Catalyst for preparing low-carbon olefin by dehydrogenizing low-carbon alkane and preparation method of catalyst

A technology of low-carbon alkanes and low-carbon olefins, applied in the field of catalyst carriers and their preparation, can solve the problems of rapid decline in conversion rate, fast carbon deposition of catalysts, and short single-pass life.

Active Publication Date: 2017-05-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] One of the technical problems to be solved by the present invention is that the carbon deposition spe

Method used

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  • Catalyst for preparing low-carbon olefin by dehydrogenizing low-carbon alkane and preparation method of catalyst
  • Catalyst for preparing low-carbon olefin by dehydrogenizing low-carbon alkane and preparation method of catalyst
  • Catalyst for preparing low-carbon olefin by dehydrogenizing low-carbon alkane and preparation method of catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Get 142.52g magnesium nitrate (Mg(NO 3 ) 2 6H 2 O), 56.1g ammonium molybdate ((NH 4 ) 2 MoO 4 ) was dissolved in 1000ml of deionized water, and then 125.4g of silicon dioxide (80-120 microns in particle size) and 11.0g of germanium oxide (80-120 microns in particle size) were added to form a suspension; at 25°C, under vigorous stirring, the Slowly add 6% ammonia water dropwise into the mixed aqueous solution to form a precipitate, control the pH value to 8.0, stir for 2 hours, filter, wash with deionized water for 3 times, dry at 120°C, pulverize, and sieve at 700 ℃ for 16 hours to obtain a composite silica carrier. Pore ​​volume 0.56cm 3 / g, specific surface area 95m 2 / g. The composition and properties of the carrier are shown in Table 1.

[0028] 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 2O, 0.12g) i...

Embodiment 2

[0031] Get 231.5g magnesium nitrate (Mg(NO 3 ) 2 6H 2 O), 61.55g ammonium molybdate ((NH 4 ) 2 MoO 4 ) was dissolved in 1000ml of deionized water, and then 105.4g of silicon dioxide (76-110 microns in particle size) and 13.0g of germanium oxide (50-90 microns in particle size) were added to form a suspension; at 25°C, under vigorous stirring, the Slowly add 10% ammonia water dropwise into the mixed aqueous solution to form a precipitate, control the pH value to 8.0, stir for 2 hours, filter, wash with deionized water for 3 times, dry at 120°C, pulverize, and sieve at 760 ℃ for 12 hours to obtain a composite silica carrier. Pore ​​volume 0.68cm 3 / g, specific surface area 116m 2 / g. The composition and properties of the carrier are shown in Table 1.

[0032] 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, 0.12g)...

Embodiment 3

[0035] Get 83.98g magnesium nitrate (Mg(NO 3 ) 2 6H 2 O), 55.56g ammonium molybdate ((NH 4 ) 2 MoO 4 ) was dissolved in 1000ml of deionized water, and then 136.4g of silicon dioxide (30-80 microns in particle size) and 9.6g of germanium oxide (60-90 microns in particle size) were added to form a suspension; at 25°C, under vigorous stirring, the Slowly add 10% ammonia water dropwise into the mixed aqueous solution to form a precipitate, control the pH value to 8.0, stir for 2 hours, filter, wash with deionized water for 3 times, dry at 120°C, pulverize, and sieve at 760 ℃ for 12 hours to obtain a composite silica carrier. Pore ​​volume 0.70cm 3 / g, specific surface area 105m 2 / g. The composition and properties of the carrier are shown in Table 1.

[0036] 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, 0.12g) i...

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Abstract

The invention relates to a low-carbon alkane dehydrogenation catalyst and a preparation method thereof. The low-carbon alkane dehydrogenation catalyst and the preparation method thereof mainly aim at solving the problems that in existing preparation technologies, catalysts are high in carbon deposition speed, the conversion rate is dropped fast in the application process, and the single-pass service life is short. The preparation method comprises the steps that firstly, magnesium, molybdenum and metallic elements of the IV A family in a periodic table of elements are introduced into a silicon-containing carrier through a precipitation method, so that a compound metal oxidate carrier is obtained; then, a platinum component is loaded through an impregnation method, and in other words, the carrier is impregnated in an aqueous solution of soluble salt of platinum; and drying and roasting treatment are conducted, so that the platinum catalyst is obtained. Propane or iso-butane is adopted as a raw material; under the conditions that the reaction temperature ranges from 520 DEG C to 650 DEG C, the reaction pressure ranges from 0.1 MPa to 0.4 MPa, the alkane mass space velocity ranges from 0.1 h<-1> to 7.0 h<-1> and the volume ratio of H2O to CnH(2n+2) ranges from 0.5 to 18, the raw material is in contact with the catalyst; and propylene or isobutene is generated through a reaction. By means of the low-carbon alkane dehydrogenation catalyst and the preparation method thereof, the mentioned problems are well solved; and the low-carbon alkane dehydrogenation catalyst and the preparation method thereof can be applied to industrial preparation of the catalyst for preparing low-carbon olefin by dehydrogenizing the low-carbon alkane.

Description

technical field [0001] The invention relates to a catalyst carrier used for dehydrogenating low-carbon alkanes to produce low-carbon olefins and a preparation 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 ...

Claims

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Application Information

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IPC IPC(8): B01J32/00B01J23/28B01J23/652C07C11/06C07C11/09C07C5/333
CPCY02P20/52
Inventor 吴文海缪长喜刘剑锋姜冬宇樊志贵
Owner CHINA PETROLEUM & CHEM CORP
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