A catalyst for producing low-carbon olefins from synthesis gas and its preparation method

A low-carbon olefin and catalyst technology, which is applied in the field of synthesis gas to low-carbon olefin catalyst and its preparation, can solve the problems that the activity stability of the low-carbon olefin catalyst needs to be further improved, the CO conversion rate is low, and the catalyst cost is high, and the comprehensive performance is achieved. The effect of highlighting, improving conversion rate and improving selectivity

Active Publication Date: 2017-10-03
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] CN1065026A discloses a method for producing ethylene from synthesis gas, which involves the preparation of catalysts by chemical precipitation and mechanical mixing, using precious metals or rare metals, such as niobium, gallium, praseodymium, scandium, indium, cerium, lanthanum, ytterbium, etc. For other chemical elements, the selectivity of ethylene is 65%-94%, but the conversion rate of CO is very low, only about 10%, 12% and 15%. The recycling of CO will inevitably lead to energy consumption, and the catalyst cost is high
However, the activity stability of the long-term operation of the above-mentioned Fe-based silica gel-supported synthesis gas to directly prepare low-carbon olefins catalysts still needs to be further improved.

Method used

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  • A catalyst for producing low-carbon olefins from synthesis gas and its preparation method

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Experimental program
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example 1

[0023] Weigh commercially available alumina (pore volume is 0.96ml / g, specific surface area is 286.81m 2 / g, the saturated water absorption is 145ml / g, provided by Fushun Branch of Sinopec Catalyst Co., Ltd., the following examples and comparative examples all use the alumina), and the unsaturated spray impregnation method is used to impregnate the nitric acid with a mass fraction of 5%. Zinc aqueous solution, impregnation temperature is 50°C, impregnation time is 3h, impregnation amount is 20% of the amount of saturated absorption solution of the alumina carrier, dried at 120°C for 5h, calcined at 850°C for 6h. The unsaturated carrier after roasting is sprayed and dipped in triethylamine aqueous solution, and the triethylamine aqueous solution spray volume is 35% of the total saturated water absorption of the carrier used, and the mass content of triethylamine in the triethylamine aqueous solution is 8% of the carrier mass, After spray impregnation, dry at 100°C for 5h. Base...

example 2

[0026]Weigh commercially available alumina, impregnate a zinc sulfate aqueous solution with a mass fraction of 10% by unsaturated impregnation method, the impregnation temperature is 60°C, the impregnation time is 2h, and the impregnation amount is 40% of the saturated absorption solution of the alumina carrier, at 90°C Dry at 900°C for 4 hours. The unsaturated carrier after roasting is sprayed and dipped in morphine aqueous solution. The spray volume of morphine aqueous solution is 10% of the total saturated water absorption of the carrier used. The mass content of morphine in the morphine aqueous solution is 2% of the carrier mass. Dry at 90°C for 8h. Based on the final catalyst Fe content of 9wt% and manganese content of 3.6wt%, the carrier for adsorbing morphine was impregnated with ferric nitrate and manganese nitrate aqueous solution by equal volume impregnation method, dried at 100°C for 16 hours, and calcined at 550°C for 4 hours. Based on the mass ratio of Fe, K and ...

example 3

[0028] Except that 5% ammonium citrate was added to the impregnated mixed aqueous solution of ferric nitrate and manganese nitrate, the rest was the same as in Example 1, and the prepared catalyst was recorded as C-3, and the evaluation results after 300 hours were shown in Table 1.

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Abstract

The invention discloses a preparation method of a catalyst for producing low-carbon olefins from synthesis gas, which comprises the following steps: (1) using alumina as a carrier to impregnate a zinc salt solution by an unsaturated impregnation method, drying and roasting; (2) using an unsaturated impregnation method Impregnate the calcined carrier in step (1) with a wetting solution containing an adsorbent, wherein the adsorbent is an organic amine with a carbon number of 2 to 15, and the amount of the adsorbent added accounts for 1%~10% of the weight of the carrier; (3) Step (2) The carrier containing the adsorbent is dried and impregnated with a solution containing active metal iron and additive manganese, and after drying and roasting, it is unsaturated sprayed and impregnated with the metal additive Potassium, and then dried and roasted to obtain a low-carbon olefin catalyst from synthesis gas. The catalyst has the characteristics of high activity and stability in long-period operation, and is beneficial to industrial application and popularization.

Description

technical field [0001] The invention relates to a catalyst for producing low-carbon olefins from synthesis gas and a preparation method thereof, in particular to a high-activity and stable loaded iron-based catalyst for producing low-carbon olefins from synthesis gas and a preparation method thereof. Background technique [0002] Low-carbon olefins such as ethylene and propylene are important basic organic chemical raw materials. With the development of the chemical industry, their demand is increasing. So far, the way to produce low-carbon olefins such as ethylene and propylene is mainly through the cracking process of light oil. With the increasing depletion of oil resources worldwide, the future energy structure will inevitably shift. Compared with oil resources, coal and natural gas resources are relatively abundant, and it is of great significance to develop low-carbon olefin production processes based on coal and natural gas. The development of direct production of et...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/889C07C1/04C07C11/04C07C11/06C07C11/08
CPCY02P20/52
Inventor 李杰张信伟张舒东尹泽群刘全杰
Owner CHINA PETROLEUM & CHEM CORP
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