Catalyst for producing olefins from synthesis gas and preparation method thereof

A catalyst and synthesis gas technology, which is applied in the field of high activity and stability supported iron-based synthesis gas to low-carbon olefin catalyst and its preparation, can solve the problem that the activity stability of the 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: 2017-07-14
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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  • Catalyst for producing olefins from synthesis gas and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

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 Sinopec Catalyst Co., Ltd. Fushun branch, the following examples and comparative examples all use the alumina), the sucrose mass concentration is 5% aqueous solution with sulfuric acid to adjust the pH value equal to 3. Immediately after the saturated spraying and impregnating alumina, dry at 95°C for 1 hour, the adsorption amount of the acidic solution for drying sugar is 60% of the saturated absorption solution of the alumina carrier, aging at 60°C for 7 hours, and drying at 100°C 24 hours, and then calcined at 300° C. for 5 hours to obtain 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 ...

example 2

[0028] Weigh commercially available alumina, adjust the pH value of the aqueous solution with a sucrose mass concentration of 20% to 1 with sulfuric acid, and immediately dry at 110°C for 0.5h after saturated spraying and impregnating the alumina to reach the adsorption capacity of the acidic solution of sugar. It is 40% of the saturated absorption solution of the alumina carrier, 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 10 hours, then bake 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 ...

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 acidic solution containing sugar, then drying the alumina carrier until the adsorption quantity of the acidic solution containing sugar 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) impregnating the adsorbent-containing carrier obtained in the step (3) in a solution containing active metal iron and an auxiliary agent manganese 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 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 a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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