About: Is 1-hexene epoxidation in TS-1 diffusion limited in different solvents?

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Description	PFG NMR diffusion measurements were carried out to determine the effect of solvent on intracrystalline reactant diffusivities and on 1-hexene epoxidation rates in TS-1 catalyst. Using n-hexane in silicalite as a mimic for the TS-1 system, the self-diffusivity of n-hexane in silicalite was found to be 24% higher in methanol solvent than in acetonitrile solvent and 45% higher than in acetone solvent. The presence of trace Al did not affect n-hexane diffusivity. Based on analysis of the Weisz modulus for a slab morphology, the 1-hexene epoxidation reaction in TS-1 was found to be diffusion limited only if the crystal size is at least 38 .mu.m in the methanol system. PFG NMR diffusion measurements were carried out to determine the effect of solvent on intracrystalline reactant diffusivities and on 1-hexene epoxidation rates in TS-1 catalyst. Using n-hexane in silicalite as a mimic for the TS-1 system, the self-diffusivity of n-hexane in silicalite was found to be 24% higher in methanol solvent than in acetonitrile solvent and 45% higher than in acetone solvent. The presence of trace Al did not affect n-hexane diffusivity. Based on analysis of the Weisz modulus for a slab morphology, the 1-hexene epoxidation reaction in TS-1 was found to be diffusion limited only if the crystal size is at least 38 .mu.m in the methanol system. (en) Byla prováděna difuzní měření pomocí PFG NMR techniky s cílem určit vliv rozpouštědla na intrakrystalické difusivity reaktantu a na rychlosti epoxidace 1-hexenu. Použití n-hexanu v silikalitu, který napodobuje TS-1 systém, bylo zjištěno, že je samodifusivita n-hexanu v silikalitu o 24% vyšší v metanolu než v acetonitrilu a o 45% vyšší než v acetonu. Přítomnost stop Al neovlivnila difusivitu n-hexanu. Pomocí analýzy Weiszova modulu pro destičkovou morfologii krystalu bylo zjištěno, že epoxidační reakce 1-hexenu v TS-1 je limitována difuzí pro reakci provedenou v metanolu pouze je-li velikost krystalu minimálně 38 .mu.m. (cs)
Title	Is 1-hexene epoxidation in TS-1 diffusion limited in different solvents? Is 1-hexene epoxidation in TS-1 diffusion limited in different solvents? (en) Je epoxidace 1-hexenu v TS-1 difúzi limitována různými rozpouštědly? (cs)
skos:prefLabel	Is 1-hexene epoxidation in TS-1 diffusion limited in different solvents? Is 1-hexene epoxidation in TS-1 diffusion limited in different solvents? (en) Je epoxidace 1-hexenu v TS-1 difúzi limitována různými rozpouštědly? (cs)
skos:notation	RIV/61388955:_____/06:00076162!RIV07-AV0-61388955
http://linked.open.../vavai/riv/strany	936;940
http://linked.open...avai/riv/aktivita	Z
http://linked.open...avai/riv/aktivity	Z(AV0Z40400503)
http://linked.open...iv/cisloPeriodika	12
http://linked.open...vai/riv/dodaniDat	2007
http://linked.open...aciTvurceVysledku	Kočiřík, Milan Zikánová, Arlette
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Ústav fyzikální chemie J. Heyrovského AV ČR, v.v.i.
http://linked.open...dnocenehoVysledku	480480
http://linked.open...ai/riv/idVysledku	RIV/61388955:_____/06:00076162
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	PFG NMR; n-hexane diffusivity; 1-hexene epoxidation in TS-1; silicalite (en)
http://linked.open.../riv/klicoveSlovo	PFG NMR silicalite 1-hexene epoxidation in TS-1 n-hexane diffusivity
http://linked.open...odStatuVydavatele	NL - Nizozemsko
http://linked.open...ontrolniKodProRIV	[D253F10CBB5C]
http://linked.open...i/riv/nazevZdroje	Catalysis Commununication
http://linked.open...in/vavai/riv/obor	CF
http://linked.open...ichTvurcuVysledku	2 (xsd:int)
http://linked.open...cetTvurcuVysledku	6 (xsd:int)
http://linked.open...UplatneniVysledku	2006
http://linked.open...v/svazekPeriodika	7
http://linked.open...iv/tvurceVysledku	Kočiřík, Milan Zikánová, Arlette Zhao, Q. Broadbelt, L. J. Ramachandran, Ch. E. Snurr, R. Q.
http://linked.open...n/vavai/riv/zamer	Struktura, reaktivita a dynamika molekulárních a biomolekulárních systémů: teorie, experiment, aplikace
issn	1566-7367
number of pages	5 (xsd:int)
is http://linked.open...avai/riv/vysledek of	Is 1-hexene epoxidation in TS-1 diffusion limited in different solvents? Is 1-hexene epoxidation in TS-1 diffusion limited in different solvents?

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