3-dimensional (3D) MWW structure to a 2D lamellar one, which enlarged the interlayer space and greatly alleviated the diffusion constrains of cyclic cyclopentene. Furthermore, the newly constructed “open site” six-coordinated Ti active sites with PI as the ligand exhibited higher catalytic activity. The two factors contributed to more significant enhancement of the activity upon PI-assisted structural arrangement compared to the cases in linear alkenes.
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Affiliation(s)
- Wen Tong
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, China
| | - Jinpeng Yin
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, China
| | - Luoyi Ding
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, China
| | - Hao Xu
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, China
| | - Peng Wu
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, China
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7
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Zhang Z, Zhao X, Wang G, Xu J, Lu M, Tang Y, Fu W, Duan X, Qian G, Chen D, Zhou X. Uncalcined TS‐2 immobilized Au nanoparticles as a bifunctional catalyst to boost direct propylene epoxidation with H
2
and O
2. AIChE J 2019. [DOI: 10.1002/aic.16815] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Zhihua Zhang
- State Key Laboratory of Chemical Engineering East China University of Science and Technology Shanghai China
| | - Xuan Zhao
- State Key Laboratory of Chemical Engineering East China University of Science and Technology Shanghai China
| | - Gang Wang
- State Key Laboratory of Chemical Engineering East China University of Science and Technology Shanghai China
| | - Jialun Xu
- State Key Laboratory of Chemical Engineering East China University of Science and Technology Shanghai China
| | - Mengke Lu
- State Key Laboratory of Chemical Engineering East China University of Science and Technology Shanghai China
| | - Yanqiang Tang
- State Key Laboratory of Chemical Engineering East China University of Science and Technology Shanghai China
| | - Wenzhao Fu
- State Key Laboratory of Chemical Engineering East China University of Science and Technology Shanghai China
| | - Xuezhi Duan
- State Key Laboratory of Chemical Engineering East China University of Science and Technology Shanghai China
| | - Gang Qian
- State Key Laboratory of Chemical Engineering East China University of Science and Technology Shanghai China
| | - De Chen
- Department of Chemical Engineering Norwegian University of Science and Technology Trondheim Norway
| | - Xinggui Zhou
- State Key Laboratory of Chemical Engineering East China University of Science and Technology Shanghai China
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8
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Nan M, Luo Y, Li G, Hu C. Improvement of the selectivity to aniline in benzene amination over Cu/TS-1 by potassium. RSC Adv 2017. [DOI: 10.1039/c7ra02074k] [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] Open
Abstract
Two different methods of introducing potassium into Cu/TS-1 were conducted and the catalysts obtained showed a rather different catalytic activity in the ammoxidation of benzene to aniline.
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Affiliation(s)
- Mi Nan
- Key Laboratory of Green Chemistry and Technology
- Ministry of Education
- College of Chemistry
- Sichuan University
- Chengdu
| | - Yuecheng Luo
- Key Laboratory of Green Chemistry and Technology
- Ministry of Education
- College of Chemistry
- Sichuan University
- Chengdu
| | - Guiying Li
- Key Laboratory of Green Chemistry and Technology
- Ministry of Education
- College of Chemistry
- Sichuan University
- Chengdu
| | - Changwei Hu
- Key Laboratory of Green Chemistry and Technology
- Ministry of Education
- College of Chemistry
- Sichuan University
- Chengdu
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9
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Sarmah B, Srivastava R, Satpati B. Highly Efficient Silver Nanoparticles Supported Nanocrystalline Zirconosilicate Catalyst for the Epoxidation and Hydration Reactions. ChemistrySelect 2016. [DOI: 10.1002/slct.201600132] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Bhaskar Sarmah
- Department of Chemistry; Indian Institute of Technology Ropar; Rupnagar-140001 Punjab India
| | - Rajendra Srivastava
- Department of Chemistry; Indian Institute of Technology Ropar; Rupnagar-140001 Punjab India
| | - Biswarup Satpati
- Surface Physics Division; Saha Institute of Nuclear Physics; 1/AF, Bidhannagar Kolkata 700 064 India
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10
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Fengjuan Yang, Zhang X, Li F, Wang Z, Wang L. Chemoenzymatic Synthesis of α-Cyano Epoxides by a Tandem-Knoevenagel-Epoxidation Reaction. European J Org Chem 2016. [DOI: 10.1002/ejoc.201501501] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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11
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Wilde N, Přech J, Pelz M, Kubů M, Čejka J, Gläser R. Accessibility enhancement of TS-1-based catalysts for improving the epoxidation of plant oil-derived substrates. Catal Sci Technol 2016. [DOI: 10.1039/c6cy01232a] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
TS-1-based catalysts with different textural features, namely layered TS-1, pillared TS-1, and Ti-pillared TS-1 as well as mesoporous TS-1, were investigated in the liquid-phase epoxidation of methyl oleate as a model compound for plant oil-derived substrates with hydrogen peroxide at 50 °C.
