"Acidic properties of SSZ-33 and SSZ-35 novel zeolites: a complex infrared and MAS NMR study" . . . "6"^^ . "\u010Cejka, Ji\u0159\u00ED" . . "Vol\u00E1kov\u00E1, Martina" . . . "Oxford" . . "P(1QS400400560), P(GA104/07/0383), Z(AV0Z40400503)" . "RIV/61388955:_____/08:00315585" . . . "Gil, B." . "3"^^ . "[A15315050FE0]" . . "Elsevier" . "Acidic properties of SSZ-33 and SSZ-35 novel zeolites: a complex infrared and MAS NMR study"@en . "Acidic properties of SSZ-33 and SSZ-35 novel zeolites: a complex infrared and MAS NMR study"@en . . . "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 . "SSZ-33; SSZ-35; zeolites; acidity"@en . "Paris" . . . "Zeolites and Related Materials: Trends, Targets and Challenges" . . "978-0-444-53297-8" . "\u017Dilkov\u00E1, Nad\u011B\u017Eda" . . "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." . "6"^^ . . . . "Acidic properties of SSZ-33 and SSZ-35 novel zeolites: a complex infrared and MAS NMR study" . . "2008-09-01+02:00"^^ . "354757" . "RIV/61388955:_____/08:00315585!RIV10-AV0-61388955" . "Zones, S. I." . . "Hwang, S.-J." . . .