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Statements

Subject Item
n2:RIV%2F61388955%3A_____%2F13%3A00422341%21RIV14-GA0-61388955
rdf:type
n9:Vysledek skos:Concept
dcterms:description
The effect of MFI zeolite nanosheet morphology and related mesostructures on the accessibility of acid sites evaluated from FTIR spectra of different adsorbed probe molecules and conversions and selectivities in toluene disproportionation and alkylation with isopropyl alcohol was investigated. Two-dimensional MFI lamellar zeolite (1.5 nm thickness of layers) and related mesoporous sponge morphologies, most probably with 10-ring channel system not yet structurally fully determined, were synthesized and characterized by XRD, SEM, TEM, and adsorption measurements. FTIR spectroscopy using pyridine, deuterated acetonitrile and 2,6-di-tert-butyl pyridine evidenced high concentrations of accessible Lewis acid sites at the expense of Brønsted acid sites. Ordered mesoporous zeolites exhibited slightly higher toluene conversion in its alkylation with isopropyl alcohol than lamellar MFI or conventional MFI due to easy access to active sites. The lamellar zeolite consisting of less than a unit cell layer was slightly more active than MFI but still exhibited high selectivity to p-cymene. It evidences that alkylation of toluene with isopropyl alcohol proceeds mainly in the 10-ring channel system of MFI zeolite, although the effect of large external surface cannot be neglected. Increased para-selectivity compared with thermodynamic value is achieved even in the case of extremely thin zeolite nanosheets. The effect of MFI zeolite nanosheet morphology and related mesostructures on the accessibility of acid sites evaluated from FTIR spectra of different adsorbed probe molecules and conversions and selectivities in toluene disproportionation and alkylation with isopropyl alcohol was investigated. Two-dimensional MFI lamellar zeolite (1.5 nm thickness of layers) and related mesoporous sponge morphologies, most probably with 10-ring channel system not yet structurally fully determined, were synthesized and characterized by XRD, SEM, TEM, and adsorption measurements. FTIR spectroscopy using pyridine, deuterated acetonitrile and 2,6-di-tert-butyl pyridine evidenced high concentrations of accessible Lewis acid sites at the expense of Brønsted acid sites. Ordered mesoporous zeolites exhibited slightly higher toluene conversion in its alkylation with isopropyl alcohol than lamellar MFI or conventional MFI due to easy access to active sites. The lamellar zeolite consisting of less than a unit cell layer was slightly more active than MFI but still exhibited high selectivity to p-cymene. It evidences that alkylation of toluene with isopropyl alcohol proceeds mainly in the 10-ring channel system of MFI zeolite, although the effect of large external surface cannot be neglected. Increased para-selectivity compared with thermodynamic value is achieved even in the case of extremely thin zeolite nanosheets.
dcterms:title
The effect of MFI zeolite lamellar and related mesostructures on toluene disproportionation and alkylation The effect of MFI zeolite lamellar and related mesostructures on toluene disproportionation and alkylation
skos:prefLabel
The effect of MFI zeolite lamellar and related mesostructures on toluene disproportionation and alkylation The effect of MFI zeolite lamellar and related mesostructures on toluene disproportionation and alkylation
skos:notation
RIV/61388955:_____/13:00422341!RIV14-GA0-61388955
n9:predkladatel
n17:ico%3A61388955
n3:aktivita
n4:P n4:I
n3:aktivity
I, P(GAP106/12/0189)
n3:cisloPeriodika
8
n3:dodaniDat
n11:2014
n3:domaciTvurceVysledku
n13:7016662 n13:6503284 n13:4492803
n3:druhVysledku
n7:J
n3:duvernostUdaju
n10:S
n3:entitaPredkladatele
n18:predkladatel
n3:idSjednocenehoVysledku
71609
n3:idVysledku
RIV/61388955:_____/13:00422341
n3:jazykVysledku
n19:eng
n3:klicovaSlova
Adsorption measurement; Alkylation of toluene; Isopropyl alcohols
n3:klicoveSlovo
n5:Adsorption%20measurement n5:Isopropyl%20alcohols n5:Alkylation%20of%20toluene
n3:kodStatuVydavatele
GB - Spojené království Velké Británie a Severního Irska
n3:kontrolniKodProRIV
[C515781FEB0C]
n3:nazevZdroje
Catalysis Science &Technology
n3:obor
n6:CF
n3:pocetDomacichTvurcuVysledku
3
n3:pocetTvurcuVysledku
5
n3:projekt
n16:GAP106%2F12%2F0189
n3:rokUplatneniVysledku
n11:2013
n3:svazekPeriodika
3
n3:tvurceVysledku
Ryoo, R. Jo, Ch. Žilková, Naděžda Čejka, Jiří Vitvarová, Dana
n3:wos
000321571500031
s:issn
2044-4753
s:numberOfPages
11
n12:doi
10.1039/c3cy00146f