Mesoporous copper-ceria-titania ternary oxides as catalysts for environmental protection: Impact of Ce/Ti ratio and preparation procedure

Tsoncheva, Tanya; Mileva, Alexandra; Issa, Gloria; Henych, Jiří; Tolasz, Jakub; Dimitrov, Momtchil; Kovacheva, Daniela; Atanasova, G.; Štengl, Václav

doi:10.1016/j.apcata.2020.117487

Cited by 8 publications

(15 citation statements)

References 52 publications

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“…Thus, the physicochemical characterization clearly indicates variations in the microstructure of the samples, depending on the modification procedure used. In line with our previous study [53], it could be attributed to different mechanisms of copper deposition on the support. Obviously, during the CH procedure, the interaction of copper ammonia precursor with the zirconia surface acidic sites provided the formation of uniform, wellcrystallized, needle-like particles, combined with transformations of t-ZrO 2 to the more stable m-ZrO 2 under ambient conditions (Table 3).…”

Section: Samplesupporting

confidence: 92%

“…Alternatively, a copper ammonia complex was prepared from Cu(NO 3 ) 2 .3H 2 O and an aqueous solution of ammonia as described in [53]. Then, the zirconia-titania solid was added and, after 30 min of stirring, was cooled in an ice bath up to 273 K. The product was diluted with water and, after filtration, washing, and drying at 383 K overnight, it was subjected to calcination at 773 K for 4 h. The materials obtained by using the thus described chemisorption-hydrolysis (CH) procedure were denoted as CuxZryTi_CH.…”

Section: Methodsmentioning

confidence: 99%

“…Obviously, during the CH procedure, the interaction of copper ammonia precursor with the zirconia surface acidic sites provided the formation of uniform, wellcrystallized, needle-like particles, combined with transformations of t-ZrO 2 to the more stable m-ZrO 2 under ambient conditions (Table 3). In contrast, following the mechanism described in [53], the WI procedure ensured limited insertion of Cu 2+ ions into the zirconia lattice. This provoked the stabilization of the t-ZrO 2 polymorph [62] and simultaneous formation of a Cu-O-Cu layer and CuO agglomerates.…”

Section: Samplementioning

confidence: 99%

“…In our previous study using a template-assisted hydrothermal procedure, successful preparation of mesoporous TiO 2 -ZrO 2 oxides in a wide range of Zr/Ti ratios was achieved [52]. The advantages of the novel "chemisorption-hydrolysis" strategy for the deposition of uniform, finely dispersed, and highly active CuO particles on mixed TiO 2 -CeO 2 supports were also reported [53]. The current study is aimed at the elucidation of the complex effect of the variation in the microstructure of the TiO 2 -ZrO 2 binary oxides with diverse Ti/Zr ratios and copper loading procedures on the state of the supported CuO species.…”

Section: Introductionmentioning

confidence: 98%

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Design Control of Copper-Doped Titania–Zirconia Catalysts for Methanol Decomposition and Total Oxidation of Ethyl Acetate

et al. 2022

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This study is focused on the design control of Cu–Zr–Ti oxide composites by the variation of the Zr/Ti ratio and the copper deposition procedure used. For the first time, these ternary composites were obtained by a combination of template-assisted hydrothermal techniques for the preparation of mesoporous ZrO2–TiO2 mixed oxides with diverse compositions, followed by the consecutive chemisorption and hydrolysis of copper ammonia complexes on them. The nitrogen physisorption, XRD, SEM, HRTEM, TPR, XPS, UV-Vis, and Raman spectroscopies were applied for the catalysts’ characterization. Methanol decomposition and the total oxidation of ethyl acetate, both of which with potential for sustainable environmental protection, were used as catalytic tests. The complex relationship between the phase composition, structure, and morphology of titania–zirconia mixed oxides and the state and catalytic behavior of the copper oxide species supported on them was investigated. In comparison with the conventional impregnation technique, the novel preparation procedure revealed the generation of more uniform and homogeneously dispersed needle-like copper oxide crystallites in the mesoporous TiO2–ZrO2 host matrix, which typically ensure improved catalytic performance. The synergistic activity between the loaded copper species and TiO2–ZrO2 support was discussed. All ternary composites exhibited superior catalytic activity in total oxidation of ethyl acetate. The specific behavior of the catalysts in methanol decomposition was related to the irreversible phase transformations by the influence of the reaction medium.

