4results about How to "Improve low temperature denitrification performance" patented technology

The invention discloses an ultralow-temperature manganese-based SCR (Selective Catalytic Reduction) denitration catalyst and a preparation method thereof. The SCR catalyst comprises manganese oxide, zirconium oxide and tin oxide, in the catalyst finished product, the content of ZrO2 is 26-32 mol%, the content of SnO2 is 13-16 mol%, and the balance is MnO2 in terms of the total content of metal oxides being 100 mol%; by accurately controlling the contents of manganese oxide, zirconium oxide and tin oxide and the addition amount of cetyltrimethylammonium bromide (CTAB), the pore structure of the SCR catalyst is optimized, the activity and selectivity of the catalyst are improved, the performance of the catalyst is improved, and the catalyst can keep higher denitration efficiency under different working conditions; the conversion rate of the ultralow-temperature SCR catalyst to NO reaches 95% or above under the conditions that the reaction space velocity is 100,000 h <-1 > and the temperature is 80 DEG C, and the conversion rate is maintained at a high level for a long time.

The invention relates to the field of catalyst preparation, and discloses a modified manganese-based denitration catalyst and a preparation method thereof. The method comprises the following steps: mixing and grinding manganese salt and optional cerium salt, and roasting the obtained mixture to obtain the manganese-based catalyst, the method comprises the following steps: placing a manganese-based catalyst in a modified gas atmosphere for adsorption, then mixing the manganese-based catalyst with water, carrying out ultrasonic treatment, and then drying a separated solid product; wherein the modified gas contains the following components in percentage by volume: 3-8% of oxygen, 400-600 ppm of nitric oxide and 92-97% of inert gas. The modified manganese-based denitration catalyst has excellent low-temperature denitration performance, denitration catalysis is carried out at the temperature of 150 DEG C, and the NO conversion rate can reach 60% or above.

The present invention relates to the technical field of denitration catalyst preparation, and discloses a low-temperature denitration catalyst and a preparation method thereof and a flue gas denitration method. The method comprises the following steps: (1) mixing a main active component, a secondary active component, an auxiliary agent and water to obtain an active impregnation liquid; (2) impregnating the denitration catalyst in the active impregnation liquid, and drying to obtain a low-temperature denitration catalyst. The method uses a denitration catalyst as a carrier material, and adopts an impregnation method to load the main active component, the secondary active component and the auxiliary agent onto the carrier material, which can improve the low-temperature denitration performance of the catalyst and reduce SO 2 Oxidation rate.