Dehydrogenation catalyst, preparation method and application thereof, and method for preparing cyclohexanone by dehydrogenation of cyclohexanol
A technology of dehydrogenation catalyst and cyclohexanol, which is applied in the field of dehydrogenation of cyclohexanol to prepare cyclohexanone, which can solve the problems of low dehydrogenation temperature, unfavorable industrial application, and long time, and achieve the effect of high catalytic activity
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[0017] The invention provides a method for preparing a dehydrogenation catalyst, the method comprising: under co-precipitation conditions, contacting the soluble salt of the dehydrogenation active component with a precipitating agent capable of precipitating the cation of the soluble salt in water and then filtering to obtain The solid precipitate is dried or not dried before roasting; wherein, the contacting is carried out in the presence of an organic compound containing a functional group hydroxyl group, and the roasting temperature is 490-780°C.
[0018] In the present invention, the cation of the soluble salt refers to the cation of the active metal element in the active component, for example, if the active component is ZnO, then the cation of the soluble salt refers to the zinc ion (generally Zn 2+ ), similarly if the active component is Cu simple substance, then the cation of the soluble salt refers to Cu ion (generally Cu 2+ ). Regarding this, those skilled in the ar...
preparation Embodiment 1
[0037] Configuration 2L concentration is the mixed aqueous solution of barium nitrate, calcium nitrate and zinc nitrate (wherein the molar ratio of zinc element: calcium element: barium element is 5: 20: 1) that concentration is 30% by weight;
[0038] Add 6g of monoethanolamine to the aforementioned mixed aqueous solution to obtain a mixed aqueous solution containing alcoholamine;
[0039] At 70°C, the aforementioned mixed aqueous solution containing alkanolamine was contacted with an aqueous sodium carbonate solution with a concentration of 2 mol / L for 2 hours, wherein the amount of sodium carbonate was controlled so that barium ions, calcium ions and zinc ions were all precipitated, and then the precipitated The material was filtered out and washed (washed until no nitrate was detected, tested using FeSO4 solution and concentrated sulfuric acid, this test is called the nitrate ring test), and then roasted at 610°C for 5 hours to obtain C1.
preparation Embodiment 2-9
[0041] Prepare the dehydrogenation catalyst C2-C9 according to the method for Preparation Example 1, the difference is that in the preparation process, the temperature of active components, co-precipitation and calcination temperature etc. change to some extent (see Table 1 for details, wherein it is different from Preparation Example 1 The same conditions are not listed again).
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