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Preparation method of magnesium aluminate spinel for catalyst carrier

A magnesium-aluminum spinel and catalyst carrier technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve problems that are not safe and environmentally friendly, and are not suitable for large quantities Production and other problems, to achieve the effect of easy reaction, good application value and low temperature

Active Publication Date: 2016-06-08
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the preparation of magnesia-aluminum spinel is still mainly a tedious high-temperature process. There are many types of raw materials used in the preparation process, which is not safe and environmentally friendly, and is not suitable for mass production.

Method used

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  • Preparation method of magnesium aluminate spinel for catalyst carrier
  • Preparation method of magnesium aluminate spinel for catalyst carrier
  • Preparation method of magnesium aluminate spinel for catalyst carrier

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Prepare a 1:1 volume ratio water and ethanol mixed solution in a 200ml beaker, and heat it to 80°C in a water bath under continuous stirring. Weigh 18.02g magnesium nitrate (Mg(NO 3 ) 2 ·6H 2 O), 52.74g aluminum nitrate (Al(NO 3 ) 3 9H 2 O) or 33.94g aluminum chloride (AlCl 3 ·6H 2 O) and 88.625g citric acid (C 6 h 8 o 7 ·H 2 O) Dissolve in water and ethylene glycol mixed solution to make CA / Mg / Al 6:1:2 to obtain a light yellow transparent sol, and heat it in a water bath to make it a viscous dark red transparent gel. The gel was transferred to an evaporating dish while it was hot, and aged in an oven for 36 hours. Put the evaporating dish into a muffle furnace and ventilate it with air, roast at 450°C for 2 hours to remove citric acid, cool to room temperature and grind evenly, then put it into a muffle furnace and roast at 700°C for 12 hours to obtain a white magnesium aluminum spinel carrier.

Embodiment 2

[0035] Prepare a 1:1 volume ratio water and ethanol mixed solution in a 200ml beaker, and heat it to 80°C in a water bath under continuous stirring. Take by weighing 16.22g magnesium nitrate (Mg(NO 3 ) 2 ·6H 2 O), 47.47g aluminum nitrate (Al(NO 3 ) 3 9H 2 O) or 33.94g aluminum chloride (AlCl 3 ·6H 2 O) and 88.625g citric acid (C 6 h 8 o 7 ·H 2 O) Dissolve in water and ethylene glycol mixed solution to make CA / Mg / Al 6:0.9:2 to obtain a light yellow transparent sol, and heat it in a water bath to make it a viscous deep red transparent gel. The gel was transferred to an evaporating dish while it was hot, and aged in an oven for 36 hours. Put the evaporating dish into a muffle furnace and ventilate it with air, roast at 450°C for 2 hours to remove citric acid, cool to room temperature and grind evenly, then put it into a muffle furnace and roast at 700°C for 12 hours to obtain a white magnesium aluminum spinel carrier.

Embodiment 3

[0037] Prepare a 1:1 volume ratio water and ethanol mixed solution in a 200ml beaker, and heat it to 80°C in a water bath under continuous stirring. Weigh 18.02g magnesium nitrate (Mg(NO 3 ) 2 ·6H 2 O), 58.01g aluminum nitrate (Al(NO 3 ) 3 9H 2 O) or 37.33g aluminum chloride (AlCl 3 ·6H 2 O) and 88.625g citric acid (C 6 h 8 o 7 ·H 2 O) Dissolve in water and ethylene glycol mixed solution to make CA / Mg / Al 6:1:2.2 to obtain a light yellow transparent sol, and heat it in a water bath to make it a viscous dark red transparent gel. The gel was transferred to an evaporating dish while it was hot, and aged in an oven for 36 hours. Put the evaporating dish into a muffle furnace and ventilate it with air, roast at 450°C for 2 hours to remove citric acid, cool to room temperature and grind evenly, then put it into a muffle furnace and roast at 700°C for 12 hours to obtain a white magnesium aluminum spinel carrier.

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Abstract

The invention relates to a preparation method of magnesium aluminate spinel for a catalyst carrier; a sol-gel method is adopted for preparation, and the preparation method comprises the following steps: (1) under a condition of the temperature of 50-80 DEG C, mixing water and ethylene glycol together; (2) adding citric acid, a magnesium source and an aluminum source into the ethylene glycol aqueous solution with the molar ratio of citric acid (CA) to Mg to Al of 6 to (0.9-1) to (2-2.2); (3) heating the solution until the solution becomes a transparent red gel, and aging; and (4) at the temperature of 350-500 DEG C, roasting for 2-4 h, grinding, again roasting for 2-12 h at the temperature of 600-800 DEG C, and thus obtaining the magnesia alumina spinel carrier. The prepared magnesia alumina spinel product is mainly used for a carrier of a low-carbon alkane dehydrogenation reaction catalyst, is loaded with 0.01-0.5 wt.% of a platinum-family transition metal element, 0.01-1 wt.% of Sn, and has smaller size, higher specific surface, and suitable pore structure; and compared with a conventional dehydrogenation catalyst carrier, the carrier has the characteristics of high alkane conversion rate, good stability, and good monoolefine selectivity.

Description

technical field [0001] The invention belongs to the field of industrial catalysis, and in particular relates to a method for preparing magnesium-aluminum spinel as a catalyst carrier. The carrier is mainly used for C 2 -C 8 In the reaction of dehydrogenation of low-carbon alkanes to low-carbon olefins. Background technique [0002] At present, China's two major oil companies have 10-million-ton oil refineries, and the catalytic cracking of these 10-million-ton oil refineries produces a large amount of ethane, propane, and C4-C6 alkanes by-product. Therefore, how to rationally utilize these resources and maximize the economic efficiency of industrial processes is an important scientific research topic that needs to be solved urgently. The dehydrogenation of low-carbon alkanes to olefins is a feasible process route, that is, the catalytic dehydrogenation of ethane, propane and alkanes from C4 to C6 to produce olefins and hydrogen. The dehydrogenation of light alkanes to ole...

Claims

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Application Information

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IPC IPC(8): B01J21/10B01J23/62C07C5/333C07C11/02C07C11/06B82Y30/00B82Y40/00
CPCY02P20/52
Inventor 王冬娥田志坚徐竹生王琳王从新徐仁顺王炳春
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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