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Alidoust S, Zamani M, Jabbari M. Adsorption of free radical TEMPO onto Al 2O 3 nanoparticles and evaluation of radical scavenging activity. Free Radic Res 2021; 55:937-949. [PMID: 34525892 DOI: 10.1080/10715762.2021.1981543] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
This study describes the adsorption of free radical TEMPO onto Al2O3 nanoparticles in the solvents with different polarities including DMF, methanol, acetone, THF, petroleum ether and n-hexane at ambient temperature to evaluate the radical scavenging activity. The adsorption percentage of radical is calculated by measuring the maximum adsorption intensity of the ultraviolet (UV) absorption spectrum of TEMPO in the presence and the absence of Al2O3 nanoparticles. The morphology of Al2O3 nanoparticles before and after adsorption of TEMPO is studied using transmission electron microscopy (TEM), X-ray diffraction (XRD) and Fourier-transform infrared (FT-IR) spectroscopy. The adsorption energy and other thermochemical data for the adsorption of TEMPO over different active sites of Al2O3 are estimated via dispersion corrected density functional theory (DFT + Disp). The donor-acceptor interactions between Al2O3 and TEMPO are calculated using natural bond orbital (NBO) theory. It is found that Al2O3 nanoparticles have efficient radical scavenging activity (RSA) in the range of 50-72%. Approximately, a linear relationship between dielectric constant of solvent and the absorption percentage of TEMPO over Al2O3 nanoparticles is achieved. So that with decreasing the polarity of solvent, the adsorption of TEMPO onto Al2O3 nanoparticles is increased. The adsorption of TEMPO over Lewis acidic sites of Al2O3 is more favored than Brønsted acidic and basic sites. The comparison between experimental and calculated IR spectra of TEMPO/Al2O3 complexes provides the good evidence for adsorption of TEMPO onto the surface of Al2O3 nanoparticles.
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Affiliation(s)
- Soheyl Alidoust
- School of Chemistry, Damghan University, Damghan 36716-41167, Iran
| | - Mehdi Zamani
- School of Chemistry, Damghan University, Damghan 36716-41167, Iran
| | - Morteza Jabbari
- School of Chemistry, Damghan University, Damghan 36716-41167, Iran
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Coan PD, Griffin MB, Ciesielski PN, Medlin JW. Phosphonic acid modifiers for enhancing selective hydrodeoxygenation over Pt catalysts: The role of the catalyst support. J Catal 2019. [DOI: 10.1016/j.jcat.2019.03.011] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Zamani M, Moradi Delfani A, Jabbari M. Scavenging performance and antioxidant activity of γ-alumina nanoparticles towards DPPH free radical: Spectroscopic and DFT-D studies. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2018; 201:288-299. [PMID: 29758515 DOI: 10.1016/j.saa.2018.05.004] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2017] [Revised: 04/07/2018] [Accepted: 05/01/2018] [Indexed: 05/20/2023]
Abstract
The radical scavenging performance and antioxidant activity of γ-alumina nanoparticles towards 2,2-diphenyl-1-picrylhydrazyl (DPPH) free radical were investigated by spectroscopic and computational methods. The radical scavenging ability of γ-alumina nanoparticles in the media with different polarity (i.e. i-propanol and n-hexane) was evaluated by measuring the DPPH absorbance in UV-Vis absorption spectra. The structure and morphology of γ-alumina nanoparticles before and after adsorption of DPPH were studied using XRD, FT-IR and UV-Vis spectroscopic techniques. The adsorption of DPPH free radical on the clean and hydrated γ-alumina (1 1 0) surface was examined by dispersion corrected density functional theory (DFT-D) and natural bond orbital (NBO) calculations. Also, time-dependent density functional theory (TD-DFT) was used to predict the absorption spectra. The adsorption was occurred through the interaction of radical nitrogen N and NO2 groups of DPPH with the acidic and basic sites of γ-alumina surface. The high potential for the adsorption of DPPH radical on γ-alumina nanoparticles was investigated. Interaction of DPPH with Brønsted and Lewis acidic sites of γ-alumina was more favored than Brønsted basic sites. The following order for the adsorption of DPPH over the different active sites of γ-alumina was predicted: Brønsted base < Lewis acid < Brønsted acid. These results are of great significance for the environmental application of γ-alumina nanoparticles in order to remove free radicals.
