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Preparation of la Modified Alumina Support and Support and Catalyst for Dehydrogenation of Long-chain Alkanes

An alumina carrier, dehydrogenation catalyst technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, catalyst carriers, etc., can solve the problems of side reactions, surface area carbon, catalyst deactivation, etc. , to achieve the effect of large pore volume, high strength and low heap ratio

Active Publication Date: 2016-12-28
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

The dehydrogenation reaction process is often accompanied by side reactions due to the presence of strong acid sites in the catalyst, resulting in carbon deposition on the surface, thereby deactivating the catalyst

Method used

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  • Preparation of la Modified Alumina Support and Support and Catalyst for Dehydrogenation of Long-chain Alkanes
  • Preparation of la Modified Alumina Support and Support and Catalyst for Dehydrogenation of Long-chain Alkanes
  • Preparation of la Modified Alumina Support and Support and Catalyst for Dehydrogenation of Long-chain Alkanes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: the preparation of alumina carrier

[0020] Weigh 30g of aluminum foil with a purity equal to 99.9%, add 253.3g of 10% hydrochloric acid solution, dissolve it at 98°C, and obtain a transparent aluminum sol after filtration.

[0021] Take 50 g of the prepared aluminum sol, add urotropine solution containing 6.5 g of urotropine with a mass fraction of 40%, mix well, and drop into 90 ° C oil (mixture of C10-C13 alkanes) column to form The balls are aged for 4-5 hours at 140°C for 8 hours, then taken out, rinsed with deionized water, dried at 120°C for 4 hours, and calcined at 600°C for 8 hours to obtain a spherical alumina carrier. Weigh 30g of aluminum foil, add 253.3g of 10% hydrochloric acid solution, dissolve it at 90-100°C, and obtain a transparent aluminum sol after filtration.

Embodiment 2

[0022] Embodiment 2: Preparation of La modified alumina carrier

[0023] Take by weighing the aluminum sol 50g that prepares in the embodiment 1, add the massfraction containing urotropine 6.5g and be 40% urotropine solution, then add the lanthanum nitrate solution 1.18ml that lanthanum concentration is 0.1g / ml, mix After uniformity, then use a dropper to drop it into 90°C oil (C 10 -C 13 Mixture of alkanes) into a ball for 4-5 hours, aged at 140°C for 8 hours, then taken out, rinsed with deionized water, dried at 120°C for 4 hours, and calcined at 600°C for 8 hours to obtain a La-modified spherical alumina carrier.

Embodiment 3

[0024] Embodiment 3: Alumina is the catalyst preparation of carrier

[0025] Take by weighing 7.2 grams of the carrier prepared in Example 1 and place it in a vacuum impregnator, and simultaneously take platinum concentration as 1.8ml of chloroplatinic acid aqueous solution of 0.02g / ml, 0.82ml of concentrated hydrochloric acid, 0.06g / ml of phosphite chloride containing tin 1.8ml of tin aqueous solution and 0.72ml of potassium chloride aqueous solution with a potassium concentration of 0.04g / ml. Add the above impregnating solution into a vacuum impregnator equipped with a carrier, dry it at 120°C for 2 hours after uniform impregnation, roast it in a muffle furnace at 520°C for 4 hours, and reduce it with pure hydrogen (purity>99.9%) with a water content of less than 20ppm at 470°C 2h, the catalyst C1 was obtained. The composition of the obtained catalyst is: platinum: 0.5%, tin 1.5%, potassium 0.40% (to the carrier weight).

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Abstract

The invention discloses a method for preparing a La-modified alumina carrier for a long-chain alkane dehydrogenation catalyst, which belongs to the fields of industrial catalysis and petrochemical industry. The lanthanum-modified alumina carrier prepared by the present invention has low bulk ratio, large pore volume, suitable surface area, and high strength, and meets the requirements of long-chain alkane dehydrogenation catalyst carrier; the prepared La-modified alumina carrier is vacuum impregnated with Pt . ‑1 , Hydrocarbon volume ratio of 200:1 under the condition of C 10 -C 13 The dehydrogenation reaction, reactivity and stability are significantly better than the catalyst prepared without La-modified alumina.

Description

technical field [0001] The invention relates to a method for preparing a La-modified alumina carrier for a long-chain alkane dehydrogenation catalyst. This carrier is mainly used in the production of medium and long chain alkanes (C 10 -C 13 ) Preparation of linear monoolefin catalysts by dehydrogenation. Background technique [0002] Alkylbenzene is the main raw material for the production of anionic surfactant alkylbenzene sulfonate. In the synthetic detergent industry, linear alkylbenzene is the main source of surfactant raw materials because it is harmless to human body and environmentally safe. In terms of production technology, the dehydrogenation-alkylation process accounts for more than 70% of the global alkylbenzene production, and it is also the main development direction of the production of synthetic detergent raw materials in my country. The key to this technical route is the dehydrogenation of long-chain alkanes to produce straight-chain monoolefins, and th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J32/00B01J23/10B01J23/63C07C5/333C07C9/15
Inventor 孙承林李先如周波荣欣罗沙李敬美何松波
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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