Hydrotalcite-derived mixed metal oxides for NH3-SCO and NH3-SCR-DeNOx reactions

In the present study hydrotalcite’s derived mixed metal oxides (MMO) were investigated as catalyst for both NH3-SCO and NH3-SCR-DeNOx. These materials can be simply tailored in the composition and provide a wide range of applications and properties. They have been studied for many years and are one of the best solutions playing a crucial role in catalysis. Therefore, the main part of the study was devoted to the synthesis of hybrid material composites with an optimized method in order to obtain homogeneous MMO-zeolite catalysts according to the previous studies of L. Chmielarz, M. Jabłońska et al. Cu-Mg-Al hydrotalcite-like materials, containing zeolites, were synthesized by co-precipitation method followed by calcination at 600°C for 12 h. Further research into the positive or negative effect that new compounds had on the catalytic performance was investigated looking for the highest catalytic activity. Characterization of the catalyst was performed to understand its physical, chemical, and structural properties. Crystalline structure of the as-synthesized and calcined hydrotalcite-like materials was explored through X-ray diffraction (XRD). Nitrogen sorption isotherms and average pore size distribution were measured by the BJH method and mercury intrusion was carried out to investigate the textural properties. Inductively coupled plasma optical emission spectroscopy (ICP-OES) was aimed at measuring the chemical compositions. The redox properties of the catalysts were studied by temperature programmed reduction method (H2-TPR). The optical properties and electronic structure as well as transition metal species present in the samples were studied by UV-vis-DR method.