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Jabłońska M. Progress on Noble Metal-Based Catalysts Dedicated to the Selective Catalytic Ammonia Oxidation into Nitrogen and Water Vapor (NH 3-SCO). Molecules 2021; 26:6461. [PMID: 34770870 PMCID: PMC8587564 DOI: 10.3390/molecules26216461] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2021] [Revised: 10/19/2021] [Accepted: 10/25/2021] [Indexed: 11/17/2022] Open
Abstract
A recent development for selective ammonia oxidation into nitrogen and water vapor (NH3-SCO) over noble metal-based catalysts is covered in the mini-review. As ammonia (NH3) can harm human health and the environment, it led to stringent regulations by environmental agencies around the world. With the enforcement of the Euro VI emission standards, in which a limitation for NH3 emissions is proposed, NH3 emissions are becoming more and more of a concern. Noble metal-based catalysts (i.e., in the metallic form, noble metals supported on metal oxides or ion-exchanged zeolites, etc.) were rapidly found to possess high catalytic activity for NH3 oxidation at low temperatures. Thus, a comprehensive discussion of property-activity correlations of the noble-based catalysts, including Pt-, Pd-, Ag- and Au-, Ru-based catalysts is given. Furthermore, due to the relatively narrow operating temperature window of full NH3 conversion, high selectivity to N2O and NOx as well as high costs of noble metal-based catalysts, recent developments are aimed at combining the advantages of noble metals and transition metals. Thus, also a brief overview is provided about the design of the bifunctional catalysts (i.e., as dual-layer catalysts, mixed form (mechanical mixture), hybrid catalysts having dual-layer and mixed catalysts, core-shell structure, etc.). Finally, the general conclusions together with a discussion of promising research directions are provided.
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Affiliation(s)
- Magdalena Jabłońska
- Institute of Chemical Technology, Universität Leipzig, Linnéstr. 3, 04103 Leipzig, Germany
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Pakrieva E, Kolobova E, Kotolevich Y, Pascual L, Carabineiro SAC, Kharlanov AN, Pichugina D, Nikitina N, German D, Zepeda Partida TA, Tiznado Vazquez HJ, Farías MH, Bogdanchikova N, Cortés Corberán V, Pestryakov A. Effect of Gold Electronic State on the Catalytic Performance of Nano Gold Catalysts in n-Octanol Oxidation. NANOMATERIALS 2020; 10:nano10050880. [PMID: 32370180 PMCID: PMC7279484 DOI: 10.3390/nano10050880] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Revised: 04/24/2020] [Accepted: 04/29/2020] [Indexed: 11/20/2022]
Abstract
This study aims to identify the role of the various electronic states of gold in the catalytic behavior of Au/MxOy/TiO2 (where MxOy are Fe2O3 or MgO) for the liquid phase oxidation of n-octanol, under mild conditions. For this purpose, Au/MxOy/TiO2 catalysts were prepared by deposition-precipitation with urea, varying the gold content (0.5 or 4 wt.%) and pretreatment conditions (H2 or O2), and characterized by low temperature nitrogen adsorption-desorption, X-ray powder diffraction (XRD), energy dispersive spectroscopy (EDX), scanning transmission electron microscopy-high angle annular dark field (STEM HAADF), diffuse reflectance Fourier transform infrared (DRIFT) spectroscopy of CO adsorption, temperature-programmable desorption (TPD) of ammonia and carbon dioxide, and X-ray photoelectron spectroscopy (XPS). Three states of gold were identified on the surface of the catalysts, Au0, Au1+ and Au3+, and their ratio determined the catalysts performance. Based on a comparison of catalytic and spectroscopic results, it may be concluded that Au+ was the active site state, while Au0 had negative effect, due to a partial blocking of Au0 by solvent. Au3+ also inhibited the oxidation process, due to the strong adsorption of the solvent and/or water formed during the reaction. Density functional theory (DFT) simulations confirmed these suggestions. The dependence of selectivity on the ratio of Brønsted acid centers to Brønsted basic centers was revealed.
