About: CO and NO adsorption on VOx/SBA-15 catalysts: an FT-IR spectroscopic study

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
rdfs:seeAlso	http://link.springer.com/article/10.1007%2Fs10450-012-9456-5
Description	The adsorption of CO and NO over VO (x) -SBA-15 mesoporous materials with different vanadium content was investigated by FT-IR spectroscopy. Vanadium complexes were reduced in situ by hydrogen atmosphere at 450 A degrees C for 3 h. Spectra of reduced samples show increasing in intensity of silanol groups, caused by dissociation of V-O(Si) bonds and formation of new H-O(Si) bonds. Reduction occurs with formation of water. The band corresponds to overtone of V=O stretching modes decreases in intensity because of oxygen withdrawing from V=O species. Presence of V4+ and V3+ species was observed. Inspection of CO adsorbed IR spectra evidenced existence at least two different type of V3+-CO complexes on the silica surface differing in both stretching frequencies and complex stabilities. We did not found principal difference between spectra of absorbed CO at -196 A degrees C on the samples with different concentration of vanadium, probably because of relative low degree of reduction. As well as heterogeneity of surface V3+ and V4+ species was evidenced by adsorption of NO. Both V3+ and V4+ ions possess two effective coordinative vacancies and as a result can adsorb two NO molecules forming dinitrosyls. A part of V3+ cations forms only mononitrosyls characterize by band at 1724 cm(-1). Results obtained after NO adsorption reveal existence of three different kinds of vanadium species. Probably two of them are isolated and associated vanadium sites. The third type of vanadium has different surrounding than other two types. It was demonstrated that NO is a better probe than CO for testing the oxidation and coordination state of reduced vanadium species. The adsorption of CO and NO over VO (x) -SBA-15 mesoporous materials with different vanadium content was investigated by FT-IR spectroscopy. Vanadium complexes were reduced in situ by hydrogen atmosphere at 450 A degrees C for 3 h. Spectra of reduced samples show increasing in intensity of silanol groups, caused by dissociation of V-O(Si) bonds and formation of new H-O(Si) bonds. Reduction occurs with formation of water. The band corresponds to overtone of V=O stretching modes decreases in intensity because of oxygen withdrawing from V=O species. Presence of V4+ and V3+ species was observed. Inspection of CO adsorbed IR spectra evidenced existence at least two different type of V3+-CO complexes on the silica surface differing in both stretching frequencies and complex stabilities. We did not found principal difference between spectra of absorbed CO at -196 A degrees C on the samples with different concentration of vanadium, probably because of relative low degree of reduction. As well as heterogeneity of surface V3+ and V4+ species was evidenced by adsorption of NO. Both V3+ and V4+ ions possess two effective coordinative vacancies and as a result can adsorb two NO molecules forming dinitrosyls. A part of V3+ cations forms only mononitrosyls characterize by band at 1724 cm(-1). Results obtained after NO adsorption reveal existence of three different kinds of vanadium species. Probably two of them are isolated and associated vanadium sites. The third type of vanadium has different surrounding than other two types. It was demonstrated that NO is a better probe than CO for testing the oxidation and coordination state of reduced vanadium species. (en)
Title	CO and NO adsorption on VOx/SBA-15 catalysts: an FT-IR spectroscopic study CO and NO adsorption on VOx/SBA-15 catalysts: an FT-IR spectroscopic study (en)
skos:prefLabel	CO and NO adsorption on VOx/SBA-15 catalysts: an FT-IR spectroscopic study CO and NO adsorption on VOx/SBA-15 catalysts: an FT-IR spectroscopic study (en)
skos:notation	RIV/00216275:25310/13:39896340!RIV14-GA0-25310___
http://linked.open...avai/predkladatel	Fakulta chemicko-technologická
http://linked.open...avai/riv/aktivita	P
http://linked.open...avai/riv/aktivity	P(EE2.3.30.0021), P(GAP106/10/0196)
http://linked.open...iv/cisloPeriodika	2-4
http://linked.open...vai/riv/dodaniDat	2014
http://linked.open...aciTvurceVysledku	Bulánek, Roman Čičmanec, Pavel Setnička, Michal Drenchev, Nikola Lyudmilov
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Univerzita Pardubice / Fakulta chemicko-technologická
http://linked.open...dnocenehoVysledku	65788
http://linked.open...ai/riv/idVysledku	RIV/00216275:25310/13:39896340
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	nitrosyls; carbonyls; FT-IR; SBA-15; vanadium (en)
http://linked.open.../riv/klicoveSlovo	carbonyls SBA-15 nitrosyls vanadium FT-IR
http://linked.open...odStatuVydavatele	NL - Nizozemsko
http://linked.open...ontrolniKodProRIV	[AEADA2045292]
http://linked.open...i/riv/nazevZdroje	Adsorption - Journal of the International Adsorption Society
http://linked.open...in/vavai/riv/obor	CF
http://linked.open...ichTvurcuVysledku	4 (xsd:int)
http://linked.open...cetTvurcuVysledku	4 (xsd:int)
http://linked.open...vavai/riv/projekt	Strenthening of Research and Development Teams at the University of Pardubice Advanced nanostructured vanadium-based catalysts for oxidative dehydrogenations
http://linked.open...UplatneniVysledku	2013
http://linked.open...v/svazekPeriodika	19
http://linked.open...iv/tvurceVysledku	Bulánek, Roman Setnička, Michal Čičmanec, Pavel Drenchev, Nikola Lyudmilov
http://linked.open...ain/vavai/riv/wos	000317620800016
issn	0929-5607
number of pages	9 (xsd:int)
http://bibframe.org/vocab/doi	10.1007/s10450-012-9456-5
http://localhost/t...ganizacniJednotka	25310

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