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Statements

Subject Item
n2:RIV%2F00216275%3A25310%2F12%3A39895242%21RIV13-GA0-25310___
rdf:type
n13:Vysledek skos:Concept
dcterms:description
This work reports comparative study of catalytic performance of VOx-HMS catalysts prepared by ethanolic impregnation method and direct synthesis. In order to detailed investigation of vanadium speciation depending on vanadium content and its impact on catalytic behavior in C3-ODH, number of samples in wide range of vanadium content (1-16 wt.%) was prepared by both types of preparation. Prepared catalysts were tested in the oxidative dehydrogenation of propane at 540 degrees C under different contact times and catalytic results were correlated with physicochemical characteristics of the catalysts examined by XRD, XRF, SEM, N-2 adsorption/desorption isotherms, H-2-TPR and DR-UV-visible spectroscopy. Study led to conclusion, that (i) both monomeric VOx complexes and oligomeric VOx complexes with tetrahedral coordination containing V-O-V bonds are active and selective catalytic sites for C3-ODH, (ii) active VOx species are characterized by distinct reduction peak in H-2-TPR pattern centered at 570-590 degrees C, (iii) VOx-HMS vanadosilicates can be directly synthesized under ambient conditions without need for autoclave in wide range of vanadia loading with preservation of good catalytic performance and (iv) the catalytic results in C3-ODH were significantly better for synthesized catalysts compared to impregnated catalysts resulting in three times higher propene productivity of the best synthesized catalyst compared to the best impregnated one under the same reaction conditions. The higher is vanadium loading the more distinct is the difference in catalytic performance of both types of catalysts. This work reports comparative study of catalytic performance of VOx-HMS catalysts prepared by ethanolic impregnation method and direct synthesis. In order to detailed investigation of vanadium speciation depending on vanadium content and its impact on catalytic behavior in C3-ODH, number of samples in wide range of vanadium content (1-16 wt.%) was prepared by both types of preparation. Prepared catalysts were tested in the oxidative dehydrogenation of propane at 540 degrees C under different contact times and catalytic results were correlated with physicochemical characteristics of the catalysts examined by XRD, XRF, SEM, N-2 adsorption/desorption isotherms, H-2-TPR and DR-UV-visible spectroscopy. Study led to conclusion, that (i) both monomeric VOx complexes and oligomeric VOx complexes with tetrahedral coordination containing V-O-V bonds are active and selective catalytic sites for C3-ODH, (ii) active VOx species are characterized by distinct reduction peak in H-2-TPR pattern centered at 570-590 degrees C, (iii) VOx-HMS vanadosilicates can be directly synthesized under ambient conditions without need for autoclave in wide range of vanadia loading with preservation of good catalytic performance and (iv) the catalytic results in C3-ODH were significantly better for synthesized catalysts compared to impregnated catalysts resulting in three times higher propene productivity of the best synthesized catalyst compared to the best impregnated one under the same reaction conditions. The higher is vanadium loading the more distinct is the difference in catalytic performance of both types of catalysts.
dcterms:title
Effect of preparation method on nature and distribution of vanadium species in vanadium-based hexagonal mesoporous silica catalysts: Impact on catalytic behavior in propane ODH Effect of preparation method on nature and distribution of vanadium species in vanadium-based hexagonal mesoporous silica catalysts: Impact on catalytic behavior in propane ODH
skos:prefLabel
Effect of preparation method on nature and distribution of vanadium species in vanadium-based hexagonal mesoporous silica catalysts: Impact on catalytic behavior in propane ODH Effect of preparation method on nature and distribution of vanadium species in vanadium-based hexagonal mesoporous silica catalysts: Impact on catalytic behavior in propane ODH
skos:notation
RIV/00216275:25310/12:39895242!RIV13-GA0-25310___
n13:predkladatel
n14:orjk%3A25310
n4:aktivita
n21:Z n21:P
n4:aktivity
P(GAP106/10/0196), P(LC512), Z(MSM0021627501)
n4:cisloPeriodika
February
n4:dodaniDat
n7:2013
n4:domaciTvurceVysledku
n6:7420900 n6:5655730 n6:5796237 n6:3414094 n6:4663659
n4:druhVysledku
n5:J
n4:duvernostUdaju
n19:S
n4:entitaPredkladatele
n17:predkladatel
n4:idSjednocenehoVysledku
133210
n4:idVysledku
RIV/00216275:25310/12:39895242
n4:jazykVysledku
n11:eng
n4:klicovaSlova
HMS; UV-vis; TPR; mesoporous silica; propene; propane; ODH; vanadium
n4:klicoveSlovo
n8:vanadium n8:ODH n8:propene n8:HMS n8:mesoporous%20silica n8:TPR n8:UV-vis n8:propane
n4:kodStatuVydavatele
NL - Nizozemsko
n4:kontrolniKodProRIV
[6E8106FB15D1]
n4:nazevZdroje
Applied catalysis A: General
n4:obor
n20:CF
n4:pocetDomacichTvurcuVysledku
5
n4:pocetTvurcuVysledku
6
n4:projekt
n15:GAP106%2F10%2F0196 n15:LC512
n4:rokUplatneniVysledku
n7:2012
n4:svazekPeriodika
415-416
n4:tvurceVysledku
Čapek, Libor Bulánek, Roman Knotek, Petr Setnička, Michal Sheng-Yang, Hsu Čičmanec, Pavel
n4:wos
000301020800005
n4:zamer
n18:MSM0021627501
s:issn
0926-860X
s:numberOfPages
11
n9:doi
10.1016/j.apcata.2011.11.033
n12:organizacniJednotka
25310