Method for adjusting properties of alumina carrier by selecting hydrated alumina with different grain size, carrier obtained by method and application
A kind of ethylene oxidation, solid technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, catalyst carrier, chemical instrument and method, etc., can solve the problem of low catalyst activity and selectivity
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[0065] The present invention will be further described below in conjunction with specific examples, but the scope of the present invention is not limited to these examples. For the convenience of expression, the particle size grades of trihydrate α-alumina are named as coarse particles, medium particles and fine particles, and the detailed specification requirements are shown in Table 1.
[0066] Table 1 Particle size specifications of trihydrate α-alumina
[0067]
preparation Embodiment 1
[0069] 3725g of coarse grained α-Al trihydrate 2 o 3 , 1095g fake Al monohydrate 2 o 3and 10 g BaSO 4 Put it in a mixer and mix well, then mix another part according to this raw material ratio, and then transfer both parts to the kneader. 160g NH 4 F is completely dissolved in 1.60 liters of dilute nitric acid solution (nitric acid: water = 1: 3, volume ratio) and then poured into a kneader and kneaded into a paste that can be extruded. Finally, put the paste into the extruder, extrude it into a column with an outer diameter of 8.0mm and a length of 6.0mm, and dry it at 80-120°C for more than 2 hours to reduce the free water content to 10% by weight the following.
[0070] Put the dried column into a natural gas kiln, raise it from room temperature to 1300 ° C over 19 hours, and then keep the temperature for 4 hours to obtain α-Al 2 o 3 The sample number is carrier 1, and the relevant physical performance data of the carrier are shown in Table 2.
preparation Embodiment 2
[0072] 3725g of granulated α-Al trihydrate 2 o 3 , 1095g fake Al monohydrate 2 o 3 and 10 g BaSO 4 Put it in a mixer and mix well, then mix another part according to this raw material ratio, and then transfer both parts to the kneader. 160g NH 4 F is completely dissolved in 1.70 liters of dilute nitric acid solution (nitric acid: water = 1: 3, volume ratio) and then poured into a kneader and kneaded into a paste that can be extruded. Finally, put the paste into the extruder, extrude it into a column with an outer diameter of 8.0mm and a length of 6.0mm, and dry it at 80-120°C for more than 2 hours to reduce the free water content to 10% by weight the following.
[0073] Put the dried column into a natural gas kiln, raise it from room temperature to 1300 ° C over 19 hours, and then keep the temperature for 4 hours to obtain α-Al 2 o 3 The sample number is carrier 2, and the relevant physical performance data of the carrier are shown in Table 2.
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