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Cr-Containing Rare-Earth Substituted Yttrium Iron Garnet Ferrites: Catalytic Properties in the Ethylbenzene Oxidation. Catalysts 2022. [DOI: 10.3390/catal12091033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
A series of the Cr-containing erbium substituted yttrium iron garnet ferrites (ECYIG) was synthesized with distinct Cr amounts, herein referred to as Y3(Er0.02Fe5Cr1−x)O12, where x refers to Cr amounts from 0 to 0.05. The catalytic performance of the solids was investigated in ethylbenzene oxidation in the presence of hydrogen peroxide to assess the role of Cr and Er present in the YIG garnet lattice for fine chemistry compound production. Raman spectroscopy, HRTEM, EPR and FTIR revealed that the insertion of Er (at a fixed amount of 2%) in dodecahedral sites had a great impact on the catalytic activity of the garnets. Both Er3+ and Y3+ in the lattice simultaneously provided structural stability to the garnet structure in any harsh environment. XPS and EPR indicated that the Cr3+ ions replaced those of Fe3+ located in both octahedral and tetrahedral sites of the YIG garnets. The Cr3+ ions acted as electronic promoter to increase the oxidation rate of the Fe3+ active species responsible for activating the EB molecule. SEM-EDS demonstrated that the solids having Cr amounts lower than 4% experienced the most severe deactivation due to the Cr leaching and strong carbon species adsorption on the surface of the catalysts, which decreased their efficiency in the reaction.
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do Carmo JVC, Lima CL, Mota G, Santos AMS, Costa LN, Ghosh A, Viana BC, Silva M, Soares JM, Tehuacanero-Cuapa S, Lang R, Oliveira AC, Rodríguez-Castellón E, Rodríguez-Aguado E. Effects of the Incorporation of Distinct Cations in Titanate Nanotubes on the Catalytic Activity in NO x Conversion. MATERIALS 2021; 14:ma14092181. [PMID: 33923161 PMCID: PMC8123014 DOI: 10.3390/ma14092181] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/05/2021] [Revised: 04/14/2021] [Accepted: 04/16/2021] [Indexed: 11/29/2022]
Abstract
Effects of the incorporation of Cr, Ni, Co, Ag, Al, Ni and Pt cations in titanate nanotubes (NTs) were examined on the NOx conversion. The structural and morphological characterizations evidenced that the ion-exchange reaction of Cr, Co, Ni and Al ions with the NTs produced catalysts with metals included in the interlayer regions of the trititanate NTs whereas an assembly of Ag and Pt nanoparticles were either on the nanotubes surface or inner diameters through an impregnation process. Understanding the role of the different metal cations intercalated or supported on the nanotubes, the optimal selective catalytic reduction of NOx by CO reaction (SCR) conditions was investigated by carrying out variations in the reaction temperature, SO2 and H2O poisoning and long-term stability runs. Pt nanoparticles on the NTs exhibited superior activity compared to the Cr, Co and Al intercalated in the nanotubes and even to the Ag and Ni counterparts. Resistance against SO2 poisoning was low on NiNT due to the trititanate phase transformation into TiO2 and also to sulfur deposits on Ni sites. However, the interaction between Pt2+ from PtOx and Ti4+ in the NTs favored the adsorption of both NOx and CO enhancing the catalytic performance.
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Affiliation(s)
- José Vitor C. do Carmo
- Department of Analytical and Chemical-Physic Chemistry, Pici Campus-Block 940, Federal University of Ceará, Fortaleza 60040-531, Brazil; (J.V.C.d.C.); (G.M.)
| | - Cleanio L. Lima
- Material Science and Engineering & Physics Department, Federal University of Piauí, Teresina 64049-550, Brazil; (C.L.L.); (A.M.S.S.); (L.N.C.); (A.G.); (B.C.V.)
| | - Gabriela Mota
- Department of Analytical and Chemical-Physic Chemistry, Pici Campus-Block 940, Federal University of Ceará, Fortaleza 60040-531, Brazil; (J.V.C.d.C.); (G.M.)
| | - Ariane M. S. Santos
- Material Science and Engineering & Physics Department, Federal University of Piauí, Teresina 64049-550, Brazil; (C.L.L.); (A.M.S.S.); (L.N.C.); (A.G.); (B.C.V.)
