Catalyst for producing olefin by hydrogenation of CO and preparation method thereof

A catalyst, low-carbon olefin technology, applied in catalyst activation/preparation, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc. High cost, low CO conversion rate, etc., to achieve the effect of outstanding comprehensive performance, improved conversion rate, and improved selectivity

Active Publication Date: 2017-05-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 olefin by hydrogenation of CO 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 is impregnated with nickel and gallium mixed aqueous solution of nickel nitrate and gallium nitrate with molar concentrations of 0.5mol / L and 1mol / L respectively by unsaturated spray impregnation method, the im...

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 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. It 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...

example 3

[0030] Except that 5% ammonium thiocyanate was added to the impregnated ferric nitrate aqueous solution, the rest were 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 catalyst for producing olefin by hydrogenation of CO and a preparation method thereof. The preparation of the catalyst comprises the following steps: (1) an aluminum oxide carrier is treated by isovolumetric saturated impregnation with an acidic solution of sugar; (2) a mixed aqueous solution of nickel salt and gallium salt is prepared, and the modified aluminum oxide carrier prepared in the step (1) is treated by impregnation with the mixed aqueous solution by a nonsaturated impregnation method; (3) wetting liquid containing an adsorbent is used for impregnation of the carrier after calcination in step (2) by using a nonsaturated impregnation method; (4) the carrier containing the adsorbent in the step (3) is treated by impregnation with a solution containing active metal iron, drying and calcination are carried out, a metal auxiliary agent is used for impregnation, and drying and calcination are carried out in order to obtain the catalyst for producing light olefin from synthetic gas. The catalyst has the characteristics of long-time cycle running as well as high activity and stability, and the catalyst is good for industrial application and promotion.

Description

technical field [0001] The invention relates to a catalyst for CO hydrogenation to olefins and a preparation method thereof, in particular to a highly active and stable loaded iron-based synthesis gas-to-low-carbon olefins 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 technolog...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01J23/94B01J37/02B01J35/10C07C1/04C07C11/04C07C11/06C07C11/08
CPCY02P20/52Y02P20/584
Inventor 李杰张信伟张舒冬孙晓丹尹泽群刘全杰
Owner CHINA PETROLEUM & CHEM CORP
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