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A kind of preparation method of gamma-alumina carrier with high specific surface area

A high specific surface area, alumina carrier technology, applied in catalyst carriers, chemical instruments and methods, catalyst activation/preparation, etc., can solve the problems of bad, influence, and high calcination temperature, and achieve low calcination temperature, simple preparation process, no cost. easily destroyed effect

Active Publication Date: 2015-09-23
LIAONING KELONG FINE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the disclosed technology, there are many kinds of roasting methods, including: one-step roasting method, two-stage roasting method, three-stage roasting method, etc., but no matter which roasting method, the roasting temperature is relatively high
High temperature calcination will have adverse effects on the specific surface area, pore size and pore volume of γ-alumina

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0008] Preparation method of the present invention:

[0009] First, weigh a certain amount of pseudo-boehmite powder, physical pore-enlarging agent and extrusion aid, and add them to the kneader to mix evenly. During the mixing process, add the aqueous solution of peptizer evenly, and knead to the best plastic state. , and then extruded into clover-shaped strips (diameter 1mm), cut into small pieces of 1cm, dried naturally at room temperature, and then dried in a constant temperature blast drying oven at 100°C, and the dried molding was added to the rotary kiln After multi-stage constant temperature roasting, γ-alumina is finally produced.

[0010] The specific surface area of ​​the pseudo-boehmite powder described in the method of the present invention≧250m 2 / g, pore volume 0.7-0.9mL / g. The physical pore-enlarging agent is fumed white carbon black. The amount of the physical pore-enlarging agent added is 1% to 3% of the weight of the pseudo-boehmite powder, preferably...

Embodiment 1

[0015] Weigh pseudo-boehmite powder (specific surface area≧250m 2 / g, pore volume 0.7-0.9mL / g) 1000g, add 10g of meteorological silica, 10g of fennel powder and mix evenly, dissolve 3.3g of nitric acid and 6.7g in 10g of deionized water, and mix the obtained solution with the above materials Evenly, knead to the best plastic state, then extrude into 3mm clover-shaped strips on a hydraulic extruder, cut into 1cm pieces, dry at room temperature for 12h, and then dry at 100°C for 10h. The dried molded product was placed in a tubular rotary furnace, and fired at 170°C for 1h, 310°C for 1h, 360°C for 1h, and 550°C for 1h. The alumina carrier A1 provided by the present invention is obtained.

Embodiment 2

[0017] The same as in Example 1, except that the addition amount of fumed silica powder is 20 g, the addition amount of squash powder is 20 g, and other conditions remain unchanged, and the alumina carrier A2 provided by the present invention is obtained.

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Abstract

The invention discloses a preparation method of a gamma-alumina supporter with a high specific surface area. The gamma-alumina supporter is applicable to metal supported catalysts. According to the preparation method, pseudo-boehmite powder serves as a raw material and is roasted at low temperatures to prepare the gamma-alumina with the high specific surface area, wherein the specific surface area of the gamma-alumina is greater than or equal to 550m<2> / g; the specific surface area of the pseudo-boehmite powder is greater than or equal to 250m<2> / g; the roasting is multistage constant-temperature roasting and comprises the following stages: roasting for 0.5-2 hours at 150-200 DEG C, roasting for 0.5-2 hours at 300-350 DEG C, roasting for 0.5-2 hours at 360-410 DEG C, roasting for 0.5-2 hours at 500-550 DEG C; the highest roasting temperature in the low-temperature roasting is less than or equal to 550 DEG C. the multistage constant-temperature roasting process adopts the first three stages of roasting or four stages of roasting. The specific surface area of the gamma-alumina supporter is greater than or equal to 500<m>2 / g. Duo to the adoption of the multistage constant-temperature roasting method, the roasting temperature is low, so that the structure of the supporter is not easy to damage.

Description

technical field [0001] The invention relates to a method for preparing gamma-alumina used in petrochemical, chemical, environmental protection and other fields, in particular to a method for preparing a gamma-alumina carrier with a high specific surface area suitable for metal-loaded catalysts. Background technique [0002] Usually the preparation of γ-alumina is to use boehmite powder as raw material, add pore expander and extrusion aid and mix evenly, in the process of mixing, evenly add the aqueous solution of peptizer, knead to the best plastic state, and then Extrude, cut into strips, dry, roast, and finally produce γ-alumina. [0003] In the disclosed technology, there are many kinds of calcination methods, including: one-step calcination method, two-stage calcination method, three-stage calcination method, etc., but no matter what kind of calcination method, the calcination temperature is relatively high. High temperature calcination will have adverse effects on the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J32/00B01J21/04B01J35/10B01J37/08
Inventor 冉锋姜艳周全凯
Owner LIAONING KELONG FINE CHEM
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