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Statements

Subject Item
n2:RIV%2F61388955%3A_____%2F10%3A00437054%21RIV15-AV0-61388955
rdf:type
skos:Concept n15:Vysledek
dcterms:description
Catalytic behavior of mesoporous ZSM-5 was investigated in toluene disproportionation, toluene alkylation with isopropyl alcohol, and p-xylene alkylation with isopropyl alcohol to understand the effect of the presence of mesopores. Three ZSM-5 zeolites (conventional one and two mesoporous differing in the mesopore volume) having similar Si/Al ratio were synthesized and characterized as for their acidity (internal and external) as well as their micropore/mesopore volume. No substantial differences among three samples were observed as for the type and concentration of Bronsted and Lewis acid sites as well as their location in zeolite channels or on external surface of zeolite crystals. Conversions of toluene and p-xylene increased with increasing volume of mesopores in ZSM-5 zeolite while the selectivity to individual products depended on the type of reaction. In general, selectivity to sum of xylenes in toluene disproportionation, sum of isopropyltoluenes in toluene alkylation and to 1-isopropyl-2,5-dimethylbenzene in p-xylene alkylation increased due to a shorter contact time molecules spent in mesoporous ZSM-5 catalysts. In contrast, para-selectivity decreased as diffusion pathways were shorten due to the presence of mesopores. Catalytic behavior of mesoporous ZSM-5 was investigated in toluene disproportionation, toluene alkylation with isopropyl alcohol, and p-xylene alkylation with isopropyl alcohol to understand the effect of the presence of mesopores. Three ZSM-5 zeolites (conventional one and two mesoporous differing in the mesopore volume) having similar Si/Al ratio were synthesized and characterized as for their acidity (internal and external) as well as their micropore/mesopore volume. No substantial differences among three samples were observed as for the type and concentration of Bronsted and Lewis acid sites as well as their location in zeolite channels or on external surface of zeolite crystals. Conversions of toluene and p-xylene increased with increasing volume of mesopores in ZSM-5 zeolite while the selectivity to individual products depended on the type of reaction. In general, selectivity to sum of xylenes in toluene disproportionation, sum of isopropyltoluenes in toluene alkylation and to 1-isopropyl-2,5-dimethylbenzene in p-xylene alkylation increased due to a shorter contact time molecules spent in mesoporous ZSM-5 catalysts. In contrast, para-selectivity decreased as diffusion pathways were shorten due to the presence of mesopores.
dcterms:title
Aromatic Transformations Over Mesoporous ZSM-5: Advantages and Disadvantages Aromatic Transformations Over Mesoporous ZSM-5: Advantages and Disadvantages
skos:prefLabel
Aromatic Transformations Over Mesoporous ZSM-5: Advantages and Disadvantages Aromatic Transformations Over Mesoporous ZSM-5: Advantages and Disadvantages
skos:notation
RIV/61388955:_____/10:00437054!RIV15-AV0-61388955
n3:aktivita
n9:Z
n3:aktivity
Z(AV0Z40400503)
n3:cisloPeriodika
19-20
n3:dodaniDat
n14:2015
n3:domaciTvurceVysledku
n5:6503284 n5:7016662 n5:9803076
n3:druhVysledku
n18:J
n3:duvernostUdaju
n12:S
n3:entitaPredkladatele
n10:predkladatel
n3:idSjednocenehoVysledku
247747
n3:idVysledku
RIV/61388955:_____/10:00437054
n3:jazykVysledku
n16:eng
n3:klicovaSlova
mesoporous ZSM-5; alkylation; disproportionation
n3:klicoveSlovo
n13:alkylation n13:mesoporous%20ZSM-5 n13:disproportionation
n3:kodStatuVydavatele
NL - Nizozemsko
n3:kontrolniKodProRIV
[120D5EBB434B]
n3:nazevZdroje
Topics in Catalysis
n3:obor
n8:CF
n3:pocetDomacichTvurcuVysledku
3
n3:pocetTvurcuVysledku
4
n3:rokUplatneniVysledku
n14:2010
n3:svazekPeriodika
53
n3:tvurceVysledku
Čejka, Jiří Musilová, Zuzana Žilková, Naděžda Park, S.-E.
n3:wos
000283584800022
n3:zamer
n17:AV0Z40400503
s:issn
1022-5528
s:numberOfPages
13
n6:doi
10.1007/s11244-010-9606-5