Iron-based catalyst for low-carbon olefin production through CO2 hydrogenation, and preparation and applications thereof

A technology for iron-based catalysts and low-carbon olefins, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, and hydrocarbon production from carbon oxides, etc., can solve the problem of wide distribution of hydrocarbon products and cost of preparation high catalyst particle size distribution, etc., to achieve the effect of low catalyst cost, simple preparation method and high mechanical strength

Active Publication Date: 2016-10-19
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The technical problem to be solved by the present invention is to provide a method for CO 2

Method used

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  • Iron-based catalyst for low-carbon olefin production through CO2 hydrogenation, and preparation and applications thereof
  • Iron-based catalyst for low-carbon olefin production through CO2 hydrogenation, and preparation and applications thereof
  • Iron-based catalyst for low-carbon olefin production through CO2 hydrogenation, and preparation and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0042] Example 1

[0043] 15.81g FeCl 3 ·6H 2 O, 6.27g FeCl 2 ·4H 2 O, press Fe 3+ :Fe 2+ =65:35 molar ratio is mixed into a salt solution with a Fe concentration of about 1mol / L, and 2.5mL of 12.1mol / L HCl solution is added. Under stirring conditions at 60°C, add 180 mL of 1.5mol / L NaOH solution at a constant speed. In about 1.5h, the pH of the solution was adjusted from acidic to about 10.0. After the addition is complete, keep the temperature and continue to stir for 1 hour, and finally cool to room temperature. After the reaction, the deposited products are separated by magnetic field adsorption, washed thoroughly with deionized water, and dried at 60°C to prepare a catalyst sample. The sample is ground, tableted, and passed through a 20-40 mesh sieve for use. Fe 3 O 4 The synthesis reaction equation is:

[0044] Fe 2+ +2Fe 3+ +8OH - →Fe(OH) 2 +2Fe(OH) 3 →Fe 3 O 4 +4H 2 O.

[0045] Reduction conditions: normal pressure, pure H 2 Medium, the temperature is 350℃, the space ve...

Example Embodiment

[0046] Example 2

[0047] Weigh 1.0 g of the catalyst sample prepared by the method in Example 1, and evaluate it in a fixed bed reactor: reduction conditions: normal pressure, pure H 2 Medium, the temperature is 350℃, the space velocity is 1500mL / (h·g cat ), the reduction time is 12h. Reaction conditions: H 2 / CO 2 =3.0, temperature is 320℃, pressure is 0.1~5.0MPa, space velocity is 2000mL / (h·g cat ), the effect of reaction pressure on the performance of the catalyst was investigated. The test results (see Table 2) show that as the reaction pressure increases, CO 2 The conversion rate gradually increased, and the CO selectivity and C 2 ＝ ~C 4 ＝ The selectivity gradually decreases.

Example Embodiment

[0048] Example 3

[0049] Weigh 0.4 g of the catalyst sample prepared by the method in Example 1, and evaluate it in a fixed bed reactor: reduction conditions: normal pressure, pure H 2 Medium, the temperature is 350℃, the space velocity is 1500mL / (h·g cat ), the reduction time is 12h. Reaction conditions: H 2 / CO 2 =3.0, temperature is 320℃, pressure is 3.0MPa, space velocity is 2000~20000mL / (h·g cat ), the influence of the feed gas space velocity on the performance of the catalyst was investigated. The test results (see Table 3) show that C 2 ＝ ~C 4 ＝ The selectivity increases gradually with the increase of the space velocity and then begins to decrease. When the space velocity is 8000mL / (h·g cat ) Reaches the maximum; the catalyst is at 20000mL / (h·g cat ) At airspeed, still maintain high CO 2 Conversion rate (31.8%) and high C 2 ＝ ~C 4 ＝ Selectivity (45.7%).

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Abstract

The present invention provides an iron-based catalyst for low-carbon olefin production through CO2 hydrogenation, wherein the main active component of the catalyst is Fe3O4, the auxiliary agent is added or is not added, and is an oxide, the content of the auxiliary agent accounts for 0-30% of the total mass of the catalyst, and the auxiliary agent is one or more than two selected from the oxide of Si, Al, Mn, K, Cu, Na, Zr, V, Zn and Ce. The present invention further provides a preparation method and applications of the catalyst. According to the present invention, the catalyst has the following beneficial effects that 1) the particles have characteristics of regular spherical shape, uniform spatial distribution, and narrow size distribution; 2) the raw materials are inexpensive and easy to obtain, and the preparation method has characteristics of simpleness and low cost, and is suitable for industrial production; 3) the catalyst has characteristics of high mechanical strength, good wear resistance and compression resistance, and is suitable for the fixed bed, the fluidized bed and the slurry bed; 4) the CO2 hydrogenation activity and the low-carbon olefin selectivity are high, the single-pass conversion rate can achieve more than 40%, the methane selectivity in the hydrocarbon product is lower than 15%, the low-carbon olefin selectivity is higher than 40%, the alkene/alkane ratio (O/P) is 2-12, and the yield of the low-carbon olefin can achieve 10-60 g/m<3> (CO2+H2).

Description

technical field [0001] The invention belongs to CO 2 The field of hydrogenation to prepare low-carbon olefin catalysts, specifically related to a CO 2 Iron-based catalyst for hydrogenation to produce light olefins and its preparation and application. Background technique [0002] CO 2 It is the cheapest and most abundant resource in the carbon family, and it is extremely abundant on the earth. With the continuous development of human society, the use of fossil energy has increased sharply, and CO in the atmosphere 2 The content of carbon dioxide is increasing day by day, which not only exacerbates the greenhouse effect, but also causes a huge waste of carbon resources. Carry out CO 2 Transformation and utilization research, turning harm into wealth, is of great significance both in terms of economic and social benefits. [0003] Light olefins are important chemical raw materials, currently mainly derived from naphtha cracking. With the continuous rise of crude oil pri...

Claims

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Application Information

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IPC IPC(8): B01J23/745B01J23/78B01J23/80C07C1/12C07C11/04C07C11/06C07C11/08
CPCY02P20/52
Inventor 葛庆杰位健徐恒泳方传艳
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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