Brief history of denitration catalyst development

Catalyst is the core part of SCR technology, which determines the denitrification efficiency and economy of SCR system. Its construction cost accounts for more than 20% of the flue gas denitrification project cost, and its operation cost accounts for more than 30%. In recent years, the United States, Japan, Germany and other developed countries have continuously invested a lot of manpower, material resources and funds to develop efficient and low-cost catalysts for flue gas denitrification, and attached importance to the protection of intellectual property rights in the process of catalyst patent technology, technology transfer and production license.

The initial catalysts were metal catalysts such as Pt-Rh and Pt, and monolithic ceramics such as alumina were used as carriers, which had the characteristics of high activity and low reaction temperature, but the high price limited its application in power plants.

Therefore, since the late 1960s, three Japanese companies, Hitachi, Mitsubishi and Takeda Chemical, have developed catalysts based on TiO2 through continuous research and development, and gradually replaced Pt-Rh and Pt series catalysts. The components of this kind of catalyst are mainly V2O5(WO3), Fe2O3, CuO, CrOx, MnOx, MgO, MoO3, NiO and other metal oxides or their mixtures. Usually, in the SCR system, TiO2 _ 2, Al _ 2O _ 3, ZrO2 _ 2, SiO2 _ 2 and activated carbon (AC) react with reducing agents such as liquid ammonia or urea, which has become the application of SCR denitrification engineering in power plants.