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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 Iron-based catalyst for producing light olefins by hydrogenation and its preparation and application

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

Embodiment 1

[0043] 15.81g FeCl 3 ·6H 2 O, 6.27g FeCl 2 4H 2 O, by Fe 3+ :Fe 2+ =65:35 molar ratio is mixed into the salt solution that Fe concentration is about 1mol / L, and the 12.1mol / L HCl solution of 2.5mL is added. Add 180 mL of 1.5 mol / L NaOH solution at a constant speed at 60°C under stirring conditions. Within about 1.5 h, 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, the deposited product was separated by magnetic field adsorption, washed fully with deionized water, and then dried at 60°C to obtain a catalyst sample. The sample was ground, pressed into tablets and passed through a 20-40 mesh sieve for later use. Fe 3 o 4 The synthesis reaction equation of is:

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

[0045] Reduction conditions: under normal pressure, pure H 2 , the temperature...

Embodiment 2

[0047] Take by weighing the catalyst sample 1.0g that embodiment 1 method prepares, evaluate in fixed-bed reactor: reduction condition: 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. Reaction condition: H 2 / CO 2 =3.0, the temperature is 320°C, the pressure is 0.1-5.0MPa, and the space velocity is 2000mL / (h·g cat ), the influence of the reaction pressure on the performance of the catalyst was investigated, and the test results (see Table 2) showed that as the reaction pressure increased, the CO 2 The conversion rate increased gradually, while the CO selectivity and C 2 ＝ ~C 4 ＝ Selectivity gradually decreases.

Embodiment 3

[0049] Take by weighing the catalyst sample 0.4g that embodiment 1 method prepares, evaluate in fixed-bed reactor: reduction condition: 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. Reaction condition: H 2 / CO 2 =3.0, the temperature is 320°C, the pressure is 3.0MPa, the space velocity is 2000~20000mL / (h·g cat ), investigated the influence of feed gas space velocity on catalyst performance, test result (see table 3) shows, C 2 ＝ ~C 4 ＝ As the space velocity increases, the selectivity first increases gradually and then begins to decrease. When the space velocity is 8000mL / (h g cat ) reached the maximum; the catalyst at 20000mL / (h·g cat ) airspeed, still maintain high CO 2 conversion (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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