Catalyst for preparing low-carbon olefin through one-step conversion of synthesis gas and preparing method and application thereof

A technology of low-carbon olefins and catalysts, which is applied in the field of catalysts and preparations for one-step conversion of synthesis gas to low-carbon olefins, which can solve the problems of low olefin selectivity and poor product distribution, and achieve low selectivity, good dispersion, and improved selectivity sexual effect

Active Publication Date: 2016-08-17
NINGXIA UNIVERSITY
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  • Claims
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Problems solved by technology

[0004] The purpose of the present invention is to provide a catalyst for producing low-carbon olefins by one-step conversion of synthesis gas and its preparation method and application, aiming to solve the problems caused by the dispersion uniformity of active components and strong interaction between metals in the existing catalytic system Problems with poor product distribution and low olefin selectivity

Method used

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  • Catalyst for preparing low-carbon olefin through one-step conversion of synthesis gas and preparing method and application thereof

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preparation example Construction

[0027] Such as figure 1 As shown, the preparation method of the catalyst for the one-step conversion of synthesis gas to low-carbon olefins in the embodiment of the present invention comprises the following steps:

[0028] S101: Weigh 30.0~80.0g Fe(NO 3 ) 3 •9H 2 O, prepared into a solution with a concentration of 0.2~3mol / L;

[0029] S102: Use urea as precipitant, urea:iron molar ratio is (3~4):1, mix with the solution obtained in S101 and carry out microwave hydrothermal precipitation, precipitation conditions: microwave power 200~600W, time 1~3h, temperature 130 ~180 o C, the obtained precipitate was filtered, washed, and ultrasonically dispersed in absolute ethanol, and the obtained precipitate was recorded as A;

[0030] S103: Use ammonia water as precipitant, NH 4 OH: iron molar ratio is (3~5): 1, mixed with the solution obtained from S101 to precipitate; precipitation conditions: precipitation temperature 20 ~ 40 o C, the stirring time is 2~3h, the pH value is 10...

Embodiment 1

[0039] Weigh Fe(NO 3 ) 3 •9H 2 O 75.90g and urea 33.85g were prepared into a 120 mL solution with deionized water. Transfer the above solution into the sample dissolving cup of TFM material, under microwave pressure 1.6MPa, power 500W, 170 o C was heated for 2h. Centrifuge and wash the above precipitated solution to neutrality, add 60 mL of absolute ethanol and centrifuge twice, pour off the supernatant and add 70 mL of absolute ethanol for ultrasonication for 0.5 h, and then separate the supernatant to obtain the iron precursor. Weigh ZrO 2 (NO 3 ) 2 • 2H 2 O 4.40g, urea 2.00g, add 80mL deionized water and stir to dissolve, mix the solution with the aforementioned iron precursor and put it into a high-pressure reactor, use a homogeneous reactor for dynamic precipitation, the speed is 5r / min, 160 o C kept for 3h. Centrifugal washing after reaction, 100 o C drying 10h, at 550 o After roasting C for 3 hours, grind it evenly to obtain a dry powder. Take 4.00g of the a...

Embodiment 2

[0041] Weigh Fe(NO 3 ) 3 •9H 2 O50.60g and urea 22.57g were prepared into 80 mL solution with deionized water. Transfer the above solution into the sample dissolving cup of TFM material, under microwave pressure 1.6MPa, power 400W, 160 o C heated for 3h. Centrifuge and wash the above precipitate until neutral, add 60 mL of absolute ethanol and centrifuge twice, pour off the supernatant and add 50 mL of absolute ethanol for ultrasonication for 0.5 h, then separate the supernatant to obtain the iron precursor. Weigh ZrO 2 (NO 3 ) 2 • 2H 2 O 5.58g, urea 2.50g, add 95mL deionized water and stir to dissolve, mix the solution with the aforementioned iron precursor and put it into a high-pressure reactor, use a homogeneous reactor to carry out dynamic precipitation, rotating speed 5r / min, 170 o C kept for 3h. Centrifugal wash after reaction, 120 o C drying 12h, at 500 o After roasting C for 3 hours, grind it evenly to obtain a dry powder. Take 4.00g of the above dry powde...

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Abstract

The invention discloses a catalyst for preparing low-carbon olefin through one-step conversion of synthesis gas and a preparing method and application thereof. The catalyst comprises Fe, Zr or Mn, K and oxides thereof and is prepared in the way that urea serves as the precipitant and is mixed with a solution, then microwave hydrothermal precipitation is conducted, and filtration, washing and absolute ethyl alcohol ultrasonic dispersion are conducted to obtain precipitate A; or ammonium hydroxide serves as the precipitant and is mixed with a solution, then precipitation is conducted, and filtration, washing and absolute ethyl alcohol ultrasonic dispersion are conducted to obtain precipitate B; urea serving as the precipitant and the obtained A are mixed and stirred and then subjected to dynamic hydrothermal precipitation; ammonium hydroxide serving as the precipitant and the obtained B are mixed and stirred and then subjected to dynamic precipitation; the obtained precipitate is separated, filtered, washed and dried to obtain powder; a potassium carbonate solution is prepared to serve as impregnation liquid to impregnate the powder, and drying, grinding, tabletting and pelleting are conducted to obtain the catalyst. Olefin selectivity is effectively improved, and product distribution is improved; furthermore, raw materials are cheap and easy to obtain, and particle size is controllable.

Description

technical field [0001] The invention belongs to the technical fields of energy and chemical industry, and in particular relates to a catalyst for producing low-carbon olefins by one-step conversion of synthesis gas, a preparation method and application thereof. Background technique [0002] Low-carbon olefins (ethylene, propylene, and butene) are important basic organic chemical raw materials, often used in the production of organic compounds such as polyethylene, polypropylene, acrylonitrile, ethylene oxide, or ethylene glycol. Occupy a very important position, the demand is increasing day by day. At present, light olefins mainly come from the petrochemical route of cracking naphtha or light oil and the non-petroleum route of methanol to olefins (MTP / MTO) process. As a country rich in coal, low in oil, and short of gas, my country has important strategic significance and application prospects in developing and utilizing coal resource technology to efficiently produce low-c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/78B01J23/889C07C1/04C07C11/04C07C11/06C07C11/08C07C11/10
CPCY02P20/52B01J23/78B01J23/8892C07C1/044C07C2523/78C07C2523/889C07C11/04C07C11/06C07C11/08C07C11/10
Inventor 张建利陈宁赵天生范素兵马清祥
Owner NINGXIA UNIVERSITY
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