Alkaline earth metal-containing hydrated alumina composition, molded body, preparation method and application, catalyst and preparation method
A hydrated alumina and alkaline earth metal technology, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve secondary dust pollution, transfer difficulties, difficult Stable control of the dry base of pseudo-boehmite to achieve the effect of reducing operating energy consumption and simplifying the process flow
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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 molded body formed from the composition according to this more preferred embodiment has 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%. -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 content of the alkal...
Embodiment 1
[0271] The hydrated alumina wet gel used in this example is a hydrated alumina gel solution prepared by the acid method (sodium metaaluminate-aluminum sulfate method, taken from Sinopec Changling Branch) and magnesium nitrate added during the aging process , The magnesium-containing pseudo-boehmite wet cake (the wet cake is numbered SLB-1) obtained after washing with a belt filter, the i value of the wet cake is determined to be 78%, and the MgO The calculated magnesium content is 6% by weight.
[0272] (1) Put 240g of the wet cake numbered SLB-1 in a beaker, and then add 6g of methylcellulose (purchased from Zhejiang Haishen Chemical Co., Ltd., the same below) and 3.6g of sesame powder (galactomannan poly The sugar content is 80% by weight, purchased from Beijing Chemical Reagent Company, the same below), after stirring with a mechanical stirrer for 10 minutes, the mixture obtained is the magnesium-containing hydrated alumina composition of the present invention, and its propert...
Embodiment 2
[0276] The aluminum oxide molded body was prepared by the same method as in Example 1. The difference is that in step (3), during the constant temperature period, the airflow 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 sent 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 support are listed in Table 2.
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