Proton MAS NMR measurement of acidic protons over zeolites at high temperature

2014 Fiscal Year Final Research Report

• Project/Area Number: 25630364
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Catalyst/Resource chemical process
• Research Institution: Tokyo Institute of Technology
• Principal Investigator: TOSHIHIDE Baba 東京工業大学, 総合理工学研究科(研究院), 教授 (50165057)
• Project Period (FY): 2013-04-01 – 2015-03-31
• Keywords: ゼオライト / 温度可変1H MAS NMR / ケミカルシフト / 酸強度

Outline of Final Research Achievements

1H MAS NMR spectra of proton-exchanged zeolites were measured at high temperature up to 673 K. The proton chemical shift due to the hydroxyl groups over proton-exchanged zeolite depended on the temperature; the chemical shift inceased with inceasing the temperature up to 623 K, and was almost constant when the temperature was higher than 623 K. The difference in the chemical shift due to the change in temperature depended on the zeolite. The hydroxyl group with the stronger acid strength showed the larger chemical shift and larger change in chemical shift due to the change in temperature.

Free Research Field

触媒化学