2-Chlorophenol degradation by catalytic wet air oxidation using copper supported on TiO2-CeO2-ZrO2

García-Hernández, Luis Enrique; Frías-Márquez, D.M.; Pacheco-Sosa, J. Gpe; Cervantes‐Uribe, Adrián; Arévalo‐Pérez, Juan Carlos; Pérez-Vidal, Hermicenda; Silahua-Pavón, Adib Abiu; Lunagómez-Rocha, Ma. Antonia; Torres‐Torres, Gilberto

doi:10.2166/wst.2019.330

Cited by 9 publications

(6 citation statements)

References 25 publications

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“…They are acid sites called Lewis sites where a nucleophilic substrate can be deposited [ 72 ]. Previous works have proved that the number of acid sites promotes efficient catalytic properties (e.g., in catalytic wet air oxidation of ROCs [ 37 , 54 , 73 , 74 , 75 , 76 ] and production of biofuels [ 77 , 78 , 79 ]).…”

Section: Resultsmentioning

confidence: 99%

“…However, partial oxidation commonly occurs, and this causes the simultaneous presence of intermediates and CO 2 in the reaction mixture. Nevertheless, the increase in TOC removal means that the organic refractory molecule will be more oxidized to CO 2 [ 74 , 75 , 76 ].…”

Section: Resultsmentioning

confidence: 99%

“…The conversion of glucose to produce 5-hydroxymethylfurfural (HMF) using TiO 2 –ZrO 2 binary oxides and Al 2 O 3 -TiO 2 -W has been researched. The number of acid sites plays an important role in achieving the highest 5-HMF yield [ 76 , 77 , 78 , 79 ].…”

Section: Resultsmentioning

confidence: 99%

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Chemical and Structural Changes by Gold Addition Using Recharge Method in NiW/Al2O3-CeO2-TiO2 Nanomaterials

et al. 2021

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NiWAu trimetallic nanoparticles (NPs) on the surface of support Al2O3-CeO2-TiO2 were synthesized by a three-step synthetic method in which Au NPs were incorporated into presynthesized NiW/Al2O3-CeO2-TiO2. The recharge method, also known as the redox method, was used to add 2.5 wt% gold. The Al2O3-CeO2-TiO2 support was made by a sol–gel method with two different compositions, and then two metals were simultaneously loaded (5 wt% nickel and 2.5 wt% tungsten) by two different methods, incipient wet impregnation and ultrasound impregnation method. In this paper, we study the effect of Au addition using the recharge method on NiW nanomaterials supported on mixed oxides on the physicochemical properties of synthesized nanomaterials. The prepared nanomaterials were characterized by scanning electron microscopy, BET specific surface area, X-ray diffraction, diffuse reflectance spectroscopy in the UV–visible range and temperature-programmed desorption of hydrogen. The experimental results showed that after loading of gold, the dispersion was higher (46% and 50%) with the trimetallic nanomaterials synthesized by incipient wet impregnation plus recharge method than with impregnation plus ultrasound recharge method, indicating a greater number of active trimetallic (NiWAu) sites in these materials. Small-sized Au from NiWAu/ACTU1 trimetallic nanostructures was enlarged for NiWAu/ACT1. The strong metal NPs–support interaction shown for the formation of NiAl2O4, Ni-W-O and Ni-Au-O species simultaneously present in the surface of trimetallic nanomaterial probably plays an important role in the degree of dispersion of the gold active phase.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Chemical and Structural Changes by Gold Addition Using Recharge Method in NiW/Al2O3-CeO2-TiO2 Nanomaterials

et al. 2021

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“…Ce and CN show an absorbance edge at 428 and 460 nm, respectively [74,75]. The Ce sample presented two absorbances at wavenumbers of ≈ 290 and 260 nm, corresponding to the absorption of Ce 4+ and Ce 3+ oxidation states [76]. The CN sample presented an intense absorbance at 400 nm, about the degree of exfoliation of carbon nitride [77].…”