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Affiliation(s)
- Mehdi Zamani
- School of Chemistry, Damghan University, Damghan 36716-41167, Iran.
| | | | - Morteza Jabbari
- School of Chemistry, Damghan University, Damghan 36716-41167, Iran
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Gnanamani MK, Jacobs G, Shafer WD, Davis BH. Dehydration of 2-Octanol over Ca-doped CeO2Catalysts. ChemCatChem 2017. [DOI: 10.1002/cctc.201601076] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Muthu Kumaran Gnanamani
- Center for Applied Energy Research; University of Kentucky; 2540 Research Park Dr Lexington KY 40511 USA
| | - Gary Jacobs
- Center for Applied Energy Research; University of Kentucky; 2540 Research Park Dr Lexington KY 40511 USA
| | - Wilson D. Shafer
- Center for Applied Energy Research; University of Kentucky; 2540 Research Park Dr Lexington KY 40511 USA
| | - Burtron H. Davis
- Center for Applied Energy Research; University of Kentucky; 2540 Research Park Dr Lexington KY 40511 USA
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Zhang S, Yu J, Li H, Mao D, Lu G. High-effective approach from amino acid esters to chiral amino alcohols over Cu/ZnO/Al2O3 catalyst and its catalytic reaction mechanism. Sci Rep 2016; 6:33196. [PMID: 27619990 PMCID: PMC5020414 DOI: 10.1038/srep33196] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2016] [Accepted: 08/23/2016] [Indexed: 11/09/2022] Open
Abstract
Developing the high-efficient and green synthetic method for chiral amino alcohols is an intriguing target. We have developed the Mg(2+)-doped Cu/ZnO/Al2O3 catalyst for hydrogenation of L-phenylalanine methyl ester to chiral L-phenylalaninol without racemization. The effect of different L-phenylalanine esters on this title reaction was studied, verifying that Cu/ZnO/Al2O3 is an excellent catalyst for the hydrogenation of amino acid esters to chiral amino alcohols. DFT calculation was used to study the adsorption of substrate on the catalyst, and showed that the substrate adsorbs on the surface active sites mainly by amino group (-NH2) absorbed on Al2O3, and carbonyl (C=O) and alkoxy (RO-) group oxygen absorbed on the boundary of Cu and Al2O3. This catalytic hydrogenation undergoes the formation of a hemiacetal intermediate and the cleavage of the C-O bond (rate-determining step) by reacting with dissociated H to obtain amino aldehyde and methanol ad-species. The former is further hydrogenated to amino alcohols, and the latter desorbs from the catalyst surface.
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Affiliation(s)
- Shuangshuang Zhang
- Research Institute of Applied Catalysis, School of Chemical and Environmental Engineering, Shanghai Institute of Technology, Shanghai 201418, China
| | - Jun Yu
- Research Institute of Applied Catalysis, School of Chemical and Environmental Engineering, Shanghai Institute of Technology, Shanghai 201418, China
| | - Huiying Li
- Research Institute of Applied Catalysis, School of Chemical and Environmental Engineering, Shanghai Institute of Technology, Shanghai 201418, China
| | - Dongsen Mao
- Research Institute of Applied Catalysis, School of Chemical and Environmental Engineering, Shanghai Institute of Technology, Shanghai 201418, China
| | - Guanzhong Lu
- Research Institute of Applied Catalysis, School of Chemical and Environmental Engineering, Shanghai Institute of Technology, Shanghai 201418, China
- Key Laboratory for Advanced Materials and Research Institute of Industrial catalysis, East China University of Science and Technology, Shanghai 200237, China
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Biswas S, Pramanik A, Sarkar P. Computational studies on the reactivity of alkyl halides over (Al2O3)n nanoclusters: an approach towards room temperature dehydrohalogenation. NANOSCALE 2016; 8:10205-10218. [PMID: 27124271 DOI: 10.1039/c6nr00841k] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The role of alumina nanoclusters as a catalyst on the reactivity of alkyl halides has been explored. The thermochemical data obtained from Density Functional Theory (DFT) calculations and the analyses of the transition structures reveal that, between the two competing reactions, elimination (via E2) versus dissociative addition (via SN2), elimination is the kinetically controlled one and thus at room temperature, olefin is the major product. The results are in excellent agreement with the recent experimental observation where more than 97% of ethylene is formed at room temperature with the reaction of ethyl fluoride over an alumina surface, although the dissociative addition product is being thermodynamically more stable. We have tried to rationalize the fact by using alumina clusters of different sizes as well as different alkyl halides having β-H for elimination. It has been shown that, during the elimination (E2) pathway, the transition structure is oriented in such a way that the eliminating halogen and the β-H are in the interacting position with the three-centered Al and two-centered O atoms, respectively, where the Lewis acid/base interaction is the main guiding factor. We have also shown a possible pathway for regenerating the catalyst. Finally, the possibility of the reactions has been tested in the presence of H2O to mimic the same on the hydrated alumina surface.