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Affiliation(s)
- Nicole Wilde
- Institute of Chemical Technology
- Universität Leipzig
- 04103 Leipzig
- Germany
| | - Jan Přech
- J. Heyrovský Institute of Physical Chemistry
- Academy of Sciences of the Czech Republic
- 182 23 Prague 8
- Czech Republic
| | - Marika Pelz
- Institute of Chemical Technology
- Universität Leipzig
- 04103 Leipzig
- Germany
| | - Martin Kubů
- J. Heyrovský Institute of Physical Chemistry
- Academy of Sciences of the Czech Republic
- 182 23 Prague 8
- Czech Republic
| | - Jiří Čejka
- J. Heyrovský Institute of Physical Chemistry
- Academy of Sciences of the Czech Republic
- 182 23 Prague 8
- Czech Republic
| | - Roger Gläser
- Institute of Chemical Technology
- Universität Leipzig
- 04103 Leipzig
- Germany
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12
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Kim J, Chun J, Ryoo R. MFI zeolite nanosheets with post-synthetic Ti grafting for catalytic epoxidation of bulky olefins using H2O2. Chem Commun (Camb) 2015; 51:13102-5. [DOI: 10.1039/c5cc04510j] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The external surfaces of the surfactant-directed, 2.5 nm MFI zeolite nanosheets were grafted with Ti using titanium(iv) butoxide.
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Affiliation(s)
- Jaeheon Kim
- Department of Chemistry
- KAIST
- Daejeon 305-701
- Korea
- Center for Nanomaterials and Chemical Reactions
| | - Joonsoo Chun
- Department of Chemistry
- KAIST
- Daejeon 305-701
- Korea
- Center for Nanomaterials and Chemical Reactions
| | - Ryong Ryoo
- Department of Chemistry
- KAIST
- Daejeon 305-701
- Korea
- Center for Nanomaterials and Chemical Reactions
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13
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Gallo A, Tiozzo C, Psaro R, Carniato F, Guidotti M. Niobium metallocenes deposited onto mesoporous silica via dry impregnation as catalysts for selective epoxidation of alkenes. J Catal 2013. [DOI: 10.1016/j.jcat.2012.11.015] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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14
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Novara C, Alfayate A, Berlier G, Maurelli S, Chiesa M. The interaction of H2O2 with TiAlPO-5 molecular sieves: probing the catalytic potential of framework substituted Ti ions. Phys Chem Chem Phys 2013; 15:11099-105. [DOI: 10.1039/c3cp51214b] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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15
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Kuo FT, Chen SY, Lin TH, Lee JF, Cheng S. Effect of combination sequence of precursors on the structural and catalytic properties of Ti–SBA-15. RSC Adv 2013. [DOI: 10.1039/c3ra41304g] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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16
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Epoxidation of propylene to propylene oxide catalyzed by large-grain TS-1 in supercritical CO2. ACTA ACUST UNITED AC 2012. [DOI: 10.1016/j.molcata.2011.10.020] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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17
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Chen SY, Tang CY, Lee JF, Jang LY, Tatsumi T, Cheng S. Effect of calcination on the structure and catalytic activities of titanium incorporated SBA-15. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c0jm03111a] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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18
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Shan Z, Lu Z, Wang L, Zhou C, Ren L, Zhang L, Meng X, Ma S, Xiao FS. Stable Bulky Particles Formed by TS-1 Zeolite Nanocrystals in the Presence of H2O2. ChemCatChem 2010. [DOI: 10.1002/cctc.200900312] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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19
