OP-II-3

NOx conversion vs. temperature is presented inFig. 1. Here, 1 – commercial catalyst AVK-10(V 2 O 5 /Al 2 O 3 ); 2 – new catalyst BIC-1(V 2 O 5 -WO 3 /TiO 2 .Nanostructured catalyst (2) BIC-1 features byincreased thermal stability and mechanicalPP-III-130200 300 400 500 600strength. At the same activity, working temperature range of (2) is broader than thatof (1), no N 2 O is produced even above stoichiometric ratio NH 3 /NO x , see Table 2.Conversion of NOx, %10080604020Fig. 1.21T, о CTable 2 Concentration of NO X and N 2 O after SCR in lab-scale reactorTemperature, °C 250 300 350-400 500-550Concentration, ppm NOx N 2 O NOx N 2 O NOx N 2 O NOx N 2 OCatalystsAVK-10 478 - 41 - 0 2 0-2 23-50BIC-1 462 - 0 - 0 0 0 2-10Activity of zeolite-based catalysts in lowtemperatureN 2 O decomposition was studied at: (1)GHSV – 7200 h –1 , [NO] – 1000 ppm, [N 2 O] – 700ppm, [O 2 ] – 4.5 % vol., [H 2 O] – 2.0 % vol., [He] –balance; (2) added [NH 3 ] – 1100 ppm, see Fig.2.Catalyst BIC-2 (Fe/ZSM-5) showed the best activityand stability, conversion of N 2 O under 450°C was as0200 300 400T, о C500high as 97-99%. No significant effect of inlet NH 3 wasFig. 3observed.Effluent gasesto reactorBIC-1BIC-2industrial values.NH 3CleanedgasesConversion of N2O, %1008060402012Fig. 2Starting from these preliminary results, we haveproposed the combined approach to low-temperaturecatalytic abatement of NOx+N 2 O for UKL-7 in existingreactor, using BIC-1 (or AVK-10) and BIC-2 catalysts, seeFig.3. Expected conversion of NOx is 96.5-98%,conversion of N 2 O 97-99% at: GHSV – 4,200 h –1 , inlettemperature 300-350°C, other inlet parameters – close toReferences[1]. F.Kapteijn, J.Rodriguez-Mirasol, J.A.Moulijn, Appl. Catal. B: Environ., 1996, vol. 9, is.1-4, pp.25-64.[2]. M.Kogel, B. Abu-Zied, M.Schwefer, T.Turek, Catal. Commun., 2001, vol.2, is.9, pp.273-276.[3]. M.Groves, R.Maurer, M.Schwefer, R.Siefert, Report at: NITROGEN 2006 Intern. Confer., Vienna,Austria – March 14th, 2006.463