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Characterization of the Surface Acidity of MFI Zeolite Nanosheets by 31P NMR of Adsorbed Phosphine Oxides and Catalytic Cracking of Decalin

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Title
Characterization of the Surface Acidity of MFI Zeolite Nanosheets by 31P NMR of Adsorbed Phosphine Oxides and Catalytic Cracking of Decalin
Author(s)
Yongbeom Seo; Kanghee Cho; Younjae Jung; Ryong Ryoo
Publication Date
2013-04
Journal
ACS CATALYSIS, v.3, no.4, pp.713 - 720
Publisher
AMER CHEMICAL SOC
Abstract
MFI zeolite nanosheets tailored to 2.5-nm thickness were synthesized using a surfactant-type zeolite structure-directing agent, [C22H45−N+(CH3)2−C6H12−N+(CH3)2−C6H13](Br−)2. The zeolite nanosheets possessed Brønsted acid sites on their external surfaces as well as in the internal micropore walls. The acid strength and concentration was characterized by the 31P NMR signals of the adsorbed trimethylphosphine oxide and tributylphosphine oxide. The 31P NMR investigation identified three types of Brønsted acid sites with different strengths on external surfaces; there were four types inside the micropores. A linear correlation has been established between the number of the external strongest acid sites and the catalytic activity in decalin cracking for the MFI zeolite catalysts investigated in this work.
URI
https://pr.ibs.re.kr/handle/8788114/1598
ISSN
2155-5435
Appears in Collections:
Center for Nanomaterials and Chemical Reactions(나노물질 및 화학반응 연구단) > Journal Papers (저널논문)
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