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Statements

Subject Item
n2:RIV%2F61388955%3A_____%2F12%3A00375912%21RIV13-AV0-61388955
rdf:type
skos:Concept n5:Vysledek
dcterms:description
Aromatization of hexane and propane was investigated over Pt promoted mesoporous gallium-containing HZSM-11 with controlled mesoporosity generated by desilication. Prepared catalysts were characterized by nitrogen adsorption, X-ray powder diffraction, scanning electron microscopy, Fourier transform infrared of chemisorbed pyridine, and NH3 temperature programmed desorption confirming the development of intracrystalline mesoporosity of Ga-containing HZSM-11. The catalytic activities, which were compared in the aromatization of n-hexane and propane, increased upon desilication. The aromatization of n-hexane decreased in the following order, Pt/mesoporous GaZSM-11 > Pt/conventional GaZSM-11 > mesoporous GaZSM-11 > conventional GaZSM-11. Hexane conversion reached 70.1% over mesoporous Pt/GaZSM-11 with Si/Ga of 61, as compared with 29.6 and 24.9% for corresponding mesoporous and conventional GaZSM-11 (Si/Ga = 94), respectively, for experiments at liquid hour space velocity of 3.6 h(-1), and 540 degrees C. Comparison of BTX (benzene-toluene-xylene) selectivity at the conversion level of similar to 21.0% revealed that Pt/mesoporous GaZSM-11 is more selective than corresponding mesoporous and conventional GaZSM-11. The BTX selectivity over Pt/mesoporous GaZSM-11 (Si/Ga = 94), which showed strong dependence on the conversion, reached 28.2%, whereas over corresponding mesoporous and conventional GaZSM-11catalysts reached 19.1% and 5.5%, respectively. A higher conversion and better selectivity can be attributed to the improved accessibility to the active extra-framework Ga species owing to the generation of mesopores inside the zeolite particles and shortening the contact time. It is worth mentioning that the prepared catalysts exhibited quite low activity in propane aromatization but exhibiting similar trends as for hexane aromatization. Aromatization of hexane and propane was investigated over Pt promoted mesoporous gallium-containing HZSM-11 with controlled mesoporosity generated by desilication. Prepared catalysts were characterized by nitrogen adsorption, X-ray powder diffraction, scanning electron microscopy, Fourier transform infrared of chemisorbed pyridine, and NH3 temperature programmed desorption confirming the development of intracrystalline mesoporosity of Ga-containing HZSM-11. The catalytic activities, which were compared in the aromatization of n-hexane and propane, increased upon desilication. The aromatization of n-hexane decreased in the following order, Pt/mesoporous GaZSM-11 > Pt/conventional GaZSM-11 > mesoporous GaZSM-11 > conventional GaZSM-11. Hexane conversion reached 70.1% over mesoporous Pt/GaZSM-11 with Si/Ga of 61, as compared with 29.6 and 24.9% for corresponding mesoporous and conventional GaZSM-11 (Si/Ga = 94), respectively, for experiments at liquid hour space velocity of 3.6 h(-1), and 540 degrees C. Comparison of BTX (benzene-toluene-xylene) selectivity at the conversion level of similar to 21.0% revealed that Pt/mesoporous GaZSM-11 is more selective than corresponding mesoporous and conventional GaZSM-11. The BTX selectivity over Pt/mesoporous GaZSM-11 (Si/Ga = 94), which showed strong dependence on the conversion, reached 28.2%, whereas over corresponding mesoporous and conventional GaZSM-11catalysts reached 19.1% and 5.5%, respectively. A higher conversion and better selectivity can be attributed to the improved accessibility to the active extra-framework Ga species owing to the generation of mesopores inside the zeolite particles and shortening the contact time. It is worth mentioning that the prepared catalysts exhibited quite low activity in propane aromatization but exhibiting similar trends as for hexane aromatization.
dcterms:title
Aromatization of alkanes over Pt promoted conventional and mesoporous gallosilicates of MEL zeolite Aromatization of alkanes over Pt promoted conventional and mesoporous gallosilicates of MEL zeolite
skos:prefLabel
Aromatization of alkanes over Pt promoted conventional and mesoporous gallosilicates of MEL zeolite Aromatization of alkanes over Pt promoted conventional and mesoporous gallosilicates of MEL zeolite
skos:notation
RIV/61388955:_____/12:00375912!RIV13-AV0-61388955
n5:predkladatel
n6:ico%3A61388955
n3:aktivita
n16:Z
n3:aktivity
Z(AV0Z40400503)
n3:cisloPeriodika
1
n3:dodaniDat
n8:2013
n3:domaciTvurceVysledku
n9:7016662
n3:druhVysledku
n12:J
n3:duvernostUdaju
n18:S
n3:entitaPredkladatele
n7:predkladatel
n3:idSjednocenehoVysledku
123669
n3:idVysledku
RIV/61388955:_____/12:00375912
n3:jazykVysledku
n13:eng
n3:klicovaSlova
alkane aromatization; ZSM-11; GaHZSM-11
n3:klicoveSlovo
n10:GaHZSM-11 n10:ZSM-11 n10:alkane%20aromatization
n3:kodStatuVydavatele
NL - Nizozemsko
n3:kontrolniKodProRIV
[0D814ECD00B7]
n3:nazevZdroje
Catalysis Today
n3:obor
n17:CF
n3:pocetDomacichTvurcuVysledku
1
n3:pocetTvurcuVysledku
4
n3:rokUplatneniVysledku
n8:2012
n3:svazekPeriodika
179
n3:tvurceVysledku
Al-Khattaf, S. Čejka, Jiří Akhtar, M. N. Al-Yassir, N.
n3:wos
000298404600008
n3:zamer
n14:AV0Z40400503
s:issn
0920-5861
s:numberOfPages
12
n15:doi
10.1016/j.cattod.2011.06.036