Enhancing the K resistance of CeTiO_x catalyst in NH₃-SCR reaction by CuO modification

It is generally accepted that CeTiO_x catalyst owns outstanding catalytic activity for ammonia-selective catalytic reduction (NH₃-SCR), but the tolerance to alkali metals is still dissatisfactory. Thus, it is of great importance to further elevate the catalytic activity and resistance to alkali metals of CeTiO_x catalyst. In our work, a series of CeTiO_x, CuO/CeTiO_x, K-CeTiO_x and K-CuO/CeTiO_x catalysts were prepared to comprehensively analyze the influence of CuO modification on the physicochemical features, catalytic activity and anti-K ability of CeTiO_x catalyst. The results manifest that CuO modification effectively enhances low-temperature catalytic activity and anti-K poisoning ability of CeTiO_x catalyst by protecting the reduction ability and the surface acidity as well as weakening the adsorption strength of NO_x.