TUNGSTEN/TITANIA-BASED COMPOSITE OXIDE CARRIER AND PREPARATION THEREOF, AND DENITRIFICATION CATALYST USING SAME CARRIER AND PREPARATION THEREOF

摘要

The present invention relates to a method for preparing a vanadium/tungsten/titania-based denitrification catalyst, which provides improved thermal durability to the catalyst provided at the end portion of an exhaust gas treatment device of various emitting sources using a diesel engine in order to remove gaseous nitrogen oxides, against high-temperature heat energy caused by abnormal ignition occurring during a DPF regeneration process in the device. More particularly, the present invention provides a method which includes: allowing an additive/tungsten/titania composite oxide carrier used as a carrier for preparing the catalyst for enhancing thermal durability to be bound in such a manner that a Ti-O-Me binding structure may be formed; and supporting vanadium as an active metal in the carrier. Then, silica and titania as additives are bound to the carrier to produce a Ti-O-Si species, which has a binding structure having enhanced thermal durability, through an impregnation process. In this manner, it is possible to inhibit a decrease in specific surface area of the catalyst under high-temperature heat energy, to suppress phase transfer of titania and aggregation of vanadium so that crystallization may be reduced, and to inhibit formation of a Ti-V-O species lost into titania due to vanadium sintering. In addition, the specific surface area of the carrier having optimized thermal durability is controlled by adjusting firing temperature, and the structural species of vanadium as an active metal is formed into polymeric V. Thus, it is possible to enhance SCR reaction activity, and to provide a catalyst having excellent thermal stability and denitrification efficiency by supporting additives enhancing thermal durability, when preparing a vanadium/tungsten/titania-based catalyst.;COPYRIGHT KIPO 2020