WO2018040798A1 - 费托合成单分散铁基催化剂及其制备方法和应用 - Google Patents
费托合成单分散铁基催化剂及其制备方法和应用 Download PDFInfo
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- WO2018040798A1 WO2018040798A1 PCT/CN2017/094223 CN2017094223W WO2018040798A1 WO 2018040798 A1 WO2018040798 A1 WO 2018040798A1 CN 2017094223 W CN2017094223 W CN 2017094223W WO 2018040798 A1 WO2018040798 A1 WO 2018040798A1
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- Prior art keywords
- iron
- fischer
- based catalyst
- tropsch synthesis
- reaction
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- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
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- C10G2/332—Production of liquid hydrocarbon mixtures of undefined composition from oxides of carbon from carbon monoxide with hydrogen with the use of catalysts characterised by the catalyst used containing group VIII-metals of the iron-group
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C2521/00—Catalysts comprising the elements, oxides or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium or hafnium
- C07C2521/06—Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof
- C07C2521/08—Silica
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C2523/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group C07C2521/00
- C07C2523/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group C07C2521/00 of the iron group metals or copper
- C07C2523/74—Iron group metals
- C07C2523/745—Iron
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G2300/00—Aspects relating to hydrocarbon processing covered by groups C10G1/00 - C10G99/00
- C10G2300/70—Catalyst aspects
Definitions
- the invention relates to the field of Fischer-Tropsch synthesis, in particular to a Fischer-Tropsch synthesis monodisperse iron-based catalyst and a preparation method and application thereof.
- the long-chain ⁇ -olefin refers to a monoolefin or a mixed olefin having an unsaturated bond at a carbon terminal position of a chain hydrocarbon terminal or more and a carbon number of 16 or less. Due to the active sites (olefinic bonds) in the molecule, ⁇ -olefins are easily incorporated into various functional groups and derivatized into compounds such as alcohols, acids and esters, and are widely used in the production of fine chemicals such as surfactants and plasticizers.
- ⁇ -olefins are mainly used as comonomers for the production of polyethylene, accounting for 44.1% of the total consumption.
- the most widely used varieties for comonomers are C 4 (1-butene) and C 6 (1-hexene).
- C 8 (1-octene) the use of these comonomers in the production of high density polyethylene and linear low density polyethylene (HDPE / LLDPE) can improve PE density and increase its tear and tensile strength.
- ⁇ -olefins are also used to produce high-carbon alcohols.
- the final products are plasticizers and detergents, accounting for 19.6% of the total consumption.
- High-carbon alcohols are the basic raw materials for surfactants and plasticizers.
- ⁇ -olefins are also used in the production of polyalphaolefins (PAO), which account for 16.6% of total consumption.
- PAO polyalphaolefins
- PAO is a raw material for high-end lubricant base oils with a high viscosity index and a price 2-3 times that of mineral oil.
- ⁇ -olefins are also used as chemical raw materials such as emulsifiers, leather treatment agents, lubricating oil additives, rust inhibitors, fabric finishing agents, and paper.
- the total production capacity of foreign alpha-olefins is about 2.12 million tons, and the domestic production capacity is about 260,000 tons.
- domestic lack of ability to produce long-chain alpha-olefins, 1-octene and 1-hexene are almost completely dependent on imports.
- paraffin cracking or ethylene oligomerization.
- the paraffin cracking method generally uses deoiled refined wax as raw material, the raw material wax is preheated and mixed with steam, and reacted at 550 ° C in a tubular cracking furnace; ethylene oligomerization produces ⁇ -olefin, and ethylene oligomerization reaction Under the action of triethylaluminum catalyst, ethylene undergoes controlled chain growth reaction and is polymerized into a certain chain length of olefin. Specifically, it can be divided into two-step method, one-step method and SHOP process.