| | - Ludyane N. Costa
- Material Science and Engineering & Physics Department, Federal University of Piauí, Teresina 64049-550, Brazil; (C.L.L.); (A.M.S.S.); (L.N.C.); (A.G.); (B.C.V.)
| | - Anupama Ghosh
- Material Science and Engineering & Physics Department, Federal University of Piauí, Teresina 64049-550, Brazil; (C.L.L.); (A.M.S.S.); (L.N.C.); (A.G.); (B.C.V.)
| | - Bartolomeu C. Viana
- Material Science and Engineering & Physics Department, Federal University of Piauí, Teresina 64049-550, Brazil; (C.L.L.); (A.M.S.S.); (L.N.C.); (A.G.); (B.C.V.)
| | - Monique Silva
- Fortaleza Campus, Federal Institute of Education—IFCE, Av. 13 de Maio, 2081, Benfica, Fortaleza 60040-531, Brazil;
| | - João M. Soares
- Physics Department, State University of Rio Grande do Norte-UERN, BR 110-km 48, R. Prof. Antônio Campos, Costa e Silva, Mossoró 59610-210, Brazil;
| | - Samuel Tehuacanero-Cuapa
- Central Microscopy Laboratory, Physics Institute—UNAM, Research Circuit s/n, University City, Coyoacán, Mexico City 04510, Mexico;
| | - Rossano Lang
- Institute of Science and Technology—ICT, Federal University of São Paulo—UNIFESP, São José dos Campos 12231-280, Brazil;
| | - Alcineia C. Oliveira
- Department of Analytical and Chemical-Physic Chemistry, Pici Campus-Block 940, Federal University of Ceará, Fortaleza 60040-531, Brazil; (J.V.C.d.C.); (G.M.)
- Correspondence: (A.C.O.); (E.R.-C.)
| | - Enrique Rodríguez-Castellón
- Department of Inorganic Chemistry, Faculty of Science, University of Málaga, 29071 Málaga, Spain;
- Correspondence: (A.C.O.); (E.R.-C.)
| | - Elena Rodríguez-Aguado
- Department of Inorganic Chemistry, Faculty of Science, University of Málaga, 29071 Málaga, Spain;
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Nandanwar SU, Rathod S, Bansal V, Bokade VV. A Review on Selective Production of Acetophenone from Oxidation of Ethylbenzene over Heterogeneous Catalysts in a Decade. Catal Letters 2021. [DOI: 10.1007/s10562-020-03474-8] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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Shi G, Feng Y, Xu S, Lu Q, Liang Y, Yuan E, Ji L. Covalent anchoring of N-hydroxyphthalimide on silica via robust imide bonds as a reusable catalyst for the selective aerobic oxidation of ethylbenzene to acetophenone. NEW J CHEM 2021. [DOI: 10.1039/d1nj01268a] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
N-Hydroxyphthalimide is anchored on commercial silica by robust imide bonds, and the synthesized N-oxyl catalysts exhibit excellent activity, selectivity and reusability for the aerobic oxidation of ethylbenzene to acetophenone.
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Affiliation(s)
- Guojun Shi
- School of Chemistry and Chemical Engineering
- Yangzhou University
- Yangzhou 225002
- People's Republic of China
| | - Ya Feng
- School of Chemistry and Chemical Engineering
- Yangzhou University
- Yangzhou 225002
- People's Republic of China
| | - Sihao Xu
- School of Chemistry and Chemical Engineering
- Yangzhou University
- Yangzhou 225002
- People's Republic of China
| | - Qiuting Lu
- School of Chemistry and Chemical Engineering
- Yangzhou University
- Yangzhou 225002
- People's Republic of China
| | - Yuxin Liang
- School of Chemistry and Chemical Engineering
- Yangzhou University
- Yangzhou 225002
- People's Republic of China
| | - Enxian Yuan
- School of Chemistry and Chemical Engineering
- Yangzhou University
- Yangzhou 225002
- People's Republic of China
| | - Lijun Ji
- School of Chemistry and Chemical Engineering
- Yangzhou University
- Yangzhou 225002
- People's Republic of China
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