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Statements

Subject Item
n2:RIV%2F61388955%3A_____%2F13%3A00389148%21RIV14-GA0-61388955
rdf:type
n5:Vysledek skos:Concept
dcterms:description
Isomorphously substituted UTL zeolite with heteroatoms Al, Ga and Fe was synthesized, characterized by X-ray powder diffraction, scanning electron images, nitrogen adsorption isotherms and pyridine adsorption followed by FTIR spectroscopy and tested in disproportionation of toluene, toluene alkylation with isopropyl alcohol and trimethylbenzene disproportionation/isomerization. The catalytic properties of UTL zeolites were compared with those of BEA and MFI zeolites and the observed differences are discussed. Isomorphously substituted (Al, Ga, Fe) UTL zeolites show in most cases lower conversions for the reactions studied but higher selectivities to more valuable products. For toluene disproportionation reaction UTL zeolites shown higher selectivity to xylenes compared with BEA and MFI. In toluene alkylation with isopropyl alcohol no n-propyltoluenes are formed over (Ga)UTL or (Fe)UTL while some traces of this undesired product were observed over (Al)UTL. (Al)UTL shows high selectivity to cymenes and iso-/n-propyltoluene ratio orders of magnitude higher than for MFI. The initial selectivity to xylenes in trimethylbenzene disproportionation/isomerization decreases in the order (Ga)UTL > (Al)UTL BEA >> MFI and correlates with increasing of acid centres strength, showing that isomorphously substituted extra-large pore zeolites can be enough active and more selective catalysts in some aromatic hydrocarbon transformation reaction. Isomorphously substituted UTL zeolite with heteroatoms Al, Ga and Fe was synthesized, characterized by X-ray powder diffraction, scanning electron images, nitrogen adsorption isotherms and pyridine adsorption followed by FTIR spectroscopy and tested in disproportionation of toluene, toluene alkylation with isopropyl alcohol and trimethylbenzene disproportionation/isomerization. The catalytic properties of UTL zeolites were compared with those of BEA and MFI zeolites and the observed differences are discussed. Isomorphously substituted (Al, Ga, Fe) UTL zeolites show in most cases lower conversions for the reactions studied but higher selectivities to more valuable products. For toluene disproportionation reaction UTL zeolites shown higher selectivity to xylenes compared with BEA and MFI. In toluene alkylation with isopropyl alcohol no n-propyltoluenes are formed over (Ga)UTL or (Fe)UTL while some traces of this undesired product were observed over (Al)UTL. (Al)UTL shows high selectivity to cymenes and iso-/n-propyltoluene ratio orders of magnitude higher than for MFI. The initial selectivity to xylenes in trimethylbenzene disproportionation/isomerization decreases in the order (Ga)UTL > (Al)UTL BEA >> MFI and correlates with increasing of acid centres strength, showing that isomorphously substituted extra-large pore zeolites can be enough active and more selective catalysts in some aromatic hydrocarbon transformation reaction.
dcterms:title
Transformation of aromatic hydrocarbons over isomorphously substituted UTL: Comparison with large and medium pore zeolites Transformation of aromatic hydrocarbons over isomorphously substituted UTL: Comparison with large and medium pore zeolites
skos:prefLabel
Transformation of aromatic hydrocarbons over isomorphously substituted UTL: Comparison with large and medium pore zeolites Transformation of aromatic hydrocarbons over isomorphously substituted UTL: Comparison with large and medium pore zeolites
skos:notation
RIV/61388955:_____/13:00389148!RIV14-GA0-61388955
n5:predkladatel
n15:ico%3A61388955
n3:aktivita
n16:P n16:I
n3:aktivity
I, P(GAP106/12/0189)
n3:cisloPeriodika
APR 2013
n3:dodaniDat
n4:2014
n3:domaciTvurceVysledku
n10:6503284 n10:7016662
n3:druhVysledku
n14:J
n3:duvernostUdaju
n9:S
n3:entitaPredkladatele
n6:predkladatel
n3:idSjednocenehoVysledku
111575
n3:idVysledku
RIV/61388955:_____/13:00389148
n3:jazykVysledku
n17:eng
n3:klicovaSlova
UTL zeolite; Isomorphous substitution; Toluene alkylation with isopropyl alcohol
n3:klicoveSlovo
n11:UTL%20zeolite n11:Toluene%20alkylation%20with%20isopropyl%20alcohol n11:Isomorphous%20substitution
n3:kodStatuVydavatele
NL - Nizozemsko
n3:kontrolniKodProRIV
[0F0B5D187199]
n3:nazevZdroje
Catalysis Today
n3:obor
n12:CF
n3:pocetDomacichTvurcuVysledku
2
n3:pocetTvurcuVysledku
4
n3:projekt
n18:GAP106%2F12%2F0189
n3:rokUplatneniVysledku
n4:2013
n3:svazekPeriodika
204
n3:tvurceVysledku
Žilková, Naděžda Shvets, O. V. Shamzy, M. V. Čejka, Jiří
n3:wos
000314825900005
s:issn
0920-5861
s:numberOfPages
8
n13:doi
10.1016/j.cattod.2012.10.002