Method for improving catalyst reacting activity in the propylene producing through propane dehydrogenation

A technology for propane dehydrogenation and reaction activity, which is applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc. Effect

Inactive Publication Date: 2008-03-12
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, this type of catalyst is still in the research stage, and there is no industrial application report

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0037] The preparation of the catalyst of the present invention can be carried out by methods such as chemical adsorption, chemical deposition, physical mixing, co-impregnation, and step-by-step impregnation. The step-by-step impregnation method is preferred, that is, first impregnating the formed catalyst carrier with a soluble solution of rare earth metal elements, and then co-impregnating with a soluble solution of platinum group metal elements and group IVA metal elements. Conventional impregnation, microwave impregnation and ultrasonic impregnation can be used for impregnation, and conventional impregnation is the best.

[0038] The composition of the above catalyst is: platinum group metal 0.01-10wt%, preferably 0.2-1.5wt%; group IVA metal 0.01-15wt%, preferably 0.5-5wt%; rare earth metal 0.01-10wt%, preferably 0.1-2wt%; Group element 0.01-10wt%, preferably 0.01-2wt%.

Embodiment 1

[0040] Add 15wt% Al in NaY molecular sieve (Na content is 1.0wt%) 2 o 3 Binder and 10wt% scallop powder, while adding 2wt% dilute HNO 3 Aqueous solution, mixed evenly and rolled into balls. The shape of the carrier is spherical with a diameter of 6mm, then dried at 80°C for 3h, and calcined in air at 550°C for 4h. The average compressive strength of the obtained catalyst carrier was 48N / piece. The calcined support was impregnated with La(NO 3 ) 3 The aqueous solution was filtered for 3 hours, washed with distilled water, dried at 80°C for 3 hours, and calcined in air at 500°C for 4 hours. Then at 80 °C, co-impregnated H 2 PtCl 6 and SnCl 4 The aqueous solution was filtered for 3 hours, washed with distilled water, dried at 80°C for 3 hours, activated in air at 500°C for 4 hours, and reduced in hydrogen at 500°C for 8 hours to obtain a catalyst. The loading amount of each component in the catalyst is: Pt: 0.4wt%, Sn: 0.8wt%, La: 1.0wt%.

[0041] Evaluation conditions...

Embodiment 2

[0044] Add 15wt% Al in NaZSM-5 molecular sieve Na content is 0.5wt% 2 o 3 Binder and 8wt% scallop powder, while adding 2wt% dilute HNO 3 Aqueous solution, rolling ball forming. The shape of the obtained carrier is spherical with a diameter of 8mm, then dried at 80°C for 3 hours, and calcined in air at 550°C for 4 hours. The average compressive strength of the catalyst carrier is 54N / piece. The calcined carrier is impregnated with Ce (NO 3 ) 3 The aqueous solution was filtered for 3 hours, washed with distilled water, dried at 80°C for 3 hours, and calcined in air at 500°C for 4 hours. Then at 80 °C, co-impregnated H 2 PtCl 6 and SnCl 4 The aqueous solution was suction filtered, washed with distilled water, dried at 80°C for 3h, dried at 80°C for 3h, calcined in air at 500°C for 4h, and reduced in hydrogen at 500°C for 8h to obtain the catalyst. The loading amount of each component in the catalyst is: Pt: 0.5wt%, Sn: 1.0wt%, Ce: 1.4wt%.

[0045] Evaluation conditions:...

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Abstract

A method to promote the activity of a catalyst for dehydrogenation of propane to propylene is as follows: (1) an inorganic oxide bonding agent, a promoter and an acid solvent are added into a heat-resistant oxide; then after the oxide bonding agent, the promoter, the acid solvent and the oxide are kneaded evenly, the oxide is molded by rolling or band-extruding; (2) the catalyst carrier prepared is dried for 2 to 10 hours under the temperature of 60 centigrade degrees, and calcined under the temperature of 400 to 800 degrees; (3) the calcined carrier is immersed in a rare earth metal water solution under the temperature of 60 to 100 centigrade degrees for 2 to 10 hours; (4) the catalyst carrier modified by the rare earth is immersed in a water solution comprising platinum metal elementsand the fourteenth metal elements under the temperature of 400 to 600 centigrade degrees for 2 to 10 hours, and then the carrier is filtered, washed with distilled water, dried under the temperature of 60 to 180 centigrade degrees for 2 to 10 hours, and calcined under the temperature of 400 to 600 centigrade degrees for 2 to 10 hours; (5) the catalyst prepared is activated in the air under the temperature of 400 to 600 centigrade degrees for 3 to 10 hours, and reduced in a hydrogen flow under the temperature of 400 to 600 centigrade degrees for 2 to 10 hours; the reduced catalyst is used for catalytic reaction for dehydrogenation of propane to propylene.

Description

technical field [0001] The invention relates to a catalyst for the catalytic reaction of propane dehydrogenation to propylene, in particular to a method for improving the catalyst reaction activity of propane dehydrogenation to propylene, which belongs to the catalyst preparation technology in the technical field of industrial catalysis. Background technique [0002] Propylene is one of the important olefin raw materials in the petrochemical industry, mainly used in the production of polypropylene, cumene, carbonyl alcohol, acrylonitrile, propylene oxide, acrylic acid, isopropanol, etc. With the continuous development of downstream products of propylene and its derivatives, the demand for propylene is increasing day by day, and the conventional steam cracking process, due to its own production technology constraints, limits the increase in propylene production. At present, countries are actively developing new technologies for increasing propylene production. Open up new sou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/10B01J29/46C07C11/06C07C5/333
CPCY02P20/52
Inventor 周钰明张一卫刘辉
Owner SOUTHEAST UNIV
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