DRIFT study of CO chemisorption on organometallics-derived Pd/MgO catalysts: The effect of chlorine

被引：26

作者：

Kappers, M ^{[1
]}

Dossi, C ^{[1
]}

Psaro, R ^{[1
]}

Recchia, S ^{[1
]}

Fusi, A ^{[1
]}

机构：

[1] UNIV MILAN, CTR CNR, I-20133 MILAN, ITALY

来源：

CATALYSIS LETTERS | 1996年 / 39卷 / 3-4期

关键词：

DRIFT spectroscopy; CO chemisorption; Pd/MgO catalysts; reforming; chlorine effect;

D O I：

10.1007/BF00805581

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：

Magnesia-supported palladium catalysts were prepared from chemical vapour deposition (CVD) of [Pd(C3H5)(C5H5)] and incipient wetness impregnation of [Pd(C3H5)Cl](2) and [Pd(acac)(2)]. DRIFT spectroscopy of adsorbed CO on prereduced catalysts indicates that the electronic state of metal particles depends on the preparation methodology and markedly on the organometallic precursor. Inn-heptane reforming at 500 degrees C, the highest activity and selectivity were shown by the CVD-based system. Chloride ions deriving from the impregnation solvent exchange with surface hydroxyls. Acidic Mg-Cl sites are thus formed, which induce a beneficial effect on the catalytic properties. The reforming activity collapsed when a chlorine-containing precursor was used, due to a partial coverage of the palladium surface with chemisorbed chlorine atoms.

引用

页码：183 / 189

页数：7

共 40 条

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