Alkaline earth metal-containing hydrated alumina composition and molded body, preparation method and application thereof, catalyst and preparation method thereof
A technology of hydrated alumina and alkaline earth metals, applied in the direction of metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve secondary dust pollution, transfer difficulties, and difficult Stably control the dry basis of pseudo-boehmite and other issues to achieve the effect of reducing operating energy consumption and simplifying the process
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[0123] According to the preparation method of the hydrated alumina composition of the present invention, in a more preferred embodiment, the compound having at least two proton acceptor sites contains galactomannan and cellulose ether. The shaped bodies formed from the composition according to this more preferred embodiment have higher strength. Further preferably, the compound having at least two proton acceptor sites is preferably galactomannan and cellulose ether.
[0124] In this more preferred embodiment, based on the total amount of the compound having at least two proton acceptor sites, the content of the galactomannan may be 10-70% by weight, preferably 15% by weight. -68% by weight, more preferably 20-65% by weight; the content of the cellulose ether may be 30-90% by weight, preferably 32-85% by weight, more preferably 35-80% by weight.
[0125] The content of the alkaline earth metal-containing compound in the raw material mixture can be selected according to the co...
Embodiment 1
[0271] The hydrated alumina wet gel used in this example is to add magnesium nitrate to the hydrated alumina gel solution prepared by the acid method (sodium metaaluminate-aluminum sulfate method, obtained from Sinopec Changling Branch) during the aging process , the magnesium-containing pseudo-boehmite wet filter cake (this wet filter cake is numbered as SLB-1) obtained after washing with a belt filter, after determination, the i value of this wet filter cake is 78%, expressed as MgO The calculated magnesium content is 6% by weight.
[0272] (1) Put 240g of wet filter cake numbered SLB-1 in a beaker, then add 6g of methyl cellulose (purchased from Zhejiang Haishen Chemical Co. The sugar content is 80% by weight, purchased from Beijing Chemical Reagent Company, the same below), and after being stirred by a mechanical stirrer for 10 minutes, the obtained mixture is the magnesium-containing alumina hydrate composition of the present invention, and its property parameters are lis...
Embodiment 2
[0276] Adopt the same method as Example 1 to prepare the alumina molded body, the difference is that in step (3), during the constant temperature period, the air flow output from the outlet of the tube furnace is not circulated into the tube furnace, but at the constant temperature During this period, air was supplied from the inlet of the tube furnace to the inner space of the tube furnace at 10 L / min. The property parameters of the prepared alumina supports are listed in Table 2.
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