Density functional study for estimating Brønsted acid site strength in isomorphously substituted ZSM-5

A. Chatterjee, T. Iwasaki, T. Ebina, A. Miyamoto

研究成果: Article査読

66 被引用数 (Scopus)

抄録

We use local density functional theory to study the Brønsted acid strength of a series of clusters that model a catalytic acid site within zeolite ZSM-5. We consider models of the formula (A)3Si-OH-T(A)3 where A = OH and OSi(OH)3; T = Si, Al, B, Ga or Fe. We have studied the effect of replacing Si with trivalent metal cations on the structure and acid strength of the zeolite ZSM-5. Our results also show the effect of cluster size on the calculated properties. It is suggested that a more accurate descriptor of the decreased electron density around the hydroxyl hydrogen would be the electrostatic potential calculated on the total electron density surface. We studied the molecular electrostatic potential maps for the cluster models to test this fact. It is observed that the calculation results predict that acid strength increases in the order B-ZSM-5<Fe-ZSM-5<Ga-ZSM-5<Al-ZSM-5, which shows a good agreement with experimental results. The results show a prospective trend to predict properties of metal substituted zeolites which a special emphasis on Brønsted acid strength of zeolites.

本文言語English
ページ(範囲)421-428
ページ数8
ジャーナルMicroporous and Mesoporous Materials
21
4-6
DOI
出版ステータスPublished - 1998 5月

ASJC Scopus subject areas

  • 化学 (全般)
  • 材料科学(全般)
  • 凝縮系物理学
  • 材料力学

フィンガープリント

「Density functional study for estimating Brønsted acid site strength in isomorphously substituted ZSM-5」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル