Exploring the Synergistic Performance of a Pt-Rh/γ-Al2O3 Catalyst for the Reduction of NO with H2
نویسندگان
چکیده
Several researchers have shown that Pt-Rh bimetallic catalysts can perform synergistically for the NO/H2, NO/CO, CO/O2, and NO/CO/HC reactions [1-5]. Lakis and coworkers clarified some of the mystery surrounding the synergistic performance of Pt-Rh catalysts for the NO + H2 reaction by using analytical electron microscopy (AEM) to show that the synergistic performance of a Pt(95%)Rh(5%)/γ-Al2O3 was due to the presence of a singlephase of supported Pt-rich nanoparticles while non-synergistic Pt-Rh catalysts with increased Rh fractions contained both Pt-rich and Rh-rich nanoparticles [2, 3]. This study uses in-situ FTIR spectroscopy with NO and NO + H2 as probes to explore the synergistic performance of a Pt(95%)-Rh(5%)/γ-Al2O3 catalyst for the reduction of NO with H2, with the goal of verifying the presence of surface segregated Rh on the synergistic catalyst under reaction conditions.
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