Potassium Titanate Nanobelts: A Unique Support for Au and AuRh Nanoparticles in the Catalytic Reduction of NO with CO

Wang, Xianwei; Maeda, Nobutaka; Meier, Daniel M.; Baiker, Alfons

doi:10.1002/cctc.202001401

Cited by 10 publications

(5 citation statements)

References 65 publications

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“…K has a promotion effect on the carrier. The modification of K to TiO 2 with loading Au have been found forming K 2 Ti 8 O 17 , which promotes the formation of isocyanide (-NCO) [98]. -NCO is an important reaction intermediate, which is considered to be a key to the high activity and selectivity of NO-CO reaction [99].…”

Section: Promotion Effects Of K On Reaction Process and Catalyst Propertiesmentioning

confidence: 99%

Application Prospect of K Used for Catalytic Removal of NOx, COx, and VOCs from Industrial Flue Gas: A Review

Shi

et al. 2021

Catalysts

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NOx, COx, and volatile organic compounds (VOCs) widely exist in motor vehicle exhaust, coke oven flue gas, sintering flue gas, and pelletizing flue gas. Potassium species have an excellent promotion effect on various catalytic reactions for the treatment of these pollutants. This work reviews the promotion effects of potassium species on the reaction processes, including adsorption, desorption, the pathway and selectivity of reaction, recovery of active center, and effects on the properties of catalysts, including basicity, electron donor characteristics, redox property, active center, stability, and strong metal-to support interaction. The suggestions about how to improve the promotion effects of potassium species in various catalytic reactions are put forward, which involve controlling carriers, content, preparation methods and reaction conditions. The promotion effects of different alkali metals are also compared. The article number about commonly used active metals and promotion ways are also analyzed by bibliometric on NOx, COx, and VOCs. The promotion mechanism of potassium species on various reactions is similar; therefore, the application prospect of potassium species for the coupling control of multi-pollutants in industrial flue gas at low-temperature is described.

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Section: Promotion Effects Of K On Reaction Process and Catalyst Propertiesmentioning

confidence: 99%

Application Prospect of K Used for Catalytic Removal of NOx, COx, and VOCs from Industrial Flue Gas: A Review

Shi

et al. 2021

Catalysts

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“…Noble-metal-based catalysts exhibit significant performance advantages under O 2 -containing conditions, especially Ir-based catalysts. Ir 0 nanoparticles are considered as the active sites because they can simultaneously adsorb NO and CO, promoting the dissociation of NO. − However, the Ir 0 site also exhibits strong adsorption of O 2 , which may lead to a decrease in catalytic activity of the catalyst under O 2 competitive adsorption. Considering that Ir δ+ and Ir 0 usually coexist, there may be Ir sites in different states in the catalysts that are also responsible for the significant performance advantages in the presence of O 2 .…”

Section: Introductionmentioning

confidence: 99%

Unraveling the Synergistic Mechanism of Ir Species with Various Electron Densities over an Ir/ZSM-5 Catalyst Enables High-Efficiency NO Reduction by CO

Liu,

Wang,

et al. 2024

Environ. Sci. Technol.

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Selective catalytic reduction using CO as a reducing agent (CO-SCR) has exhibited its application potential in coal-fired, steel, and other industrial sectors. In comparison to NH 3 -SCR, CO-SCR can achieve synergistic control of CO and NO pollutants, making it a powerful denitrification technology that treats waste with waste. Unfortunately, the competitive adsorption of O 2 and NO on CO-SCR catalysts inhibits efficient conversion of NO x under O 2 -containing conditions. In this work, we obtained two Ir sites with different electron densities, Ir 1 single atoms in the oxidized Ir δ+ state and Ir 0 nanoparticles in the metallic state, by controlled pretreatment of the Ir/ZSM-5 catalyst with H 2 at 200 °C. The coexistence of Ir 1 single atoms and Ir 0 nanoparticles on ZSM-5 creates a synergistic effect, which facilitates the reduction of NO through CO in the presence of O 2 , following the Langmuir−Hinshelwood mechanism. The ONNO dimer is formed on the Ir 1 single atom sites and then spills over to the neighboring Ir 0 nanoparticles for subsequent reduction to N 2 by CO. Specifically, this tandem reaction enables 83% NO conversion and 100% CO conversion on an Ir-based catalyst at 250 °C under 3% O 2 .

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“…However, at the nanoscale Au and Rh form hybrid structures which were proved to be very effective in catalysing light-induced reactions such as hydrogen generation from water, [16] oxygen evolution, [17] H 2 O 2 synthesis [18] and NO reduction in presence of carbon monoxide. [19,20] AuRh nanoalloys also show superb catalytic activity towards carbonbased compounds, as in the case of tetralin hydroconversion with H 2 S, [21] alkenes reduction with gaseous hydrogen [22] and CO oxidation. [23] Finally, it was recently shown that such systems have strong bactericide action towards drug-resistant bacteria.…”

Section: Introductionmentioning

confidence: 99%

Exploring AuRh Nanoalloys: A Computational Perspective on the Formation and Physical Properties

et al. 2022

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We studied the formation of AuRh nanoalloys (between 20–150 atoms) in the gas phase by means of Molecular Dynamics (MD) calculations, exploring three possible formation processes: one‐by‐one growth, coalescence, and nanodroplets annealing. As a general trend, we recover a predominance of Rh@Au core‐shell ordering over other chemical configurations. We identify new structural motifs with enhanced thermal stabilities. The physical features of those selected systems were studied at the Density Functional Theory (DFT) level, revealing profound correlations between the nanoalloys morphology and properties. Surprisingly, the arrangement of the inner Rh core seems to play a dominant role on nanoclusters’ physical features like the HOMO‐LUMO gap and magnetic moment. Strong charge separations are recovered within the nanoalloys suggesting the existence of charge‐transfer transitions.

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Potassium Titanate Nanobelts: A Unique Support for Au and AuRh Nanoparticles in the Catalytic Reduction of NO with CO

Cited by 10 publications

References 65 publications

Application Prospect of K Used for Catalytic Removal of NOx, COx, and VOCs from Industrial Flue Gas: A Review

Application Prospect of K Used for Catalytic Removal of NOx, COx, and VOCs from Industrial Flue Gas: A Review

Unraveling the Synergistic Mechanism of Ir Species with Various Electron Densities over an Ir/ZSM-5 Catalyst Enables High-Efficiency NO Reduction by CO

Exploring AuRh Nanoalloys: A Computational Perspective on the Formation and Physical Properties

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