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A kind of low-carbon olefin catalyst and preparation method thereof

A technology for low-carbon olefins and catalysts, which is applied in the field of high-activity and stable supported iron-based syngas-based low-carbon olefin catalysts and its preparation, and can solve the problems of low-carbon olefin catalyst activity and stability, low CO conversion, and low-carbon olefin catalysts. Catalyst cost is high, to achieve the effect of outstanding comprehensive performance, improved conversion rate, and improved selectivity

Active Publication Date: 2019-03-19
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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  • A kind of low-carbon olefin catalyst and preparation method thereof

Examples

Experimental program
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Effect test

example 1

[0023] 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 Fushun branch of Sinopec Catalyst Co., Ltd., the following examples and comparative examples all use the alumina), adopt the unsaturated spray impregnation method to impregnate nickel and gallium molar concentrations are respectively 0.5mol / L, 1mol / L nickel nitrate and gallium nitrate mixed aqueous solution, impregnation temperature is 50°C, impregnation time is 3h, impregnation amount is 20% of the amount of saturated absorption solution of alumina carrier, dried at 120°C for 5h, and calcined at 850°C Under roasting for 6h. The unsaturated carrier after roasting is sprayed and dipped in triethylamine aqueous solution, and the triethylamine aqueous solution spray volume is 35% of the total saturated water absorption of the carrier used, and the mass content of triethylamine in the triethylamine aqueous solution is 8% of...

example 2

[0026]Weigh commercially available alumina, impregnate 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, immersion temperature at 60°C, immersion time for 2 hours, The amount is 40% 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, 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 generated for 5 hours after spraying and dipping, Dry at 90°C for 8h. The rest are the same as in Example 1, and the prepared catalyst is denoted as C-2, and the 300h evaluation results are shown in Table 1.

example 3

[0028] 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 low-carbon olefin preparation catalyst and a preparation method thereof. The preparation method of the catalyst comprises the following steps: 1, preparing a nickel salt and gallium salt mixed aqueous solution, and impregnating alumina used as a carrier in the mixed aqueous solution by adopting an unsaturated impregnation technology; 2, impregnating a roasted carrier obtained in step 1 in a wetting solution containing an adsorbent by adopting the an unsaturated impregnation technology, wherein the adsorbent is C2-15 organic amine; and 3, drying the adsorbent-containing carrier, obtained in step 2, impregnating the dried adsorbent-containing carrier in a solution containing active metal iron, drying the impregnated adsorbent-containing carrier, roasting the dried adsorbent-containing carrier, impregnating the roasted adsorbent-containing carrier in a metal assistant, drying the carrier, and roasting the dried carrier to prepare the synthetic gas-to-low carbon olefin catalyst. The catalyst has the characteristics of high long-time cycle running activity stability, and facilitation of industrial application and promotion.

Description

technical field [0001] The invention relates to a catalyst for preparing low-carbon olefins and a preparation method thereof, in particular to a catalyst with high activity and stability loaded iron-based synthesis gas for preparing low-carbon olefins 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 and propy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/889C07C1/04C07C11/02
CPCB01J23/8892C07C1/044C07C1/0445C07C2523/889C07C11/02
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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