RESUMO
High-temperature arsenic resistance catalysts of CeLa0.5Fe x /Ti (x = 0, 0.1, 0.2, 0.3, 0.4, 0.5) series were prepared and measured under a simulation condition of arsenic poisoning. The as-prepared catalysts were characterized by XRD, SEM, TEM, and XPS. The specific surface area and pore size of the catalysts were measured. At x = 0.2, the catalyst shows the best arsenic resistance and catalytic performance. The active temperature range of the CeLa0.5Fe0.2/Ti catalyst is 345-520 °C when the gas hourly space velocity is up to 225 000 mL g-1 h-1. Compared with commercial vanadium-based catalysts, CeLa0.5Fe0.2/Ti shows much better catalytic performance. The introduction of Fe will improve the dispersion of CeO2 and increase the concentration of Ce3+ and unsaturated active oxygen on the surface. The NH3-TPD and H2-TPR results show that the CeLa0.5Fe0.2/Ti catalyst has more acidic sites and more excellent redox performance than CeLa0.5Fe0/Ti. The CeLa0.5Fe0.2/Ti catalyst might have application prospects in the field of selective catalytic reduction of NO x with NH3.
