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Statements

Subject Item
n2:RIV%2F61388955%3A_____%2F04%3A00000309%21RIV%2F2005%2FAV0%2FA54005%2FN
rdf:type
n13:Vysledek skos:Concept
dcterms:description
The effect of the structure of large pore zeolites of Mordenite, beta, L and Y types on the activity, selectivity to xylenes and time-on-stream stability was investigated in trimethyl benzene disproportionation. Significant differences in conversion and time-on-stream stability were observed among individual zeolites. Zeolite beta and zeolite Y were found to exhibit the highest stability in conversion of trimethyl benzenes, while zeolite L and Mordenite were deactivated much faster. The optimum reaction conditions to achieve a high and stable conversion with sufficient selectivity to xylenes were at the reaction temperature of 400 degreesC with WHSV = 5-20 h(-1). Diffusion coefficients of trimethyl and tetramethyl benzenes over zeolites Y, beta and Mordenite at 25 degreesC were determined. Due to the significant differences in diffusion of individual trimethyl and tetramethyl benzenes, it is expected that diffusion of these molecules substantially influence the rate of this reaction. The effect of the structure of large pore zeolites of Mordenite, beta, L and Y types on the activity, selectivity to xylenes and time-on-stream stability was investigated in trimethyl benzene disproportionation. Significant differences in conversion and time-on-stream stability were observed among individual zeolites. Zeolite beta and zeolite Y were found to exhibit the highest stability in conversion of trimethyl benzenes, while zeolite L and Mordenite were deactivated much faster. The optimum reaction conditions to achieve a high and stable conversion with sufficient selectivity to xylenes were at the reaction temperature of 400 degreesC with WHSV = 5-20 h(-1). Diffusion coefficients of trimethyl and tetramethyl benzenes over zeolites Y, beta and Mordenite at 25 degreesC were determined. Due to the significant differences in diffusion of individual trimethyl and tetramethyl benzenes, it is expected that diffusion of these molecules substantially influence the rate of this reaction. Byl studován vliv struktury širokoporézních zeolitů Y, Beta, L and mordenitu na aktivitu, selektivitu na xyleny a časovou stabilitu při disproporcionaci trimethylbenzenů. Mezi jednotlivými zeolity byly shledány zásadní rozdíly. Nejvyšší aktivitu a časovou stálost vykazovaly zeolity Y a Beta zatímco mordenit a zeolit L se velmi snadno deaktivovaly. Nejvyšší stabilita konverze při rozumné selektivitě na xyleny byla dosažena při 400 oC a WHSV = 5-20 h-1. Na studovaných zeolitech byly změřeny též difuzní koeficienty trimethylbenzenů a tetramethylbenzenů, které potvrdily rozdílnou rychlost transportu reaktantů a produktů. Navíc tyto experimenty prokázaly rozdílnou dostupnost katalyticky aktivních center v kanálech jednotlivých zeolitů
dcterms:title
Disproportionation of Trimethyl Benzenes over Large Pore Zeolites: Catalytic and Adsorption Study Disproporcionace trimethyl benzenů na širokoporézníích zeolitech: katalytická a adsorpční studie Disproportionation of Trimethyl Benzenes over Large Pore Zeolites: Catalytic and Adsorption Study
skos:prefLabel
Disproportionation of Trimethyl Benzenes over Large Pore Zeolites: Catalytic and Adsorption Study Disproporcionace trimethyl benzenů na širokoporézníích zeolitech: katalytická a adsorpční studie Disproportionation of Trimethyl Benzenes over Large Pore Zeolites: Catalytic and Adsorption Study
skos:notation
RIV/61388955:_____/04:00000309!RIV/2005/AV0/A54005/N
n3:strany
191;199
n3:aktivita
n12:P n12:Z
n3:aktivity
P(GA104/99/0840), P(IBS4040015), Z(AV0Z4040901)
n3:cisloPeriodika
1/2
n3:dodaniDat
n14:2005
n3:domaciTvurceVysledku
n6:7016662 n6:6309585 n6:1053116
n3:druhVysledku
n9:J
n3:duvernostUdaju
n15:S
n3:entitaPredkladatele
n16:predkladatel
n3:idSjednocenehoVysledku
560789
n3:idVysledku
RIV/61388955:_____/04:00000309
n3:jazykVysledku
n4:eng
n3:klicovaSlova
trimethyl benzenes; xylenes; tetramethyl benzenes; disproportionation
n3:klicoveSlovo
n10:xylenes n10:tetramethyl%20benzenes n10:disproportionation n10:trimethyl%20benzenes
n3:kodStatuVydavatele
NL - Nizozemsko
n3:kontrolniKodProRIV
[7BD3B85067B2]
n3:nazevZdroje
Applied Catalysis
n3:obor
n18:CF
n3:pocetDomacichTvurcuVysledku
3
n3:pocetTvurcuVysledku
3
n3:projekt
n5:IBS4040015 n5:GA104%2F99%2F0840
n3:rokUplatneniVysledku
n14:2004
n3:svazekPeriodika
277
n3:tvurceVysledku
Kotrla, Josef Čejka, Jiří Krejčí, Andrea
n3:zamer
n17:AV0Z4040901
s:issn
0926-860X
s:numberOfPages
9