Search Results - "Hadjiivanov, Konstantin I."

Reassignment of the Vibrational Spectra of Carbonates, Formates, and Related Surface Species on Ceria: A Combined Density Functional and Infrared Spectroscopy Investigation by Vayssilov, Georgi N, Mihaylov, Mihail, Petkov, Petko St, Hadjiivanov, Konstantin I, Neyman, Konstantin M

“…Using a combination of state-of-the-art computational modeling and Fourier transform infrared (FTIR) spectroscopy study of the surface species formed during…”
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N2 as an Efficient IR Probe Molecule for the Investigation of Ceria-Containing Materials by Chakarova, Kristina K., Mihaylov, Mihail Y., Karapenchev, Bayan S., Koleva, Iskra Z., Vayssilov, Georgi N., Aleksandrov, Hristiyan A., Hadjiivanov, Konstantin I.

“…Ceria and ceria-based catalysts are very important in redox and acid-base catalysis. Nanoceria have also been found to be important in biomedical applications…”
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Characterization of oxide surfaces and zeolites by carbon monoxide as an IR probe molecule by Hadjiivanov, Konstantin I., Vayssilov, Georgi N.

“…The review is a summary and analysis of the data characterizing CO adsorption on surface cationic sites of oxides including supported materials and microporous…”
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In Situ FTIR Spectroscopy for Scanning Accessible Active Sites in Defect-Engineered UiO-66 by Butova, Vera V, Zdravkova, Videlina R, Burachevskaia, Olga A, Tereshchenko, Andrei A, Shestakova, Pavletta S, Hadjiivanov, Konstantin I

“…Three UiO-66 samples were prepared by solvothermal synthesis using the defect engineering approach with benzoic acid as a modulator. They were characterized by…”
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Effect of Water on CO2 Adsorption on CaNaY Zeolite: Formation of Ca2+(H2O)(CO2), Ca2+(H2O)(CO2)2 and Ca2+(H2O)2(CO2) Complexes by Drenchev, Nikola L., Shivachev, Boris L., Dimitrov, Lubomir D., Hadjiivanov, Konstantin I.

“…Efficient CO2 capture materials must possess a high adsorption capacity, suitable CO2 adsorption enthalpy and resistance to water vapor. We have recently…”
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Power of Infrared and Raman Spectroscopies to Characterize Metal-Organic Frameworks and Investigate Their Interaction with Guest Molecules by Hadjiivanov, Konstantin I, Panayotov, Dimitar A, Mihaylov, Mihail Y, Ivanova, Elena Z, Chakarova, Kristina K, Andonova, Stanislava M, Drenchev, Nikola L

“…The variety of functionalities and porous structures inherent to metal-organic frameworks (MOFs) together with the facile tunability of their properties makes…”
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One Ca2+ Site in CaNaY Zeolite Can Attach Three CO2 Molecules by Drenchev, Nikola L., Ivanova, Elena Z., Mihaylov, Mihail Y., Aleksandrov, Hristiyan A., Vayssilov, Georgi N., Hadjiivanov, Konstantin I.

“…To design efficient CO2 capture materials, it is necessary to ensure a high adsorption capacity. We recently reported that one Na+ site in NaY zeolite can…”
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One Ca 2+ Site in CaNaY Zeolite Can Attach Three CO 2 Molecules by Drenchev, Nikola L, Ivanova, Elena Z, Mihaylov, Mihail Y, Aleksandrov, Hristiyan A, Vayssilov, Georgi N, Hadjiivanov, Konstantin I

“…To design efficient CO capture materials, it is necessary to ensure a high adsorption capacity. We recently reported that one Na site in NaY zeolite can attach…”
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Modulator‐Controlled Synthesis of Microporous STA‐26, an Interpenetrated 8,3‐Connected Zirconium MOF with the the‐i Topology, and its Reversible Lattice Shift by Bumstead, Alice M., Cordes, David B., Dawson, Daniel M., Chakarova, Kristina K., Mihaylov, Mihail Y., Hobday, Claire L., Düren, Tina, Hadjiivanov, Konstantin I., Slawin, Alexandra M. Z., Ashbrook, Sharon E., Prasad, Ram R. R., Wright, Paul A.

