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| Description
| - Two novel zeolites SSZ-33 and SSZ-35 were investigated with respect to their acidic properties using different probe molecules to characterize the accessibility and acid strength of Lewis and Bronsted acid sites. Ammonia, pyridine, pivalonitrile, and acetonitrile-d(3) were used as probe molecules, and the results were correlated with Al-27 and H-1 magic angle spinning NMR. Both SSZ-33 and SSZ-35 zeolites were found to possess bridging Si-OH-Al groups of virtually uniform and high acid strength. For both SSZ-33 and SSZ-35, there is the typical presence of highly disturbed OH groups (IR band around 3500 cm-1), which amounts to almost half of the overall Bronsted acidity. It was found that almost all bridging Si-OH-Al groups in SSZ-33 are located in the 12-MR rings. Both acetonitrile-d(3) and pyridine sorptions suggest the presence of two types of Lewis sites in SSZ-35, differing in acid strength and electron-acceptor properties, whereas in the SSZ-33 zeolite only one type is present.
- Two novel zeolites SSZ-33 and SSZ-35 were investigated with respect to their acidic properties using different probe molecules to characterize the accessibility and acid strength of Lewis and Bronsted acid sites. Ammonia, pyridine, pivalonitrile, and acetonitrile-d(3) were used as probe molecules, and the results were correlated with Al-27 and H-1 magic angle spinning NMR. Both SSZ-33 and SSZ-35 zeolites were found to possess bridging Si-OH-Al groups of virtually uniform and high acid strength. For both SSZ-33 and SSZ-35, there is the typical presence of highly disturbed OH groups (IR band around 3500 cm-1), which amounts to almost half of the overall Bronsted acidity. It was found that almost all bridging Si-OH-Al groups in SSZ-33 are located in the 12-MR rings. Both acetonitrile-d(3) and pyridine sorptions suggest the presence of two types of Lewis sites in SSZ-35, differing in acid strength and electron-acceptor properties, whereas in the SSZ-33 zeolite only one type is present. (en)
- Dva nové typy zeolitů SSZ-33 a SSZ-35 byly zkoumány především z pohledu detailního popisu jejich kyselých vlastností. Požití různých testovacích molekul umožnilo charakterizovat přístupnost a sílu kyselosti Lewisových a Broenstedových kyselých center přítomných v těchto zeolitech. Jako testovací molekuly byly požity amoniak, pyridin, CO, pivalonitril a d3-acetonitril. Výsledky infračervené spektroskopie byly porovnány s výsledky 27Al a 1H MAS NMR. U obou typů zkoumaných zeolitů SSZ-33 i SSZ-35 byly zjištěny můstkové Si-OH-Al skupiny s vysokou sílou kyselosti. U zeolitu SSZ-33 bylo zjištěno, že téměř všechny můstkové Si-OH-Al skupiny se nacházejí ve 12-ti četných oknech. Jak sorpce d3-acetonitril tak i pyridinu prokázala dva typy Lewisových center u zeolitu SSZ-35 lišících se sílou kyselosti i elektron-akceptorovými vlastnostmi, zatímco v případě zeolitu SSZ-33 byl zjištěn pouze jeden typ Lewisových center. (cs)
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| Title
| - Acidic properties of SSZ-33 and SSZ-35 novel zeolites: a complex infrared and MAS NMR study
- Acidic properties of SSZ-33 and SSZ-35 novel zeolites: a complex infrared and MAS NMR study (en)
- Kyselé vlastnosti nových zeolitů SSZ-33 a SSZ 35: komplexní infračervená a MAS NMR studie (cs)
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| skos:prefLabel
| - Acidic properties of SSZ-33 and SSZ-35 novel zeolites: a complex infrared and MAS NMR study
- Acidic properties of SSZ-33 and SSZ-35 novel zeolites: a complex infrared and MAS NMR study (en)
- Kyselé vlastnosti nových zeolitů SSZ-33 a SSZ 35: komplexní infračervená a MAS NMR studie (cs)
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| skos:notation
| - RIV/61388955:_____/08:00309856!RIV09-AV0-61388955
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| http://linked.open...avai/riv/aktivita
| |
| http://linked.open...avai/riv/aktivity
| - P(1QS400400560), P(GA104/07/0383), Z(AV0Z40400503)
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| http://linked.open...iv/cisloPeriodika
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| http://linked.open...vai/riv/dodaniDat
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| http://linked.open...aciTvurceVysledku
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| http://linked.open.../riv/druhVysledku
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| http://linked.open...iv/duvernostUdaju
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| http://linked.open...titaPredkladatele
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| http://linked.open...dnocenehoVysledku
| |
| http://linked.open...ai/riv/idVysledku
| - RIV/61388955:_____/08:00309856
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| http://linked.open...riv/jazykVysledku
| |
| http://linked.open.../riv/klicovaSlova
| - nuclear magnetic resonance; adsorbed probe molecules; angle-spinning NMR (en)
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| http://linked.open.../riv/klicoveSlovo
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| http://linked.open...odStatuVydavatele
| - US - Spojené státy americké
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| http://linked.open...ontrolniKodProRIV
| |
| http://linked.open...i/riv/nazevZdroje
| - Journal of Physical Chemistry C
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| http://linked.open...in/vavai/riv/obor
| |
| http://linked.open...ichTvurcuVysledku
| |
| http://linked.open...cetTvurcuVysledku
| |
| http://linked.open...vavai/riv/projekt
| |
| http://linked.open...UplatneniVysledku
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| http://linked.open...v/svazekPeriodika
| |
| http://linked.open...iv/tvurceVysledku
| - Čejka, Jiří
- Zones, S. I.
- Gil, B.
- Bejblová, Martina
- Hwang, S.-J.
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| http://linked.open...n/vavai/riv/zamer
| |
| issn
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| number of pages
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| is http://linked.open...avai/riv/vysledek
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