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Four high-surface-area (50–60m2/g) perovskite-based powder catalysts, Pd-doped LaFeO3, Pd-impregnated LaFeO3, Rh-doped CaTiO3, and Rh-impregnated CaTiO3, were characterized by scanning transmission electron microscopy and CO oxidation measurements in fresh and redox-aged (14h at 800°C) states. Both intrinsic catalytic activity and stability were significantly higher in Pd-doped LaFeO3 than in Rh-doped...
The hydrothermal stability of Cu/beta NH 3 SCR catalysts are explored here. In particular, this paper focuses on the interesting ability of this catalyst to maintain and even enhance high-temperature performance for the “standard” SCR reaction after modest (900°C, 2h) hydrothermal aging. Characterization of the fresh and aged catalysts was performed with an aim to identify possible catalytic...
A flow cell was used for the monitoring of the state of copper ions in Cu-ZSM-5 in situ at high temperatures by e.s.r. Reduction of the most reactive square-planar coordinated Cu 2+ ions to Cu + occurs at 500°C in methane flow. The reoxidation of cuprous to cupric ions at 500°C by NO or O 2 is very fast; and, at 500°C, in mixtures of CH 4 with excess oxygen,...
A flow cell was designed for the monitoring of the state of copper ions in Cu-ZSM-5 in situ at high temperatures by e.s.r. In thoroughly purified He or in vacuum there is no spontaneous reduction of the cupric ions up to 500°C. The formation of adsorption complexes between isolated Cu 2+ cations and NO molecules at 20°C leads to a measurable change in coordination. Strong adsorption...
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