A kind of catalyst and its process and device for purifying formaldehyde
A catalyst and process technology, applied in the field of gas purification, can solve the problems of secondary pollution catalyst activity, decline, etc., achieve the effect of non-toxic and harmless products, avoid secondary pollution, and improve the removal effect
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Embodiment 1
[0042] This embodiment provides a process for purifying formaldehyde, which includes the following steps: under a DC corona discharge environment with a discharge voltage of 15kV, the air with a formaldehyde content of 1000ppm passes through the catalytic reaction section at a gas flow rate of 300ml / min to obtain purified gas ;
[0043] Wherein, the catalytic reaction section is loaded with catalyst, and along the flow direction of the air, the packing thickness of the catalyst in the catalytic reaction section is 5.5 cm;
[0044] The preparation method of catalyst, comprises the steps:
[0045] 1) Set the specific surface area to 900m 2 / g, the average pore size is 2.3×10 -9 The activated carbon of m was first pickled with hydrochloric acid, then washed with deionized water, and finally dried at 105 °C;
[0046] 2) Put the carrier after step 1) in 0.45mol / L KMnO 4 Immerse in aqueous solution for 30h;
[0047] 3) After the carrier impregnated in step 2) is dried, in N 2 ...
Embodiment 2
[0050] This embodiment provides a process for purifying formaldehyde, comprising the following steps: under a DC corona discharge environment with a discharge voltage of 15kV, passing air with a formaldehyde content of 1000ppm through the catalytic reaction section at a gas flow rate of 300ml / min to obtain purified gas ;
[0051] Wherein, the catalytic reaction section is loaded with catalyst, and along the flow direction of the air, the packing thickness of the catalyst in the catalytic reaction section is 5.5 cm;
[0052] The preparation method of catalyst, comprises the steps:
[0053] 1) Set the specific surface area to 900m 2 / g, the average pore size is 2.3×10 -9 m of activated carbon in 0.45mol / L of KMnO 4 Immerse in aqueous solution for 30h;
[0054] 2) in N 2 Under atmosphere, the carrier impregnated in step 1) was calcined at 550° C. for 4.5 h to prepare the catalyst. According to XRD test, the catalyst contains MnO.
Embodiment 3
[0056] This embodiment provides a process for purifying formaldehyde, comprising the following steps: under a DC corona discharge environment with a discharge voltage of 20kV, passing air with a formaldehyde content of 1000ppm at a gas flow rate of 300ml / min through the catalytic reaction section to obtain purified gas ;
[0057] Wherein, the catalytic reaction section is loaded with catalyst, and along the flow direction of the air, the packing thickness of the catalyst in the catalytic reaction section is 8cm;
[0058] The preparation method of catalyst, comprises the steps:
[0059] 1) Wash the 4A molecular sieve with hydrochloric acid first, then with deionized water, and finally dry at 105°C;
[0060] 2) Put the carrier after step 1) in 0.04mol / L KMnO 4 Immerse in aqueous solution for 48h;
[0061] 3) After the carrier impregnated in step 2) is dried, in N 2 Under the atmosphere, it was microwaved at 800W for 4min;
[0062] 4) in N 2 Under the atmosphere, the carrie...
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Abstract
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