- This traditional alpha-olefin production process is based on wax or ethylene, and the raw material is derived from petroleum. With the shrinking of oil and gas resources worldwide, this production process is in urgent need of transformation. Therefore, diversification of energy raw materials is being carried out at home and abroad, and non-oil routes in which coal, biomass or natural gas are indirectly converted into clean liquid fuels and chemicals through syngas are receiving increasing attention.
- olefin preparation techniques are roughly classified into the following types according to the differences in core technology routes.
- the method for preparing light olefins from methanol or dimethyl ether disclosed by the Chinese patent application CN101265151A the methanol or dimethyl ether raw materials are fed into the reaction zone of the reactor through the feed distributor, and are contacted with the molecular sieve catalyst.
- a mixture comprising light olefins, diolefins, oxygenates, and carbon tetrahydrocarbons is formed.
- the second type is an iron/activated carbon catalyst which is directly represented by the Chinese patent application CN101265149A and CN1537674A, and which is prepared by reacting ethylene, propylene and butene directly from the synthesis gas, and is characterized by the specific chemical composition of the self-made catalyst.
- the Chinese patent application CN1403425A and CN1421424A represent a method and a device for preparing a high-carbon ⁇ -olefin from a wax cracking ⁇ -olefin or a high-carbon aluminum alkyl.
- a fifth method for producing self-supporting precipitated iron catalyst particles for use in a Fischer-Tropsch slurry bed process is disclosed by the Chinese patent application CN1284898A and CN1515359A.
- ⁇ -olefin preparation techniques in addition to the conventional method, which relies on a preparation method of increasingly shrinking petroleum raw materials, there is another type which is realized by Fischer-Tropsch synthesis, which is coal, natural gas and petroleum coke. And a technology for converting syngas (CO/H 2 ) produced from other carbonaceous feedstocks into high-quality clean energy.
- the Fischer-Tropsch reaction is a complex process involving alkane, olefins, aldehydes, alcohols and organic acids. An organic compound.
- Iron-based catalysts are often used in the preparation of ⁇ -olefins by Fischer-Tropsch synthesis. However, existing iron-based catalysts tend to aggregate and grow during the reaction, resulting in reduced catalyst activity, catalyst stability and long chain. The selectivity of the ⁇ -olefin is not high.
- An object of the present invention is to provide a Fischer-Tropsch synthesis monodisperse iron-based catalyst which is excellent in performance and high in selectivity of long-chain ⁇ -olefins, and a preparation method and application thereof.
- the technical scheme adopted by the present invention is: a Fischer-Tropsch synthesis monodisperse iron-based catalyst comprising a carrier silica and an active component iron, characterized in that the carrier silica is mesoporous spherical particles. a structure in which the carrier silica encapsulates the active component iron, the active component iron is in the form of nanoparticles and is uniformly distributed; the carrier silica particles have a particle diameter of 140 to 160 nm, and the carrier silica The mesopore diameter is 2 to 9 nm.
- the active component iron accounts for 5 to 40% by weight of the total catalyst, and the balance is carrier silica.
- the carrier silica particles have a particle diameter of 150 to 160 nm, and the carrier silica has a mesoporous pore diameter of 2.1 to 5.7 nm.
- the carrier silica particles have a particle diameter of 150 to 155 nm, and the carrier silica has a mesoporous pore diameter of 3.3 to 4.1 nm.
- a preparation method of the above Fischer-Tropsch synthesis monodisperse iron-based catalyst comprising the following steps:
- step 3 Passing 1 to 15 MPa of CO 2 to the product obtained in step 2) and raising the temperature to 35 to 45 ° C for chemical reaction. After the reaction is completed, cooling and releasing CO 2 ;
- step 3 is carried out in an autoclave, and 6 to 9 MPa of CO 2 is introduced and the temperature is raised to 40 to 45 ° C, and the reaction is stirred for 22 to 26 hours.
- the baking temperature is 500 to 560 ° C, and the baking time is 4.5 to 5.5 h.
