Abstract
This paper reports a study about the behaviour of different Pt-based catalysts supported on Al 2O 3, Na–Al 2O 3, K–Al 2O 3 and ZrO 2 in methane reforming with CO 2. Results indicate that Pt/Na (0.3 wt%)-Al 2O 3 and Pt/ZrO 2 catalysts show both a good activity and selectivity with a very high catalytic stability at 1073 K. The Pt/K (0.3 wt%)-Al 2O 3 catalyst showed a good performance but a slightly lower conversion level than Pt/Na (0.3 wt%)-Al 2O 3. On the other hand, the Pt/Al 2O 3 catalyst displayed an important decrease of the methane conversion through the reaction time at 1073 K and hence, a lower catalytic stability due mainly to the carbon deposition. It can be concluded that either Na or K addition to Pt/Al 2O 3 enhances the catalytic stability since they provide basic sites, which favour the dissociation reaction of CO 2 into CO and O. The O species can react with the carbon deposited on the Pt, thus cleaning the metallic phase of the doped catalysts.
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