Catalyst used in preparation of olefin from synthetic gas, and preparation method and application thereof

A catalyst and synthesis gas technology, which is applied in the field of low-carbon olefin catalysts and preparations of high-activity and stable supported iron-based synthesis gas production, and can solve the problems of low-carbon olefin catalyst activity and stability, low CO conversion rate, and low-carbon olefin catalysts. High cost and other issues, to achieve the effect of outstanding comprehensive performance, improved conversion rate, and improved 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%,

Method used

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  • Catalyst used in preparation of olefin from synthetic gas, and preparation method and application thereof

Examples

Experimental program
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Effect test

example 1

[0025] 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 this alumina), the mass concentration is 5% pyridine aqueous solution saturated spray impregnated alumina Immediately after the end, dry at 95°C for 1h, the adsorption amount of the pyridine aqueous solution is 60% of the saturated absorption solution of the alumina carrier, aging at 60°C for 7h, drying at 100°C for 24 hours, and then roasting at 300°C for 5 hours The modified alumina carrier was prepared in hours. 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 saturated absorption solution of the a...

example 2

[0028] Weigh commercially available alumina, saturate spray and impregnate the alumina with a mass concentration of 20% diethanolamine aqueous solution, and immediately dry at 110°C for 0.5h after drying until the adsorption amount of the diethanolamine aqueous solution is the amount of the 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. Dry at...

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 preparation method for a catalyst used in preparation of low-carbon olefin from synthetic gas. The preparation method comprises the following steps: (1) subjecting an alumina carrier to equivalent-volume saturated impregnation of an aqueous solution of an organic compound containing nitrogen, then drying the alumina carrier until the adsorption quantity of the aqueous solution of the organic compound containing nitrogen is 30 to 60% of the saturated solution absorption quantity of the alumina carrier and carrying out ageing, drying and roasting so as to obtain a modified alumina carrier; (2) impregnating the modified alumina carrier prepared in the step (1) in a zinc salt solution by using a nonsaturated impregnation method and then carrying out drying and roasting; (3) impregnating the roasted carrier in the step (2) with a wetting solution containing an adsorbent by using the nonsaturated impregnation method; and (4) subjecting the adsorbent-containing carrier obtained in the step (3) to saturated co-impregnation of a mixed solution containing active metal iron, an auxiliary agent manganese and an auxiliary agent potassium after drying and carrying out 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 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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IPC IPC(8): B01J23/889C07C11/04C07C11/06C07C11/08C07C1/04
CPCY02P20/52
Inventor 李杰张信伟张舒东孙晓丹尹泽群刘全杰
Owner CHINA PETROLEUM & CHEM CORP
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