CN104624194A - Method for preparing low-carbon olefin catalyst through carbon dioxide hydrogenation - Google Patents
Method for preparing low-carbon olefin catalyst through carbon dioxide hydrogenation Download PDFInfo
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- CN104624194A CN104624194A CN201510102620.0A CN201510102620A CN104624194A CN 104624194 A CN104624194 A CN 104624194A CN 201510102620 A CN201510102620 A CN 201510102620A CN 104624194 A CN104624194 A CN 104624194A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/52—Improvements relating to the production of bulk chemicals using catalysts, e.g. selective catalysts
Abstract
The invention relates to a method for preparing a low-carbon olefin catalyst through carbon dioxide hydrogenation. The low-carbon olefin catalyst comprises the following element components: iron, zirconium, potassium and oxygen, the atomic molar ratio of zirconium to iron is (0-1):1, and the atomic molar ratio of iron to potassium is 10:1. The method for preparing the low-carbon olefin catalyst through carbon dioxide hydrogenation comprises the following steps: (1) weighing an iron source and a zirconium sourse, preparing aqueous solution, and marking the prepared aqueous solution as solution A; (2) adding a precipitator into the solution A, stirring, and marking the obtained solution as solution B; (3) carrying out microwave induction on the solution B; (4) centrifuging, filtering and washing reaction products, drying and roasting the obtained sample, and marking the roasted sample as a sample C; (5) weighing a potassium source, dissolving the potassium source in deionized water, impregnating the sample C, drying, and marking the dried sample as a sample D; and (6) carrying out tabletting, pelletizing and hydrogen gas reduction on the sample D, so that a catalyst sample is obtained. The method for preparing the low-carbon olefin catalyst through the carbon dioxide hydrogenation has the advantages that conversion ratio of carbon dioxide raw material is high, selectivity of low-carbon olefin is high, few CH4 and CO byproducts are produced, the catalyst is stable, and powder particles of the obtained catalyst are small and uniform.
Description
Technical field
The present invention relates to the preparation field of catalyst, particularly a kind of preparation method of hydrogenation of carbon dioxide producing light olefins catalyst.
Background technology
Low-carbon alkene (ethene, propylene, butylene) is important Elementary Chemical Industry raw material, can be used for producing the products such as polyethylene, polypropylene, oxirane.Along with the day by day scarcity of petroleum resources, Non oil-based route producing light olefins comes into one's own.Journal of Molecular Catalysis (nineteen ninety-five, the 9th volume, the 1st phase, the 78th page-80 pages) reports Fe
3(CO)
12metal cluster catalyst is used for carbon dioxide hydrogenation reaction, and carbon dioxide conversion is 43.5%, and selectivity of light olefin is 98.4%.But catalysis preparation condition is harsh.Chemistry of fuel journal (1999,27th volume, the 2nd phase, 145-149 page) report the catalytic performance to carbon dioxide hydrogenation reaction under Fe-Co bimetallic catalyst condition of normal pressure prepared by coprecipitation, carbon dioxide conversion is 30%, and product is mainly methane and carbon monoxide.Patent Prospectus (CN102309967A) report a kind of precipitation method obtain with Fe
2o
3for matrix, SiO
2for structural promoter, Zn, Cu and K are the catalyst of chemical assistant, for carbon dioxide hydrogenation reaction under 230 DEG C of reaction temperature conditions, carbon dioxide conversion lower than 10%, in product methane and carbon monoxide content high.Patent prospectus (CN103349997A) reports a kind of composite membrane core-shell structure, in hydrogen/carbon dioxide=(1-6)/1, reaction temperature 200 DEG C ~ 500 DEG C, Feed space velocities 1000h
-1~ 10000h
-1under condition, carbon dioxide conversion is 30%, C
2~ C
4hydrocarbon selective is 20%.Applied Catalysis B:Environmental (2013,132-133 rolls up, 54-61 page) reports the porous molecular screen supported ferric catalyst of cryptomelane type at 260 DEG C, 13.7MPa, air speed 3360h
-1to the activity of carbon dioxide hydrogenation reaction under condition, carbon dioxide conversion is 45%, C
2~ C
6hydrocarbon-selective is 51.1%.But olefine selective is lower in product.Catalysis Today (the 2013,215th volume, 186-193 page) reports supported ferric catalyst prepared by infusion process for carbon dioxide hydrogenation reaction, and carbon dioxide conversion is 43%, selectivity of light olefin 44%, C
5above olefine selective is 19%, CO selective about 15%.