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Boz İ, Kerkez Ö. Effects of boehmite synthesis conditions on the epoxidation of styrene. REACTION KINETICS MECHANISMS AND CATALYSIS 2010. [DOI: 10.1007/s11144-010-0177-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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20
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Huang J, Akita T, Faye J, Fujitani T, Takei T, Haruta M. Propene epoxidation with dioxygen catalyzed by gold clusters. Angew Chem Int Ed Engl 2009; 48:7862-6. [PMID: 19757468 DOI: 10.1002/anie.200903011] [Citation(s) in RCA: 180] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Jiahui Huang
- Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minami-osawa, Hachioji, Tokyo 192-0397, Japan
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21
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Huang J, Akita T, Faye J, Fujitani T, Takei T, Haruta M. Propene Epoxidation with Dioxygen Catalyzed by Gold Clusters. Angew Chem Int Ed Engl 2009. [DOI: 10.1002/ange.200903011] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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22
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Highly Selective Epoxidation of α-Pinene and Cinnamyl Chloride with Dry Air over Nanosized Metal Oxides. Catal Letters 2009. [DOI: 10.1007/s10562-009-9943-9] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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23
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24
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Highly Active/Selective Heterogeneous Catalyst Co/Ts-1 for Epoxidation of Styrene by Molecular Oxygen: Effects of Catalyst Preparation Conditions and Reaction Conditions on the Reaction. Catal Letters 2007. [DOI: 10.1007/s10562-007-9273-8] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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25
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Jinka KM, Sebastian J, Jasra RV. Epoxidation of cycloalkenes with cobalt(II)-exchanged zeolite X catalysts using molecular oxygen. ACTA ACUST UNITED AC 2007. [DOI: 10.1016/j.molcata.2007.04.029] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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26
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Chowdhury B, Bravo-Suarez JJ, Mimura N, Lu J, Bando KK, Tsubota S, Haruta M. In Situ UV−vis and EPR Study on the Formation of Hydroperoxide Species during Direct Gas Phase Propylene Epoxidation over Au/Ti-SiO2 Catalyst. J Phys Chem B 2006; 110:22995-9. [PMID: 17107135 DOI: 10.1021/jp066008y] [Citation(s) in RCA: 123] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
In recent years, there have been great experimental and theoretical advances in the understanding of the epoxidation of propylene by O(2) and H(2) over Au supported on titanium-containing oxidic supports; however, thus far spectroscopic evidence of reacting species for proposed mechanisms has been lacking. Hydroperoxide species have been postulated as an intermediate responsible for the epoxidation of propylene with O(2) and H(2). In order to obtain direct evidence for the different type of active oxygen species, in situ UV-vis and EPR measurements were carried out during the epoxidation of propylene with O(2) and H(2) over a Au/Ti-SiO(2) (Ti/Si = 3:100) catalyst. It was determined that the adsorbed species of oxygen (O(2)(-)) resided on Au, more likely at a perimeter site, and it led to the formation of titanium hydroperoxo species. These results support the possible mechanism of formation of these hydroperoxo species via H(2)O(2) produced from O(2) and H(2) adsorbed on the Au surfaces.
