Selective catalytic reduction (SCR) flue gas denitrification catalyst and preparation method thereof

The invention discloses a selective catalytic reduction (SCR) flue gas denitrification catalyst and a preparation method thereof. The components of the denitrification catalyst comprise titanium dioxide serving as a catalyst, manganese dioxide serving as a main active component, tungsten trioxide serving as a cocatalyst, and aluminum oxide gel serving as a structural supporting material for bonding the denitrification catalyst into particles. The preparation method comprises: loading ammonium tungstate and manganese acetate, which serve as transitional components, on titanium dioxide, adding aluminum oxide gel for bonding and serving as the structural support of the titanium dioxide, and preparing catalyst particles by forming; and drying gradually at different times and roasting for activating; and thus, preparing the SCR flue gas denitrification catalyst disclosed by the invention. In the invention, the temperature window of the catalyst is enlarged, high denitrification activity iskept in a temperature ran