Composite catalyst flue gas denitrating under low-temperature condition and method of preparing the same

The invention relates to a composite catalyst used for denitrification of flue gases under low-temperature conditions. The catalyst contains a Ti/Zr composite oxide as carrier, an oxide of manganese as catalytically-active component, and at least one oxide of vanadium, chromium, iron, copper, nickel and cerium as auxiliary agent. The Ti/Zr composite oxide is prepared by coprecipitation method and loads the catalytically-active component and the auxiliary agent by immersion method, wherein the mole ratio of Ti/Zr in the composite oxide is controlled in a range from 0.25 to 4, the oxide of manganese accounts for 1-15% of the weight of the Ti/Zr composite oxide, and the auxiliary agent accounts for 1-5% of the weight of the Ti/Zr composite oxide. The catalyst has good catalytic activity at low temperature and high NO conversion rate up to 100% at 100-300 DEG C, and has good prospect in industrial application.