Supported iron-based catalyst and preparation method thereof

A catalyst and carrier technology, which is applied in the field of synthesis gas-to-light olefin catalyst and its preparation, can solve the problems such as the need to further improve the activity stability of the low-carbon olefin catalyst, the high cost of the catalyst, and the low CO conversion rate, and achieve outstanding comprehensive performance. , improve the conversion rate, improve the effect of selectivity

Active Publication Date: 2015-11-25
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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  • Supported iron-based catalyst and preparation method thereof

Examples

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example 1

[0023] Weigh commercially available spherical 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 alumina carrier, dried at 120°C for 5h, roasted 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. ...

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, oxygen is generated for 5 hours after spraying and dipping, Dry at 90°C for 8h. The rest are the same as in Example 1, and the prepared catalyst is denoted as C-2, and the 300h evaluation results are shown in Table 1.

example 3

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

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Abstract

A supported iron-based catalyst and a preparation method thereof. The invention discloses a preparation method of a catalyst for preparing a low carbon olefin by synthetic gas including the following steps: (1) immersing an alumina carrier into a zinc salt solution by using an unsaturated immersion method, and roasting at 700-1000 DEG C for 1-10 hours after drying; (2) immersing the roasted carrier in step (1) into a fountain solution containing an adsorbent by using the unsaturated immersion method, wherein the adsorbent is an organic amine with 2-15 carbons, and the addition of the adsorbent is 1%-10% of the weight of the roasted carrier in step (1); (3) immersing the dried carrier containing the adsorbent in step (2) into a solution containing an active metal iron; immersing the carrier into a metal auxiliary agent after drying and roasting; and getting the catalyst for preparing the low carbon olefin by synthetic gas after drying and roasting. The catalyst has high activity and stability in long-time running, and facilitates the 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 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889C07C1/04C07C11/02
Inventor 王诗语李杰张舒冬张信伟孙晓丹尹泽群刘全杰
Owner CHINA PETROLEUM & CHEM CORP
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