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Low-carbon olefin catalyst made through dehydrogenation of low-carbon alkane and use method of low-carbon olefin catalyst

A technology of low-carbon olefins and low-carbon alkanes, applied in the field of catalysts, can solve problems such as low activity and decreased selectivity, and achieve uniform distribution and high dispersion

Active Publication Date: 2016-03-02
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] One of the technical problems to be solved by the present invention is that the activity of the existing catalyst is not high during high temperature use or after charcoal regeneration, and the selectivity gradually decreases during operation; a new low-temperature catalyst is provided. Carbon alkane dehydrogenation platinum catalyst carrier, the catalyst is used in the process of low-carbon alkane dehydrogenation to low-carbon olefins, and has the advantages of high catalyst conversion rate and stable selectivity under high temperature and charcoal regeneration conditions

Method used

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  • Low-carbon olefin catalyst made through dehydrogenation of low-carbon alkane and use method of low-carbon olefin catalyst
  • Low-carbon olefin catalyst made through dehydrogenation of low-carbon alkane and use method of low-carbon olefin catalyst
  • Low-carbon olefin catalyst made through dehydrogenation of low-carbon alkane and use method of low-carbon olefin catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Get 754.56g aluminum nitrate (Al(NO 3 ) 3 9H 2 O), 245.81g zinc nitrate (Zn(NO3 ) 2 6H 2 O), 48.44g nickel nitrate (Ni(NO 3 ) 2 6H 2 O) be dissolved in 2000ml of deionized water; at 25°C, under vigorous stirring, slowly add 15% ammonia by weight dropwise to the mixed aqueous solution to form a precipitate, control the pH value to 6.5, and filter the precipitate at room temperature overnight , washed, dried at 110°C, crushed, sieved, and calcined at 720°C for 18 hours to obtain a composite zinc aluminate carrier. XRD characterization (see figure 1 ) shows that the carrier has a typical spinel structure with a pore volume of 0.34cm 3 / g, specific surface area 86m 2 / g. The carrier composition and acidity are shown in Table 1.

[0035] The obtained carrier adopts impregnation technology to load the platinum component, that is, at room temperature, 15.0 g of the obtained carrier is impregnated with chloroplatinic acid (H 2 PtCl 6 6H 2 O, 0.16g) and an aqueous ...

Embodiment 2

[0038] Get 755.30g aluminum nitrate (Al(NO 3 ) 3 9H 2 O), 167.51g zinc nitrate (Zn(NO 3 ) 2 6H 2 O), 108.10g copper nitrate (Cu(NO 3 ) 2 6H 2 O) be dissolved in 2000ml deionized water; at 20 DEG C, under vigorous stirring, the ammoniacal liquor of 16%wt. is slowly added dropwise in this mixed aqueous solution, forms precipitation, and the pH value of control is 7.5, and after precipitation overnight at room temperature, Filter, wash, dry at 100°C, pulverize, sieve, and bake at 700°C for 10 hours to obtain a composite zinc aluminate carrier. XRD characterization shows that the carrier has a typical spinel structure with a pore volume of 0.32cm 3 / g, specific surface area 80m 2 / g. The carrier composition and acidity are shown in Table 1.

[0039] The obtained carrier adopts impregnation technology to load the platinum component, that is, at room temperature, 15.0 g of the obtained carrier is impregnated with chloroplatinic acid (H 2 PtCl 6 6H 2 O, 0.16g) and an aq...

Embodiment 3

[0042] Get 753.33g aluminum nitrate (Al(NO 3 ) 3 9H 2 O), 154.65g zinc nitrate (Zn(NO 3 ) 2 6H 2 O), 139.69g cobalt nitrate (Co(NO 3 ) 2 6H 2 O) be dissolved in 2000ml deionized water; at 20 DEG C, under vigorous stirring, the ammoniacal liquor of 20%wt. is slowly added dropwise in this mixed aqueous solution, forms precipitation, and the pH value of control is 7.4, and after precipitation overnight at room temperature, Filter, wash, dry at 100°C, pulverize, sieve, and bake at 750°C for 5 hours to obtain a composite zinc aluminate carrier. XRD characterization shows that the carrier has a typical spinel structure with a pore volume of 0.35cm 3 / g, specific surface area 51m 2 / g. The carrier composition and acidity are shown in Table 1.

[0043] The obtained carrier adopts impregnation technology to load the platinum component, that is, at room temperature, 15.0 g of the obtained carrier is impregnated with chloroplatinic acid (H 2 PtCl 6 6H 2 O, 0.16g) and an aqu...

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Abstract

The invention relates to a low-carbon alkane dehydrogenation platinum catalyst and a use method thereof and mainly solves the problems that in an existing preparation method, the catalyst conversion rate is low, and the selectivity is lowered in the use process. According to the low-carbon alkane dehydrogenation platinum catalyst and the use method thereof, firstly, a coprecipitation method is adopted for introducing copper, nickel, manganese, cobalt and other transition metal elements into a zinc aluminate carrier, and a composite metal oxide carrier is obtained; then an impregnation method is adopted, platinum components are loaded, in other words, a water solution of soluble salt of platinum is dipped, and the platinum catalyst is obtained after drying, baking and stream treatment. Propane / iso-butane serve as raw materials, the raw materials are in contact with the catalyst in the conditions that the reaction temperature is 520-620 DEG C, the reaction pressure is 0-0.4 MPa, the alkane mass airspeed is 0.1-8.0 h<-1>, the H<2>O / C<n>H<2n+2> volume ratio is 1-18, a reaction is condnucted, and propane / iso-butane are generated, by means of the technical scheme, the problem is well solved, and the low-carbon alkane dehydrogenation platinum catalyst and the use method thereof can be used for industrial application of low-carbon olefin catalysts made through dehydrogenation of low-carbon alkane.

Description

technical field [0001] The invention relates to a catalyst used for dehydrogenating low-carbon alkanes to produce low-carbon olefins and a use method thereof. Background technique [0002] Propylene / isobutylene mainly comes from the co-production or by-product of steam cracking and fluid catalytic cracking in refineries, and can be widely used in the synthesis of polymers, gasoline additives, rubber and various chemical intermediates. With the increasing demand for low-carbon olefins, the traditional production process is difficult to meet the rapid growth of market demand. A large amount of low-carbon alkanes obtained from refineries are the main components of liquefied petroleum gas, which are mainly used as civil fuels. The development of the process of producing low-carbon alkenes from low-carbon alkanes is of great significance for making full use of low-carbon alkanes to open up new sources of alkenes. At present, the alkane catalytic dehydrogenation technology is re...

Claims

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Application Information

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IPC IPC(8): B01J23/89B01J23/656B01J23/652B01J23/62B01J23/60C07C11/06C07C11/09C07C5/333
CPCY02P20/52
Inventor 吴文海缪长喜樊志贵曾铁强姜冬宇
Owner CHINA PETROLEUM & CHEM CORP
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