Nano- and macro-structured cerium oxide – Carbon nanotubes composites for the catalytic ozonation of organic pollutants in water

Restivo, João; Orge, Carla A.; Santos, Ana Sofia Guedes Gorito dos; Soares, O.S.G.P.; Pereira, M. Fernando R.

doi:10.1016/j.cattod.2021.04.012

Cited by 12 publications

(5 citation statements)

References 57 publications

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“…When mechanically mixed with CNT (Cs–Ru/CeO 2 + CNT MM ), the Ru reduction temperature was further lowered to 140 °C. On the contrary, when Ru is supported on CNT or synthesized with Cs–Ru/CeO 2 catalyst using coprecipitation (Cs–Ru/CeO 2 -CNT Cp ) and hydrothermal (Cs–Ru/CeO 2 -CNT Hy ) methods, Ru reduction temperature increased to the range of 200–250 °C, which is consistent with previous works on Ru/CNT catalyst. , Furthermore, a second peak was observed at a temperature above 500 °C, which is attributed to the reduction of bulk lattice oxygen on the surface of cerium oxide, and the presence of CNT could further promote the reduction of ceria . The use of cerium oxide support plays a significant role in Ru reducibility due to its reversible oxidation state between Ce 3+ /Ce 4+ .…”

Section: Resultssupporting

confidence: 89%

“…33,34 Furthermore, a second peak was observed at a temperature above 500 °C, which is attributed to the reduction of bulk lattice oxygen on the surface of cerium oxide, and the presence of CNT could further promote the reduction of ceria. 35 The use of cerium oxide support plays a significant role in Ru reducibility due to its reversible oxidation state between Ce 3+ /Ce 4+ . The oxygen vacancies on the ceria surface strongly bind Ru species, forming a Ru−Ce−O bond, elucidating the low-temperature Ru reduction in comparison to CNT support.…”

Section: Catalytic Performance Comparisonmentioning

confidence: 99%

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Insight into Enhanced Microwave Heating for Ammonia Synthesis: Effects of CNT on the Cs–Ru/CeO₂ Catalyst

Araia

Wang

Jiang

et al. 2023

ACS Appl. Mater. Interfaces

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Ammonia is emerging as a potential decarbonized H 2 energy carrier when produced from renewable energy. The on-site production of liquid ammonia from stranded renewable energy can solve the current energy transportation challenges. The employment of microwave technology can produce the desired ammonia product at milder conditions with the supply of intermittent renewable energy sources. Our previous studies have indicated that the Cs−Ru/CeO 2 catalyst is a promising catalyst for microwave-driven ammonia synthesis. In this study, the Cs−Ru/CeO 2 catalyst mechanically mixed with carbon nanotubes (CNT) and chemically synthesized using coprecipitation and a hydrothermal method is investigated systematically at low temperatures and atmospheric pressure for microwave-assisted ammonia synthesis. Additionally, the combination of two Ru-based catalysts (Cs−Ru/CeO 2 and Cs−Ru/CNT) is studied as well. Mechanical mixing of Cs−Ru/CeO 2 with CNT exhibited superior activity as compared to the chemically synthesized Cs−Ru/CeO 2 -CNT catalyst. Besides the enhancement in dielectric property, the probable synergistic effect leads to increased interfacial polarization at the interface of the mechanically mixed catalyst, improving the overall heating and ammonia production rate. Moreover, the combined Ru-based catalyst also exhibited higher activity as compared to their individual activity toward ammonia synthesis. Numerous characterization techniques were performed, including thermal imaging camera and dielectric measurements, to better understand microwave interaction with the composite catalysts.

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Section: Resultssupporting

confidence: 89%

Section: Catalytic Performance Comparisonmentioning

confidence: 99%

Insight into Enhanced Microwave Heating for Ammonia Synthesis: Effects of CNT on the Cs–Ru/CeO₂ Catalyst

Araia

Wang

Jiang

et al. 2023

ACS Appl. Mater. Interfaces

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“…In wet ball mills, a surface-active media is introduced to inhibit the formation of aggregates while dry mills are free of solvents and the attrition of particles occurs through powder-to-powder friction. Dry balling is the usual method adopted for the synthesis of carbon nanotube-based composites to control the length of the tube, for stable coatings with strong interface interactions [31][32][33]. From the earlier investigations, it is evident that wet milling is the effective method for the homogeneous dispersion of ceramic particles [34].…”

