CATALYST SUPPORT MATERIAL, VANADIA CATALYST, CATALYTIC DIESEL EMISSION DEVICE, DIESEL EMISSION CONTROL SYSTEM, METHOD FOR CATALYZING CONVERSION NITROGEN DEOXES FOR MATERIAL PRODATER MATERIALS A TITANIA CATALYST SUPPORT MATERIAL STABILIZED IN SILICA

摘要

vanadium catalysts, silica stabilized ultrafine titania anatase and methods of producing same The invention is directed to compositions and processes for the production of silica stabilized ultrafine anastase titans and further comprising tungsten and vanadia. surface stabilization may be by treating the low molecular weight Ti02 particles and / or in the form of small silica nanoparticles, such as in preferred embodiments a tetra (alkyl) ammonium silicate or silicic acid which serves to maintain the anatase phase efficiently and prevent crystal growth under severe thermal and hydrothermal conditions even in the presence of vanadia. vanadia catalysts produced from new titania have equal or greater catalytic activity for selective nox catalytic reduction over conventional vanadium supported titania-silica catalysts. The invention is more directed to catalytic diesel engine emission devices including new titania-based catalyst compositions.