The preparation of current associated catalysts and there is the problems such as preparation poor repeatability, accessory substance is many, carbon dioxide conversion is low, and selectivity of light olefin is low in the application of hydrogenation of carbon dioxide reaction for preparing light olefins.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of preparation method of high activity hydrogenation of carbon dioxide reaction for preparing light olefins catalyst is provided.The method has the high and low carbon olefin of feed carbon dioxide conversion ratio (ethene, propylene, butylene) selective height, CH
4, low, the catalyst stabilization of CO by-product and little, the uniform advantage of catalyst powder grain diameter obtained.
Object of the present invention is achieved by following scheme:
A preparation method for hydrogenation of carbon dioxide producing light olefins catalyst, catalyst component is iron, zirconium, potassium, oxygen, constituent content in atomic molar than zirconium/iron be 0 ~ 1:1, iron/potassium comprises the steps: for 10:1, preparation method
(1) by the atomic molar proportioning of component iron, zirconium, take source of iron and zirconium source, be configured to the aqueous solution, be designated as solution A;
(2) precipitating reagent is joined in solution A, stir, be designated as B solution;
(3) B solution is carried out microwave induced;
(4) product is through centrifugal, filtration, washing, and dry, powder sample that roasting obtains is designated as C;
(5) take potassium source, be dissolved in deionized water, be impregnated into sample C, dry, the sample that obtains is designated as D;
(6) sample D obtains catalyst sample after compressing tablet granulation, hydrogen reducing;
The concentration of aqueous solution that above-mentioned steps (1) is prepared is 0.5 ~ 1mol/L;
Described in above-mentioned steps (2), precipitating reagent is urea;
Above-mentioned is 6 ~ 9:1 by urea/metal molar ratio, is joined by required urea in 200mL solution A, stirs 30 minutes;
In above-mentioned steps (3), B solution is at microwave frequency 2450MHz, power output 500W, and reaction pressure 1.6MPa, under reaction temperature 170 ~ 180 DEG C of conditions; React 1 ~ 3 hour;
Product is through centrifugation, filtration, washing in above-mentioned steps (4), gained filter cake in 120 DEG C of dryings 12 hours, 400 ~ 600 DEG C of roastings 4 hours, the powder sample that obtains is designated as C;
Press the atomic molar proportioning of elemental iron, potassium in above-mentioned steps (5), take potassium source, be dissolved in deionized water, incipient impregnation to sample C, 120 DEG C of dryings 12 hours, the sample that obtains is designated as D;
In above-mentioned steps (6), sample D makes particle through compressing tablet granulation is 20 ~ 40 orders;
Reducing condition in above-mentioned steps (6) is: temperature 400 DEG C, normal pressure, be 30% hydrogen at volume fraction content, air speed 1000h
-1under condition, reduction treatment 8 hours.
Beneficial effect of the present invention:
The present invention program is mainly through adopting microwave induced-homogeneous precipitation preparation process, precipitating reagent slowly discharges hydroxyl equably under the reaction condition of setting, to react within a short period of time with iron, zirconium metal ion and the transient temperature of heating using microwave can reach 170 ~ 180 DEG C, temperature is high, nucleus is formed soon, the nucleus number generated is many, nucleus formation speed is greater than grain growth speed, the catalyst powder grain diameter obtained is little, even, and the method has the high and low carbon olefin of feed carbon dioxide conversion ratio (ethene, propylene, butylene) selective height, CH
4, CO by-product is low, catalyst stabilization, granular size are controlled, reproducible, to hydrogenation of carbon dioxide select generate low-carbon alkene reaction there is high activity.
