AN XPS study of the interaction of model Ba/TiO2 AND Ba/ZrO2 NSR catalysts with NO2

Smirnov, M. Yu.; Kalinkin, A. V.; Назимов, Д. А.; Bukhtiyarov, Valerii I.; Vovk, Evgeny I.; Özensoy, Emrah

doi:10.1134/s002247661404026x

Cited by 7 publications

(8 citation statements)

References 20 publications

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“…3a. As in our previous work in which BaO was deposited onto the surface of individual TiO 2 or ZrO 2 prepared by vacuum deposition [7], early in the exposure of the sample to NO 2 we observed the dominating formation of barium nitrite, which then turned into barium nitrate. The appearance of the nitrite in the absence of the nitrate was also observed in other works, and the reduction of NO 2 to in those works was explained by the simul taneously occurring oxidation of oxygen atoms of nitro gen dioxide to O 2 or BaO 2 .…”

Section: Resultssupporting

confidence: 81%

“…Barium was vacuum deposited onto the titania-zir conia support surface by evaporating a BaAl 4 alloy. As was demonstrated in our earlier work [7], barium being deposited is oxidized by residual gases, so a layer of Ba(II) compounds forms on the support surface. Nev ertheless, for removing the residual barium metal, the barium loaded samples were additionally exposed to oxygen at a pressure of 10 -6 mbar and a temperature of 500°C for 30 min.…”

Section: Synthesis Of Model Catalystssupporting

confidence: 53%

“…The spectrum shows three lines at binding energies of 399.5, 403.6, and 407.2 eV, which are due to different N containing surface compounds. The last two lines are due to surface barium nitrite and nitrate, respectively [7,12,[14][15][16][17]. The line at 399.0-399.8 eV is likely due to nitrogen contained in TiO 2 -ZrO 2 , since it is also observed for the initial oxide film after its interaction with NO 2 in the absence of a Ba containing compo nent.…”

Section: Resultsmentioning

confidence: 91%

“…Earlier, we carried out an X ray photoelectron spec troscopy (XPS) study of the interaction between NO 2 and the surface of the model NSR catalysts BaO/TiO 2 and BaO/ZrO 2 [7]. It was demonstrated that this treat ment of the catalysts leads to the consecutive formation of barium nitrite and barium nitrate on the surface and the nitrate forms more readily on BaO/ZrO 2 .…”

mentioning

confidence: 99%

“…It was demonstrated that this treat ment of the catalysts leads to the consecutive formation of barium nitrite and barium nitrate on the surface and the nitrate forms more readily on BaO/ZrO 2 . In this work, the approach suggested in that study [7] and in our other works dealing with NSR catalysts [8,9] is applied to the investigation of NO x sorption by model systems prepared on a titania-zirconia mixed support, namely, BaO/TiO 2 -ZrO 2 and Pt-BaO/TiO 2 -ZrO 2 .…”

mentioning

confidence: 99%

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Model sulfur-resistant NSR catalysts: An XPS study of the interaction of BaO/TiO2-ZrO2 and Pt-BaO/TiO2-ZrO2 with NO2

et al. 2015

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The interaction of NO 2 with BaO/TiO 2 -ZrO 2 and Pt-BaO/TiO 2 -ZrO 2 model NO x storagereduction (NSR) catalysts prepared on the surface of FeCrAl alloy substrates has been investigated by X ray photoelectron spectroscopy. The action of nitrogen dioxide on these catalysts at room temperature causes the consecutive formation of surface barium nitrite and nitrate. Supposedly, NO 2 reduction yielding barium nitrite at the early stages of the interaction is due to the oxidation of amorphous carbon impurities. The intro duction of platinum into the catalyst accelerates nitrogen dioxide sorption. On being exposed to NO 2 for a long time, platinum oxidizes to PtO 2 . This process is more pronounced in the sample containing freshly deposited platinum. Heat treatment of this sample in a vacuum, which coarsens the platinum particles, makes them more resistant to oxidation.

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Section: Resultssupporting

confidence: 81%

Section: Synthesis Of Model Catalystssupporting

confidence: 53%

Section: Resultsmentioning

confidence: 91%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

Model sulfur-resistant NSR catalysts: An XPS study of the interaction of BaO/TiO2-ZrO2 and Pt-BaO/TiO2-ZrO2 with NO2

et al. 2015

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FeCrAl as a Catalyst Support

et al. 2020

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The iron-chromium-aluminum alloy (FeCrAl) is an exceptional support for highly exothermic and endothermic reactions that operate above 700 °C in chemically aggressive environments, where low heat and mass transfer rates limit reaction yield. FeCrAl two-and three-dimensional structured networksmonoliths, foams, and fibersmaximize mass transfer rates, while their remarkable thermal conductivity minimizes hot spots and thermal gradients. Another advantage of the open FeCrAl structure is the low pressure drop due to the high void fraction and regularity of the internal path. The surface Al 2 O 3 layer, formed after an initial thermal oxidation, supports a wide range of metal and metal oxide active phases. The aluminum oxide that adheres to the metal surface protects it from corrosive atmospheres and carbon (carburization), thus allowing FeCrAl to operate at a higher temperature. The top applications are industrial burners, in which compact knitted metal fibers distribute heat over large surface areas, and automotive tail gas converters. Future applications include producing H 2 and syngas from remote natural gas in modular units. This Review summarizes the specific preparation techniques, details process operating conditions and catalyst performance of several classes of reactions, and highlights positive and challenging aspects of FeCrAl.

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Effects of phosphorus-modified biochar as a soil amendment on the growth and quality of Pseudostellaria heterophylla

Wang

et al. 2022

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Phosphorus (P) deficiency in agricultural soil is a worldwide concern. P modification of biochar, a common soil conditioner produced by pyrolysis of wastes and residues, can increase P availability and improve soil quality. This study aims to investigate the effects of P-modified biochar as a soil amendment on the growth and quality of a medicinal plant (Pseudostellaria heterophylla). P. heterophylla were grown for 4 months in lateritic soil amended with P-modified and unmodified biochar (peanut shell) at dosages of 0, 3% and 5% (by mass). Compared with unmodified biochar, P-modified biochar reduced available heavy metal Cd in soil by up to 73.0% and osmotic suction in the root zone by up to 49.3%. P-modified biochar application at 3% and 5% promoted the tuber yield of P. heterophylla significantly by 68.6% and 136.0% respectively. This was different from that in unmodified biochar treatment, where tuber yield was stimulated at 3% dosage but inhibited at 5% dosage. The concentrations of active ingredients (i.e., polysaccharides, saponins) in tuber were increased by 2.9–78.8% under P-modified biochar amendment compared with control, indicating the better tuber quality. This study recommended the application of 5% P-modified biochar for promoting the yield and quality of P. heterophylla.

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AN XPS study of the interaction of model Ba/TiO2 AND Ba/ZrO2 NSR catalysts with NO2

Cited by 7 publications

References 20 publications

Model sulfur-resistant NSR catalysts: An XPS study of the interaction of BaO/TiO2-ZrO2 and Pt-BaO/TiO2-ZrO2 with NO2

Model sulfur-resistant NSR catalysts: An XPS study of the interaction of BaO/TiO2-ZrO2 and Pt-BaO/TiO2-ZrO2 with NO2

FeCrAl as a Catalyst Support

Effects of phosphorus-modified biochar as a soil amendment on the growth and quality of Pseudostellaria heterophylla

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