- the iron nanoparticles are added in an amount of 5 to 40% by weight of the iron.
- Fischer-Tropsch synthesis monodisperse iron-based catalyst wherein the Fischer-Tropsch synthesis monodisperse iron-based catalyst is used for synthesizing ⁇ -olefin from a synthesis gas, and the Fischer-Tropsch synthesis reaction condition is: a reaction temperature of 190 ⁇ 360°C, the reaction pressure is 0.5-5.0 MPa, the air volume of the intake air is 400 to 20000 h -1 , the stirring speed is 400-1400 rpm, and the volume ratio of H 2 to CO feed is 1:1 to 3:1.
- the reduction conditions of the Fischer-Tropsch synthesis monodisperse iron-based catalyst are: a reduction temperature of 300 to 500 ° C, a reduction pressure of 0.2 to 1.2 MPa, a stirring rotation speed of 400 to 1400 rpm, and an inlet volumetric space velocity of 400 to 3500 h. -1 , reaction time is 6-18 h, pure hydrogen or synthetic atmosphere.
- the present invention has the following advantages:
- the iron-based catalyst of the present invention has a uniform pore size and uniformity of iron nanoparticles, so that the degree of reduction and the degree of carbonization of the catalyst are easily regulated; the uniform spherical silica carrier encapsulates the iron nanoparticles in a spherical shape.
- the inside of the silica prevents the sintering of the iron nanoparticles and also avoids the appearance of difficult-reducing components, so that the iron-based catalyst of the present invention has excellent properties, and the long-chain ⁇ -olefin has high selectivity; and is encapsulated in mesoporous spherical silica. Iron nanoparticles are evenly distributed.
- This structure makes the iron catalytically active center more consistent and facilitates the construction of the active center.
- the larger mesopores facilitate the diffusion of the substrate and product molecules, and the size of the pores regulates the selectivity of the product. Used to further improve the ⁇ -olefin selectivity of the iron-based catalyst.
- the use of compressed CO 2 in the preparation of the iron-based catalyst of the present invention induces the formation of a water-carbon dioxide-containing microemulsion system as a template for synthesizing a core-shell structure, and the morphology of the catalyst obtained by the present invention passes through CO 2 compared with the conventional method.
- the pressure is regulated, and the introduction of CO 2 can also act as a pore-expanding effect, eliminating the acid, alkali and organic pore-expanding agent in the conventional preparation method; the invention adjusts the morphology of the catalyst from the disc by adjusting the pressure of CO 2
- the shape of the deposit becomes a uniform spherical shape, thereby encapsulating the iron nanoparticles inside the spherical silica, preventing the sintering of the iron nanoparticles and avoiding the occurrence of difficult-reducing components, thereby improving the activity of the catalyst and the selectivity of the ⁇ -olefin. .
- the iron-based catalyst prepared by the invention can be formed by powder tableting or spray drying, and has good mechanical properties.
- the monodisperse structural characteristics of the catalyst of the present invention and suitable metal-support chemistry allow the iron-based catalyst to produce an active center suitable for alpha-olefin formation and thus have high alpha-olefin selectivity; the present invention provides a A new process for the production of ⁇ -olefins, which synthesizes ⁇ -olefins directly under the action of the iron-based catalyst of the present invention using synthesis gas as a raw material.
- the invention turns waste into treasure, applies CO 2 to catalyze the preparation of new materials, uses carbon dioxide as a control switch, reduces the use of inorganic mineral acid, carries out green synthesis of the catalyst, and gives new use of CO 2 .
- Fig. 1 is a SEM photograph of the structure of an iron-based catalyst in which the pressure of CO 2 or CO 2 was not charged in Example 1.
- Example 2 is a SEM photograph of the structure of a Fischer-Tropsch synthesis monodisperse iron-based catalyst in Example 1.
- Figure 3 is a TEM photograph of the structure of a Fischer-Tropsch synthesis monodisperse iron-based catalyst in Example 1.
