Promotion of catalytic performance by adding W into Pt/ZrO2 catalyst for selective catalytic oxidation of ammonia

Sun, Mengmeng; Wang, Suning; Li, Yuanshan; Xu, Haidi

doi:10.1016/j.apsusc.2016.12.241

Cited by 61 publications

(28 citation statements)

References 56 publications

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“…As for Pt/CeZrO 2 , the obscure even overlapped interface between Pt species and CeO 2 particle was observed clearly, indicating that the interface oxygen species was very active. Moreover, the d-spacing of Pt species over Pt/CeZrO 2 was 0.29 nm, which proved PtO formation because of the oxygen species transfer function . Combining with CO-FTIR results, a good consistency was showed, the lattice oxygen species of CeZrO 2 could transfer to Pt species, making Pt species become oxidation states.…”

Section: Resultsmentioning

confidence: 67%

“…Furthermore, Pt(111) with 0.23 nm d -spacing was found on Pt/Al 2 O 3 . According to the references, the oxygen dissociation was the rate-determining step in the NH 3 -SCO reaction. , Moreover, the presence of Pt(111) for Pt/Al 2 O 3 could increase the dissociation probability of oxygen molecules, and more atomic oxygen could enhance the ability of dehydration of ammonia, which led to a higher NH 3 -SCO activity. ,, …”

Section: Resultsmentioning

confidence: 96%

“…The active platinum state could be one of the key factors to affect the catalytic performance . After the samples were pretreated in N 2 , the CO-FTIR result for Pt species was provided in Figure a.…”

Section: Resultsmentioning

confidence: 99%

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Different Reaction Mechanisms of Ammonia Oxidation Reaction on Pt/Al₂O₃ and Pt/CeZrO₂ with Various Pt States

Sun

Liu²,

Song

et al. 2019

ACS Appl. Mater. Interfaces

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NH3 emissions were limited strictly because of the threat for human health and sustainable development. Pt/Al2O3 and Pt/CeZrO2 were prepared by the impregnation method. Differences in surface chemical states, reduction ability, acid properties, morphological properties, reaction mechanisms, and ammonia oxidation activity were studied. It indicated that Pt species states were affected by different metal–support interactions. The homogeneously dispersed Pt species over Pt/Al2O3 exposed Pt(111) because of weak metal–support interactions; there even existed an obvious interface between Pt and Al2O3. While obscure even an overlapped interface was observed over Pt/CeZrO2, resulting in the formation of PtO because of the oxygen migration from CeZrO2 to Pt species (confirmed by CO-FTIR, the cycled H2-TPR and transmission electron microscopy results). It was noteworthy that different reaction mechanisms were induced by different states of Pt species; NH was the key intermediate species for ammonia oxidation reaction over Pt/Al2O3, but two kinds of intermediates, N2H4 and HNO, were observed for Pt/CeZrO2. It consequently resulted in the obvious distinction of the NH3-SCO catalytic performance; the light-off temperatures of NH3 over Pt/Al2O3 and Pt/CeZrO2 were 231 and 275 °C, respectively, while the maximum N2 selectivity (65%) was obtained over Pt/CeZrO2, it was obviously better than that over Pt/Al2O3.

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Section: Resultsmentioning

confidence: 67%

Section: Resultsmentioning

confidence: 96%

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Different Reaction Mechanisms of Ammonia Oxidation Reaction on Pt/Al₂O₃ and Pt/CeZrO₂ with Various Pt States

Sun

Liu²,

Song

et al. 2019

ACS Appl. Mater. Interfaces

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“…NO 2 and nitrate species are thought to be essential intermediates in the reaction [265]. However, other authors found that NO adsorption and decomposition on Pt would be the most important step of the reaction [268,269] [270]. Replacing Pt by Ru does not significantly improve the SCO reaction at lower temperatures [271], which does not allow selective conversion of ammonia formed in H 2 -SCR.…”

Section: Reduction By Hydrogen (H 2 -Scr)mentioning

confidence: 97%

“…Platinum being a poor NH3-SCR catalyst, this ammonia cannot be used for increasing the selective conversion of NO to N2. By contrast, Pt-WO3 is an excellent catalyst for selective oxidation of NH3 (SCO), but only at higher temperatures (250-300 °C) [270]. Replacing Pt by Ru does not significantly improve the SCO reaction at lower temperatures [271], which does not allow selective conversion of ammonia formed in H2-SCR.…”

