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Catalyst for producing low-carbon olefins by dehydrogenation of low-carbon alkanes and preparation method thereof

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

Active Publication Date: 2020-04-17
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 carbon deposition speed of the catalyst is fast, the conversion rate drops rapidly during use, and the single-pass life is short.

Method used

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  • Catalyst for producing low-carbon olefins by dehydrogenation of low-carbon alkanes and preparation method thereof
  • Catalyst for producing low-carbon olefins by dehydrogenation of low-carbon alkanes and preparation method thereof
  • Catalyst for producing low-carbon olefins by dehydrogenation of low-carbon alkanes and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Get 131.1g magnesium nitrate (Mg(NO 3 ) 2 6H 2 O), 165.4g zirconium nitrate (Zr(NO 3 ) 4 5H 2 O) Dissolve in 1000ml deionized water, then add 130.2g of silicon dioxide (80-115 microns in particle size) and 10.0g of germanium oxide (80-110 microns in particle size) to form a suspension; at 25°C, under vigorous stirring, 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, crush, sieve, and Calcined at 680°C for 18 hours to obtain a composite silica carrier. Pore ​​volume 0.62cm 3 / g, specific surface area 88m 2 / g. The composition and properties of the carrier are shown in Table 1.

[0027] 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) in aqueous so...

Embodiment 2

[0030] Get 248.1g magnesium nitrate (Mg(NO 3 ) 2 6H 2 O), 179.8g zirconium nitrate (Zr(NO 3 ) 4 5H 2 O) Dissolve in 1000ml deionized water, then add 103.6g of silicon dioxide (76-120 microns in particle size) and 14.8g of germanium oxide (50-100 microns in particle size) to form a suspension; at 25°C, under vigorous stirring, Slowly add 20% 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, crush, sieve, and Calcined at 780°C for 14 hours to obtain a composite silica carrier. Pore ​​volume 0.80cm 3 / g, specific surface area 115m 2 / g. The composition and properties of the carrier are shown in Table 1.

[0031] 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) in aqueous ...

Embodiment 3

[0034] Get 91.6g magnesium nitrate (Mg(NO 3 ) 2 6H 2 O), 182.3g zirconium nitrate (Zr(NO 3 ) 4 5H 2 O) Dissolve in 1000ml of deionized water, then add 123.2g of silicon dioxide (30-80 microns in particle size) and 19.6g of germanium oxide (50-90 microns in particle size) to form a suspension; at 25°C, under vigorous stirring, Slowly add 15% 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, crush, sieve, and Calcined at 700°C for 16 hours to obtain a composite silica carrier. Pore ​​volume 0.74cm 3 / g, specific surface area 109m 2 / g. The composition and properties of the carrier 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, 0.12g) in aqueous ...

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Abstract

The invention relates to a light alkane dehydrogenation catalyst carrier and an application thereof and mainly aims at solving the problems of high carbon deposition speed, high conversion ratio reduction speed in a use process and short one-way service life of the catalyst existing in the existing preparation technology. The problems are better solved by the technical scheme: firstly, introducingmagnesium, zirconium and IVA-group metal elements in a periodic table of elements to a silicon-containing carrier by using a precipitation method to obtain a composite metal oxide carrier; then, supporting a platinum metal component by using an impregnation method, namely impregnating a water solution of a soluble salt of platinum, and carrying out drying and roasting to obtain a platinum catalyst; and carrying out reaction by making propane / isobutene as a raw material contact with the catalyst under the conditions that the reaction temperature is 520-650 DEG C, the reaction pressure is 0.1-0.4MPa, the mass space velocity of alkane is 0.1-7.0h<-1> and the volume ratio of H2O / CnH2n+2 is 0.5-18 to produce propene / isobutylene. The light alkane dehydrogenation catalyst carrier can be appliedto industrial preparation of light olefins by light alkane dehydrogenation.

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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Patent Type & Authority Patents(China)
IPC IPC(8): B01J32/00B01J23/14B01J29/08B01J23/62B01J29/12C07C5/333C07C11/09C07C11/06
CPCY02P20/52
Inventor 吴文海樊志贵缪长喜姜冬宇
Owner CHINA PETROLEUM & CHEM CORP
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