- SILICA-STABILIZED ULTRAFINE ANATASE TITANIA VANADIA CATALYSTS AND METHODS OF PRODUCTION THEREOF

摘要

The present invention is silica - can be directed to a composition and a process of generating a stabilized anatase ultrafine titania (anatase ultrafine titania (anatase titania ultrafine)) further comprises a tungsten and vanadia (vanadia). Surface stabilization is, in a preferred embodiment, the tetra (alkyl) ammonium silicate (tetra (alkyl) ammonium silicate) process the TiO ₂ particles of silica having, or silicic acid (silicic acid) and the like, a low molecular weight and / or small nanoparticles form can be that which serves to maintain the efficient anatase phase (anatase phase) and, preventing the crystal growth under a vanadia even if (vanadia) is present, severe heat conditions and the hydrothermal conditions (hydrothermal condition). Vanadia catalyst (vanadia catalyst) produced in a novel titania (titania) is a conventional vanadia silica support (vanadia) - for selective catalytic reduction of the same or improved NOx as compared with the titania-based catalyst (catalytic reduction) have a catalytic activity. The invention also relates to a novel titania (titania) based catalyst composition of diesel exhaust catalyst system (diesel emission catalytic device) comprising a. ;