Iron-based catalyst and preparation method thereof

The technology of catalyst and auxiliary agent is applied in the field of iron-based catalyst and its preparation, which can solve the problems that the activity stability of 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 outstanding and the conversion rate is improved. , improve the effect of selectivity

Active Publication Date: 2016-06-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Iron-based catalyst and preparation method thereof

Examples

Experimental program
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Effect test

example 1

[0023] 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), adopt the unsaturated spray impregnation method to impregnate nickel and gallium molar concentrations are respectively 0.5mol / L, 1mol / L nickel nitrate and gallium nitrate mixed aqueous solution, the impregnation temperature is 50°C, the impregnation time is 3h, the impregnation amount is 20% of the saturated absorption solution of the alumina carrier, dried at 120°C for 5h, and calcined at 850°C Under roasting 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...

example 2

[0026] Weigh commercially available alumina, impregnate 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, immersion temperature at 60°C, immersion time for 2 hours, The amount 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 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 a mixed solution containing active metal iron, additive manganese and additive potassium by an e...

example 3

[0028] Except that 5% ammonium thiocyanate 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 for an iron-based catalyst. The preparation method comprises the following steps: (1) preparing a mixed aqueous solution of a nickel salt and a gallium salt and impregnating an alumina carrier with the mixed aqueous solution by using a nonsaturated impregnation method; (2) impregnating the carrier roasted in the step (1) with a wetting solution containing an adsorbent by using the unsaturated impregnation method; and (3) subjecting the adsorbent-containing carrier obtained in the step (2) to impregnation of a mixed solution containing active metal iron, an auxiliary agent manganese and an auxiliary agent potassium after drying, carrying out drying and roasting, then carrying out unsaturated spraying and impregnation of a metallic auxiliary agent potassium solution and subjecting the carrier to drying and roasting so as to obtain the catalyst used in preparation of low-carbon olefin from synthetic gas. The catalyst has the characteristics of long-cycle operation activity and high stability and is beneficial for industrial application and promotion.

Description

technical field [0001] The invention relates to an iron-based catalyst and a preparation method thereof, in particular to a highly active and stable supported iron-based syngas-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 petroleum 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 c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889C07C1/04C07C11/02
Inventor 马荣华
Owner CHINA PETROLEUM & CHEM CORP
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