Catalyst in regular structure and its preparing method
A technology of regular structure and catalyst, applied in the field of catalyst and its preparation, can solve the problem of low selectivity of catalytic activity, and achieve the effects of high reaction activity, promotion of conversion and improvement of selectivity
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[0036] The preparation method of the catalyst of the present invention may also include drying and calcining the prepared active component layer catalyst with gradient distribution. The drying temperature is preferably 90-130°C, and the drying time is preferably 3-10 hours, more preferably the drying temperature is 110-120°C, and the drying time is 5-7 hours.
[0037] According to the present invention, the surfactant can also be loaded on the above-mentioned active component and / or carrier before coating. The surfactant is preferably a nonionic surfactant. The nonionic surfactant refers to a surfactant that does not generate ions in water and has active groups such as polyhydroxyl or polyoxyethylene in the molecule. The surface Active agents are relatively stable to acids and alkalis, mainly polyol type and polyoxyethylene type. The preferred nonionic surfactant is selected from one or more of polyethylene glycol, glycerol, carboxymethyl cellulose, polyvinyl alcohol or polyacrylic
Example Embodiment
[0041] Example 1
[0042] This example is used to illustrate the gradient structured catalyst provided by the present invention.
[0043] After stirring the pseudo-boehmite, ferric chloride, cerous chloride, and lanthanum chloride in deionized water, adjust the pH to 10.5 with sodium bicarbonate, stir for 110 minutes at a constant temperature of 80°C, and filter to wash until the moisture content is 70% by weight of the wet cake is ready for use.
[0044] The HZSM-5 molecular sieve (SiO 2 / Al 2 O 3 It is 100 and the content of sodium oxide is 0% by weight) is mixed with deionized water, stirred and homogenized at 80°C for 30 minutes to obtain a uniform slurry, and 70% by weight of the slurry is taken out. The remaining slurry was adjusted to pH=4 with citric acid, then mixed with the removed slurry and wet cake, and stirred at 80°C for 70 minutes, baked at 130°C for 4 hours, and calcined at 850°C for 6 hours to obtain the active composition Minute. The addition amount of HZSM-5 mol
Example Embodiment
[0046] Example 2
[0047] This example is used to illustrate the gradient structured catalyst provided by the present invention.
[0048] The structured catalyst was prepared according to the method of Example 1. The difference is that the carrier with structured structure is foamed alumina (200 / 0.33, cross-sectional pore density of 31 pores / cm², pore size) provided by Shanghai Taishan Refractory Material Factory. The cross-sectional area is 2.0 square millimeters), the high-pressure air to be purged is air with a pressure of 7 MPa and a flow rate of 20 liters / minute, and the purging time is 5 minutes. In the obtained gradient structured catalyst, the axial gradient formed by the active component layer on the carrier is 10 micrometers / cm, the thickness of the thickest active component coating is 190 micrometers, and the thickness of the thinnest active component coating is 30 micrometers .
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