Observation of a hydrogen-induced shape resonance on Pt/LTL catalysts and its relation with support acidity/alkalinity

被引：27

作者：

Mojet, BL

Ramaker, DE

Miller, JT

Koningsberger, DC

机构：

[1] Univ Utrecht, Debye Inst, Dept Inorgan Chem & Catalysis, NL-3508 TB Utrecht, Netherlands

[2] George Washington Univ, Dept Chem, Washington, DC 20052 USA

[3] George Washington Univ, Inst Mat Sci, Washington, DC USA

[4] Amoco Res Ctr, Naperville, IL 60656 USA

来源：

CATALYSIS LETTERS | 1999年 / 62卷 / 01期

关键词：

shape resonance; metal-support interaction; XAFS spectroscopy; Pt/LTL; Pt-H bonding; support acidity/alkalinity;

D O I：

10.1023/A:1019018215806

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A novel analysis method of the platinum L-3 and L-2 X-ray absorption edges of Pt/LTL catalysts indicates that chemisorbed hydrogen induces an antibonding resonance state just above the Fermi level at the Pt L-3 edge. The difference in energy of this antibonding state (E-res) with respect to the Fermi level is strongly influenced by the acidity/alkalinity of the LTL support: E-res decreases with increasing alkalinity. The decrease in E-res can also be correlated with the decrease of the neopentane hydrogenolysis turnover frequency of Pt/LTL with increasing support alkalinity. These results provide the most direct experimental evidence that the support acidity/alkalinity alters the actual chemical bond between the surface platinum atoms and the reacting molecule.

引用

页码：15 / 20

页数：6

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