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Iron-based catalyst for preparation of low carbon olefin from synthetic gas, and preparation method and application thereof

A technology of iron-based catalysts and low-carbon olefins, applied in physical/chemical process catalysts, metal/metal oxides/metal hydroxide catalysts, and hydrocarbon production from carbon oxides, etc., can solve the problem of wide catalyst particle size distribution, hydrocarbon Wide product distribution, high preparation cost and other problems, to achieve the effect of narrow size distribution, uniform particle space distribution and high selectivity

Inactive Publication Date: 2015-07-29
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The technical problem to be solved by the present invention is to provide an iron-based catalyst for producing low-carbon olefins from syngas and its preparation and application for existing catalysts with wide particle size distribution, high preparation cost, and wide distribution of hydrocarbon products.

Method used

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  • Iron-based catalyst for preparation of low carbon olefin from synthetic gas, and preparation method and application thereof
  • Iron-based catalyst for preparation of low carbon olefin from synthetic gas, and preparation method and application thereof
  • Iron-based catalyst for preparation of low carbon olefin from synthetic gas, and preparation method and application thereof

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Effect test

Embodiment 1

[0042] 31.62gFeCl 3 ·6H 2 O, 12.54 g FeCl 2 4H 2 O and 2.046gNa 2 SiO 3 9H 2 O by Fe 3+ :Fe 2+ :Si=65:35:4 molar ratio mixed into a salt solution, and 5.10mL of 12.1mol / L HCl solution was added. Add 360ml of 1.5mol / L NaOH solution at a constant speed at 60°C under stirring conditions. Within about 2 hours, the pH of the solution was adjusted from acidic to about 10.0. After the dropwise addition, keep the temperature and continue stirring for 1 h, and finally cool to room temperature. After the reaction, use a magnetic field to separate the deposition product, wash it thoroughly with deionized water, and then dry it at 60°C to obtain the catalyst Fe 3 o 4 / SiO 2 Nanocomposite samples, the samples are prepared after grinding, tableting and sieving (20-40 mesh). Fe 3 o 4 The synthesis reaction equation of is:

[0043] Fe 2+ +2Fe 3+ +8OH–→Fe(OH) 2 +2Fe(OH) 3 → Fe 3 o 4 +4H 2 O.

[0044] Reduction conditions: under normal pressure, pure H 2 , the temperatu...

Embodiment 2

[0046] Take by weighing 4.0g Fe produced by the method of embodiment 1 3 o 4 / SiO 2 Nanocomposite sample, weigh 0.254g KNO 3 , dubbed KNO 3 solution, the above Fe 3 o 4 / SiO 2 Equal volume of the sample was immersed in the above KNO 3 In the solution, stir and stand for 12 hours, dry at 120°C, roast at 400°C for 3 hours, and finally grind, tablet and sieve (20-40 mesh). Reduction conditions: under normal pressure, pure H 2 , the temperature is 350°C, and the space velocity is 1500ml / (h·g cat ), the reduction time is 12h. The reaction conditions are: H 2 / CO=1.0, temperature is 320°C, pressure is 2.0MPa, space velocity is 2000ml / (h g cat ). The results are listed in Table 1.

Embodiment 3

[0048] Take by weighing 4.0g Fe produced by the method of embodiment 1 3 o 4 / SiO 2 Nanocomposite sample, weigh KNO 3 0.254g, measure Mn(NO 3 ) 2 Solution 0.175ml, made into a mixed solution, the above-mentioned Fe 3 o 4 / SiO 2 Immerse equal volume of the sample in the above mixed solution, stir, let it stand for 12 hours, dry at 120°C, and roast at 400°C for 3 hours. The dried product is ground, pressed and sieved (20-40 mesh). Reduction conditions: under normal pressure, pure H 2 , the temperature is 350°C, and the space velocity is 1500ml / (h·g cat ), the reduction time is 12h. The reaction conditions are: H 2 / CO=1.0, temperature is 320°C, pressure is 2.0MPa, space velocity is 2000ml / (h g cat ). The results are listed in Table 1.

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Abstract

The invention provides an iron-based catalyst for preparation of low carbon olefin from synthetic gas. The catalyst contains Fe3O4 as a main active component, and also contains one or two or above assistant M for modification, and M is selected from Si, Al, Mn, K, Cu, Na, Zr, V and Zn. The content of oxide of the assistant in the catalyst is 0-30wt%. The catalyst has the following advantages: 1, particles of the catalyst have regular spherical morphology, uniform space distribution, narrow dimension distribution, and average particle size of 30nm; 2, the catalyst has the characteristics of cheap and easily available raw materials, simple preparation method, low cost, and suitableness for industrial production; 3, the catalyst has good mechanical strength, wear resistance and compression resistance, and is suitable for being applied in fixed beds, fluidized beds and slurry beds; and 4, the catalyst has high Fischer-Tropsch synthesis activity and high low-carbon olefin selectivity, the single-pass conversion rate can reach above 95%, the methane selectivity is lower than 15%, the olefin / paraffin ratio (O / P) is 2-6, and the low-carbon olefin yield can reach 40-100g / m<3>(CO+H2).

Description

technical field [0001] The invention relates to an iron-based catalyst for producing low-carbon olefins from synthesis gas and its preparation and application, in particular to a ferric oxide-based catalyst for producing low-carbon olefins from synthesis gas and its preparation and application. Background technique [0002] Low-carbon olefins (ethylene, propylene) are important chemical raw materials, currently mainly derived from naphtha cracking. With the continuous rise of crude oil prices and increasingly severe environmental problems, non-petroleum route-based low-carbon olefins have attracted more and more attention. Based on the energy characteristics of rich coal, poor oil, and little gas in my country, it is of great strategic significance to develop coal-based synthesis gas to produce low-carbon olefins technology. Among them, the process of producing low-carbon olefins directly from synthesis gas has the advantages of short process, low energy consumption and low ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/745B01J23/78B01J23/889B82Y30/00B82Y40/00C07C11/06C07C11/04C07C11/08C07C1/04
CPCY02P20/52
Inventor 葛庆杰位健方传艳徐恒泳
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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