“…A fully interpenetrated 8,3‐connected zirconium MOF with the the‐i topology type, STA‐26 (St Andrews porous material‐26), has been prepared using the…”
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Formation of N3(-) during interaction of NO with reduced ceria by Mihaylov, Mihail Y, Ivanova, Elena Z, Aleksandrov, Hristiyan A, St Petkov, Petko, Vayssilov, Georgi N, Hadjiivanov, Konstantin I

“…We show that the first stages of interaction between NO and reduced ceria comprise the formation of azides, N3(-), with simultaneous oxidation of Ce(3+) to…”
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Precise Identification of the Infrared Bands of the Polycarbonyl Complexes on Ni–MOR Zeolite by 12C16O–13C18O Coadsorption and Computational Modeling by Aleksandrov, Hristiyan A, Zdravkova, Videlina R, Mihaylov, Mihail Y, Petkov, Petko St, Vayssilov, Georgi N, Hadjiivanov, Konstantin I

“…We report a combined computational and experimental IR study of polycarbonyl species on Ni–MOR zeolite formed after adsorption of 12C16O/13C18O isotopic…”
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FTIR and density functional study of NO interaction with reduced ceria: Identification of N3− and NO2− as new intermediates in NO conversion by Mihaylov, Mihail Y., Ivanova, Elena Z., Aleksandrov, Hristiyan A., Petkov, Petko St, Vayssilov, Georgi N., Hadjiivanov, Konstantin I.

“…[Display omitted] •NO produces N3− and NO2− species when interacting with reduced ceria.•N3− is inert toward NO or O2 alone but easily interacts with NO+O2…”
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First results on Fe solid-phase extraction from coastal seawater using anatase TiO₂ nano-particles by Quétel, Christophe R, Vassileva, Emilia, Petrov, Ivan, Chakarova, Kristina, Hadjiivanov, Konstantin I

“…This paper describes the application of TiO₂ nano-particles (anatase form) for the solid-phase extraction of iron from coastal seawater samples. We…”
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Formation of Nonclassical Carbonyls of Au3+ in Zeolite NaY:  Characterization by Infrared Spectroscopy by Mihaylov, Mihail Y, Fierro-Gonzalez, Juan C, Knözinger, Helmut, Gates, Bruce C, Hadjiivanov, Konstantin I

“…Adsorption of CO on gold supported in zeolite NaY at 85 K led to the formation of (i) various carbonyls and isocarbonyls typical of the zeolite and (ii)…”
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Unusual Carbonyl−Nitrosyl Complexes of Rh2+ in Rh−ZSM-5:  A Combined FTIR Spectroscopy and Computational Study by Ivanova, Elena, Mihaylov, Mihail, Aleksandrov, Hristiyan A, Daturi, Marco, Thibault-Starzyk, Frederic, Vayssilov, Georgi N, Rösch, Notker, Hadjiivanov, Konstantin I

“…Adsorption of CO on Rh−ZSM-5 leads to the formation of the well-known Rh+(CO)2 gem-dicarbonyls, with vibrational frequencies νs(CO) at 2114 cm-1 and νas(CO) at…”
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Revisiting ceria-NOx interaction: FTIR studies by Mihaylov, Mihail Y., Ivanova, Elena Z., Vayssilov, Georgi N., Hadjiivanov, Konstantin I.

“…[Display omitted] •NO disproportionates on stoichiometric ceria to nitrites and trans-hyponitrites.•NO + O2 coadsorption on ceria leads to formation of…”
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FTIR traced modification of defect-engineered UiO-66 for enhanced accessibility of zirconium sites by Butova, Vera V., Zdravkova, Videlina R., Burachevskaia, Olga A., Gorban, Ivan E., Soldatov, Mikhail A., Hadjiivanov, Konstantin I.

“…This research focuses on identifying the accessibility of active sites within the defect-engineered UiO-66 framework. The task is particularly challenging due…”
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N[sub.2] as an Efficient IR Probe Molecule for the Investigation of Ceria-Containing Materials by Chakarova, Kristina K, Mihaylov, Mihail Y, Karapenchev, Bayan S, Koleva, Iskra Z, Vayssilov, Georgi N, Aleksandrov, Hristiyan A, Hadjiivanov, Konstantin I

“…Ceria and ceria-based catalysts are very important in redox and acid-base catalysis. Nanoceria have also been found to be important in biomedical applications…”
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Evolution of Ce4+ Lewis acidity during dehydroxylation of ceria nanoparticles with different morphology: An integrated FTIR, DFT and HRTEM study by Chakarova, Kristina K., Zdravkova, Videlina R., Karapenchev, Bayan S., Nihtianova, Diana D., Ivanova, Elena Z., Aleksandrov, Hristiyan A., Koleva, Iskra Z., Panayotov, Dimitar A., Mihaylov, Mihail Y., Vayssilov, Georgi N., Hadjiivanov, Konstantin I.

“…[Display omitted] •Bridging OH groups on ceria (100) face are removed gradually between 473 and 573 K.•The created open Ce4+ sites on the (001) face bind CO in…”
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Effect of Water on CO[sub.2] Adsorption on CaNaY Zeolite: Formation of Ca[sup.2+] Complexes by Drenchev, Nikola L, Shivachev, Boris L, Dimitrov, Lubomir D, Hadjiivanov, Konstantin I

“…Efficient CO[sub.2] capture materials must possess a high adsorption capacity, suitable CO[sub.2] adsorption enthalpy and resistance to water vapor. We have…”
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