Investigating of reduction temperature impacts on the CO adsorption and oxidation capabilities using Pt–Sn/Al2O3 catalyst

The objective of the present study is to examine how the reduction temperature affects the performance of 1.2%Pt–2.7%Sn/Al 2 O 3 catalysts in the process of adsorption and oxidation of CO within the temperature range of 300–713 K. This investigation involved conducting experiments on two different reduced catalyst samples. The catalysts were synthesized through a process of co-impregnation the alumina support with the acidic solutions containing H 2 PtCl 6 and SnCl 2 using [HCl] = 1 M as solvent. FTIR spectroscopy is used to study CO adsorption (1%CO/He) and CO oxidation (1%CO/2%O 2 /He). The modifications in the infrared spectrum of the linear CO molecule were observed as the Ta increased under isobaric conditions: An alteration in the surface of Pt–Sn particles, which were reduced at 623 K, becomes evident at a pressure of 1000 Pa which attributed to the surface reconstruction produced by the increase in Pt° content. The second surface Pt–Sn reduced at 723 K is stable while rising in T a in the presence of CO. The surface reconstruction observed on the two catalysts during CO oxidation may be attributed to the formation of SnOx species, which likely originate from oxygen species derived primarily from the hydroxyl groups present in the alumina support.