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Alumina carrier and preparation method thereof

A technology of alumina carrier and alumina, which is applied in the direction of catalyst carrier, chemical instrument and method, chemical/physical process, etc., can solve the problem of not being able to provide pore distribution, etc.

Active Publication Date: 2010-03-10
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The technical problem to be solved by the present invention is to provide a new pore distribution concentrated on 4-6nm alumina carrier and its preparation method in view of the defect that the prior art cannot provide the pore distribution concentrated on the 4-6nm alumina carrier

Method used

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  • Alumina carrier and preparation method thereof

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example 1

[0038] The slurry of hydrated alumina is obtained by the neutralization reaction of sodium metaaluminate and carbon dioxide gas.

[0039] The prepared high-concentration NaAlO containing 210g / L alumina and a caustic coefficient of 1.62 2 solution with deionized water to prepare Al 2 o 3 Transfer 5L of the solution with a concentration of 40±2g / L to a gelling reactor with a total volume of 8L. The reactor has an aspect ratio of 8 and a CO 2 gas distributor. Control the temperature of the solution at 25±5°C, and feed CO with a concentration of 90V% from the bottom of the reactor 2 gas for gelation reaction, the gelation temperature is controlled at 20-40°C, and the CO 2 The gas flow rate is 15±2L / min, and the pH value at the end of the reaction reaches 8.0-8.5 within 4-6 minutes. When the pH value of the process drops to the required range, stop the aeration and end the gelation reaction. The resulting slurry was filtered with a vacuum filter, and after the filtration was ...

example 2

[0041] The amorphous hydrated aluminum oxide used is the same as in Example 1, and the preparation method of the carrier is also the same as in Example 1, but the amount of glucose and acid added during extruding are different from Example 1, and the specific formula is shown in Table 1. Put the obtained wet carrier strip into an oven at 120°C to dry for more than 4 hours, then put it into a muffle furnace and bake it at 600°C for 4 hours, and the obtained sample is subjected to N 2 Adsorption analysis specific surface area, pore volume and pore size distribution are shown in Table 2.

example 3

[0043] The amorphous hydrated alumina used is the same as in Example 1, and the carrier preparation method is also the same as in Example 1, but the amount of acid and glucose added during extruding are different from Example 1. The specific formula is shown in Table 1. Put the obtained wet carrier strip into an oven at 120°C to dry for more than 4 hours, then put it into a muffle furnace and bake it at 600°C for 4 hours, and the obtained sample is subjected to N 2 Adsorption analysis specific surface area, pore volume and pore size distribution are shown in Table 2.

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Abstract

The invention relates to an alumina carrier and a preparation method thereof. The alumina carrier is characterized in that the specific surface area is between 250 and 380 m<2> / g and the pore volume is between 0.4 and 0.8 mL / g, and the pore volume of a hole with the pore diameter of 4 to 6 nanometers accounts for at least 50 percent of the total pore volume. The preparation method comprises the following steps: a) under a reaction condition of sufficiently depositing aluminum, depositing the aluminum in an aqueous solution containing an aluminum compound; b) separating, washing and drying thedeposit obtained in the step a) so as to obtain alumina hydrate; c) mixing the alumina hydrate obtained in the step b) with glucose, an acid and water, wherein the dosage of the glucose allows the weight ratio of the glucose to the alumina in the mixture to be between 5 and 35 percent, and the dosage of the acid allows the weight ratio of the acid to the alumina in the mixture to be between 0.5 and 3.5 percent; and d) drying and calcinating the mixture obtained in the step c) to obtain the alumina carrier. The alumina carrier can be used as a catalyst carrier for light fractions or other smallmolecule raw materials such as gasoline, naphtha and the like to take part in reactions.

Description

technical field [0001] The invention relates to an alumina carrier and a preparation method thereof. Background technique [0002] Alumina, especially γ-alumina, is often used as a carrier for the preparation of catalysts because of its good pore structure, specific surface area and thermal stability. Due to the different molecular sizes of the reactants, the catalysts most suitable for the reaction have different pore sizes. It is found that the pore distribution of the catalyst support for processing heavy distillate oil such as residual oil is advantageous to concentrate on 10-20nm, while the pore distribution of the catalyst support for processing light distillate oil is advantageous to concentrate on 4-10nm. For catalyst supports that participate in the reaction of light fractions such as gasoline and naphtha, or other small molecular chemical raw materials, if the pore distribution can be highly concentrated at 4-6nm, the active function of supporting metals can be be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J32/00B01J35/10B01J21/04
Inventor 曾双亲杨清河刘滨聂红李大东
Owner CHINA PETROLEUM & CHEM CORP
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