Accompanying drawing explanation
Fig. 1 is the microscopic appearance of the catalyst sample 2 of the preparation method of a kind of hydrogenation of carbon dioxide producing light olefins of the present invention catalyst
Detailed description of the invention
By reference to the accompanying drawings technical scheme of the present invention is described further by the following examples:
Embodiment 1
Take 40.4g Fe (NO
3)
39H
2o and 54.0g urea is mixed with 200mL homogeneous mixture solotion, and wherein urea/Fe mol ratio is 9, proceeds to molten sample cup, at microwave 2450MHz, power 500W, 1.6MPa, heat 2 hours, be down to room temperature, filtration, washing precipitation are extremely neutral, in 120 DEG C of dryings 12 hours, and 400 DEG C of roasting 4h.Take 0.60g K
2cO
3, be dissolved in 4mL deionized water, be impregnated into the above-mentioned sample of 7g, 120 DEG C of dryings 12 hours, 20 ~ 40 order granulations, obtain catalyst sample 1, and wherein zirconium/iron is 0.Temperature 400 DEG C, under condition of normal pressure, be 1000h by air speed
-130%H
2reducing catalyst sample 8 hours.Then hydrogenation of carbon dioxide unstripped gas (H is switched to
2/ CO
2=3, air speed=1000h
-1), react 100 hours under temperature 320 DEG C, pressure 2MPa condition.The results are shown in Table 1.
Embodiment 2
Take 40.4g Fe (NO
3)
39H
2o, 3.82g ZrO (NO
3)
22H
2o and 54.8g urea is mixed with 200mL homogeneous mixture solotion, and wherein urea/(Fe+Zr) mol ratio is 8, at microwave 2450MHz, heat 2 hours under power 500W, 1.6MPa condition, be down to room temperature, filter, washing precipitation to neutral, 120 DEG C of dryings 12 hours, 500 DEG C of roasting 4h.Take 0.49g K
2cO
3, be dissolved in 4mL deionized water, be impregnated into the above-mentioned sample of 7g, 120 DEG C of dryings 12 hours, 20 ~ 40 order granulations, obtain catalyst sample 2, and wherein zirconium/iron is 1:7.Temperature 400 DEG C, under condition of normal pressure, be 1000h by air speed
-130%H
2reducing catalyst sample 8 hours.Then hydrogenation of carbon dioxide unstripped gas (H is switched to
2/ CO
2=3, air speed=1000h
-1), react 100 hours under temperature 320 DEG C, pressure 2MPa condition.The results are shown in Table 1.
Embodiment 3
Take 40.4g Fe (NO
3)
39H
2o, 5.34g ZrO (NO
3)
22H
2o and 43.7g urea is mixed with 200mL homogeneous mixture solotion, wherein urea/(Fe+Zr) mol ratio is 6, proceed to molten sample cup, at microwave 2450MHz, heat 2 hours under power 500W, 1.6MPa condition, be down to room temperature, filter, washing precipitation to neutral, 120 DEG C of dryings 12 hours, 500 DEG C of roasting 4h.Take 0.46g K
2cO
3, be dissolved in 4mL deionized water, be impregnated into the above-mentioned sample of 7g, 120 DEG C of dryings 12 hours, 20 ~ 40 order granulations, obtain catalyst sample 3, and wherein zirconium/iron is 1:5.Temperature 400 DEG C, under condition of normal pressure, be 1000h by air speed
-130%H
2reducing catalyst sample 8 hours.Then hydrogenation of carbon dioxide unstripped gas (H is switched to
2/ CO
2=3, air speed=1000h
-1), react 100 hours under temperature 320 DEG C, pressure 2MPa condition.The results are shown in Table 1.
