Zeolite Y modified with palladium as effective catalyst for selective catalytic oxidation of ammonia to nitrogen

Jabłońska, Magdalena; Król, A.; Kukulska–Zając, Ewa; Tarach, Karolina A.; Chmielarz, Lucjan; Góra‐Marek, Kinga

doi:10.1016/j.jcat.2014.04.022

Cited by 95 publications

(68 citation statements)

References 50 publications

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“…Table 4 were found topossess high catalytic activity in NH 3 -SCO process. High N 2 selectivity, especially in the high temperature range, could be considered in the term of protection of NH 4 + ions against oxidation and therefore their availability for reduction of NOx (NH 3 -SCR) [33].Additionally, in contrast to nonporous materials [34], higher selectivity to N 2 has been reported for mesoporous materials with higher specific surface area providing larger number of acid sites accessible for reactants. The fabricated mesopores system facilitated the transport of the reactant molecules thus enhanced ammonia chemisorption and further transformation.…”

Section: Quantification Of Acid Sites With Ammoniamentioning

confidence: 99%

IR studies of Fe modified ZSM-5 zeolites of diverse mesopore topologies in the terms of their catalytic performance in NH3-SCR and NH3-SCO processes

Góra‐Marek

Brylewska

Tarach

et al. 2015

Applied Catalysis B: Environmental

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102

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Section: Quantification Of Acid Sites With Ammoniamentioning

confidence: 99%

IR studies of Fe modified ZSM-5 zeolites of diverse mesopore topologies in the terms of their catalytic performance in NH3-SCR and NH3-SCO processes

Góra‐Marek

Brylewska

Tarach

et al. 2015

Applied Catalysis B: Environmental

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102

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“…1540 cm −1 ). Other broad bands at 1280 and 1338 cm −1 are tentatively assigned to either surface nitrate species or to chemisorbed NO 2 . However, their relative intensity is much lower, than in case of pure SnO 2 .…”

Section: Resultsmentioning

confidence: 88%

Enhancement of Lewis Acidity of Cr‐Doped Nanocrystalline SnO₂: Effect on Surface NH₃ Oxidation and Sensory Detection Pattern

et al. 2019

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Understanding ammonia oxidation over metal oxide surfaces is crucial for improving its detection with resistive type gas sensors. Formation of NOx during this process makes sensor response and calibration unstable. Cr‐doping of nanocrystalline metal oxides has been reported to suppress NO2 sensitivity and improve response towards NH3, however the exact mechanism of such chromium action remained unknown. Herein, by using EPR spectroscopy we demonstrate formation of Cr(VI) lattice defects on the surface of nanocrystalline Cr‐doped SnO2. Enhancement of Cr‐doped SnO2 surface acidity and ammonia adsorption as a result has been revealed by using in situ IR spectroscopy. Moreover, a decrease in concentration of free electrons in the conduction band has been shown as a result of substitutional Cr(III) defects formation. Weaker NOx chemisorption during ammonia oxidation over SnO2 surface after Cr doping has been found with the use of mass‐spectrometry assisted NH3 thermo‐programmed desorption. The given example of surface acidity adjustment and electronic configuration by means of doping may find use in the design of new gas‐sensing metal oxide materials.

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“…Indeed, the v (OH) intensity of the strong acid sites of H‐Y‐40 and Pd/H‐Y‐40 are very similar with or without CO (Figure S15). For both bifunctional catalysts, the observed increase in the amount of desorbed NH 3 at low temperature can be attributed to various amounts of Lewis acidic Pd centers …”

Section: Resultsmentioning

confidence: 94%

Selectivity Control in the Tandem Aromatization of Bio‐Based Furanics Catalyzed by Solid Acids and Palladium

et al. 2016

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Bio‐based furanics can be aromatized efficiently by sequential Diels–Alder (DA) addition and hydrogenation steps followed by tandem catalytic aromatization. With a combination of zeolite H‐Y and Pd/C, the hydrogenated DA adduct of 2‐methylfuran and maleic anhydride can thus be aromatized in the liquid phase and, to a certain extent, decarboxylated to give high yields of the aromatic products 3‐methylphthalic anhydride and o‐ and m‐toluic acid. Here, it is shown that a variation in the acidity and textural properties of the solid acid as well as bifunctionality offers a handle on selectivity toward aromatic products. The zeolite component was found to dominate selectivity. Indeed, a linear correlation is found between 3‐methylphthalic anhydride yield and the product of (strong acid/total acidity) and mesopore volume of H‐Y, highlighting the need for balanced catalyst acidity and porosity. The efficient coupling of the dehydration and dehydrogenation steps by varying the zeolite‐to‐Pd/C ratio allowed the competitive decarboxylation reaction to be effectively suppressed, which led to an improved 3‐methylphthalic anhydride/total aromatics selectivity ratio of 80 % (89 % total aromatics yield). The incorporation of Pd nanoparticles in close proximity to the acid sites in bifunctional Pd/H‐Y catalysts also afforded a flexible means to control aromatic products selectivity, as further demonstrated in the aromatization of hydrogenated DA adducts from other diene/dienophile combinations.

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Zeolite Y modified with palladium as effective catalyst for selective catalytic oxidation of ammonia to nitrogen

Cited by 95 publications

References 50 publications

IR studies of Fe modified ZSM-5 zeolites of diverse mesopore topologies in the terms of their catalytic performance in NH3-SCR and NH3-SCO processes

IR studies of Fe modified ZSM-5 zeolites of diverse mesopore topologies in the terms of their catalytic performance in NH3-SCR and NH3-SCO processes

Enhancement of Lewis Acidity of Cr‐Doped Nanocrystalline SnO₂: Effect on Surface NH₃ Oxidation and Sensory Detection Pattern

Selectivity Control in the Tandem Aromatization of Bio‐Based Furanics Catalyzed by Solid Acids and Palladium

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Zeolite Y modified with palladium as effective catalyst for selective catalytic oxidation of ammonia to nitrogen

Cited by 95 publications

References 50 publications

IR studies of Fe modified ZSM-5 zeolites of diverse mesopore topologies in the terms of their catalytic performance in NH3-SCR and NH3-SCO processes

IR studies of Fe modified ZSM-5 zeolites of diverse mesopore topologies in the terms of their catalytic performance in NH3-SCR and NH3-SCO processes

Enhancement of Lewis Acidity of Cr‐Doped Nanocrystalline SnO2: Effect on Surface NH3 Oxidation and Sensory Detection Pattern

Selectivity Control in the Tandem Aromatization of Bio‐Based Furanics Catalyzed by Solid Acids and Palladium

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Enhancement of Lewis Acidity of Cr‐Doped Nanocrystalline SnO₂: Effect on Surface NH₃ Oxidation and Sensory Detection Pattern