Section: Diffuse Reflectance Uv-vis Spectroscopymentioning

confidence: 99%

Facile Synthesis of ZnO-CeO2 Heterojunction by Mixture Design and Its Application in Triclosan Degradation: Effect of Urea

et al. 2022

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In this study, simplex centroid mixture design was employed to determine the effect of urea on ZnO-CeO. The heterojunction materials were synthesized using a solid-state combustion method, and the physicochemical properties were evaluated using X-ray diffraction, nitrogen adsorption/desorption, and UV–Vis spectroscopy. Photocatalytic activity was determined by a triclosan degradation reaction under UV irradiation. According to the results, the crystal size of zinc oxide decreases in the presence of urea, whereas a reverse effect was observed for cerium oxide. A similar trend was observed for ternary samples, i.e., the higher the proportion of urea, the larger the crystallite cerium size. In brief, urea facilitated the co-existence of crystallites of CeO and ZnO. On the other hand, UV spectra indicate that urea shifts the absorption edge to a longer wavelength. Studies of the photocatalytic activity of TCS degradation show that the increase in the proportion of urea favorably influenced the percentage of mineralization.

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“…Ceria-based materials lay at the core of numerous current and future applications reported in the literature, ranging from technical processes (such as a water–gas shift reaction) − to the use in solid-oxide fuel cells as electrolytes or cathode materials , and as photocatalysts , and even biomedical applications where ceria is used to capture oxygen radicals. , Here, we present a supported ceria catalyst system that is a candidate to be used in catalytic reactions requiring materials with enhanced redox properties at intermediate temperatures, like CO/CO 2 methanation , or dry-reforming processes, where related materials have shown great promise.…”

Section: Introductionmentioning

confidence: 99%

Low-Temperature Growth of Reactive Pyrochlore Nanostructures on Zirconia-Supported Ceria: Implications for Improved Catalytic Behavior

Yeste

Hernández‐Garrido

Kumke

et al. 2022

ACS Appl. Nano Mater.

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The use of a catalyst support for the design of nanoscale heterogeneous catalysts based on cerium oxide offers vast possibilities for future catalyst development, particularly with regard to an increased focus on the use of renewable biogas and an emerging hydrogen economy. In this study, zirconia-supported ceria catalysts were synthesized, activated by using different thermochemical treatments, and characterized by way of temperature-programmed reduction (TPR), oxygen storage capacity, X-ray diffraction, electron microscopy, and luminescence spectroscopy using Eu3+ as a spectroscopic probe. Through reduction–oxidation pretreatment routines, reactive pyrochlore structures were created at temperatures as low as 600 °C and identified through TPR and electron microscopy experiments. A structural relationship and alignment of the crystal planes is revealed in high-resolution scanning transmission electron microscopy experiments through the digital diffraction patterns. Low-temperature pretreatment induces the formation of reactive pyrochlore domains under retention of the surface area of the catalyst system, and no further morphological changes are detected. Furthermore, the formation of pyrochlore domains achieved through severe reduction and mild reoxidation (SRMO) treatments is reversible. Over multiple alternating SRMO and severe reduction and severe reoxidation (SRSO) treatments, europium spectroscopy and TPR results indicate that pyrochlore structures are recreated over consecutive treatments, whenever the mild oxidation step at 500 °C is the last treatment (SRMO, SRMO–SRSO–SRMO, etc.).

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2-Chlorophenol degradation by catalytic wet air oxidation using copper supported on TiO2-CeO2-ZrO2

Cited by 9 publications

References 25 publications

Chemical and Structural Changes by Gold Addition Using Recharge Method in NiW/Al2O3-CeO2-TiO2 Nanomaterials

Chemical and Structural Changes by Gold Addition Using Recharge Method in NiW/Al2O3-CeO2-TiO2 Nanomaterials

Facile Synthesis of ZnO-CeO2 Heterojunction by Mixture Design and Its Application in Triclosan Degradation: Effect of Urea

Low-Temperature Growth of Reactive Pyrochlore Nanostructures on Zirconia-Supported Ceria: Implications for Improved Catalytic Behavior

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