abstracts - Институт катализа им. Г.К. Борескова

YP-13CATALYTIC ACTIVITY AND PHYSICOCHEMICAL PROPERTIES OF Au/TiO 2SYSTEMS FOR CO OXIDATIONJozwiak W.K., Kaczmarek E., Ignaczak W.Institute of General and Ecological Chemistry, Technical University of Lodz, Zeromskiego116, 90-924 Lodz, PolandE-mail: ekaczmarek78@interia.plSupported gold catalysts appear very active in carbon monoxide oxidation reaction.Despite of extensive research efforts still many problems are not fully resolved. The aim ofthis work was to find correlation between Au/TiO 2 catalysts activity and methods of theirpreparation (impregnation and deposition-precipitation), the influence of alkali ions additives,content of gold phase and temperature of calcination in air. The physico-chemical propertiesof Au/TiO 2 catalysts were investigated by TPR, BET, XRD and catalytic activity methods.The influence of preparation method for 1% Au/TiO 2 catalysts on CO conversion ispresented in figure 1. Catalysts prepared by deposition-precipitation appeared much moreactive than those obtained by impregnation method. The activity of impregnated catalysts canbe considerable improved by alkali doping. Titania itself shows also catalytic activity but inhigher temperature range, above 400°C. The addition of potassium moves catalytic activity ofsupport to much lower temperature of CO oxidation.100803Conversion CO [%]6040202B2A1B1A00 100 200 300 400 500 600 700 800Temperature [ 0 C]Figure 1. The influence of preparation method on CO conversion degree:1A – TiO 2 , 1B –TiO 2 + 10% KOH, 2A –1% Au/TiO 2 (impregnation),2B – 1% Au/TiO 2 (impregnation + 10% KOH), 3 – 1% Au/TiO 2 + Na 2 CO 3(deposition-precipitation)The influence of gold loading on CO conversion degree is presented in figure 2.The 1% Au/TiO 2 catalyst shows activity only above 300°C, whereas 2-10% Au/TiO 2 catalystsare active up to 100 °C.451