Iron-based catalyst prepared by sol-gel combustion method, and preparation method and applications of iron-based catalyst

An iron-based catalyst, sol-gel technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of catalytic activity and low-carbon olefin selectivity decline , Serious blockage of catalytic bed and separation equipment, reduction of mechanical strength and other problems, to achieve good anti-carbon deposition ability, solve the phenomenon of catalyst carbon deposition and pulverization, and improve the effect of life

Active Publication Date: 2017-01-11
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the reaction temperature of the iron-based catalyst prepared by the co-precipitation method is high, a large amount of carbon deposits will be generated, causing the catalyst to be pulverized, the mechanical strength will be reduced, and the catalytic bed and separation equipment will be severely blocked. At the same time, the active site will be blocked, resulting in catalytic activity and low-carbon olefin selection. Sexual decline (Science 2012, 335, 835-838; ACS Catalysis 2013, 3, 2130-2149.)

Method used

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  • Iron-based catalyst prepared by sol-gel combustion method, and preparation method and applications of iron-based catalyst
  • Iron-based catalyst prepared by sol-gel combustion method, and preparation method and applications of iron-based catalyst
  • Iron-based catalyst prepared by sol-gel combustion method, and preparation method and applications of iron-based catalyst

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The preparation of embodiment 1 catalyst sample

[0039] 20.0g ferric nitrate nonahydrate and 10.1g manganese nitrate hexahydrate are dissolved in 200ml deionized water, then add 0.25mol of citric acid (the mol ratio of Fe to citric acid is 0.2), stir to obtain mixed solution I; Add 20wt% ammonia water to the solution I, adjust the pH value of the system to 7, and stir and reflux at 80°C for 5h to ensure that the citric acid and metal ions are completely chelated to obtain a mixed solution II; the mixed solution II is continuously stirred and evaporated at 60°C to In the gel state, add 19g of 10% potassium carbonate, stir evenly, and dry at 100°C for 12 hours to obtain a dried sample, which is designated as sample G1 # .

[0040] Sample G2 # ~G15 # The specific preparation steps are the same as sample G1 # , Fe source, A source and B source type and dosage and preparation conditions are shown in Table 1. Sample G1 after drying by XRF # ~G15 # The elemental compos...

Embodiment 2

[0045] The preparation of sample after embodiment 2 drying

[0046] Roasting embodiment 1 gained sample G1 in air # ～G15 #

[0047] The dried sample G1 # ~G15 # Put it in a muffle furnace, roast in an air atmosphere, raise the temperature to the roasting temperature at a certain heating rate, and after roasting for a period of time, the iron-based catalyst is obtained, which is designated as sample 1 # ~Sample 15 # .

[0048] sample 1 # ~Sample 15 # The specific roasting conditions are shown in Table 2.

[0049] Table 2

[0050]

[0051]

[0052] Roasting embodiment 1 gained sample G1 in non-reactive atmosphere # ～G15 #

[0053] The dried sample G1 # ~G15 # Put it in a muffle furnace, pass inactive gas, raise the temperature to the roasting temperature at a certain heating rate, after roasting for a period of time, cool down to 20°C; Gasification, passivation for a period of time, to obtain the iron-based catalyst, denoted as sample 16 # ~Sample 30 ...

Embodiment 4

[0061] Example 4 Sample 1 # ~Sample 15 # Reaction Performance Test of Syngas to Light Olefins

[0062] Take sample D1 separately # , sample 1 # ~Sample 15 # 2g each, put into a reaction tube, and combine the liner, quartz wool and quartz sand to keep the sample in a constant temperature section. Put the reaction tube into the fixed bed device, make the thermocouple at the height of the catalyst, connect other accessories, and check the air tightness of the device. Reduction treatment is carried out before the reaction, and the reduction gas is introduced, and the reduction is performed for a period of time at a certain temperature. After the reduction, the synthesis gas is introduced to test the reaction performance of the conversion of the synthesis gas to light olefins. The online chromatographic detection of the reaction product was carried out every 30 min. After 24 hours of reaction, each sample was taken out, and the amount of carbon deposited on the sample after ...

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Abstract

The invention discloses an iron-based catalyst prepared by a sol-gel combustion method, which is characterized by containing a metal element Fe, a metal element A and a metal element B, wherein A is at least one selected from the group consisting of Mn, Co, Cu, Zn, Ti, Al, Cr, Ni, Ce, and Zr; B is at least one selected from the group consisting of Li, Na, K, Mg, and Ca; each metal element exists in the form of a metal simple substance and/or a metal oxide; and the content of the metal element A in the catalyst is 0.1-50 wt%, the content of the metal element B in the catalyst is 0.01-40 wt%, and the content of the metal element Fe in the catalyst is 50-99 wt%, based on the total amount of the metal elements contained in the catalyst. The catalyst has good resistance to carbon deposition, is used for reaction of preparation of low-carbon olefins by use of synthetic gas, and shows higher catalytic activity and low-carbon olefin selectivity.

Description

technical field [0001] The application relates to an iron-based catalyst prepared by a sol-gel combustion method, its preparation method and its application in the reaction of producing low-carbon olefins from syngas. Background technique [0002] Ethylene and propylene are bulk chemical raw materials, which occupy a very important position in the national economy. The traditional production method is through petroleum catalytic cracking. However, my country's energy structure is characterized by rich coal, lack of oil, and little gas. The conversion of coal-based synthesis gas Low-carbon olefins can effectively reduce dependence on petroleum resources. Iron-based catalysts are the preferred catalysts for the direct preparation of light olefins from syngas due to their high catalytic efficiency. Iron-based catalysts are the focus of research on the direct preparation of low-carbon olefins from coal-based synthesis gas. They are inexpensive, allow a wide range of operating te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01J23/78B01J23/80B01J23/86B01J23/83C07C1/04C07C11/02
Inventor 陈艳平朱文良刘中民刘勇石磊刘红超倪友明
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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