Section: Based On Wettabilitymentioning

confidence: 99%

Recent Developments on the Synthesis of Nanocomposite Materials via Ball Milling Approach for Energy Storage Applications

Joy

Krishnamoorthy²,

Tanna

et al. 2022

Applied Sciences

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This review is focused on the topical developments in the synthesis of nanocomposites using the simplest top-down approach, mechanochemical milling, and the related aspects of the interfacial interactions. Milling constraints include time duration of milling, ball size, the ball-to-sample content proportion, rotation speed, and energy that took part in a vital part of the structure–property relationships and composite interactions. Milled nanocomposites are being used in different structural applications for their higher performance rate and throughput. The synthesis of different nanocomposites and the effect of various parameters on the mill-ability of nanocomposites are discussed. Moreover, some of the major advancements in the energy sector are discussed in the latter part of the review.

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“…to improve their handleability, to allow easy recovery, and/ or to be implemented in flow mode processes. [25][26][27][28][29][30][31] This is often overlooked in academic research, considering it as a matter of practical interest. However, shaping the catalyst significantly alters its application potential.…”

Section: Introductionmentioning

confidence: 99%

“…Nanoscale catalysts indeed have to be turned into macroscopic bodies (pellets, monoliths, extrudates, membranes, etc.) to improve their handleability, to allow easy recovery, and/or to be implemented in flow mode processes [25–31] . This is often overlooked in academic research, considering it as a matter of practical interest.…”

Section: Introductionmentioning

confidence: 99%

Fibrous Material Structure Developments for Sustainable Heterogeneous Catalysis – An Overview

Loccufier,

Debecker,

D'hooge

et al. 2024

ChemCatChem

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The continuous development of advanced catalysts to increase process yield and selectivity is crucial. A high specific surface area and a good active phase dispersion are generally essential to create catalytic materials with a large number of active sites. Notably, materials with a fibrous morphology are appealing because of their large surface‐to‐volume ratio and flexibility. This contribution highlights the morphology of different types of fibrous structures currently under investigation, all the way from the nanoscale to the macroscale and back, where the distinction lies in the length and diameter of the fibers, as well as in the connection between the structures. Fibers with at least one nanoscale characteristic result in higher yield compared to macroscopic structures, but can display practical usability issues. Therefore, microfiber and fabric catalysts are more industrially relevant today. By combining different morphologies, the best of both nanomaterials and macroscopic integer materials can be combined into advanced catalytic materials. This overview showcases the large potential of these materials but makes clear that further research is needed to keep expanding the use and effectiveness of fibrous structures in catalysis.

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Nano- and macro-structured cerium oxide – Carbon nanotubes composites for the catalytic ozonation of organic pollutants in water

Cited by 12 publications

References 57 publications

Insight into Enhanced Microwave Heating for Ammonia Synthesis: Effects of CNT on the Cs–Ru/CeO₂ Catalyst

Insight into Enhanced Microwave Heating for Ammonia Synthesis: Effects of CNT on the Cs–Ru/CeO₂ Catalyst

Recent Developments on the Synthesis of Nanocomposite Materials via Ball Milling Approach for Energy Storage Applications

Fibrous Material Structure Developments for Sustainable Heterogeneous Catalysis – An Overview

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Nano- and macro-structured cerium oxide – Carbon nanotubes composites for the catalytic ozonation of organic pollutants in water

Cited by 12 publications

References 57 publications

Insight into Enhanced Microwave Heating for Ammonia Synthesis: Effects of CNT on the Cs–Ru/CeO2 Catalyst

Insight into Enhanced Microwave Heating for Ammonia Synthesis: Effects of CNT on the Cs–Ru/CeO2 Catalyst

Recent Developments on the Synthesis of Nanocomposite Materials via Ball Milling Approach for Energy Storage Applications

Fibrous Material Structure Developments for Sustainable Heterogeneous Catalysis – An Overview

Contact Info

Product

Resources

About

Insight into Enhanced Microwave Heating for Ammonia Synthesis: Effects of CNT on the Cs–Ru/CeO₂ Catalyst

Insight into Enhanced Microwave Heating for Ammonia Synthesis: Effects of CNT on the Cs–Ru/CeO₂ Catalyst