Alumina shaped body and its preparation method and application as well as catalyst and its preparation method and hydrotreatment method
A molding, alumina technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of difficult transfer, molding interference, high water content, etc. Achieve the effect of improving the working environment, avoiding dust pollution, and simplifying the process
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[0044] According to the first aspect of the present invention, the present invention provides a method for preparing an alumina molded body, which includes the following steps: (1) molding a silicon-containing hydrated alumina composition to obtain a molded article;
[0045] Optionally, (2) drying the molded article obtained in step (1) to obtain a dried molded article;
[0046] (3) In the presence of water vapor, the molded product obtained in step (1) or the dried molded product obtained in step (2) is fired in an oxygen-containing atmosphere.
[0047] In step (1), the silicon-containing hydrated alumina composition contains hydrated alumina, a compound having at least two proton acceptor sites, and a silicon-containing compound.
[0048] The hydrated alumina may be one or two or more selected from alumina trihydrate and alumina monohydrate. The hydrated alumina preferably contains alumina monohydrate, more preferably alumina monohydrate. Specific examples of the hydrated alumina m...
Embodiment 1
[0176] 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 water glass is added during the aging process , The silicon-containing pseudo-boehmite wet cake prepared after washing with a belt filter (the wet cake is numbered SLB-1), the i value of the wet cake is determined to be 77.8%, and the SiO 2 The calculated silicon content is 10% by weight.
[0177] (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 silicon-containing hydrated alumina composition of the present invention, and its property par...
Embodiment 2
[0183] (1) Mix 4kg of wet filter cake numbered SLB-1 with 400g deionized water for 1 minute, and then send the obtained slurry into the plate and frame filter press, adjust the pressure of the plate and frame to 0.7MPa and maintain In 15 minutes, a wet cake (coded as LB-1) was obtained. It was determined that the i value of the wet cake numbered LB-1 was 63%.
[0184] (2) Put 600g of the wet cake numbered LB-1 in a beaker, add 9g of hydroxyethyl methylcellulose (purchased from Shanghai Huiguang Fine Chemical Co., Ltd., the same below) and 3g of Sesbania The content of mannan is 85% by weight, purchased from Beijing Chemical Reagent Company). After stirring with a mechanical stirrer for 10 minutes, the silicon-containing hydrated alumina composition of the present invention is obtained. The properties are listed in Table 1.
[0185] (3) The silicon-containing hydrated alumina composition prepared in step (2) is extruded on an F-26 type twin-screw extruder using a circular orifice p...
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Abstract
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