- the mixture was calcined at 540 ° C for 5.5 h; finally, the tablet was sieved to obtain a Fischer-Tropsch synthesis monodisperse iron-based catalyst (20 wt% Fe@SiO 2 -CO 2 -6) having an iron content of 20 wt%, and the particle size of the supported silica particles was At 160 nm, the supported silica has a mesoporous pore diameter of 4.6 ⁇ 0.4 nm.
- the furnace was calcined at 500 ° C for 5 h; finally tableted and sieved to obtain a Fischer-Tropsch synthesis monodisperse iron-based catalyst (20 wt% Fe@SiO 2 -CO 2 -4 ) having an iron content of 20 wt%, and the particle size of the supported silica particles At 145 nm, the mesoporous pore diameter of the supported silica was 3.7 ⁇ 0.4 nm.
- the Fe content in the iron-based catalysts of Examples 6 to 10 and Example 5 were the same except that the CO 2 pressure, the reaction temperature, and the inlet volume air velocity were different during the preparation.
- the Fe content and the CO 2 pressure during the preparation are shown in Table 1 below; the reaction temperature, the inlet volume velocity and the reaction results are shown in Table 2 below.
- the Fe content in the iron-based catalysts obtained in Examples 1 to 10 and the pressure of CO 2 in the preparation process are shown in Table 1 below. With the exception of the listed components, the remaining components are silica.
- Example Fe content (wt%) CO 2 pressure (MPa) Example 1 20% 1 Example 2 20% 4 Example 3 20% 6 Example 4 20% 9 Example 5 20% 4 Example 6 10% 4 Example 7 10% 1 Example 8 30% 4 Example 9 30% 1 Example 10 40% 4
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Abstract
Description
实施例 | Fe含量(wt%) | CO2压力(MPa) |
实施例1 | 20% | 1 |
实施例2 | 20% | 4 |
实施例3 | 20% | 6 |
实施例4 | 20% | 9 |
实施例5 | 20% | 4 |
实施例6 | 10% | 4 |
实施例7 | 10% | 1 |
实施例8 | 30% | 4 |
实施例9 | 30% | 1 |
实施例10 | 40% | 4 |
Claims (10)
- 一种费托合成单分散铁基催化剂,包括载体二氧化硅和活性组分铁,其特征在于:所述载体二氧化硅呈介孔球状颗粒结构,所述载体二氧化硅包裹所述活性组分铁,所述活性组分铁呈纳米颗粒状且分布均匀;所述载体二氧化硅颗粒粒径为140~160nm,所述载体二氧化硅的介孔孔径为2~9nm。
- 根据权利要求1所述的费托合成单分散铁基催化剂,其特征在于:所述活性组分铁占催化剂总重量的5~40%,其余为载体二氧化硅。
- 根据权利要求1或2所述的费托合成单分散铁基催化剂,其特征在于:所述载体二氧化硅颗粒粒径为150~160nm,所述载体二氧化硅的介孔孔径为2.1~5.7nm。
- 根据权利要求1或2所述的费托合成单分散铁基催化剂,其特征在于:所述载体二氧化硅颗粒粒径为150~155nm,所述载体二氧化硅的介孔孔径为3.3~4.1nm。
- 一种权利要求1所述费托合成单分散铁基催化剂的制备方法,包括以下步骤:1)将乙醇与水按1~10∶1~10的体积比混合制得乙醇水溶液,首先在所述乙醇水溶液中加入0.005~0.02g/ml的有机胺混合均匀,制得混合溶液;2)然后向步骤1)所得混合溶液中加入铁纳米粒,并滴加0.05~0.2g/ml的正硅酸四乙酯;3)再向步骤2)所得产物中通入1~15MPa的CO2并升温至35~45℃进行化学反应,待反应结束后,冷却并放出CO2;4)将步骤3)所得固体产物水洗干燥后进行高温焙烧,即可得到所述费托合成单分散铁基催化剂。
