Platinum group metals substituted MCM-41 molecular sieves: Synthesis, characterization and application as novel catalysts for the reduction of NO by CO

Mesoporous MCM-41 molecular sieves with Si/M (molar) ratios of 100 containing platinum group metals (Pd, Pt, Rh, Ir) were synthesized by the hydrothermal method. These catalysts were systematically characterized by various analytical and spectroscopic techniques, viz., XRD, TEM, DRUV–vis, N2 sorption. XRD analysis confirmed that the presence of platinum metals did not influence the parent structure and phase purity of the MCM-41 catalysts. DRUV–vis spectral studies of MCM-41 indicate the presence of platinum metal ions. The catalytic activities of these catalysts were evaluated for the reduction of NO by CO as a function of temperature. The study revealed that the catalytic activity is, in the order (Rh>Ir>Pd>Pt). Our experimental results are in good agreement with theoretical previous analysis based on the NO* dissociation activation energy.

Graphical abstractMesoporous MCM-41 molecular sieves with Si/M (molar) ratios of 100 containing platinum group metals were synthesized hydrothermally. These catalysts were systematically characterized by various analytical and spectroscopic techniques. The study revealed that catalytic activity for the reduction of NO by CO is in the order Rh > Ir > Pd > Pt, as seen in the figure below.Figure optionsDownload full-size imageDownload as PowerPoint slide