2016年5月
Relationship between the Catalytic Activities of Acidic Protons in Aluminosilicate and Silicoaluminophosphate Molecular Sieves for n-Butane Cracking and Their H-1 Chemical Shifts Measured at the Reaction Temperature
JOURNAL OF PHYSICAL CHEMISTRY C
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- 巻
- 120
- 号
- 17
- 開始ページ
- 9207
- 終了ページ
- 9217
- 記述言語
- 英語
- 掲載種別
- DOI
- 10.1021/acs.jpcc.6b00629
- 出版者・発行元
- AMER CHEMICAL SOC
Zeolite materials are used as solid acid catalysts in petrochemical reactions, which typically occur at Bronsted acid sites located at bridging hydroxyl groups (Si-OH-Al). These sites have been investigated spectroscopically, albeit at room temperature; a proper understanding requires that such data be acquired at actual reaction temperatures. The influence of temperature on the H-1 chemical shifts and dynamic properties of Si-OH-Al sites in proton-type aluminosilicate and silicoaluminophosphate molecular sieves was examined by variable-temperature H-1 magic-angle spinning nuclear magnetic resonance spectroscopy, from 298 to 673 K. The chemical shifts and line widths of the peaks due to Si-OH-Al protons were strongly dependent on the temperature, whereas those due to P-OH protons in the silicoaluminophosphate were slightly dependent. The relationship between the H-1 chemical shifts of the Si-OH-Al groups in both types of molecular sieves, (delta(1H)) and their catalytic activities for n-butane cracking were examined at 673 K. The results shown in the paper lead to the conclusion that the delta(1H) values observed at the reaction temperature can be used as a tool to estimate the relative catalytic activities of aluminosilicate and silicoaluminophosphate with the same membered rings.
- リンク情報
- ID情報
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- DOI : 10.1021/acs.jpcc.6b00629
- ISSN : 1932-7447
- Web of Science ID : WOS:000375631100023