Composite manganese oxide catalyst for synchronously removing VOCs (Volatile Organic Compounds) and NOx in medium and low temperature flue gas as well as preparation method and application of composite manganese oxide catalyst

[0024] (1) Precursor gel configuration

[0025] According to the molar ratio of n(Fe):n(Mn)=1:2 in the final sample, weigh the iron nitrate (Fe(NO) 3 ) 3 ) was added to deionized water, dispersed with ultrasound and stirred at room temperature for 1 h until fully dissolved to form a precursor solution. Potassium permanganate (KMnO 4 ) was quickly added to the precursor solution with constant stirring to form a uniform and stable compound.

[0026] (2) High pressure crystallization

[0027] The obtained solution was transferred to a polytetrafluoroethylene liner, placed in a stainless steel reaction kettle, and left to stand at 120° C. and autogenous pressure for 24 hours to form crystals. After the reaction was completed, the reaction kettle was taken out and cooled at room temperature. The obtained crystalline product was repeatedly washed with deionized water, dried at 80°C overnight, and rolled and screened to obtain the synchronous VOCs and NOx used in medium and low temp

[0033] (1) Precursor gel configuration

[0034] According to the molar ratio of n(Cu):n(Mn)=1:2 in the final sample, weigh copper nitrate (Cu(NO) 3 ) 2 ) was added to deionized water, dispersed with ultrasound and stirred at room temperature for 1 h until fully dissolved to form a precursor solution. Potassium permanganate (KMnO 4 ) was quickly added to the precursor solution with constant stirring to form a uniform and stable compound.

[0035] (2) High pressure crystallization

[0036] The obtained solution was transferred into a polytetrafluoroethylene liner, placed in a stainless steel reaction kettle, and allowed to stand at 100° C. and autogenous pressure for 24 hours to form crystals. After the reaction was completed, the reaction kettle was taken out and cooled at room temperature. The obtained crystalline product was repeatedly washed with deionized water, dried at 90°C overnight, and rolled and screened to obtain the synchronous VOCs and NOx used in medium and low t

[0040] (1) Precursor gel configuration

[0041] According to the molar ratio of n(Co):n(Mn)=1:2 in the final sample, weigh cobalt nitrate (Co(NO) 3 ) 2 ) was added to deionized water, dispersed with ultrasound and stirred at room temperature for 1 h until fully dissolved to form a precursor solution. Potassium permanganate (KMnO 4 ) was quickly added to the precursor solution with constant stirring to form a uniform and stable compound.

[0042] (2) High pressure crystallization

[0043] The obtained solution was transferred into a polytetrafluoroethylene liner, placed in a stainless steel reaction kettle, and allowed to stand at 100° C. and autogenous pressure for 24 hours to form crystals. After the reaction was completed, the reaction kettle was taken out and cooled at room temperature. The obtained crystalline product was repeatedly washed with deionized water, dried at 90°C overnight, and rolled and screened to obtain the synchronous VOCs and NOx used in medium and low t