LOCALIZATION AND STRUCTURE OF CARBONACEOUS DEPOSITS ON REFORMING CATALYSTS

被引：19

作者：

ESPINAT, D ^{[1
]}

FREUND, E ^{[1
]}

DEXPERT, H ^{[1
]}

MARTINO, G ^{[1
]}

机构：

[1] LAB UTILISAT RAYONNEMENT ELECTROMAGNET,F-91401 ORSAY,FRANCE

来源：

JOURNAL OF CATALYSIS | 1990年 / 126卷 / 02期

关键词：

D O I：

10.1016/0021-9517(90)90016-D

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：

The aging of alumina-supported Pt-containing reforming catalysts by "coke" deposition has previously been extensively investigated. In the present work, a large number of techniques including optical and electron microscopy have been used to determine both the localization and the structure of the so-called "coke" (carbonaceous deposits) formed during the normal operation of these catalysts. The coke is not uniformly deposited on the surface of the catalysts. Its structure is not uniform for a given catalyst, and depends on the operating conditions (especially the H2/hydrocarbon ratio) as well as the composition of the metallic phase (pure platinum or multimetallic alloy). The structure is always rather well organized (pregraphitic) even at the onset of coke deposition. © 1990.

引用

页码：496 / 518

页数：23