Catalytic Pt/Al 2 O 3 Monolithic Foam for Ethanol Reforming Fabricated by the Competitive Impregnation Method

• Published in: ACS omega Vol. 8; no. 7; pp. 6507 - 6514
• Main Authors: Silva Júnior, Mauro E, Palm, Maíra O, Duarte, Diego A, Catapan, Rafael C
• Format: Journal Article
• Language: English
• Published: United States 21.02.2023
• ISSN: 2470-1343; 2470-1343
• DOI: 10.1021/acsomega.2c06870

Here, the synthesis of Pt/Al O catalysts on a monolithic foam employing the competitive impregnation method is presented. NO was used as a competitive adsorbate at different concentrations in order to delay the adsorption of Pt, minimizing the formation of Pt concentration gradients throughout the monolith. The catalysts' characterization includes the BET, H -pulse titration, SEM, XRD and XPS techniques. The catalytic activity evaluation was performed under partial oxidation and autothermal reforming of ethanol in a short contact time reactor. The competitive impregnation method was able to produce better dispersion of the Pt particles through the Al O foams. XPS analysis indicated the catalytic activity of the samples, by the presence of metallic Pt and Pt oxides (PtO and PtO ) in the internal regions of the monoliths. Compared to other Pt catalysts reported in the literature, the catalyst produced by the competitive impregnation method was revealed to be selective toward H . Overall, the results showed that the competitive impregnation method employing NO as the co-adsorbate is a promising technique to synthesize well dispersed Pt catalysts over α-Al O foams.