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Fe-based hydrogenation catalyst and preparation method therefor

The technology of catalyst and auxiliary agent is applied in the field of high activity and stability supported iron-based synthesis gas to low-carbon olefin catalyst and its preparation, and can solve the problem that the activity stability of low-carbon olefin catalyst needs to be further improved, the catalyst cost is high, and the CO conversion problems such as low rate, to achieve the effect of outstanding comprehensive performance, improved conversion rate, and improved selectivity

Active Publication Date: 2015-11-25
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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  • Fe-based hydrogenation catalyst and preparation method therefor

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0025] Weigh commercially available spherical 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 dried 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 was impregnated with an aqueous zinc nitrate solution with a mass fraction of 5% by unsaturated spray impregnation method, the immersion temperature was 50°C, the immersion time was 3h, the impregnation amount was 20% of the ...

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 an aqueous solution of zinc sulfate with a mass fraction of 10% by an unsaturated impregnation method. Dry for 10h, then bake 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, oxygen is genera...

example 3

[0030] 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

The invention discloses a Fe-based hydrogenation catalyst and a preparation method therefor, wherein the preparation method comprises following steps: (1) impregnating an alumina carrier into a buffer solution containing ammonium salt by using an incipient-wetness impregnation method; drying until the adsorption quantity of the buffer solution containing ammonium salt is 30-60% of the quantity of the saturation absorbing solution of the alumina carrier; (2) impregnating the modified alumina carrier prepared by step (1) into a zinc salt solution by using an unsaturated impregnation method; (3) impregnating the roasted carrier in step (2) into a fountain solution containing an adsorbent by using the unsaturated impregnation method; (4) impregnating the carrier containing the adsorbent in step (3) into a solution containing an active metal iron; impregnating the carrier into a metal auxiliary agent after drying and roasting; getting a catalyst for preparing a low carbon olefin by synthetic gas after drying and roasting. The catalyst has high activity and stability in long-time running, and facilitates industrial application and popularization.

Description

technical field [0001] The invention relates to a catalyst for producing olefins from synthesis gas and a preparation method thereof, in particular to a high-activity and stability 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 of ethy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01J37/02C07C11/04C07C11/06C07C11/08C07C1/04
CPCY02P20/52
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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