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Statements

Subject Item
n2:RIV%2F61388955%3A_____%2F13%3A00387274%21RIV14-GA0-61388955
rdf:type
skos:Concept n11:Vysledek
dcterms:description
Researchers at Chevron recently discovered a route for making high silica stilbite (STI), a zeolite with intersecting 10- and 8-ring channels. This zeolite, named SSZ-75, provides an interesting comparison to two other two-dimensional 10/8-ring zeolites, namely, ferrierite (FER) and ZSM-57 (MFS). The catalytic properties of these zeolites are characterized here using the Constraint Index test, adsorption measurements, and toluene disproportionation and its alkylation with isopropyl alcohol. Results are then compared to ZSM-5 (a well-characterized 3-dimensional 10-ring zeolite) and TON (a 1-dimensional 10-ring zeolite). While the micropore volumes for several of these five materials are similar, the Constraint Index, which considers the competitive cracking of n-hexane and 3-methylpentane, differs greatly. On the other hand, toluene conversions along with selectivity to p-xylene for MFI and STI are remarkably similar. This indicates that the reaction volume available at the intersections of the 10- and 8-ring channels in STI is comparable with that of the 10-ring channel intersections in MFI. However, in toluene alkylation with isopropyl alcohol, differences in intersection volume between MFI and STI are revealed. These results nicely demonstrate how the size of the pores and geometry of the channel intersections (rather than just the size of the individual pores) impact the catalytic properties of zeolites with multidimensional channel systems. Researchers at Chevron recently discovered a route for making high silica stilbite (STI), a zeolite with intersecting 10- and 8-ring channels. This zeolite, named SSZ-75, provides an interesting comparison to two other two-dimensional 10/8-ring zeolites, namely, ferrierite (FER) and ZSM-57 (MFS). The catalytic properties of these zeolites are characterized here using the Constraint Index test, adsorption measurements, and toluene disproportionation and its alkylation with isopropyl alcohol. Results are then compared to ZSM-5 (a well-characterized 3-dimensional 10-ring zeolite) and TON (a 1-dimensional 10-ring zeolite). While the micropore volumes for several of these five materials are similar, the Constraint Index, which considers the competitive cracking of n-hexane and 3-methylpentane, differs greatly. On the other hand, toluene conversions along with selectivity to p-xylene for MFI and STI are remarkably similar. This indicates that the reaction volume available at the intersections of the 10- and 8-ring channels in STI is comparable with that of the 10-ring channel intersections in MFI. However, in toluene alkylation with isopropyl alcohol, differences in intersection volume between MFI and STI are revealed. These results nicely demonstrate how the size of the pores and geometry of the channel intersections (rather than just the size of the individual pores) impact the catalytic properties of zeolites with multidimensional channel systems.
dcterms:title
The importance of channel intersections in the catalytic performance of high silica stilbite The importance of channel intersections in the catalytic performance of high silica stilbite
skos:prefLabel
The importance of channel intersections in the catalytic performance of high silica stilbite The importance of channel intersections in the catalytic performance of high silica stilbite
skos:notation
RIV/61388955:_____/13:00387274!RIV14-GA0-61388955
n11:predkladatel
n12:ico%3A61388955
n3:aktivita
n13:P n13:I
n3:aktivity
I, P(GBP106/12/G015)
n3:cisloPeriodika
FEB 2013
n3:dodaniDat
n4:2014
n3:domaciTvurceVysledku
n5:7016662 n5:4492803 n5:6503284
n3:druhVysledku
n15:J
n3:duvernostUdaju
n17:S
n3:entitaPredkladatele
n19:predkladatel
n3:idSjednocenehoVysledku
79227
n3:idVysledku
RIV/61388955:_____/13:00387274
n3:jazykVysledku
n10:eng
n3:klicovaSlova
SSZ-75 (STI); Acidity; Channel intersections
n3:klicoveSlovo
n7:SSZ-75%20%28STI%29 n7:Channel%20intersections n7:Acidity
n3:kodStatuVydavatele
US - Spojené státy americké
n3:kontrolniKodProRIV
[8853E2A16D5E]
n3:nazevZdroje
Journal of Catalysis
n3:obor
n6:CF
n3:pocetDomacichTvurcuVysledku
3
n3:pocetTvurcuVysledku
5
n3:projekt
n16:GBP106%2F12%2FG015
n3:rokUplatneniVysledku
n4:2013
n3:svazekPeriodika
298
n3:tvurceVysledku
Davis, T. M. Vitvarová, Dana Chen, C.-Y. Žilková, Naděžda Čejka, Jiří
n3:wos
000316155700010
s:issn
0021-9517
s:numberOfPages
10
n9:doi
10.1016/j.jcat.2012.10.022