A kind of iron-based hydrogenation catalyst and preparation method thereof

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 CO conversion rate is low, and the catalyst The problem of high cost, to achieve the effect of outstanding comprehensive performance, improved conversion rate, and improved selectivity

Active Publication Date: 2017-06-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
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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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  • A kind of iron-based hydrogenation catalyst and preparation method thereof

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Effect test

example 1

[0025] 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 the Fushun branch of Sinopec Catalyst Co., Ltd., the following examples and comparative examples all use this alumina), the ammonium carbonate aqueous solution with a mass concentration of 5% is saturated by spray impregnation oxidation Aluminum, dry at 95℃ for 1h immediately after completion, the adsorption capacity of dried ammonium carbonate aqueous solution is 60% of the saturated absorption solution of alumina carrier, age at 60℃ for 7h, dry at 100℃ for 24 hours, then at 300℃ The modified alumina carrier was prepared by calcination for 5 hours. The above-mentioned modified alumina carrier is impregnated with a zinc nitrate aqueous solution with a mass fraction of 5% by the unsaturated spray impregnation method. The impregnation temperature is 50℃, the immersion time is 3h, and the impregnation amount is...

example 2

[0028] Weigh the commercially available alumina, immerse the alumina in a saturated spray with a mass concentration of 20% ammonium acetate aqueous solution, and dry it at 110°C for 0.5h immediately after completion, until the adsorption capacity of the ammonium acetate aqueous solution is the saturated absorption solution of the alumina carrier Aging at 80°C for 4 hours, drying at 120°C for 8 hours, and calcining at 400°C for 3 hours to obtain modified alumina support. The above-mentioned modified alumina carrier is impregnated with 10% zinc sulfate aqueous solution by the unsaturated dipping method. The immersion temperature is 60℃, the immersion time is 2h, and the dipping amount is 40% of the saturated absorption solution of the alumina carrier, at 90℃ Dry for 10 hours, and calcinate at 900°C for 4 hours. The roasted carrier is unsaturated and sprayed and immersed in the morphine aqueous solution. The spray volume of the morphine aqueous solution is 10% of the total saturat...

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. The prepared catalyst was recorded as C-3, and the 300h evaluation results are 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 preparing olefins from synthesis gas and a preparation method thereof, in particular to a catalyst for preparing low-carbon olefins from synthesis gas with high activity and stability supported by iron and a preparation method thereof. Background technique [0002] Low-carbon olefins such as ethylene and propylene are important basic organic chemical raw materials, and 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 has mainly been through the cracking process of light oil. With the increasing depletion of petroleum resources on a global scale, the future energy structure is bound to shift. Compared with petroleum 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 techn...

Claims

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Application Information

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Patent Type & Authority Patents(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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