A Facile Approach of Fabricating Bifunctional Catalysts for Redox Applications by Uniformly Immobilized Metallic Nanoparticles on NiCr LDH

This study discloses the development of NiCr LDH, Ag@NiCr LDH, and Pd@NiCr LDH bifunction catalysts using a hydrothermal coprecipitation method followed by sol immobilization of metallic nanoparticles. The structures and morphologies of the synthesized nanocomposites were analyzed using FTIR, XRD, XPS, BET, FESEM-EDX, and HRTEM. The catalytic effectiveness of the samples was evaluated by tracking the progression of NaBH4-mediated nitrobenzene (NB) reduction to aniline and CO oxidation using UV-visible spectrophotometry and an infrared gas analyzer, respectively. Pd@NiCr LDH displayed much higher performance for both reactions than the bare NiCr LDH. The catalyst Pd@NiCr LDH showed robust catalytic activity in both the oxidation of carbon monoxide (T-50% (136.1 degrees C) and T-100% (200.2 degrees C)) and NaBH4-mediated nitrobenzene reduction (98.7% conversion and 0.365 min(-1) rate constant). The results disclose that the Ni2+@ Cr3+/Cr6+ @Pd degrees ion pairs inside the LDH act as a charge transfer center and hence significantly enhance the catalytic performance. As a result, this research offers the novel NiCr LDH catalyst as a bifunctional catalyst for air depollution control and the organic transformation process.

Automated summary

This study developed NiCr LDH, Ag@NiCr LDH, and Pd@NiCr LDH bifunction catalysts, and analyzed their structures and morphologies using various techniques. The catalytic effectiveness of these catalysts was evaluated for CO oxidation and nitrobenzene reduction. Pd@NiCr LDH showed superior catalytic activity in both reactions, indicating the importance of the Ni2+@ Cr3+/Cr6+ @Pd degrees ion pairs as charge transfer centers. This research provides a novel NiCr LDH catalyst for air depollution control and organic transformation.