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Iron-based catalyst and preparation method and application thereof

An iron-based catalyst and catalyst technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of high selectivity of low-carbon alkanes, low yield of low-carbon olefins, high selectivity of methane, etc. problems, to achieve the effects of low methane selectivity, high yield of low-carbon olefins, and high catalytic activity

Inactive Publication Date: 2019-06-11
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0009] Although reported catalysts are able to achieve CO 2 Hydrogenation to synthesize low-carbon olefins, but for the path through methanol midbody, CO 2 The conversion rate is low and the selectivity of low-carbon alkanes in the product is high, which brings great challenges to the subsequent separation of the product
for CO 2 The catalyst for the synthesis of low-carbon olefins through CO intermediates has the problems of high methane selectivity in the product and low yield of low-carbon olefins

Method used

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  • Iron-based catalyst and preparation method and application thereof
  • Iron-based catalyst and preparation method and application thereof
  • Iron-based catalyst and preparation method and application thereof

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Effect test

Embodiment 1

[0038] Weigh 16.22g of FeCl 3 ·6H 2 O and 5.96 g FeCl 2 ·6H 2 O was dissolved in 30ml of deionized water, and 2.5ml of concentrated hydrochloric acid was added to form a mixed solution A. Add 200ml of 5% NH to mixed solution A at a flow rate of 3ml / min using a constant flow pump 3 ·H 2 O (solution B), it was placed in a 40°C water bath and stirred continuously, and aged for 0.5h after the dropwise addition was completed. The obtained turbid liquid was filtered and washed until neutral, and then the filter cake was dried in air at 60° C. for 12 h; the dried solid was calcined in air atmosphere at 350° C. for 4 h to obtain solid C.

[0039] Weigh 2.0g of the above solid C, weigh 0.0746g NaNO 3 Dissolve it in 2ml deionized water to make a solution, impregnate the above solid C sample in the above NaNO 3 solution and mix it well. Immerse at room temperature for 12 hours, dry at 60°C for 12 hours, roast at 350°C for 4 hours, and finally grind, tablet, crush, and sieve (20-4...

Embodiment 2

[0043] Weigh the catalyst 1Na / Fe prepared in the method of embodiment 1 3 o 4 CO 2 Hydrogenation reaction performance evaluation.

[0044] Catalyst reduction conditions: the reducing gas is pure H 2 , purity>99.9%, space velocity is 1800h -1 , the heating rate is 5°C / min, the reduction temperature is 350°C, the pressure is normal pressure, and the reduction time is 12h.

[0045] CO 2 Reaction conditions for the reaction of hydrogenation to synthesize light olefins: molar ratio H 2 :CO 2 =3, the space velocity is 2000mL / (g cat h), the temperature was 320°C, and the influence of the reaction pressure on the performance of the catalyst was investigated. The results are shown in Table 2. From the data analysis, it can be seen that as the pressure increases, the CO 2 The conversion rate increases gradually, low carbon olefins (C 2 ＝ -C 4 ＝ ) and the olefin ratio (O / P) first increased and then decreased, and the optimal pressure was 2MPa.

Embodiment 3

[0047] Weigh the catalyst 1Na / Fe prepared in the method of embodiment 1 3 o 4 CO 2 Hydrogenation reaction performance evaluation.

[0048] Catalyst reduction conditions: the reducing gas is pure H 2 , purity>99.9%, space velocity is 1800h -1 , the heating rate is 5°C / min, the reduction temperature is 350°C, the pressure is normal pressure, and the reduction time is 12h.

[0049] CO 2 Reaction conditions for the reaction of hydrogenation to synthesize light olefins: molar ratio H 2 :CO 2 =3, the pressure is 2MPa, the temperature is 320°C, and the influence of the reaction space velocity on the catalyst performance is investigated, and the results are shown in Table 3. From the data analysis, it can be seen that with the increase of space velocity, the CO 2 The conversion rate decreases gradually, and the low carbon olefins (C 2 ＝ -C 4 ＝ ) The selectivity and olefin ratio (O / P) change little, and a higher yield of low-carbon olefins can be obtained at high space velo...

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Abstract

The invention relates to an iron-based catalyst for synthesizing a low-carbon olefin through carbon dioxide hydrogenation and a preparation method and application thereof. The direct hydrogenation conversion of carbon dioxide to the low-carbon olefin on a single catalyst is mainly realized, the high space-time yield is achieved, and the methane selectivity is low. The catalyst comprises the following components: a) iron element or an oxide thereof; b) one or more of oxides of lithium, sodium, potassium, rubidium and cesium; and c) one or more of oxides of manganese, cerium, zinc and copper. The catalyst can directly convert CO2 into the low-carbon olefin, the conversion rate of CO2 can reach to be more than 40%, the methane selectivity is less than 10%, the olefin-alkyl ratio reaches to be13, and the space-time yield of the low-carbon olefin can reach to be 380 mg / (g<cat>.h).

Description

technical field [0001] The invention relates to an iron-based catalyst for carbon dioxide hydrogenation to synthesize low-carbon olefins, a preparation method and application thereof. Background technique [0002] With the development of global industry, the consumption of global energy is increasing year by year. According to the statistics of BP Petroleum Company, fossil energy still accounted for 85.9% of the primary energy consumed globally in 2015. Extensive use of fossil energy makes CO 2 emissions are increasing year by year, resulting in atmospheric CO 2 content is also increasing year by year. Currently, atmospheric CO 2 The content has exceeded 400ppm. Atmospheric CO 2 The rise of the content has caused a series of environmental problems such as global warming and ocean acidification. Therefore, reducing CO 2 Emissions are crucial to slow down climate change and maintain ecological balance. Low-carbon olefins are the most basic raw materials in the chemica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/78B01J23/80B01J23/889B01J37/02B01J37/03B01J37/08B01J37/18C07C1/12C07C11/04C07C11/06C07C11/08
CPCY02P20/52
Inventor 黄延强梁兵连段洪敏王晓东王爱琴张涛
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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