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Section: Samplesupporting

confidence: 92%

Section: Methodsmentioning

confidence: 99%

Section: Samplementioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

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Design Control of Copper-Doped Titania–Zirconia Catalysts for Methanol Decomposition and Total Oxidation of Ethyl Acetate

et al. 2022

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“…Both reactions gained a potential for sustainable environmental protection. Nowadays, ethyl acetate is known as one of the most difficultly oxidized volatile organic compounds (VOCs) 42 and methanol could be a suitable carrier for safety storage of hydrogen. 43 ■ EXPERIMENTAL SECTION Materials.…”

Section: ■ Introductionmentioning

confidence: 99%

Formation of Catalytic Active Sites in Hydrothermally Obtained Binary Ceria–Iron Oxides: Composition and Preparation Effects

Tsoncheva

Rosmini

Dimitrov

et al. 2020

ACS Appl. Mater. Interfaces

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A series of mesoporous cerium−iron binary oxides was prepared by a hydrothermal technique using CTAB as a template. The influence of the Fe/Ce ratio and the variations in the preparation techniques such as the type of solvent and the precipitation agent, the approach of the template release, and the temperature of calcination on the phase composition, textural, structural, surface, and redox properties of the obtained materials was studied in details by XRD, nitrogen physisorption, TPR, FTIR, UV−vis, XPS, Raman, and Moessbauer spectroscopies. The materials were tested as catalysts in methanol decomposition and total oxidation of ethyl acetate. It was assumed that the binary materials represented a complex mixture of differently substituted ceria-and hematite-like phases. Critical assessment of their formation on the base of a common mechanism scheme was proposed. This scheme declares the key role of the formation of shared Ce−O−Fe structures by insertion of Fe 3+ in the ceria lattice and further competitive compensation of the lattice charge balance by the existing in the system ions, which could be controlled by the Fe/Ce ratio and the hydrothermal synthesis procedure used. This mechanism provides proper understanding and regulation of the catalytic behavior of cerium−iron oxide composites in methanol decomposition with a potential for hydrogen production and total oxidation of ethyl acetate as a model of VOCs.

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Selective and green oxidation of alcohols and sulfides using mesostructured Cu_x/Ce_y mixed oxides

Abari

Malakooti

Feghhi

2023

Applied Organom Chemis

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Mesostructured mixed metal oxides are one of the best candidates for various oxidations. Here, mesostructured Cux/Cey mixed oxides with various Cu/Ce ratios were prepared using mesoporous silica as a hard template to improve their selectivity and efficiency as the oxidative catalysts. Investigation of the different ratios of Cu/Ce showed that all catalysts are significantly more active than their salts in the oxidation of alcohols and sulfides with some green oxidants. The results demonstrated that the balance of the number of active catalytic centers (concentration of Cu) and the structural characteristics (surface area and oxygen vacancy) determine the activity of the catalysts. It also seems to be a powerful interplay among copper and cerium ions that helps the reduction of both Cu (II) and Ce (IV).

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Mesoporous copper-ceria-titania ternary oxides as catalysts for environmental protection: Impact of Ce/Ti ratio and preparation procedure

Cited by 8 publications

References 52 publications

Design Control of Copper-Doped Titania–Zirconia Catalysts for Methanol Decomposition and Total Oxidation of Ethyl Acetate

Design Control of Copper-Doped Titania–Zirconia Catalysts for Methanol Decomposition and Total Oxidation of Ethyl Acetate

Formation of Catalytic Active Sites in Hydrothermally Obtained Binary Ceria–Iron Oxides: Composition and Preparation Effects

Selective and green oxidation of alcohols and sulfides using mesostructured Cu_x/Ce_y mixed oxides

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Mesoporous copper-ceria-titania ternary oxides as catalysts for environmental protection: Impact of Ce/Ti ratio and preparation procedure

Cited by 8 publications

References 52 publications

Design Control of Copper-Doped Titania–Zirconia Catalysts for Methanol Decomposition and Total Oxidation of Ethyl Acetate

Design Control of Copper-Doped Titania–Zirconia Catalysts for Methanol Decomposition and Total Oxidation of Ethyl Acetate

Formation of Catalytic Active Sites in Hydrothermally Obtained Binary Ceria–Iron Oxides: Composition and Preparation Effects

Selective and green oxidation of alcohols and sulfides using mesostructured Cux/Cey mixed oxides

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Product

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Selective and green oxidation of alcohols and sulfides using mesostructured Cu_x/Ce_y mixed oxides