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Description
| - The cracking of 2-methyl-2-butene was canied out as a model reaction Of C-4(+) olefins cracking by using of various zeolite and zeotype catalysts to obtain light olefins, such as ethylene and propylene. Only ZSM-5 and ZSM-11 zeolites with 10-MRP with intersecting channels and acid sites concentration ranging between 0.03 and 0.1 mmol/g exhibit high and stable selectivity to C-2-C-4 olefins at high conversion level. Active and selective catalysts were prepared by three different methods: direct synthesis of H-ZSM-5 with high Si/Al ratio, steaming of HZSM-5 and %22partial%22 ammonium ion exchange of Na-ZSM-5. Neither H-(AI)ZSM-5 with high concentration of acid sites nor H-(Fe)ZSM-5 are suitable catalysts as they catalyze hydrogen-transfer reactions yielding paraffins and aromatics, showing the importance of low concentration and high strength of acid sites for cracking activity-selectivity.
- The cracking of 2-methyl-2-butene was canied out as a model reaction Of C-4(+) olefins cracking by using of various zeolite and zeotype catalysts to obtain light olefins, such as ethylene and propylene. Only ZSM-5 and ZSM-11 zeolites with 10-MRP with intersecting channels and acid sites concentration ranging between 0.03 and 0.1 mmol/g exhibit high and stable selectivity to C-2-C-4 olefins at high conversion level. Active and selective catalysts were prepared by three different methods: direct synthesis of H-ZSM-5 with high Si/Al ratio, steaming of HZSM-5 and %22partial%22 ammonium ion exchange of Na-ZSM-5. Neither H-(AI)ZSM-5 with high concentration of acid sites nor H-(Fe)ZSM-5 are suitable catalysts as they catalyze hydrogen-transfer reactions yielding paraffins and aromatics, showing the importance of low concentration and high strength of acid sites for cracking activity-selectivity. (en)
- Bylo studováno krakování 2-metyl-2-butenu jako modelová reakce krakování C4+ olefinů s použitím různých zeolitů a zetypů za účelem získat lehké olefiny zejména ethylen a propylen. Jen zeolity ZSM-5 a ZSM-11 s protínajícími se 10-MRP a koncentrací kyselých center v rozsahu 0,03 – 0,1 mmol.g-1 vykazují vysokou a stabilní selektivitu na C2-C4 olefiny a vysokou úroveň konverze. Aktivní a selektivní katalyzátor byl připraven pomocí tří metod: přímá syntéza H-ZSM-5 s vysokým poměrem Si/Al, opracováním H-ZSM-5 nebo částečnou iontovou výměnou Na-ZSM-5 NH4+ ionty. H-(Al)ZSM-5 s vysokou koncentrací kyselých center a H-(Fe)ZSM-5 katalyzují reakce s přenosem vodíku poskytující parafíny a aromáty a nejsou tak vhodnými katalyzátory. Toto ukazuje důležitost malé koncentrace a silné kyselosti aktivních center. Vysoký výtěžek butenů v produktech indikuje, že penteny jsou krakovány v 10-MRP za vzniku objemného intermediátu karbéniového iontu vyžadujícího dostatečný prostor v kanálu zeolitu. (cs)
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Title
| - Cracking of pentenes to C2-C4 light olefins over zeolites and zeotypes - Role of topology and acid site strength and concentration
- Krakování pentenů na C2-C4 lehké olefiny na zeolitech a zeotypech. Role topologie a síly kyselosti a koncentrace kyselých center (cs)
- Cracking of pentenes to C2-C4 light olefins over zeolites and zeotypes - Role of topology and acid site strength and concentration (en)
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skos:prefLabel
| - Cracking of pentenes to C2-C4 light olefins over zeolites and zeotypes - Role of topology and acid site strength and concentration
- Krakování pentenů na C2-C4 lehké olefiny na zeolitech a zeotypech. Role topologie a síly kyselosti a koncentrace kyselých center (cs)
- Cracking of pentenes to C2-C4 light olefins over zeolites and zeotypes - Role of topology and acid site strength and concentration (en)
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skos:notation
| - RIV/61388955:_____/05:00028541!RIV06-AV0-61388955
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http://linked.open.../vavai/riv/strany
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http://linked.open...avai/riv/aktivita
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http://linked.open...avai/riv/aktivity
| - P(IBS4040015), 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
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http://linked.open...ai/riv/idVysledku
| - RIV/61388955:_____/05:00028541
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http://linked.open...riv/jazykVysledku
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http://linked.open.../riv/klicovaSlova
| - pentene cracking; zeolite topology; acid site concentration; ZSM-5 (en)
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http://linked.open.../riv/klicoveSlovo
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http://linked.open...odStatuVydavatele
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http://linked.open...ontrolniKodProRIV
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http://linked.open...i/riv/nazevZdroje
| - Applied Catalysis A - General
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http://linked.open...in/vavai/riv/obor
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http://linked.open...ichTvurcuVysledku
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http://linked.open...cetTvurcuVysledku
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http://linked.open...vavai/riv/projekt
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http://linked.open...UplatneniVysledku
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http://linked.open...v/svazekPeriodika
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http://linked.open...iv/tvurceVysledku
| - Bortnovsky, Oleg
- Sazama, Petr
- Wichterlová, Blanka
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http://linked.open...n/vavai/riv/zamer
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issn
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number of pages
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is http://linked.open...avai/riv/vysledek
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