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Affiliation(s)
- Ekaterina Pakrieva
- Research School of Chemistry & Applied Biomedical Sciences, National Research Tomsk Polytechnic University, Lenin Av. 30, 634050 Tomsk, Russia; (E.K.); (D.G.)
- Instituto de Catálisis y Petroleoquímica, Consejo Superior de InvestigacionesCientíficas, Marie Curie 2, 28049 Madrid, Spain; (L.P.); (V.C.C.)
- Correspondence: (E.P.); (A.P.)
| | - Ekaterina Kolobova
- Research School of Chemistry & Applied Biomedical Sciences, National Research Tomsk Polytechnic University, Lenin Av. 30, 634050 Tomsk, Russia; (E.K.); (D.G.)
| | - Yulia Kotolevich
- Centro de Nanociencias y Nanotecnología, Universidad Nacional Autónoma de México, P.O. Box 14, Ensenada 22800, Mexico; (Y.K.); (T.A.Z.P.); (H.J.T.V.); (M.H.F.); (N.B.)
| | - Laura Pascual
- Instituto de Catálisis y Petroleoquímica, Consejo Superior de InvestigacionesCientíficas, Marie Curie 2, 28049 Madrid, Spain; (L.P.); (V.C.C.)
| | - Sónia A. C. Carabineiro
- LAQV-REQUIMTE, Department of Chemistry, NOVA School of Science and Technology, Universidade, NOVA de Lisboa, 2829-516 Caparica, Portugal;
| | - Andrey N. Kharlanov
- Department of Chemistry, Lomonosov Moscow State University, 1-3 Leninskiye Gory, GSP-1, 119991 Moscow, Russia; (A.N.K.); (D.P.); (N.N.)
| | - Daria Pichugina
- Department of Chemistry, Lomonosov Moscow State University, 1-3 Leninskiye Gory, GSP-1, 119991 Moscow, Russia; (A.N.K.); (D.P.); (N.N.)
| | - Nadezhda Nikitina
- Department of Chemistry, Lomonosov Moscow State University, 1-3 Leninskiye Gory, GSP-1, 119991 Moscow, Russia; (A.N.K.); (D.P.); (N.N.)
| | - Dmitrii German
- Research School of Chemistry & Applied Biomedical Sciences, National Research Tomsk Polytechnic University, Lenin Av. 30, 634050 Tomsk, Russia; (E.K.); (D.G.)
| | - Trino A. Zepeda Partida
- Centro de Nanociencias y Nanotecnología, Universidad Nacional Autónoma de México, P.O. Box 14, Ensenada 22800, Mexico; (Y.K.); (T.A.Z.P.); (H.J.T.V.); (M.H.F.); (N.B.)
| | - Hugo J. Tiznado Vazquez
- Centro de Nanociencias y Nanotecnología, Universidad Nacional Autónoma de México, P.O. Box 14, Ensenada 22800, Mexico; (Y.K.); (T.A.Z.P.); (H.J.T.V.); (M.H.F.); (N.B.)
| | - Mario H. Farías
- Centro de Nanociencias y Nanotecnología, Universidad Nacional Autónoma de México, P.O. Box 14, Ensenada 22800, Mexico; (Y.K.); (T.A.Z.P.); (H.J.T.V.); (M.H.F.); (N.B.)
| | - Nina Bogdanchikova
- Centro de Nanociencias y Nanotecnología, Universidad Nacional Autónoma de México, P.O. Box 14, Ensenada 22800, Mexico; (Y.K.); (T.A.Z.P.); (H.J.T.V.); (M.H.F.); (N.B.)
| | - Vicente Cortés Corberán
- Instituto de Catálisis y Petroleoquímica, Consejo Superior de InvestigacionesCientíficas, Marie Curie 2, 28049 Madrid, Spain; (L.P.); (V.C.C.)
| | - Alexey Pestryakov
- Research School of Chemistry & Applied Biomedical Sciences, National Research Tomsk Polytechnic University, Lenin Av. 30, 634050 Tomsk, Russia; (E.K.); (D.G.)
- Correspondence: (E.P.); (A.P.)
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