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Low-carbon olefin catalyst prepared from low-carbon alkane through dehydrogenation and preparation method thereof

A technology for low-carbon alkanes and low-carbon olefins, applied in the field of catalysts and their preparation, can solve the problems of poor catalyst stability, easy crushing, insufficient mechanical strength of catalysts, etc., and achieve the effects of stable performance and good technical effects.

Active Publication Date: 2013-04-24
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 mechanical strength of the catalyst is not enough in the existing preparation technology, it is easy to be crushed, and the catalyst has poor stability. A new catalyst for the dehydrogenation of low-carbon alkanes to low-carbon olefins is provided.

Method used

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  • Low-carbon olefin catalyst prepared from low-carbon alkane through dehydrogenation and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Add 90g of pseudo-boehmite raw powder with an average particle size of 26μm or other inorganic oxygen-containing compounds of aluminum to 220.2g of the main raw material of pseudo-boehmite with an average particle size of 40μm, then add 9g of kale powder and then add 130ml After fully kneading with deionized water, extrude, place at room temperature for 12 hours, then hold at 90°C for 3 hours, and then dry at 120°C for 10 hours, and process at 750°C to obtain the carrier.

[0033] The composite alumina carrier obtained adopts the impregnation technology to load the active component, that is, the chloroplatinic acid (H 2 PtCl 6 6H 2 O, 2.23g), SnCl 4 ·5H 2 O, 7.4g; NaNO 3, 3.5g of mixed aqueous solution for 24 hours (metal platinum loading 0.4%), then dried at 60°C, calcined at 530°C in air flow for 3 hours, then treated with water vapor at 530°C for 4 hours, and finally passed dry air at 530°C Treat for 1 hour to obtain a catalyst sample, denoted as A. See Table ...

Embodiment 2

[0036] Add 98g of alumina component B pseudo-boehmite raw powder with a particle size of 16μm in 236g of pseudo-boehmite raw powder alumina component A main material with an average particle size of 32μm, and then add 12g of safflower powder and then add 140ml of deionized water was fully kneaded and extruded, left at room temperature for 12 hours, then kept at 90°C for 3 hours, then dried at 120°C for 10 hours, and treated at 750°C to obtain a carrier.

[0037] Catalyst is prepared according to the method of embodiment 1, the difference is that SnCl 4 ·5H 2 O, 11.0g; NaNO 3 , 7.4g; H 2 PtCl 6 6H 2 O, 4.6g, recorded as B. See Table 1 for the composition (%) and strength of the catalyst in terms of weight percent by element.

Embodiment 3

[0039] In 220g of alumina component A pseudo-boehmite raw powder main material whose average particle size is 40 μm, add 94 g of alumina component B pseudo-boehmite raw powder with an average particle size of 26 μm, then add 9 g of safflower powder and then add Add 130ml of deionized water, knead well, extrude, place at room temperature for 12 hours, then keep at 90°C for 3 hours, then dry at 120°C for 10 hours, and process at 750°C to obtain the carrier.

[0040] Prepare catalyst by the method for embodiment 1, SnCl 4 ·5H 2 O, 1.7g; NaNO 3 , 0.6g; H 2 PtCl 6 6H 2 O, 1.1g, denoted as C. See Table 1 for the composition (%) and strength of the catalyst in terms of weight percent by element.

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Abstract

The invention relates to a low-carbon olefin catalyst prepared from low-carbon alkane through dehydrogenation and a preparation method of the catalyst, and mainly solves the problem of low mechanical strength of the catalyst after a carrier is formed in the prior art. The technical scheme comprises the following that: a pseudo-boehmite raw powder or aluminum oxide raw powder is doped with pseudo-boehmite or aluminum oxide raw powder with smaller average particle size, a forming assistant such as Sesbania and the like is added, and a cylindrical carrier is obtained by kneading and squeezing; and a platinum-tin catalyst is obtained by loading the obtained carrier with a platinum component and a tin component by an impregnation method, namely, impregnating aqueous solutions of soluble salts of the platinum component and the tin component, and drying and roasting and processing with water vapour. According to the technical scheme, the problem of the low mechanical strength of the catalyst after the carrier is formed is solved well. The catalyst can be used for industrial production of preparing low-carbon olefin catalyst from low-carbon alkane through dehydrogenation.

Description

technical field [0001] The invention relates to a catalyst 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, propane catalytic dehydrogenation technology ...

Claims

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Application Information

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IPC IPC(8): B01J23/62C07C5/333C07C11/06C07C11/09
CPCY02P20/52
Inventor 吴文海吴省樊志贵马春景张磊缪长喜
Owner CHINA PETROLEUM & CHEM CORP
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