AMIRIDIS, MD NA, BK KO, EI 2024-01-21T21:13:12Z 2024-01-21T21:13:12Z 2022-01-10 1995-01 0097-6156 https://pubs.kist.re.kr/handle/201004/145401 Aerogels of titania, titania-silica, and titania-vanadia were prepared with titanium butoxide, silicon ethoxide, and vanadium triisopropoxide as precursors. The titania and titania-silica aerogels were then used as supports for vanadia, introduced by the incipient wetness impregnation of vanadium triisopropoxide and the subsequent calcination at 773 K. The structures of vanadia and titania in these samples were characterized by X-ray diffraction and Raman spectroscopy, and their catalytic properties by the selective catalytic reduction (SCR) of NO with NH3. With H2O and SO2 in the feed stream, the SCR activity decreased with increasing vanadia loading. Samples of high activity all contained anatase TiO2, but an active vanadia species only needed to be in close proximity and interacting with, and not necessarily deposited on the surface of crystalline titania. Co-gelling was thus an effective way to prepare an active sample in a single step, as demonstrated by the SCR data of the titania-vanadia aerogel. The addition of niobia, up to 10 weight %, did not appreciably change the surface area, structure, or SCR activity of the titania aerogel supported vanadia. English AMER CHEMICAL SOC NITRIC-OXIDE AMMONIA PHASE V2O5 GELS SELECTIVE CATALYTIC REDUCTION OF NO BY NH3 OVER AEROGELS OF TITANIA, SILICA, AND VANADIA Article 1 REDUCTION OF NITROGEN OXIDE EMISSIONS, v.587, pp.32 - 41 REDUCTION OF NITROGEN OXIDE EMISSIONS 587 32 41 scie A1995BD63S00003 Chemistry, Applied Chemistry, Physical Engineering, Chemical Chemistry Engineering Article; Proceedings Paper NITRIC-OXIDE AMMONIA PHASE V2O5 GELS NO