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A study of alumina–zirconia mixed oxides prepared by the modified Pechini method as Co catalyst supports in CO hydrogenation

Paper ID Volume ID Publish Year Pages File Format Full-Text
44705 46056 2006 5 PDF Available
Title
A study of alumina–zirconia mixed oxides prepared by the modified Pechini method as Co catalyst supports in CO hydrogenation
Abstract

In this study, the modified Pechini method has been used to prepare alumina–zirconia mixed oxides with 0.5, 1, 25, 40, and 75 mol% of alumina in zirconia. At low Al contents (<25%), tetragonal phase zirconia was observed, while at higher Al contents, the mixed oxide exhibited only amorphous phase. When they were employed as supports for Co catalyst for CO hydrogenation, it was found that the catalytic activities of low Al-modified zirconia supported Co catalysts increased by ca. 30% compared to the ones supported on pure zirconia or pure alumina, suggesting that the modification of zirconia by alumina has resulted in higher Co dispersion. However, when supports with high alumina contents (40–75 mol% Al) were used, low Co dispersion and poor catalytic performance were obtained despite their higher surface areas. It is likely that cobalt formed metal support compounds with the amorphous phases of these mixed oxides.

Keywords
Nano-crystalline zirconia; Alumina–zirconia mixed oxides; CO hydrogenation; Cobalt catalysts
First Page Preview
A study of alumina–zirconia mixed oxides prepared by the modified Pechini method as Co catalyst supports in CO hydrogenation
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 303, Issue 2, 28 April 2006, Pages 268–272
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis