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Preparation method of macroporous alumina support

A macroporous alumina and carrier technology, applied in catalyst carriers, chemical instruments and methods, chemical/physical processes, etc., can solve the problems affecting the mechanical strength of macroporous alumina, poor compatibility of alumina dry rubber powder, and stem-shell powder. Uneven dispersion and other problems, to achieve the effects of low mechanical strength, low price, and reduced production costs

Active Publication Date: 2013-04-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the cost of the pore-enlarging agent used is relatively low, due to the poor compatibility between the stem-hull powder of the crops and the dry alumina powder, and the large amount used, the stem-hull powder is not uniformly dispersed in the plastic body during the kneading molding process, resulting in The distribution of macropores in the carrier is also uneven, which affects the mechanical strength of macroporous alumina

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 100 grams of pseudo-boehmite dry rubber powder, 5 grams of light furnace ash powder with a particle size of 20 μm, 5 grams of squash powder, and 120 ml of triethanolamine solution with a concentration of 2 wt%. After being fully kneaded into a plastic body, extrude into strips. After drying overnight at room temperature, it was dried at 110°C for 4 hours. The dried sample was placed in a high-temperature furnace, heated to 600°C at a rate of 5°C / hour, kept at this temperature for 6 hours, and cooled naturally to obtain a macroporous alumina carrier.

Embodiment 2

[0028] 100 grams of pseudo-boehmite dry rubber powder, 7 grams of light furnace ash powder with a particle size of 20 μm, 5 grams of squash powder, and 120 ml of triethanolamine solution with a concentration of 1.5 wt%. After being fully kneaded into a plastic body, extrude into strips. After drying overnight at room temperature, it was dried at 110°C for 4 hours. The dried sample was placed in a high-temperature furnace, heated to 650°C at a rate of 5°C / hour, kept at this temperature for 6 hours, and cooled naturally to obtain a macroporous alumina carrier.

Embodiment 3

[0030] 100 grams of pseudo-boehmite dry rubber powder, 40 μm of light furnace ash powder, 10 grams of usage, 5 grams of scallop powder, 125 ml of triethanolamine solution with a concentration of 1 wt%. After being kneaded into a plastic body, it is extruded into strips. After drying overnight at room temperature, it was dried at 110°C for 4 hours. The dried sample was placed in a high-temperature furnace, heated to 700°C at a rate of 10°C / hour, kept at this temperature for 5 hours, and cooled naturally to obtain a macroporous alumina carrier.

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Abstract

The invention discloses a preparation method of a macroporous alumina support. The method is characterized by taking light ash generated through combustion of crop stems and husks as a pore-enlarging agent, simultaneously adding a triethanolamine water solution and adopting a kneading method to prepare the macroporous alumina support. The method has the beneficial effects that the pore-enlarging agent is small in dosage, wide in source and low in cost, so the preparation cost of the alumina support can be effectively reduced; and the prepared macroporous alumina has the characteristics of double pore distribution, more concentrated pore distribution and higher mechanical strength, is used for preparing heavy / residual oil hydrogenation catalysts and is very favorable for delaying the increase of diffusion resistance in heavy / residual oil hydrogenation, thus being favorable for maintaining the apparent activities of the hydrogenation catalysts and lengthening the running period of the device.

Description

technical field [0001] The invention relates to a method for preparing a macroporous alumina carrier, in particular to a method for preparing a macroporous alumina carrier used as a catalyst for hydrogenation demetallization of heavy oil and residual oil. Background technique [0002] Hydrogenation catalysts supported by macroporous alumina have been widely used in the field of heavy oil hydrogenation. In order to reduce the diffusion resistance encountered by macromolecular reactions, so as to accommodate more carbon deposits, metal deposits, etc., the catalyst should have a larger pore size and pore volume. Since the large-diameter pores can act as channels and accommodate deposits, the inner surface of the catalyst can be used more effectively, and the activity and stability of the catalyst can be improved. Therefore, the catalyst made of a carrier with double pore size distribution with coexistence of large and small pore sizes has superior performance. The pore diamet...

Claims

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Application Information

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IPC IPC(8): B01J32/00B01J21/04B01J35/10
Inventor 杨卫亚沈智奇凌凤香王少军王丽华季洪海郭长友
Owner CHINA PETROLEUM & CHEM CORP
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