III International Conference

PP-III-46[2]. Note that the activity of impregnated catalysts did not change in the presence of H 2 O. Forcoprecipitated sample (5%In 2 O 3 -95%Al 2 O 3 ) the catalytic activity slightly decreases. This isprobably caused by competitive adsorption of H 2 O with NO and C 3 H 6 at the catalyst activesites.Converssion of NO, %70 123604550403020Fig.1.Temperature dependences of NOconversion for 5%In 2 O 3 /Al 2 O 3 catalystin SCR by HC in reaction mixtures/0.05% NO + 0.09% C n H m + 5%O 2 /:1 - C 3 H 6 ; 2 - C 3 H 6 + 9%Н 2 О; 3 - CH 4 ;4 - C 3 H 8 - C 4 H 10 ; 5 -C 3 H 6 +0.01% SO 2 .100300 350 400 450 500 550Temperature, 0 CThe observed decreasing of the activity of 5%In 2 O 3 /Al 2 O 3 in the presence of SO 2 inreaction feed (fig. 1. curves 1, 5) can be the result of aluminum and indium sulfates formationwith following decreasing of concentration of active sites on the surface [3].Thus, the activity of indium containing catalysts in SCR of NO by light hydrocarbonsdepends on the amount of indium, nature of the support and preparation method. No activitydecreasing due to the presence of H 2 O was observed for In 2 O 3 /Al 2 O 3 samples, while to SO 2the samples are less tolerant.References1. C. Luo, J. Li , Y. Zhu, J. Hao. Cat.Today, 119, 2007, Р.48.2. T.V.Mironyuk, S.N.Orlyk. Appl.Catal.B: Environmental, 2006 (doi: 10.1016/j.apcatb.2005.11.024).3. J. Li, J. Hao, X. Cui, L. Fu. Catal. Lett. 103, 2005, P.75.556