Embodiment 4
Take 40.4g Fe (NO
3)
39H
2o, 5.34g ZrO (NO
3)
22H
2o and 43.7g urea is mixed with 200mL homogeneous mixture solotion, wherein urea/(Fe+Zr) mol ratio is 6, proceed to molten sample cup, at microwave 2450MHz, heat 2 hours under power 500W, 1.6MPa condition, be down to room temperature, filter, washing precipitation to neutral, 120 DEG C of dryings 12 hours, 500 DEG C of roasting 4h.Take 0.46g K
2cO
3, be dissolved in 4mL deionized water, be impregnated into the above-mentioned sample of 7g, 120 DEG C of dryings 12 hours, 20 ~ 40 order granulations, obtain catalyst sample 4, and wherein zirconium/iron is 1:5.Temperature 400 DEG C, under condition of normal pressure, be 1000h by air speed
-130%H
2reducing catalyst sample 8 hours.Then hydrogenation of carbon dioxide unstripped gas (H is switched to
2/ CO
2=3, air speed=1000h
-1), react 100 hours under temperature 400 DEG C, pressure 2MPa condition.The results are shown in Table 1.
Embodiment 5
Take 40.4g Fe (NO
3)
39H
2o, 5.34g ZrO (NO
3)
22H
2o and 43.7g urea is mixed with 200mL homogeneous mixture solotion, and wherein urea/(Fe+Zr) mol ratio is 6, at microwave 2450MHz, heat 2 hours under power 500W, 1.6MPa condition, be down to room temperature, filter, washing precipitation to neutral, 120 DEG C of dryings 12 hours, 500 DEG C of roasting 4h.Take 0.46g K
2cO
3, be dissolved in 4mL deionized water, be impregnated into the above-mentioned sample of 7g, 120 DEG C of dryings 12 hours, 20 ~ 40 order granulations, obtain catalyst sample 5, and wherein zirconium/iron is 1:5.Temperature 400 DEG C, under condition of normal pressure, be 1000h by air speed
-130%H
2reducing catalyst sample 8 hours.Then hydrogenation of carbon dioxide unstripped gas (H is switched to
2/ CO
2=3, air speed=3000h
-1), react 100 hours under temperature 320 DEG C, pressure 2MPa condition.The results are shown in Table 1.
Embodiment 6
Take 40.4g Fe (NO
3)
39H
2o, 8.91g ZrO (NO
3)
22H
2o and 64.0g urea is mixed with 200mL homogeneous mixture solotion, wherein urea/(Fe+Zr) mol ratio is 8, proceed to molten sample cup, at microwave 2450MHz, heat 2 hours under power 500W, 1.6MPa condition, be down to room temperature, filter, washing precipitation to neutral, 120 DEG C of dryings 12 hours, 550 DEG C of roasting 4h.Take 0.40g K
2cO
3, be dissolved in 4mL deionized water, be impregnated into the above-mentioned sample of 7g, 120 DEG C of dryings 12 hours, 20 ~ 40 order granulations, obtain catalyst sample 6, and wherein zirconium/iron is 1:3.Temperature 400 DEG C, under condition of normal pressure, be 1000h by air speed
-130%H
2reducing catalyst sample 8 hours.Then hydrogenation of carbon dioxide unstripped gas (H is switched to
2/ CO
2=3, air speed=1000h
-1), react 100 hours under temperature 320 DEG C, pressure 2MPa condition.The results are shown in Table 1.
Embodiment 7
Take 40.4g Fe (NO3) 39H2O, 26.72g ZrO (NO3) 22H2O and 72.0g urea and be mixed with 200mL homogeneous mixture solotion, wherein urea/(Fe+Zr) mol ratio is 6, proceed to molten sample cup, at microwave 2450MHz, heat 2 hours under power 500W, 1.6MPa condition, be down to room temperature, filter, washing precipitation to neutral, 120 DEG C of dryings 12 hours, 500 DEG C of roasting 4h.Take 0.24g K2CO3, be dissolved in 4mL deionized water, be impregnated into the above-mentioned sample of 7g, 120 DEG C of dryings 12 hours, 20 ~ 40 order granulations, obtain catalyst sample 7, and wherein zirconium/iron is 1:1.Temperature 400 DEG C, under condition of normal pressure, be the 30%H2 reducing catalyst sample 8 hours of 1000h-1 by air speed.Then switch to hydrogenation of carbon dioxide unstripped gas (H2/CO2=3, air speed=1000h-1), react 100 hours under temperature 320 DEG C, pressure 2MPa condition.The results are shown in Table 1.
