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Preparation methods for macroporous alumina carrier and hydrodemetallization catalyst

A macroporous alumina, hydrodemetallization technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, catalyst carrier, etc. The problems of complex process and pore distribution and dispersion can achieve the effect of small amount of physical pore expander, simple process and low production cost.

Active Publication Date: 2012-05-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When purely using physical pore-enlarging agent to prepare alumina carrier, in order to achieve the ideal pore-enlarging effect, the amount of pore-enlarging agent is often large, and the carrier has the disadvantages of dispersed, non-concentrated pore distribution, and poor mechanical strength.
The pure use of chemical pore expanders will make the peptization of pseudo-boehmite worse, which will bring difficulties to the extrusion molding operation
In addition, when a large amount of chemical pore expander is used, the pore distribution of the carrier will be more diffuse.
Simultaneous use of physical pore-enlarging agent and chemical pore-enlarging agent can exert the synergistic effect of the two pore-enlarging agents, reduce their respective dosages, and overcome certain negative effects, but the preparation process is more complicated, and the addition of the two pore-enlarging agents is relatively It is difficult to achieve ideal matching. In addition, the concentration of the pore distribution of the carrier needs to be further improved

Method used

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  • Preparation methods for macroporous alumina carrier and hydrodemetallization catalyst
  • Preparation methods for macroporous alumina carrier and hydrodemetallization catalyst
  • Preparation methods for macroporous alumina carrier and hydrodemetallization catalyst

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0031] Weigh 200 g of pseudo-boehmite dry rubber powder (produced by Shenyang Catalyst Factory, alumina dry basis weight content 65%) and place it in an autoclave, add 200 ml of deionized water, seal the autoclave and place it in an oven for heating, and control the heating rate 10℃·min -1 After the temperature rose to 180°C, the temperature was maintained for 3 hours, and then naturally cooled to room temperature. After filtration, the filter cake was dried at 120°C for 1 hour. Pseudo-boehmite after drying and 3g concentration are the nitric acid of 65% by weight, 14g carbon black powder, 4g turnip powder and 150g deionized water mix uniformly, extrude into the clover-shaped bar of diameter 1.8mm on the screw extruder, Dry at 120° C. for 3 hours, and bake the dried molded product at 700° C. for 3 hours to obtain the alumina carrier B1 used in the catalyst provided by the present invention.

example 2

[0033] The same as Example 1, except that the pressurized hydrothermal treatment temperature was raised to 110° C. and then kept at constant temperature for 4 hours, and the amount of deionized water added was 40 ml to obtain the alumina carrier B2 used in the catalyst provided by the present invention.

example 3

[0035] Same as Example 1, except that the pressurized hydrothermal treatment temperature was raised to 300° C. and then the temperature was kept constant for 2 hours, and the amount of deionized water added was 300 ml to obtain the alumina carrier B3 used in the catalyst provided by the present invention.

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Abstract

The invention discloses preparation methods for a macroporous alumina carrier and a hydrodemetallization catalyst. The preparation method for the macroporous alumina carrier includes the following steps: (1) dry pseudoboehmite gel powder is hydrothermally processed under high pressure; (2) the dry pseudoboehmite gel powder obtained in step 1 is kneaded into a plastic, and pore-expanding agent is added in step 1 or step 2; (3) the plastic obtained in step 2 is shaped, the shaped material is dried and baked, and thereby the macroporous alumina carrier is obtained. The impregnation method is adopted to prepare the hydrodemetallization catalyst. The hydrodemetallization catalyst prepared by the method has large pore volume and pore diameter, centrally distributed pores, moderate mechanical strength and high activity and activity stability.

Description

technical field [0001] The invention relates to a preparation method of a macroporous alumina carrier and a hydrogenation demetallization catalyst. Background technique [0002] In recent years, the heavy and inferior quality of crude oil has become increasingly serious, especially the content of metal impurities such as nickel and vanadium in heavy and residual oil is increasing day by day. These elements are usually present in the raw materials in the form of organometallic compounds. During petroleum processing (residual oil hydrocracking, hydrodesulfurization, etc.), these metal-organic compounds will decompose, and metal elements will be deposited on the inner and outer surfaces of the catalyst. On the one hand, it may block the pores of the catalyst, resulting in Deactivation, on the other hand, will cause a rapid increase in bed pressure drop, causing frequent shutdown of the device and replacement of the catalyst. Therefore, in order to ensure the long-term normal ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J32/00B01J21/04B01J35/10B01J23/883C10G45/08
Inventor 季洪海沈智奇凌凤香王少军
Owner CHINA PETROLEUM & CHEM CORP
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