Comparison of the Activity of Pt/Al2O3 and of Pt/CeO2/Al2O3 to CO Oxidation Reaction

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Published: Mar 30, 2018
Keywords:
CO oxidation, Platinum over alumina, sol gel method, ceria, oxygen storage properties

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Akkarat Wongkaew*
Chemical Engineering Department, Faculty of Engineering, Burapha University, Chonburi, Thailand.

Abstract

The activity of platinum promoted with ceria over alumina to CO oxidantion reaction was investigated over temperature range of 100°C to 200°C. The results indicated that the presence of ceria doped in alumina as a support dramatically enhanced the activity of platinum over pure alumina. This can be observed from T1/2 of each catalyst. From the experiments, T1/2 of the 5% Pt/Al2O3 was 170°C while T1/2 of the 5%Pt/15%CeO2/Al2/O3 was 145°C. This behavior can be explained from the FTIR results. Under the condition that 1%CO in He was purged over the 5%Pt/15CeO2/Al2/O3, CO2 was observed. This implied that the formation of CO2 occurred from reaction between CO molecules and O atoms from ceria lattice. These catalysts were tested under different oxygen concentrations. The results showed that the CO conversion for the 5%Pt/15%CeO2/Al2/O3 at a range of 100°C to 150°C was not different under 1%O2 and 2%O2 respectively. On the other hand, for the 5% Pt/Al2O3, CO conversion at the studied temperatures incredibly increased with the increasing of O2  concentration from 1% O2 to 2%O2. Therefore, the improvement of the performance of platinum over alumina to CO oxidation at temperatures less than 160°C can be done by doping with a little amount of ceria.


Keywords: CO oxidation, Platinum over alumina, sol gel method, ceria, oxygen storage properties


Corresponding author: E-mail: [email protected]

Article Details

Issue
Vol. 6 No. 2b (2006)
Section
Original Research Articles

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