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27
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Welch A, Shiju NR, Watts ID, Sankar G, Nikitenko S, Bras W. Epoxidation of Cyclohexene over Crystalline and Amorphous Titanosilicate Catalysts. Catal Letters 2005. [DOI: 10.1007/s10562-005-8688-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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28
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Zhuang J, Yang G, Ma D, Lan X, Liu X, Han X, Bao X, Mueller U. In situ magnetic resonance investigation of styrene oxidation over TS-1 zeolites. Angew Chem Int Ed Engl 2005; 43:6377-81. [PMID: 15558681 DOI: 10.1002/anie.200461113] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Jianqin Zhuang
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, P.R. China
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29
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Organotin-oxomolybdate coordination polymers as catalysts for the epoxidation of cyclooctene. ACTA ACUST UNITED AC 2005. [DOI: 10.1016/j.molcata.2005.05.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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30
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Ghadiri M, Farzaneh F, Ghandi M, Alizadeh M. Immobilized copper(II) complexes on montmorillonite and MCM-41 as selective catalysts for epoxidation of alkenes. ACTA ACUST UNITED AC 2005. [DOI: 10.1016/j.molcata.2005.01.046] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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31
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Raj NK, Ramaswamy A, Manikandan P. Oxidation of norbornene over vanadium-substituted phosphomolybdic acid catalysts and spectroscopic investigations. ACTA ACUST UNITED AC 2005. [DOI: 10.1016/j.molcata.2004.10.005] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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32
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Zhuang J, Yang G, Ma D, Lan X, Liu X, Han X, Bao X, Mueller U. In Situ Magnetic Resonance Investigation of Styrene Oxidation over TS-1 Zeolites. Angew Chem Int Ed Engl 2004. [DOI: 10.1002/ange.200461113] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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33
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Selective epoxidation of cyclohexene to cyclohexene oxide catalyzed by Keggin-type heteropoly compounds using anhydrous urea–hydrogen peroxide as oxidizing reagent and acetonitrile as the solvent. ACTA ACUST UNITED AC 2004. [DOI: 10.1016/j.molcata.2004.04.019] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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34
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Active Sites and Reactive Intermediates in Titanium Silicate Molecular Sieves. ADVANCES IN CATALYSIS 2004. [DOI: 10.1016/s0360-0564(04)48001-8] [Citation(s) in RCA: 139] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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35
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Murugavel R, Davis P, Shete VS. Reactivity studies, structural characterization, and thermolysis of cubic titanosiloxanes: precursors to titanosilicate materials which catalyze olefin epoxidation. Inorg Chem 2003; 42:4696-706. [PMID: 12870961 DOI: 10.1021/ic034317m] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The cubic titanosiloxane [RSiO(3)Ti(OPr(i))](4) (R = 2,6-Pr(2)(i)C(6)H(3)NSiMe(3)) (1) is found to be relatively inert in its attempted reactions with alcohols and other acidic hydrogen containing compounds. The reaction of 1 with silanol (Bu(t)O)(3)SiOH however proceeds over a period of approximately 3 months to result in the hydrolysis of (Bu(t)O)(3)SiOH and yield the transesterification product [RSiO(3)Ti(OBu(t))](4) (2) rather than the expected [RSiO(3)Ti(OSi(OBu(t))(3))](4). Products 1 and 2 have been characterized by elemental analysis, thermal analysis, and spectroscopic techniques (IR, EI-MS, and NMR). The solid-state structures of both 1 and 2 have been determined by single-crystal X-ray diffraction studies. Compounds 1 and 2 are isomorphous and crystallize in a cubic space group with a central cubic Ti(4)Si(4)O(12) core. Solid state thermolysis of 1 was carried at 450, 600, 800, 900, 1000, and 1200 degrees C in air, and the resulting titanosilicate materials 1a-f were characterized by spectroscopic (IR and DR UV), powder XRD, and electron microscopic methods. While, the presence of Ti-O-Si linkages appears to be dominant in the samples prepared at lower temperatures (450-800 degrees C), phase separation of anatase and rutile forms of TiO(2) occurs at temperatures above 900 degrees C as revealed by IR spectral and PXRD studies. The presence of octahedral titanium centers was observed by DR UV spectroscopy for the samples heated at higher temperatures. The use of new titanosilicate materials as catalysts for olefin epoxidation has been investigated. The titanosilicate materials produced at temperatures below 800 degrees C with a large number of Ti-O-Si linkages (or tetrahedral titanium centers) were found to be more active catalysts compared to the materials produced above 900 degrees C. The observed conversion in the epoxidation reactions was found to be somewhat low although the selectivity of the epoxide formation over the other possible oxidized products was found to be very good.
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Affiliation(s)
- Ramaswamy Murugavel
- Department of Chemistry, Indian Institute of Technology-Bombay, Powai, Mumbai-400 076, India.
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