MISC

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
  • Yoshihiro Hayashi
  • ,
  • Akimitsu Miyaji
  • ,
  • Ken Motokura
  • ,
  • Naoki Asakawa
  • ,
  • Toshihide Baba

120
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
DOI
https://doi.org/10.1021/acs.jpcc.6b00629
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000375631100023&DestApp=WOS_CPL
ID情報
  • DOI : 10.1021/acs.jpcc.6b00629
  • ISSN : 1932-7447
  • Web of Science ID : WOS:000375631100023

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