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Magnesium aluminate spinel carrier, and preparation method and application thereof

A magnesia-aluminum spinel and carrier technology, which is applied in the field of coal chemical industry, can solve the problem that the specific surface area of ​​the magnesia-aluminum spinel carrier decreases, affects the catalytic activity of the catalyst, and cannot solve the problem of the high specific surface area and high crystallinity of the magnesia-aluminum spinel carrier. and other problems, to achieve the effect of increasing the migration speed, good crystallinity, and reducing the crystallization temperature

Active Publication Date: 2015-04-15
FUZHOU UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the above technology, due to the high crystallization temperature of the magnesium aluminum spinel phase, the temperature must be raised to 700-900°C during the calcination process to ensure that the prepared magnesium aluminum spinel carrier has a good However, the higher the calcination temperature, the more serious the high-temperature sintering of the obtained magnesium-aluminum spinel carrier, so the calcination at a high temperature above 700°C in the above-mentioned technology will inevitably cause cause the sintering phenomenon of the magnesium aluminum spinel carrier, thereby causing the specific surface area of ​​the magnesium aluminum spinel carrier to decrease, thereby affecting the catalytic activity of the catalyst
It can be seen that the existing technology cannot solve the contradiction between the high specific surface area and high crystallinity of the magnesium aluminum spinel carrier

Method used

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  • Magnesium aluminate spinel carrier, and preparation method and application thereof
  • Magnesium aluminate spinel carrier, and preparation method and application thereof
  • Magnesium aluminate spinel carrier, and preparation method and application thereof

Examples

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Embodiment 1

[0034] The magnesium-aluminum spinel carrier described in this example is prepared from the following raw materials:

[0035] Al 2 o 3 , 102g;

[0036] Basic magnesium carbonate, 29g, the molecular formula of the basic magnesium carbonate used in the present embodiment is Mg 5 . (CO 3 ) 4 . (OH) 2 . 5(H 2 O); the basic magnesium carbonate and Al 2 o 3 The molar ratio is MgO / Al 2 o 3 counted as 0.3;

[0037] Silica powder, 0.013g; The particle size of described silica powder is 100 orders, and the consumption of described silica powder is 0.01wt% of raw material total amount;

[0038] Sesame powder, 0.65g; the amount of said Sessia powder is 0.5wt% of the total amount of raw materials.

[0039] The preparation method of magnesium aluminum spinel carrier described in the present embodiment is:

[0040] (1) The above-mentioned amount of basic magnesium carbonate and Al 2 o 3 Carry out kneading with acidic aqueous solution, described acidic aqueous solution i...

Embodiment 2

[0045] The magnesium-aluminum spinel carrier described in this example is prepared from the following raw materials:

[0046] al 2 o 3 ·H 2 O, 120g;

[0047] Light MgO, 60g; The light MgO and Al 2 o 3 ·H 2 The molar ratio of O is MgO / Al 2 o 3 counts as 1.5;

[0048] Silica powder, 35g; The particle size of described silica powder is 400 orders, and the consumption of described silica powder is 15wt% of raw material total amount;

[0049] Polyacrylamide, 18.7g; the amount of polyacrylamide is 8wt% of the total amount of raw materials.

[0050] The preparation method of magnesium aluminum spinel carrier described in the present embodiment is:

[0051] (1) Mix the light MgO and Al in the above amount 2 o 3 ·H 2 O is kneaded with an acidic aqueous solution, the acidic aqueous solution is citric acid, and the concentration of the citric acid is 3mol / L;

[0052] (2) Add the above-mentioned amount of silica powder and polyacrylamide to the kneaded mixture, knead evenly...

Embodiment 3

[0056] The magnesium-aluminum spinel carrier described in this example is prepared from the following raw materials:

[0057] al 2 o 3 ·3H 2 O, 156g;

[0058] Light MgO, 48g; The light MgO and Al 2 o 3 ·H 2 The molar ratio of O is MgO / Al 2 o 3 counts as 1.2;

[0059] Silica powder, 1.11g; The particle size of described silica powder is 500 orders, and the consumption of described silica powder is 0.5wt% of raw material total amount;

[0060] Glycerin, 17.8g; The consumption of described glycerin is 8wt% of raw material total amount.

[0061] The preparation method of magnesium aluminum spinel carrier described in the present embodiment is:

[0062] (1) Mix the light MgO and Al in the above amount 2 o 3 ·3H 2 O is kneaded with an acidic aqueous solution, the acidic aqueous solution is nitric acid, and the concentration of said nitric acid is 2mol / L;

[0063] (2) Add a specific amount of inorganic additives to the kneaded mixture or add the above-mentioned amount ...

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Abstract

The invention provides a magnesium aluminate spinel prepared by at least the following materials of an aluminum source and a magnesium source, wherein a molar ratio (MgO / Al2O3) of the aluminum source to the magnesium source is 0.3-1.5; and an inorganic additive which is one or more selected from phosphorus compounds, silicon compounds, boron compounds, wherein the amount of the inorganic additive accounts for 0.01-15 wt% of a total amount of raw materials. According to the invention, the migration velocity of Mg<2+> and Al<3+> in solid reactants during a roasting process is effectively increased by adding an inorganic additive, thereby significantly reducing the crystallization temperature of the magnesium aluminate spinel phase and effectively solving the problem of serious sintering and low specific surface area due to high-temperature roasting.

Description

technical field [0001] The invention relates to a magnesium-aluminum spinel carrier, a preparation method and application thereof, and belongs to the field of coal chemical industry. Background technique [0002] Magnesium aluminum spinel (MgAl 2 o 4 ) has high thermal stability, high mechanical strength and hardness, and has the advantages of good corrosion resistance, wear resistance and low thermal expansion coefficient. At the same time, due to the unique surface of magnesium aluminum spinel with both alkaline and acidic active centers properties, making it widely used as catalyst and catalyst carrier in chemical reactions. [0003] In the prior art, Chinese patent document CN1528658A discloses a carbon monoxide shift catalyst based on magnesium aluminum spinel carrier, the chemical composition of the catalyst is MoO 3 , 7-10wt%; CoO, 1-3.5wt%; the balance is magnesium aluminum spinel carrier. Wherein, the preparation method of the magnesia-aluminum spinel carrier is...

Claims

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Application Information

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IPC IPC(8): B01J32/00B01J21/14B01J35/10B01J23/882C01B3/16C10G45/08
CPCY02P20/52
Inventor 江莉龙魏可镁曹彦宁赵文涛刘彦芳谢红
Owner FUZHOU UNIVERSITY
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