Catalytic Oxidation of Ammonia over Cerium-Modified Copper Aluminium Zinc Mixed Oxides

Copper-containing mixed metal oxides are one of the most promising catalysts of selective catalytic oxidation of ammonia. These materials are characterized by high catalytic efficiency; however, process selectivity to dinitrogen is still an open challenge. The set of Cu-Zn-Al-O and Ce/Cu-Zn-Al-O mix...

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Autores principales:	Sylwia Górecka, Kateřina Pacultová, Dagmar Fridrichová, Kamil Górecki, Tereza Bílková, Radim Žebrák, Lucie Obalová
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	ammonia oxidation mixed metal oxides zinc copper copper-cerium catalysts Cu-Zn Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
Acceso en línea:	https://doaj.org/article/2d66ce2007e74c549738bbb0cd7edd4d
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spelling	oai:doaj.org-article:2d66ce2007e74c549738bbb0cd7edd4d2021-11-11T18:08:42ZCatalytic Oxidation of Ammonia over Cerium-Modified Copper Aluminium Zinc Mixed Oxides10.3390/ma142165811996-1944https://doaj.org/article/2d66ce2007e74c549738bbb0cd7edd4d2021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1944/14/21/6581https://doaj.org/toc/1996-1944Copper-containing mixed metal oxides are one of the most promising catalysts of selective catalytic oxidation of ammonia. These materials are characterized by high catalytic efficiency; however, process selectivity to dinitrogen is still an open challenge. The set of Cu-Zn-Al-O and Ce/Cu-Zn-Al-O mixed metal oxides were tested as catalysts of selective catalytic oxidation of ammonia. At the low-temperature range, from 250 °C up to 350 °C, materials show high catalytic activity and relatively high selectivity to dinitrogen. Samples with the highest Cu loading 12 and 15 mol.% of total cation content were found to be the most active materials. Additional sample modification by wet impregnation of cerium (8 wt.%) improves catalytic efficiency, especially N<sub>2</sub> selectivity. The comparison of catalytic tests with results of physicochemical characterization allows connecting the catalysts efficiency with the form and distribution of CuO on the samples’ surface. The bulk-like well-developed phases were associated with sample activity, while the dispersed CuO phases with dinitrogen selectivity. Material characterization included phase composition analysis (X-ray powder diffraction, UV-Vis diffuse reflectance spectroscopy), determination of textural properties (low-temperature N<sub>2</sub> sorption, scanning electron microscopy) and sample reducibility analysis (H<sub>2</sub> temperature-programmed reduction).Sylwia GóreckaKateřina PacultováDagmar FridrichováKamil GóreckiTereza BílkováRadim ŽebrákLucie ObalováMDPI AGarticleammonia oxidationmixed metal oxideszinccoppercopper-cerium catalystsCu-ZnTechnologyTElectrical engineering. Electronics. Nuclear engineeringTK1-9971Engineering (General). Civil engineering (General)TA1-2040MicroscopyQH201-278.5Descriptive and experimental mechanicsQC120-168.85ENMaterials, Vol 14, Iss 6581, p 6581 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	ammonia oxidation mixed metal oxides zinc copper copper-cerium catalysts Cu-Zn Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
spellingShingle	ammonia oxidation mixed metal oxides zinc copper copper-cerium catalysts Cu-Zn Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 Sylwia Górecka Kateřina Pacultová Dagmar Fridrichová Kamil Górecki Tereza Bílková Radim Žebrák Lucie Obalová Catalytic Oxidation of Ammonia over Cerium-Modified Copper Aluminium Zinc Mixed Oxides
description	Copper-containing mixed metal oxides are one of the most promising catalysts of selective catalytic oxidation of ammonia. These materials are characterized by high catalytic efficiency; however, process selectivity to dinitrogen is still an open challenge. The set of Cu-Zn-Al-O and Ce/Cu-Zn-Al-O mixed metal oxides were tested as catalysts of selective catalytic oxidation of ammonia. At the low-temperature range, from 250 °C up to 350 °C, materials show high catalytic activity and relatively high selectivity to dinitrogen. Samples with the highest Cu loading 12 and 15 mol.% of total cation content were found to be the most active materials. Additional sample modification by wet impregnation of cerium (8 wt.%) improves catalytic efficiency, especially N<sub>2</sub> selectivity. The comparison of catalytic tests with results of physicochemical characterization allows connecting the catalysts efficiency with the form and distribution of CuO on the samples’ surface. The bulk-like well-developed phases were associated with sample activity, while the dispersed CuO phases with dinitrogen selectivity. Material characterization included phase composition analysis (X-ray powder diffraction, UV-Vis diffuse reflectance spectroscopy), determination of textural properties (low-temperature N<sub>2</sub> sorption, scanning electron microscopy) and sample reducibility analysis (H<sub>2</sub> temperature-programmed reduction).
format	article
author	Sylwia Górecka Kateřina Pacultová Dagmar Fridrichová Kamil Górecki Tereza Bílková Radim Žebrák Lucie Obalová
author_facet	Sylwia Górecka Kateřina Pacultová Dagmar Fridrichová Kamil Górecki Tereza Bílková Radim Žebrák Lucie Obalová
author_sort	Sylwia Górecka
title	Catalytic Oxidation of Ammonia over Cerium-Modified Copper Aluminium Zinc Mixed Oxides
title_short	Catalytic Oxidation of Ammonia over Cerium-Modified Copper Aluminium Zinc Mixed Oxides
title_full	Catalytic Oxidation of Ammonia over Cerium-Modified Copper Aluminium Zinc Mixed Oxides
title_fullStr	Catalytic Oxidation of Ammonia over Cerium-Modified Copper Aluminium Zinc Mixed Oxides
title_full_unstemmed	Catalytic Oxidation of Ammonia over Cerium-Modified Copper Aluminium Zinc Mixed Oxides
title_sort	catalytic oxidation of ammonia over cerium-modified copper aluminium zinc mixed oxides
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/2d66ce2007e74c549738bbb0cd7edd4d
work_keys_str_mv	AT sylwiagorecka catalyticoxidationofammoniaoverceriummodifiedcopperaluminiumzincmixedoxides AT katerinapacultova catalyticoxidationofammoniaoverceriummodifiedcopperaluminiumzincmixedoxides AT dagmarfridrichova catalyticoxidationofammoniaoverceriummodifiedcopperaluminiumzincmixedoxides AT kamilgorecki catalyticoxidationofammoniaoverceriummodifiedcopperaluminiumzincmixedoxides AT terezabilkova catalyticoxidationofammoniaoverceriummodifiedcopperaluminiumzincmixedoxides AT radimzebrak catalyticoxidationofammoniaoverceriummodifiedcopperaluminiumzincmixedoxides AT lucieobalova catalyticoxidationofammoniaoverceriummodifiedcopperaluminiumzincmixedoxides
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Catalytic Oxidation of Ammonia over Cerium-Modified Copper Aluminium Zinc Mixed Oxides

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