The hydrogenation of carbon dioxide producing light olefins of table 1 catalyst sample is active
Claims (9)
1. a preparation method for hydrogenation of carbon dioxide producing light olefins catalyst, catalyst component is iron, zirconium, potassium, oxygen, constituent content in atomic molar than zirconium/iron be 0 ~ 1:1, iron/potassium comprises the steps: for 10:1, preparation method
(1) by the atomic molar proportioning of component iron, zirconium, take source of iron and zirconium source, be configured to the aqueous solution, be designated as solution A;
(2) precipitating reagent is joined in solution A, stir, be designated as B solution;
(3) B solution is carried out microwave induced;
(4) product is through centrifugation, filtration, washing, and dry, powder sample that roasting obtains is designated as C;
(5) take potassium source, be dissolved in deionized water, be impregnated into sample C, dry, the sample that obtains is designated as D;
(6) sample D obtains catalyst sample after compressing tablet granulation, hydrogen reducing.
2. the preparation method of hydrogenation of carbon dioxide producing light olefins catalyst as claimed in claim 1, it is characterized in that, the concentration of aqueous solution that step (1) is prepared is 0.5 ~ 1mol/L.
3. the preparation method of hydrogenation of carbon dioxide producing light olefins catalyst as claimed in claim 1 or 2, it is characterized in that, described in step (2), precipitating reagent is urea.
4. the preparation method of hydrogenation of carbon dioxide producing light olefins catalyst as claimed in claim 3, is characterized in that, be 6 ~ 9:1, joined by required urea in 200mL solution A by urea/metal molar ratio, stir 30 minutes.
5. the preparation method of hydrogenation of carbon dioxide producing light olefins catalyst as claimed in claim 1, it is characterized in that, in step (3), B solution is at microwave frequency 2450MHz, power output 500W, reaction pressure 1.6MPa, under reaction temperature 170 ~ 180 DEG C of conditions, react 1 ~ 3 hour.
6. the preparation method of hydrogenation of carbon dioxide producing light olefins catalyst as claimed in claim 1, it is characterized in that, in step (4), product is through centrifugation, filtration, washing, gained filter cake was in 120 DEG C of dryings 12 hours, 400 ~ 600 DEG C of roastings 4 hours, the powder sample that obtains is designated as C.
7. the preparation method of hydrogenation of carbon dioxide producing light olefins catalyst as claimed in claim 1, it is characterized in that, the atomic molar proportioning of elemental iron, potassium is pressed in step (5), take potassium source, be dissolved in deionized water, incipient impregnation is to sample C, and 120 DEG C of dryings 12 hours, the sample that obtains is designated as D.
8. the preparation method of hydrogenation of carbon dioxide producing light olefins catalyst as claimed in claim 1, is characterized in that, in step (6), sample D makes particle through compressing tablet granulation is 20 ~ 40 orders.
9. the preparation method of the hydrogenation of carbon dioxide producing light olefins catalyst as described in claim 1 ~ 8 any one, it is characterized in that, reducing condition in step (6) is: temperature 400 DEG C, normal pressure, be 30% hydrogen at volume fraction content, air speed 1000h
-1under condition, reduction treatment 8 hours.
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| CN112121815A (en) * | 2020-10-19 | 2020-12-25 | 宁夏大学 | For CO2Hydrogenated perovskite catalyst and application |
| CN112121804A (en) * | 2020-10-19 | 2020-12-25 | 宁夏大学 | CO hydrogenation iron-based catalyst and preparation method thereof |
| CN113797955A (en) * | 2021-10-25 | 2021-12-17 | 中国华能集团清洁能源技术研究院有限公司 | Catalyst for preparing low-carbon olefin by carbon dioxide hydrogenation and preparation method thereof |
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