Effect of gamma-irradiation on surface and catalytic properties of CuO−ZnO/Al2O3 system

G. El-Shobaky; A. Ahmad; M. Mokhtar

doi:10.1007/bf02040271

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Journal of Radioanalytical and Nuclear Chemistry

Volume/Issue:: Volume 219: Issue 1

Effect of gamma-irradiation on surface and catalytic properties of CuO−ZnO/Al₂O₃ system

Authors:

G. El-Shobaky

G. El-Shobaky National Research Centre Dokki Cairo Egypt

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A. Ahmad

A. Ahmad Cairo University Chemistry Department, Faculty of Science Cairo Egypt

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M. Mokhtar

M. Mokhtar National Research Centre Dokki Cairo Egypt

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Pages:: 89–94

Online Publication Date:: 14 Aug 2005

Publication Date:: 17 May 1997

Article Category:: Research Article

DOI:: https://doi.org/10.1007/bf02040271

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Abstract

A copper, zinc and aluminium mixed oxides sample having the nominal composition 0.25 CuO/0.03 ZnO/Al₂O₃ was prepared by impregnating Al(OH)₃ with copper and zinc nitrate solutions, drying at 100 °C then heating in air at 600 °C. The obtained solid was exposed to different doses of -rays (20–160 Mrad). The surface characteristics namelyS_BETV_P andr of different treated adsorbents were determined from N₂ adsorption isothems measured at –196 °C. The catalytic activity of various irradiated solids was determined by following up the kinetics of CO-oxidation by O₂ at 150–200 °C. The results showed that the doses up to 80 Mrad resulted in no significant change in theS_BET but increased slightly theV_P (20%) of the treated adsorbents. The irradiation at 160 Mrad caused an increase of 20% in theS_BET of the irradiated solid sample. The catalytic activity increased progressively by increasing the dose, a dose of 160 Mrad brought about an increase of 140% in the catalyst's activity. The apparent activation energy of the catalytic reaction decreased monotonically by increasing the absorbed dose of -rays which was attributed to a parallel induced decrease in the value of pre-exponential term of the Arrhenius equation. The observed increase in the catalytic activity due to -irradiation has been interpreted as a result of increasing the concentration of catalytically-active sites contributing in chemisorption and catalysis of CO-oxidation via a possible fragmentation of CuO crystallites.

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Journal of Radioanalytical and Nuclear Chemistry

Print ISSN:: 0236-5731

Online ISSN:: 1588-2780

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Journal of Radionalytical and Nuclear Chemistry
Language	English
Size	A4
Year of Foundation	1968
Volumes per Year	1
Issues per Year	12
Founder	Akadémiai Kiadó
Founder's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher	Akadémiai Kiadó Springer Nature Switzerland AG
Publisher's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible Publisher	Chief Executive Officer, Akadémiai Kiadó
ISSN	0236-5731 (Print)
ISSN	1588-2780 (Online)