. . "Acidic properties of SSZ-33 and SSZ-35 novel zeolites: a complex infrared and MAS NMR study" . "Kysel\u00E9 vlastnosti nov\u00FDch zeolit\u016F SSZ-33 a SSZ 35: komplexn\u00ED infra\u010Derven\u00E1 a MAS NMR studie"@cs . . "nuclear magnetic resonance; adsorbed probe molecules; angle-spinning NMR"@en . "Dva nov\u00E9 typy zeolit\u016F SSZ-33 a SSZ-35 byly zkoum\u00E1ny p\u0159edev\u0161\u00EDm z pohledu detailn\u00EDho popisu jejich kysel\u00FDch vlastnost\u00ED. Po\u017Eit\u00ED r\u016Fzn\u00FDch testovac\u00EDch molekul umo\u017Enilo charakterizovat p\u0159\u00EDstupnost a s\u00EDlu kyselosti Lewisov\u00FDch a Broenstedov\u00FDch kysel\u00FDch center p\u0159\u00EDtomn\u00FDch v t\u011Bchto zeolitech. Jako testovac\u00ED molekuly byly po\u017Eity amoniak, pyridin, CO, pivalonitril a d3-acetonitril. V\u00FDsledky infra\u010Derven\u00E9 spektroskopie byly porovn\u00E1ny s v\u00FDsledky 27Al a 1H MAS NMR. U obou typ\u016F zkouman\u00FDch zeolit\u016F SSZ-33 i SSZ-35 byly zji\u0161t\u011Bny m\u016Fstkov\u00E9 Si-OH-Al skupiny s vysokou s\u00EDlou kyselosti. U zeolitu SSZ-33 bylo zji\u0161t\u011Bno, \u017Ee t\u00E9m\u011B\u0159 v\u0161echny m\u016Fstkov\u00E9 Si-OH-Al skupiny se nach\u00E1zej\u00ED ve 12-ti \u010Detn\u00FDch oknech. Jak sorpce d3-acetonitril tak i pyridinu prok\u00E1zala dva typy Lewisov\u00FDch center u zeolitu SSZ-35 li\u0161\u00EDc\u00EDch se s\u00EDlou kyselosti i elektron-akceptorov\u00FDmi vlastnostmi, zat\u00EDmco v p\u0159\u00EDpad\u011B zeolitu SSZ-33 byl zji\u0161t\u011Bn pouze jeden typ Lewisov\u00FDch center."@cs . "[735799351F98]" . "P(1QS400400560), P(GA104/07/0383), Z(AV0Z40400503)" . "Journal of Physical Chemistry C" . . . "11"^^ . "US - Spojen\u00E9 st\u00E1ty americk\u00E9" . "112" . . "Gil, B." . . "Kysel\u00E9 vlastnosti nov\u00FDch zeolit\u016F SSZ-33 a SSZ 35: komplexn\u00ED infra\u010Derven\u00E1 a MAS NMR studie"@cs . . "\u010Cejka, Ji\u0159\u00ED" . "1932-7447" . . . "5"^^ . . . "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 . . "Bejblov\u00E1, Martina" . "Acidic properties of SSZ-33 and SSZ-35 novel zeolites: a complex infrared and MAS NMR study"@en . "RIV/61388955:_____/08:00309856!RIV09-AV0-61388955" . "Zones, S. I." . "Acidic properties of SSZ-33 and SSZ-35 novel zeolites: a complex infrared and MAS NMR study" . . "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." . . "354759" . "Acidic properties of SSZ-33 and SSZ-35 novel zeolites: a complex infrared and MAS NMR study"@en . "8" . . "2"^^ . . . "Hwang, S.-J." . . "RIV/61388955:_____/08:00309856" .