Abstract
Support effects in NOx storage-reduction (NSR) have been investigated by means of space- and time-resolved in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) using Pt−Ba catalysts supported on six different metal oxides (MOx = Al2O3, TiO2, SiO2, CeO2, ZrO2, and Ce0.5Zr0.5O2) and hydrogen as reductant. The NSR performance was significantly influenced by the type of oxide supports. The NOx storage capacity followed the order CeO2 > Ce0.5Zr0.5O2 > Al2O3 > ZrO2 > TiO2 > SiO2, which is in agreement with the basicity of the oxides. In contrast, the rate of NOx reduction showed the reverse order. The study shows that storage and reduction of NOx and spillover processes are influenced by the type of support. As a result of this, the support material also affects the concentration gradients along the catalyst bed which in turn has an effect on the NSR performance. Strong basicity is beneficial for efficient NOx storage during lean periods but decreases the rate of NOx reduction during ric...
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