A kind of preparation method of supported iron-based catalyst

A catalyst and carrier technology, which is applied in the field of preparation of supported iron-based catalysts, can solve the problems of low-carbon olefin catalyst activity and stability, high catalyst cost, and low CO conversion rate, etc., to achieve outstanding comprehensive performance and improve conversion rate, the effect of increasing selectivity

Active Publication Date: 2018-01-16
CHINA PETROLEUM & CHEM CORP +1
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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 kind of preparation method of supported iron-based catalyst

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example 1

[0025] Weigh commercially available alumina (pore volume is 0.96ml / g, specific surface area is 286.81m 2 / g, 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), the mass concentration is 5% ammonium carbonate aqueous solution saturated spray dipping oxidation Aluminum, immediately after drying at 95°C for 1 hour, the adsorption capacity of the ammonium carbonate aqueous solution is 60% of the saturated absorption solution of the alumina carrier, aging at 60°C for 7 hours, drying at 100°C for 24 hours, and then drying at 300°C Calcined for 5 hours to prepare a modified alumina carrier. The above-mentioned modified alumina carrier is impregnated with nickel and gallium mixed aqueous solution of nickel nitrate and gallium nitrate with molar concentrations of 0.5mol / L and 1mol / L respectively by unsaturated spray impregnation method, the impregnation temperature is 50°C,...

example 2

[0028] Weigh commercially available alumina, saturate spray and impregnate alumina with a mass concentration of 20% ammonium acetate aqueous solution, and immediately dry at 110°C for 0.5h after drying until the adsorption amount of ammonium acetate aqueous solution is the amount of saturated absorption solution of the alumina carrier 40%, aged at 80°C for 4 hours, dried at 120°C for 8 hours, and then calcined at 400°C for 3 hours to obtain a modified alumina carrier. The above-mentioned modified alumina carrier is impregnated with nickel nitrate and gallium nitrate mixed aqueous solutions with nickel and gallium molar concentrations of 1.5 mol / L and 3 mol / L respectively by unsaturated spray impregnation method. It is 40% of the amount of the saturated absorption solution of the alumina carrier, dried at 90°C for 10h, and calcined at 900°C for 4h. The unsaturated carrier after roasting is sprayed and dipped in morphine aqueous solution. The spray volume of morphine aqueous sol...

example 3

[0030] Except that 5% ammonium thiocyanate was added to the impregnated ferric nitrate aqueous solution, the rest were 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 supported iron-based catalyst, which comprises the following steps: (1) The alumina carrier is equal volume saturated and impregnated with a buffer solution containing ammonium salt, and dried until the adsorption amount of the buffer solution containing ammonium salt is equal to that of the alumina carrier The amount of saturated absorption solution is 30-60%, and the modified alumina carrier is obtained after roasting; (2) The mixed aqueous solution of nickel salt and gallium salt is prepared, and the modified alumina carrier prepared in step (1) is impregnated by unsaturated impregnation method The above mixed aqueous solution is dried and then roasted; (3) impregnating the carrier after step (2) roasting with the wetting solution containing adsorbent by unsaturated impregnation method; The mixed solution of metal iron, additive manganese and additive potassium is dried and calcined to prepare a catalyst for producing low-carbon olefins from syngas. 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 preparation method of a supported iron-based catalyst, in particular to a high-activity and stable supported iron-based synthesis gas-based low-carbon olefin catalyst 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 ethylene and propylene technology from syngas (which ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24C07C1/04C07C11/08C07C11/04C07C11/06
CPCY02P20/52
Inventor 马荣华
Owner CHINA PETROLEUM & CHEM CORP
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