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Method for preparing aluminum oxide with bimodal pore distribution

A technology of alumina and bimodal pores, applied in chemical instruments and methods, catalyst activation/preparation, alumina/aluminum hydroxide, etc., can solve the problems of carrier affecting catalyst performance and low crushing strength, and achieve easy molding, Simple operation effect

Inactive Publication Date: 2010-05-12
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its crushing strength is low, and the carrier is easy to pulverize during application, which affects the performance of the catalyst.

Method used

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  • Method for preparing aluminum oxide with bimodal pore distribution
  • Method for preparing aluminum oxide with bimodal pore distribution
  • Method for preparing aluminum oxide with bimodal pore distribution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add 500 milliliters of water in the stirred kettle, make its temperature reach 55 ℃, then add concentration and be 0.3 liters of aluminum sulfate of 20%. Using the co-current feeding method, 1.5 liters of aluminum sulfate with a concentration of 20% and 1500 grams of sodium metaaluminate solution with a concentration of 200 grams of alumina / liter are neutralized, and the pH value is controlled at 7.5. During the reaction, cooling water was circulated through the jacket of the kettle to keep the solution temperature at 25°C. Aged for 4 hours, then washed 5 times with 20 liters of deionized water, and the obtained filter cake was dried at 150°C for 4 hours to obtain the raw material alumina hydrate A1

Embodiment 2

[0030] Add 500 milliliters of water into the stirred tank, control the reaction temperature to be 45°C, and control the pH value to be 6.5, adopt the co-current feeding method, 1 liter of nitric acid with a concentration of 20% and a sodium metaaluminate solution with a concentration of 150 grams of alumina / liter 2000g for neutralization, aged for 1 hour, and then washed 5 times with 20 liters of deionized water, and the obtained filter cake was dried at 120°C for 2 hours to obtain the raw material alumina hydrate A2

Embodiment 3

[0032] Control the reaction temperature to 75°C, control the pH value to 9.5, adopt the co-current feeding method, neutralize 1 liter of nitric acid with a concentration of 20% and 1000 grams of sodium metaaluminate solution with a concentration of 200 grams of alumina / liter, and age for 0.5 hours , and then washed 5 times with 20 liters of deionized water, and the obtained filter cake was dried at 120°C for 2 hours to obtain the raw material alumina hydrate B1

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Abstract

The invention relates to a method for preparing aluminum oxide with bimodal pore distribution, which comprises the following steps of: preparing two types of hydrated alumina raw materials under different process conditions; and then mixing, molding and calcinating the two hydrated alumina raw materials in a ratio of 1:0.5-4, wherein the calcination temperature is between 450 and 1,000 DEG C, and the calcination time is between 1 and 12 hours. The aluminum oxide provided by the invention has the bimodal pore distribution, has no pore-forming agent in the preparation process, has the pore diameter smaller than the pore volume of pores and not more than 5 percent of the total pore volume, and can be used as a catalyst and a carrier or an adsorbent thereof.

Description

technical field [0001] The invention relates to the technical field of catalysts and carriers. In particular, it relates to a method for the preparation of alumina having a bimodal pore distribution. Background technique [0002] Due to its complex properties, alumina can have different specific surface areas and pore structures according to different preparation methods, so it is suitable for some special occasions; at the same time, alumina has thermal, chemical, mechanical and other stability, and is cheap. It is a very widely used inorganic material, which can be used as catalyst and catalyst carrier, and is widely used in adsorption, separation and other fields. For catalysts, the pore distribution is mainly determined by the carrier that constitutes the catalyst, and in the field of catalysis, alumina is a common catalyst carrier, and its pore size and distribution are important to the diffusion properties of reactants in the catalyst particle during the catalytic pro...

Claims

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Application Information

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IPC IPC(8): C01F7/02B01J21/04B01J32/00B01J35/10B01J37/00
Inventor 杨玉旺于海斌刘红光刘敬利许岩戴清
Owner CHINA NAT OFFSHORE OIL CORP
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