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Modified Al2O3 carrier and preparation method thereof

A carrier and modification technology, used in catalyst carriers, chemical instruments and methods, catalyst activation/preparation, etc., can solve the problems of catalyst activity and stability decline, easy loss, complex catalyst preparation methods, etc., to improve activity and selectivity properties, reducing surface acidity, high activity and stability

Inactive Publication Date: 2011-07-20
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation method of the catalyst is relatively complicated, and the potassium carbonate on the catalyst is easy to lose during the use of the catalyst, resulting in a decrease in the activity and stability of the catalyst

Method used

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  • Modified Al2O3 carrier and preparation method thereof
  • Modified Al2O3 carrier and preparation method thereof
  • Modified Al2O3 carrier and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Take by weighing the carrier A-1 in 10g comparative example 1, use 1.25g lanthanum nitrate La (NO 3 ) 3 ·6H 2 The solution made of O and 6-7g distilled water is impregnated with equal volume for 3 hours, dried at 110°C for 2 hours in a blast drying oven, then vacuum-dried at 150°C for 2 hours, and finally in a muffle furnace. Calcined at 1000°C for 2 hours in an air atmosphere to prepare a carrier La with a lanthanum content of 4wt%. 2 o 3 -Al 2 o 3 , the La that enters into the spinel compound accounts for 85wt%, which is recorded as carrier A-3. The structural formula of the spinel compound formed on the surface of the carrier is LaAlO 3 .

Embodiment 2

[0035] Take by weighing the carrier A-3 prepared in 10g embodiment 1, use 7.42g nickel nitrate Ni (NO 3 ) 2 ·6H 2 A solution made of O and 3-4g distilled water was impregnated in equal volume for 3 hours, dried at a constant temperature at 110°C for 2 hours in a blast drying oven, then dried at a constant temperature and vacuum at 150°C for 2 hours, and finally in a muffle furnace. The lanthanum-modified catalyst B-2 with a nickel loading of 15 wt% can be prepared by calcining at 300° C. for 2 hours in an air atmosphere.

Embodiment 3

[0037] Take by weighing the carrier A-1 in 10g comparative example 1, use 0.72g magnesium nitrate Mg (NO 3 ) 2 ·6H 2 The solution that O and 6-7g distilled water is made into carries out equal volume impregnation for 3 hours, carries out drying according to the drying condition among the embodiment 1, carries out 900 ℃ roasting of 4 hours under air atmosphere in the muffle furnace at last, prepares magnesium content 0.7wt% carrier MgO-Al 2 o 3 , the Mg entering into the spinel compound accounts for 92wt%, which is recorded as carrier A-4. The structural formula of the spinel compound formed on the surface of the carrier is MgAl 2 o 4 .

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Abstract

The invention relates to a modified Al2O3 carrier and a preparation method thereof. The invention first provides the modified Al2O3 carrier, Al2O3 is used as a matrix in the carrier, and the surface of the carrier is provided with a layer of spinel compound formed by modifying the Al2O3 with a modifying element M, wherein the modifying element M is one of La, Ce, Pr, Mg, Ca, Sr, Ba and Zn. The invention also provides the preparation method for the modified Al2O3 carrier. By selecting the proper modifying element for modifying the surface of the Al2O3 matrix, the modifying element and the Al2O3 form the spinel compound on the surface of the matrix, so the acidity of the carrier surface can be greatly reduced, the reaction between the active metal on the surface of the catalyst and the carrier is inhibited, the surface structure of the carrier is improved, and a catalyst obtained by using the surface modified carrier as a carrier can keep high activity and stability in long-time operation.

Description

technical field [0001] The invention relates to a modified Al 2 o 3 The carrier and its preparation method belong to the field of petroleum hydrogenation catalyst carrier. Background technique [0002] The carrier is an important part of the catalyst. For many industrial catalysts, after the active components are determined, the type and properties of the carrier often have a great impact on the performance of the catalyst. US Patent US4839329 discloses the use of TiO 2 As a supported catalyst, German patent DE2156544 discloses the use of SiO 2 As a carrier catalyst, Chinese patents CN1176291A and CN1356377A respectively disclose the use of CaCO 3 and magnesium aluminum spinel as the carrier catalyst. [0003] Activated alumina is one of the most important catalyst supports and is widely used in the field of petroleum processing catalysts. At present, a lot of research has been carried out on selective hydrogenation catalysts at home and abroad, and the catalysts with ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J32/00B01J23/10B01J21/10B01J23/02B01J23/06B01J35/10B01J37/02B01J37/08C10G45/04
Inventor 黄星亮吕红岩丁建军
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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