Method of preparing formaldehyde by catalytic selection oxidation of ethylene
A technology of selective oxidation and catalytic oxidation, applied in the field of formaldehyde
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Embodiment 1
[0029] Weigh 0.50g of ammonium heptamolybdate and dissolve it completely in 30ml of deionized water, weigh 1.63g of mesoporous molecular sieve SBA-15 according to the proportion, add it to the above solution, stir at room temperature for 8h, stand for 10h, and steam in a 70℃ water bath until viscous paste, dried in a vacuum oven at 50°C for 20h, fully ground and then added to 1°C mlin -1 The heating rate was increased to 600 °C for 6 h, and 20wt% MoO was obtained. 3 / SBA-15 catalyst. The calcined solid powder is pressed into tablets, pulverized and sieved, and the solid particles of 30-60 meshes are taken as the catalyst for the catalytic selective oxidation reaction of ethylene.
[0030] The catalytic reaction was carried out in a fixed-bed reactor at atmospheric pressure (inner diameter of quartz reaction tube was 8 mm), and 0.20 g of 30-60 mesh 20wt% MoO was weighed 3 / SBA-15 catalyst was loaded into the reaction tube, at N 2 :O 2 =1:1, the total flow rate is 20ml min ...
Embodiment 2
[0034] The specific steps of catalyst preparation are the same as those in Example 1.
[0035] The catalytic reaction was carried out in a fixed-bed reactor at atmospheric pressure (inner diameter of quartz reaction tube was 8 mm), and 0.20 g of 30-60 mesh 20wt% MoO was weighed 3 / SBA-15 catalyst was loaded into the reaction tube. in N 2 :O 2 =1:1, the total flow rate is 20ml min -1The temperature was programmed to 600 °C for 30 min under the atmosphere, and the reaction was started after purging with nitrogen for 20 min. Reaction conditions: N 2 :O 2 :C 2 H 4 =8:1:1 (volume ratio), the total flow rate is 150ml min -1 , normal pressure, the reaction temperature is 590 ℃. The product was analyzed online by gas chromatography. The results of the catalytic reaction are listed in Table 2.
[0036] Table 2 20wt% MoO 3 Catalytic performance of / SBA-15 catalyst (T=590℃)
[0037] Conversion rate of ethylene (%) 47.3 Selectivity to formaldehyde (%) 61.2 ...
Embodiment 3
[0039] Weigh 0.09g of ammonium metavanadate and dissolve it completely in 30ml of deionized water, weigh 1.33g of mesoporous molecular sieve SBA-15 according to the proportion, add it to the above solution, stir at room temperature for 8h, stand for 10h, and steam in a water bath at 70°C until viscous paste, dried in a vacuum oven at 50°C for 20h, fully ground at 1°C min -1 The heating rate was increased to 600 °C for 6 h, and 5 wt% V was obtained. 2 O 5 / SBA-15 catalyst. The calcined solid powder is pressed into tablets, pulverized and sieved, and the solid particles of 30-60 meshes are taken as the catalyst for the catalytic selective oxidation reaction of ethylene.
[0040] The catalytic reaction was carried out in a fixed-bed reactor at atmospheric pressure (inner diameter of quartz reaction tube was 8 mm), and 0.20 g of 30-60 mesh 5wt% V was weighed. 2 O 5 / SBA-15 catalyst was loaded into the reaction tube. in N 2 :O 2 =1:1, the total flow rate is 20ml min -1 The ...
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