Nanocatalysis on Supported Oxides for CO Oxidation.

Glaspell, Garry; Hassan, Hassan M. A.; Elzatahry, Ahmed; Abdalsayed,
Victor; El-Shall, M. Samy. Department of Chemistry, Virginia
Commonwealth University, Richmond, VA, USA. Topics in Catalysis
(2008), 47(1-2), 22-31. Publisher: Springer, CODEN: TOCAFI ISSN:
1022-5528. Journal written in English. AN 2008:340239 CAPLUS

Abstract

Active gold and palladium nanoparticles supported on a variety of oxides
(CeO2, ZrO2, Al2O3, SiO2, MgO and ZnO) were synthesized using laser
vaporization and microwave irradn. methods. The catalytic activities
for CO oxidn. on the nanoparticle catalysts were evaluated and compared
among different oxide supports. The effect of shape on the catalytic
activity is demonstrated by comparing the activities of the Au and Pd
catalysts deposited on MgO nanocubes and ZnO nanobelts. The Au/CeO2
nanoparticles deposited on MgO nanocubes exhibit high catalytic activity
and stability. The enhanced catalytic activity is attributed to the
presence of a significant concn. of the corner and edge sites in MgO
nanocubes. The Au- and Pd-doped Mn2O3 nanoparticles show promising
results for the low temp. CO oxidn. Several approaches for
incorporating the Au and Pd nanocatalysts within mesoporous oxide
supports are presented and discussed.