How Does Zinc Species Affect the Performance of CeO₂–TiO₂ Catalysts for Selective Catalytic Reduction of NO with NH₃? A Comparative Laboratory Experiment

Abstract

The flue gas from waste incineration power plants contains high-level zinc species that may deactivate the catalyst for selective catalytic reduction (SCR) of nitrogen oxides (NO x ) with NH 3 . A comparison experiment was designed to investigate the effect of different types and Zn/Ce molar ratios on the performance of CeO 2 −TiO 2 catalysts for the senior undergraduates majoring in energy, environmental, and chemical engineering. This possible inactivation mechanism of CeO 2 − TiO 2 SCR catalysts was explored by using X-ray diffraction (XRD), N 2 adsorption, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTs). After this comparative laboratory experiment, students can comprehend the principles and processes of SCR technology, learn the preparation methods and characterization of the catalyst, and grasp scientific thinking methods for analyzing and solving a practical problem. Meanwhile, students are guided to realize the environmental issues of industrial processes and understand the limitations of SCR technology. In addition, this comprehensive experiment plays an important role in strengthening students' experiment skill and solving a practical problem using interdisciplinary knowledge.