- 根据权利要求5所述的费托合成单分散铁基催化剂的制备方法,其特征在于:所述步骤3)中,在高压反应釜中进行,通入6~9MPa的CO2并升温至40~45℃,搅拌反应22~26h。
- 根据权利要求5或6所述的费托合成单分散铁基催化剂的制备方法,其特征在于:所述步骤4)中,焙烧温度为500~560℃,焙烧时间为4.5~5.5h。
- 根据权利要求5或6所述的费托合成单分散铁基催化剂的制备方法,其特征在于:所述步骤2)中,铁纳米粒按铁的负载量为5~40wt%加入。
- 一种权利要求1所述费托合成单分散铁基催化剂的应用,其特征在于:将所述费托合成单分散铁基催化剂用于以合成气为原料费托合成α-烯烃,费托合成反应条件为:反应温度为190~360℃,反应压力为0.5~5.0MPa,进气体积空速为400~20000h-1,搅拌转速为400~1400rpm,H2与CO进料体积比为11~3∶1。
- 根据权利要求9所述的费托合成单分散铁基催化剂的应用,其特征在于:所述费托合成单分散铁基催化剂的还原条件为:还原温度为300~500℃,还原压力为0.2~1.2MPa,搅拌转速为400~1400rpm,进气体积空速为400~3500h-1,反应时间为6~18h,纯氢气或合成气氛。
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CA3035580A CA3035580A1 (en) | 2016-08-31 | 2017-07-25 | Monodispersed iron-based catalyst for fischer-tropsch process, preparation method therefor and use thereof |
JP2019511764A JP2019528173A (ja) | 2016-08-31 | 2017-07-25 | フィッシャートロプシュ合成のための単分散鉄系触媒、その調製方法およびその使用 |
EP17845100.1A EP3508271A4 (en) | 2016-08-31 | 2017-07-25 | MONODISPERGED IRON-BASED CATALYST FOR FISCHER-TROPSCH METHODS, PRODUCTION METHODS THEREFOR AND USE THEREOF |
KR1020197009290A KR20190042704A (ko) | 2016-08-31 | 2017-07-25 | 피셔-트롭쉬법을 위해 단분산된 철-계 촉매, 및 그 제조 방법 및 용도 |
AU2017319681A AU2017319681A1 (en) | 2016-08-31 | 2017-07-25 | Monodispersed iron-based catalyst for Fischer-Tropsch process, preparation method therefor and use thereof |
US16/288,063 US20190193064A1 (en) | 2016-08-31 | 2019-02-27 | Iron-based catalyst for fischer-tropsch synthesis, method of preparing the same and method of using the same |
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CN108176406A (zh) * | 2017-11-27 | 2018-06-19 | 贵州理工学院 | 尺寸和壳层厚度可调的单核双壳Fe2O3@SiO2@MnO2及制备方法 |
KR102096308B1 (ko) * | 2018-05-30 | 2020-04-02 | 한국화학연구원 | 선형 장쇄올레핀 제조용 피셔―트롭쉬 합성반응 촉매 및 이를 이용한 선형 장쇄올레핀의 제조방법 |
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- 2017-07-25 JP JP2019511764A patent/JP2019528173A/ja active Pending
- 2017-07-25 CA CA3035580A patent/CA3035580A1/en not_active Abandoned
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US20190193064A1 (en) | 2019-06-27 |
JP2019528173A (ja) | 2019-10-10 |
KR20190042704A (ko) | 2019-04-24 |
EP3508271A1 (en) | 2019-07-10 |
EP3508271A4 (en) | 2020-06-03 |
CN106391016A (zh) | 2017-02-15 |
AU2017319681A1 (en) | 2019-04-18 |
CA3035580A1 (en) | 2018-03-08 |
CN106391016B (zh) | 2019-03-19 |
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