The role of the support and dispersion in the catalytic combustion of chlorobenzene on noble metal based catalysts

被引：81

作者：

van den Brink, RW ^{[1
]}

Krzan, M ^{[1
]}

Feijen-Jeurissen, MMR ^{[1
]}

Louw, R ^{[1
]}

Mulder, P ^{[1
]}

机构：

[1] Leiden Univ, Gorlaeus Labs, Leiden Inst Chem, NL-2300 RA Leiden, Netherlands

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 2000年 / 24卷 / 3-4期

关键词：

D O I：

10.1016/S0926-3373(99)00113-7

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：

Polychlorinated benzenes (PhClx) are formed as byproducts in the combustion of chlorobenzene on Pt supported on gamma-Al2I3, SiO2, SiO2-Al2O3, or ZrO2. The congener and isomer distribution of the PhClx differs for the various supports. The amounts of PhClx correlate with the dispersion of platinum. Thus, a Pt/gamma-Al2O3 catalyst calcined at 500 degrees C to yield very small Pt crystallites was more active in PhClx formation than Pt/gamma-Al2O3 calcined at 800 degrees C. In all cases T-50% for chlorobenzene conversion is close to 300 degrees C and appears to be independent of the crystallite size of the platinum. Replacing platinum by palladium led to lower rates of combustion and to more byproducts. These results lead us to propose that, in the presence of Cl and higher oxygen concentrations, small Pt crystallites are converted more easily into Pt(IV) species. These are less efficient in combustion, but can be more active in chlorination. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：255 / 264

页数：10

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