Low-carbon olefin platinum catalyst made through dehydrogenation of low-carbon alkane

A technology for low-carbon olefins and low-carbon alkanes, applied in the field of catalysts, can solve the problems of low catalyst activity and decreased selectivity, and achieve the effects of 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 regeneration by burning charcoal, and the selectivity gradually decreases during operation.

Method used

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  • Low-carbon olefin platinum catalyst made through dehydrogenation of low-carbon alkane
  • Low-carbon olefin platinum catalyst made through dehydrogenation of low-carbon alkane
  • Low-carbon olefin platinum catalyst made through dehydrogenation of low-carbon alkane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Get 807.14g ferric nitrate (Fe(NO 3 ) 3 9H 2 O), 247.62g zinc nitrate (Zn(NO 3 ) 2 6H 2 O), 48.29g nickel nitrate (Ni(NO 3 ) 2 6H2 O) Dissolve in 2000ml of deionized water; at 25°C, under vigorous stirring, slowly add 5% wt. ammonia water dropwise to the mixed aqueous solution, control the pH value to be about 7.5, and form a precipitate, leave the precipitate overnight at room temperature, filter , washed, dried at 120°C, crushed, sieved, and calcined at 700°C for 16 hours to obtain a composite zinc ferrite carrier. XRD characterization shows that the carrier has a spinel structure with a pore volume of 0.29cm 3 / g, specific surface area 76m 2 / g. The carrier composition and acidity are shown in Table 1.

[0033] 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 solution (10ml) of s...

Embodiment 2

[0036] Get 809.6g ferric nitrate (Fe(NO 3 ) 3 9H 2 O), 167.51g zinc nitrate (Zn(NO 3 ) 2 6H 2 O), 107.22g copper nitrate (Cu(NO 3 ) 2 3H 2 O) be dissolved in 2000ml deionized water; at 25 DEG C, under vigorous stirring, slowly add 10% ammoniacal liquor dropwise in this mixed aqueous solution, form precipitation, control pH value to be about 7.8, will precipitate at room temperature overnight, filter, Washing, drying at 100°C, crushing, sieving, and calcining at 750°C for 8 hours to obtain a composite zinc ferrite carrier. XRD characterization shows that the carrier has a spinel structure with a pore volume of 0.39cm 3 / g, specific surface area 86m 2 / g. The carrier composition and acidity are shown in Table 1.

[0037] 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 solution (10ml) of so...

Embodiment 3

[0040] Get 808.64g ferric nitrate (Fe(NO 3 ) 3 9H 2 O), 154.65g zinc nitrate (Zn(NO 3 ) 2 6H 2 O), 139.32g cobalt nitrate (Co(NO 3 ) 2 6H 2 O) be dissolved in 2000ml deionized water; at 26 DEG C, under vigorous stirring, 20% ammoniacal liquor is slowly added dropwise in this mixed aqueous solution, forms precipitation, controls pH value to be about 8.8, with precipitation overnight at room temperature, filter, Washing, drying at 100°C, crushing, sieving, and roasting at 750°C for 5 hours to obtain a composite zinc ferrite carrier. XRD characterization shows that the carrier has a spinel structure with a pore volume of 0.35cm 3 / g, specific surface area 55m 2 / g. The carrier composition and acidity are shown in Table 1.

[0041] 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 solution (10...

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Abstract

The invention relates to a low-carbon alkane dehydrogenation platinum catalyst and a preparation method thereof and mainly solves the problems that in an existing preparation technology, the catalyst conversion rate is low, and the selectivity is lowered in the use process. The preparation method includes the steps that firstly, a coprecipitation method is adopted, copper, nickel, manganese, cobalt and other transition metal elements are introduced into a zinc ferrite 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 steam treatment are conducted. Propane/ iso-butane are adopted 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 conducted, 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 preparation method thereof can be used for industrial preparation of low-carbon olefin catalysts made through dehydrogenation of low-carbon alkane.

Description

technical field [0001] The invention relates to a platinum catalyst used for dehydrogenating low-carbon alkanes to produce low-carbon olefins. 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 represented by the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89C07C11/06C07C11/09C07C5/333
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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