Catalyst used for catalytic oxidation of formaldehyde and preparation method thereof
A catalytic oxidation and catalyst technology, which is applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve the problem of low reaction temperature, and achieve the effects of good performance repeatability, easy operation, and simple preparation method
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Embodiment 1
[0031] A catalyst used for the catalytic oxidation of formaldehyde is a core-shell structure, and the core is Co 3 o 4 , the shell is CeO 2 , the ratio of core to shell is calculated according to the mole percentage of Co and Ce metal atoms, as follows:
[0032] Co 97.60%
[0033] Ce 2.40%.
[0034] The preparation method of the catalyst used in the above-mentioned a kind of formaldehyde catalytic oxidation, promptly adopts co-current co-precipitation method at first to prepare Co 3 o 4 Catalyst particles, then in Co 3 o 4 Surface supported CeO on catalyst particles 2 Shell, its preparation process specifically comprises the following steps:
[0035] (1) Add 125 mL of Co(NO 3 ) 2 Solution I and 437.5mL Na with a concentration of 0.5mol / L 2 CO 3 Solution II is mixed according to the volume ratio of 1:3.5, and the volume of each drop is controlled to be 0.05–0.07mL. The resulting mixed solution is added dropwise to 30mL of Na 2 CO 3In the beaker of solution Ⅲ, cont...
Embodiment 1
[0045] Take the cobalt tetroxide powder obtained in step (1) of Example 1 as a control with a particle size of 200-250 mesh;
[0046] Mix 0.5 g of cobalt tetroxide powder with a particle size of 200-250 mesh obtained in Example 1 with an equal volume of quartz sand and fix it to the middle section of a reaction tube with an inner diameter of 6 mm in a micro-quartz tube fixed-bed reactor. N / min 2 After pretreatment at 200°C for 30 minutes under the atmosphere, then lower to room temperature, and then switch the reaction gas with a total flow rate of 50mL / min to carry out the catalytic reaction. In the reaction gas, the formaldehyde gas is 600ppm, the balance is air, formaldehyde gas By balance gas N 2 Bring it through a paraformaldehyde bubbler (water bath heated at 36°C). During the reaction process, the reaction temperature is controlled from 25°C, 50°C, 80°C, 100°C, 120°C, 150°C, 180°C, 200°C to 230°C. After each temperature point is reacted for 30 minutes, the reaction ta...
Embodiment 2
[0050] A catalyst used for the catalytic oxidation of formaldehyde is a core-shell structure, and the core is Co 3 o 4 , the shell is CeO 2 , the ratio of core to shell is calculated according to the mole percentage of Co and Ce metal atoms, as follows:
[0051] Co 95.55%
[0052] Ce 4.45%.
[0053] The preparation method of the catalyst used in the above-mentioned a kind of formaldehyde catalytic oxidation, promptly adopts co-current co-precipitation method at first to prepare Co 3 o 4 Catalyst particles, then in Co 3 o 4 Surface supported CeO on catalyst particles 2 Shell, its preparation process specifically comprises the following steps:
[0054] (1) Cobalt tetroxide powder with a particle size of 200-250 mesh, the specific process is the same as that in Example 1;
[0055] (2) Dissolve 1.439g of cerium nitrate hexahydrate salt in 50mL of water to obtain a cerium nitrate aqueous solution IV with a concentration of 0.066mol / L, add 5g of cobalt trioxide powder prepa...
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