Section: Reduction By Ethanol (C 2 H 5 Oh-scr)mentioning

confidence: 99%

Tungsten-Based Catalysts for Environmental Applications

2021

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This review aims to give a general overview of the recent use of tungsten-based catalysts for wide environmental applications, with first some useful background information about tungsten oxides. Tungsten oxide materials exhibit suitable behaviors for surface reactions and catalysis such as acidic properties (mainly Brønsted sites), redox and adsorption properties (due to the presence of oxygen vacancies) and a photostimulation response under visible light (2.6–2.8 eV bandgap). Depending on the operating condition of the catalytic process, each of these behaviors is tunable by controlling structure and morphology (e.g., nanoplates, nanosheets, nanorods, nanowires, nanomesh, microflowers, hollow nanospheres) and/or interactions with other compounds such as conductors (carbon), semiconductors or other oxides (e.g., TiO2) and precious metals. WOx particles can be also dispersed on high specific surface area supports. Based on these behaviors, WO3-based catalysts were developed for numerous environmental applications. This review is divided into five main parts: structure of tungsten-based catalysts, acidity of supported tungsten oxide catalysts, WO3 catalysts for DeNOx applications, total oxidation of volatile organic compounds in gas phase and gas sensors and pollutant remediation in liquid phase (photocatalysis).

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Emerging Porous Materials and Their Composites for NH₃ Gas Removal

Kang

Kim

et al. 2020

Advanced Science

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NH 3 , essential for producing artificial fertilizers and several military and commercial products, is being produced at a large scale to satisfy increasing demands. The inevitable leakage of NH 3 during its utilization, even in trace concentrations, poses significant environmental and health risks because of its highly toxic and reactive nature. Although numerous techniques have been developed for the removal of atmospheric NH 3 , conventional NH 3 abatement systems possess the disadvantages of high maintenance cost, low selectivity, and emission of secondary wastes. In this context, highly tunable porous materials such as metal-organic frameworks, covalent organic frameworks, hydrogen organic frameworks, porous organic polymers, and their composite materials have emerged as next-generation NH 3 adsorbents. Herein, recent progress in the development of porous NH 3 adsorbents is summarized; furthermore, factors affecting NH 3 capture are analyzed to provide a reasonable strategy for the design and synthesis of promising materials for NH 3 abatement.

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Promotion of catalytic performance by adding W into Pt/ZrO2 catalyst for selective catalytic oxidation of ammonia

Cited by 61 publications

References 56 publications

Different Reaction Mechanisms of Ammonia Oxidation Reaction on Pt/Al₂O₃ and Pt/CeZrO₂ with Various Pt States

Different Reaction Mechanisms of Ammonia Oxidation Reaction on Pt/Al₂O₃ and Pt/CeZrO₂ with Various Pt States

Tungsten-Based Catalysts for Environmental Applications

Emerging Porous Materials and Their Composites for NH₃ Gas Removal

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Promotion of catalytic performance by adding W into Pt/ZrO2 catalyst for selective catalytic oxidation of ammonia

Cited by 61 publications

References 56 publications

Different Reaction Mechanisms of Ammonia Oxidation Reaction on Pt/Al2O3 and Pt/CeZrO2 with Various Pt States

Different Reaction Mechanisms of Ammonia Oxidation Reaction on Pt/Al2O3 and Pt/CeZrO2 with Various Pt States

Tungsten-Based Catalysts for Environmental Applications

Emerging Porous Materials and Their Composites for NH3 Gas Removal

Contact Info

Product

Resources

About

Different Reaction Mechanisms of Ammonia Oxidation Reaction on Pt/Al₂O₃ and Pt/CeZrO₂ with Various Pt States

Different Reaction Mechanisms of Ammonia Oxidation Reaction on Pt/Al₂O₃ and Pt/CeZrO₂ with Various Pt States

Emerging Porous Materials and Their Composites for NH₃ Gas Removal