Preparation method of macroporous aluminum oxide with diplopore distribution

Abstract

A preparation method of a large-pore aluminum oxide with double-pore spread structure. First, aluminum oxide, a poreforming agent and solid silica are mixed, and receive ball-milling treatment in a ball milling machine; the mixture after treatment is kneaded into a plastic body by aqueous solution with cationic surfactant, extrusion aid, peptizator, etc. dissolved in, and put into the water vapor atmosphere to be treated; and the prepared mould is dried and baked, to obtain the final aluminum oxide carrier. The poreforming agent is one or the mixture of carbon black, cellulose and starch, and the loading is 3.0 to 15w percent of the weight of the aluminum oxide; the solid silica is silica aerogel, and the loading is 1.0 to 10w percent of the weight of the aluminum oxide; in the ball milling machine, the ball-material ratio is 15:1 to 10:1, and the ball milling time is 0.5 to 3.0h; the treatment temperature of the water vapor is 120 DEG C to 180 DEG C, and the treatment time is 0.5 to 6.0h. The aluminum oxide prepared by the invention has double-peak channel structure and high strength, and is applicable in fields of petrochemical, petroleum processing, environmental protection, etc.

Description

technical field

[0001] The invention belongs to the technical field of inorganic porous materials, and in particular relates to a preparation method of macroporous alumina with double-pore distribution. Background technique

[0002] Alumina is a very promising material. Based on its thermal, chemical and mechanical stability, oxidation resistance and low price, it is widely used as a catalytic material, such as acid catalyst, catalyst carrier, etc., as well as for adsorption and separation. and other fields. Alumina in practical application cannot be a powder material, and requires particles with a certain size (millimeter or submicron). The mesopores and macropores in these particles are conducive to the diffusion of reactants and products, and the carrier of multi-layered pores Materials will have higher efficiencies. In the field of catalyst application, the pore size and distribution of the alumina support have an important influence on the diffusion properties of the ...

Examples

Embodiment 1

[0023] Example 1: After ball milling 80g of pseudo-boehmite, 6.4g of carbon black powder, and 2.4g of white carbon black in a ball mill at a ball-to-material ratio of 15:1 for 2h, use cetyltrimethylammonium bromide containing 1.6 g. After the aqueous solution of 0.4g of methylcellulose is fully mixed, extrude it into strips with a diameter of 1.5mm on a screw extruder, treat it in a steam atmosphere at 120°C for 1h, and dry it in a muffle furnace Calcined at 800° C. for 3 h to obtain carrier A.

Embodiment 2

[0024] Embodiment 2: 80g of pseudo-boehmite, carbon black powder 10g, and white carbon black 4g were ball-milled for 4 hours at a ball-to-material ratio of 15:1 in a ball mill, and then treated with cetyltrimethylammonium bromide containing 2.8g, After the aqueous solution of 0.4g of methylcellulose is fully mixed, extrude it into strips with a diameter of 1.0mm on a screw extruder, treat it in a steam atmosphere at 180°C for 6h, and dry it in a muffle furnace at 800°C Lower calcined for 3h to obtain carrier B.

Embodiment 3

[0025] Embodiment 3: 80g of pseudo-boehmite, 8g of carbon black powder, and 2.4g of white carbon black were ball-milled for 2 hours at a ball-to-material ratio of 15:1 in a ball mill, and then treated with 4g of cetyltrimethylammonium bromide, After the aqueous solution of 0.4g of ethyl cellulose is fully mixed, extrude it into strips with a diameter of 1.2mm on a screw extruder, treat it in a steam atmosphere at 150°C for 3 hours, and dry it in a muffle furnace at 800°C Lower roasting for 3h to obtain carrier C.

technical field

[0001] The invention belongs to the technical field of inorganic porous materials, and in particular relates to a preparation method of macroporous alumina with double-pore distribution. Background technique

[0002] Alumina is a very promising material. Based on its thermal, chemical and mechanical stability, oxidation resistance and low price, it is widely used as a catalytic material, such as acid catalyst, catalyst carrier, etc., as well as for adsorption and separation. and other fields. Alumina in practical application cannot be a powder material, and requires particles with a certain size (millimeter or submicron). The mesopores and macropores in these particles are conducive to the diffusion of reactants and products, and the carrier of multi-layered pores Materials will have higher efficiencies. In the field of catalyst application, the pore size and distribution of the alumina support have an important influence on the diffusion properties of the ...

Examples

Embodiment 1

[0023] Example 1: After ball milling 80g of pseudo-boehmite, 6.4g of carbon black powder, and 2.4g of white carbon black in a ball mill at a ball-to-material ratio of 15:1 for 2h, use cetyltrimethylammonium bromide containing 1.6 g. After the aqueous solution of 0.4g of methylcellulose is fully mixed, extrude it into strips with a diameter of 1.5mm on a screw extruder, treat it in a steam atmosphere at 120°C for 1h, and dry it in a muffle furnace Calcined at 800° C. for 3 h to obtain carrier A.

Embodiment 2

[0024] Embodiment 2: 80g of pseudo-boehmite, carbon black powder 10g, and white carbon black 4g were ball-milled for 4 hours at a ball-to-material ratio of 15:1 in a ball mill, and then treated with cetyltrimethylammonium bromide containing 2.8g, After the aqueous solution of 0.4g of methylcellulose is fully mixed, extrude it into strips with a diameter of 1.0mm on a screw extruder, treat it in a steam atmosphere at 180°C for 6h, and dry it in a muffle furnace at 800°C Lower calcined for 3h to obtain carrier B.

Embodiment 3

[0025] Embodiment 3: 80g of pseudo-boehmite, 8g of carbon black powder, and 2.4g of white carbon black were ball-milled for 2 hours at a ball-to-material ratio of 15:1 in a ball mill, and then treated with 4g of cetyltrimethylammonium bromide, After the aqueous solution of 0.4g of ethyl cellulose is fully mixed, extrude it into strips with a diameter of 1.2mm on a screw extruder, treat it in a steam atmosphere at 150°C for 3 hours, and dry it in a muffle furnace at 800°C Lower roasting for 3h to obtain carrier C.