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Statements

Subject Item
n2:RIV%2F61388955%3A_____%2F09%3A00327364%21RIV10-AV0-61388955
rdf:type
n9:Vysledek skos:Concept
dcterms:description
Modification of HMCM-22 zeolite by alkaline treatment was investigated by various characterization techniques and in toluene disproportionation and alkylation with isopropyl alcohol. This 'desilication' process led for mild alkaline concentrations (similar to 0.10-0.20 M NaOH at 323 K for 45 min) to the partial destruction of the zeolite framework, but also to the formation of additional mesoporosity. Furthermore, the accessibility/availability of Lewis acid sites, investigated by d (3)-acetonitrile and pyridine adsorption using FTIR spectroscopy, increased for these mild alkaline treatments, while the Bronsted acidity decreased. Higher alkaline concentrations (up to 0.50 M NaOH) led to a too severe framework and pore destruction and a decrease of both the Lewis and Bronsted acid site concentration. Modification of HMCM-22 zeolite by alkaline treatment was investigated by various characterization techniques and in toluene disproportionation and alkylation with isopropyl alcohol. This 'desilication' process led for mild alkaline concentrations (similar to 0.10-0.20 M NaOH at 323 K for 45 min) to the partial destruction of the zeolite framework, but also to the formation of additional mesoporosity. Furthermore, the accessibility/availability of Lewis acid sites, investigated by d (3)-acetonitrile and pyridine adsorption using FTIR spectroscopy, increased for these mild alkaline treatments, while the Bronsted acidity decreased. Higher alkaline concentrations (up to 0.50 M NaOH) led to a too severe framework and pore destruction and a decrease of both the Lewis and Bronsted acid site concentration.
dcterms:title
Alkaline Modification of MCM-22 to a 3D Interconnected Pore System and its Application in Toluene Disproportionation and Alkylation Alkaline Modification of MCM-22 to a 3D Interconnected Pore System and its Application in Toluene Disproportionation and Alkylation
skos:prefLabel
Alkaline Modification of MCM-22 to a 3D Interconnected Pore System and its Application in Toluene Disproportionation and Alkylation Alkaline Modification of MCM-22 to a 3D Interconnected Pore System and its Application in Toluene Disproportionation and Alkylation
skos:notation
RIV/61388955:_____/09:00327364!RIV10-AV0-61388955
n3:aktivita
n8:Z n8:P
n3:aktivity
P(GA203/08/0604), Z(AV0Z40400503)
n3:cisloPeriodika
9
n3:dodaniDat
n16:2010
n3:domaciTvurceVysledku
n6:6503284 n6:7016662 Pawlesa, Justyna
n3:druhVysledku
n11:J
n3:duvernostUdaju
n7:S
n3:entitaPredkladatele
n14:predkladatel
n3:idSjednocenehoVysledku
302486
n3:idVysledku
RIV/61388955:_____/09:00327364
n3:jazykVysledku
n17:eng
n3:klicovaSlova
desilication; mosepores; MWW; 29Si MAS-NMR
n3:klicoveSlovo
n4:29Si%20MAS-NMR n4:MWW n4:desilication n4:mosepores
n3:kodStatuVydavatele
NL - Nizozemsko
n3:kontrolniKodProRIV
[FFD31274ACE2]
n3:nazevZdroje
Topics in Catalysis
n3:obor
n18:CF
n3:pocetDomacichTvurcuVysledku
3
n3:pocetTvurcuVysledku
6
n3:projekt
n15:GA203%2F08%2F0604
n3:rokUplatneniVysledku
n16:2009
n3:svazekPeriodika
52
n3:tvurceVysledku
van Miltenburg, A. Stöcker, M. Žilková, Naděžda Bouzga, A. M. Pawlesa, Justyna Čejka, Jiří
n3:wos
000267593900007
n3:zamer
n10:AV0Z40400503
s:issn
1022-5528
s:numberOfPages
13