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Affiliation(s)
- Santu Biswas
- Department of Chemistry, Visva-Bharati University, Santiniketan-731235, India.
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DFT-driven multi-site microkinetic modeling of ethanol conversion to ethylene and diethyl ether on γ-Al2O3(1 1 1). J Catal 2015. [DOI: 10.1016/j.jcat.2014.12.024] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Kang M, DeWilde JF, Bhan A. Kinetics and Mechanism of Alcohol Dehydration on γ-Al2O3: Effects of Carbon Chain Length and Substitution. ACS Catal 2014. [DOI: 10.1021/cs501471r] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Minje Kang
- Department
of Chemical Engineering
and Materials Science, University of Minnesota—Twin Cities, 421 Washington
Avenue SE, Minneapolis, Minnesota 55455, United States
| | - Joseph F. DeWilde
- Department
of Chemical Engineering
and Materials Science, University of Minnesota—Twin Cities, 421 Washington
Avenue SE, Minneapolis, Minnesota 55455, United States
| | - Aditya Bhan
- Department
of Chemical Engineering
and Materials Science, University of Minnesota—Twin Cities, 421 Washington
Avenue SE, Minneapolis, Minnesota 55455, United States
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Christiansen MA, Mpourmpakis G, Vlachos DG. Density Functional Theory-Computed Mechanisms of Ethylene and Diethyl Ether Formation from Ethanol on γ-Al2O3(100). ACS Catal 2013. [DOI: 10.1021/cs4002833] [Citation(s) in RCA: 111] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Matthew A. Christiansen
- Department of Chemical
and Biomolecular Engineering,
Catalysis Center for Energy Innovation and Center for Catalytic Science
and Technology, University of Delaware,
Newark, Delaware 19716-3110, United States
| | - Giannis Mpourmpakis
- Department of Chemical
and Biomolecular Engineering,
Catalysis Center for Energy Innovation and Center for Catalytic Science
and Technology, University of Delaware,
Newark, Delaware 19716-3110, United States
| | - Dionisios G. Vlachos
- Department of Chemical
and Biomolecular Engineering,
Catalysis Center for Energy Innovation and Center for Catalytic Science
and Technology, University of Delaware,
Newark, Delaware 19716-3110, United States
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Roy S, Mpourmpakis G, Hong DY, Vlachos DG, Bhan A, Gorte RJ. Mechanistic Study of Alcohol Dehydration on γ-Al2O3. ACS Catal 2012. [DOI: 10.1021/cs300176d] [Citation(s) in RCA: 172] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | | | - Do-Young Hong
- Department
of Chemical Engineering
and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | | | - A. Bhan
- Department
of Chemical Engineering
and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - R. J. Gorte
- Department of Chemical & Biomolecular Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
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Wei ZZ, Li DC, Pang XY, Lv CQ, Wang GC. The Mechanism of Low-Temperature CO Oxidation on IB Group Metals and Metal Oxides. ChemCatChem 2011. [DOI: 10.1002/cctc.201100298] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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