WO2015161701A1 - 介孔材料包覆式钴基费托合成催化剂及其制备方法 - Google Patents
介孔材料包覆式钴基费托合成催化剂及其制备方法 Download PDFInfo
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- WO2015161701A1 WO2015161701A1 PCT/CN2015/072402 CN2015072402W WO2015161701A1 WO 2015161701 A1 WO2015161701 A1 WO 2015161701A1 CN 2015072402 W CN2015072402 W CN 2015072402W WO 2015161701 A1 WO2015161701 A1 WO 2015161701A1
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- WIPO (PCT)
- Prior art keywords
- mesoporous material
- cobalt
- tropsch synthesis
- synthesis catalyst
- based fischer
- Prior art date
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- 239000003054 catalyst Substances 0.000 title claims abstract description 187
- 239000013335 mesoporous material Substances 0.000 title claims abstract description 102
- 229910017052 cobalt Inorganic materials 0.000 title claims abstract description 83
- 239000010941 cobalt Substances 0.000 title claims abstract description 83
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 title claims abstract description 83
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 62
- 239000011148 porous material Substances 0.000 claims abstract description 48
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims abstract description 27
- 229910052726 zirconium Inorganic materials 0.000 claims abstract description 27
- 239000002243 precursor Substances 0.000 claims abstract description 19
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- 239000003795 chemical substances by application Substances 0.000 claims description 7
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- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 claims description 6
- 239000003960 organic solvent Substances 0.000 claims description 6
- 239000005051 trimethylchlorosilane Substances 0.000 claims description 6
- OERNJTNJEZOPIA-UHFFFAOYSA-N zirconium nitrate Chemical compound [Zr+4].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O OERNJTNJEZOPIA-UHFFFAOYSA-N 0.000 claims description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 5
- 239000008367 deionised water Substances 0.000 claims description 5
- 229910021641 deionized water Inorganic materials 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 4
- 150000001868 cobalt Chemical class 0.000 claims description 4
- 150000003754 zirconium Chemical class 0.000 claims description 4
- 239000012752 auxiliary agent Substances 0.000 claims description 3
- UFMZWBIQTDUYBN-UHFFFAOYSA-N cobalt dinitrate Chemical compound [Co+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O UFMZWBIQTDUYBN-UHFFFAOYSA-N 0.000 claims description 3
- 229910001981 cobalt nitrate Inorganic materials 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- UJVRJBAUJYZFIX-UHFFFAOYSA-N nitric acid;oxozirconium Chemical compound [Zr]=O.O[N+]([O-])=O.O[N+]([O-])=O UJVRJBAUJYZFIX-UHFFFAOYSA-N 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims description 2
- 229910021446 cobalt carbonate Inorganic materials 0.000 claims description 2
- ZOTKGJBKKKVBJZ-UHFFFAOYSA-L cobalt(2+);carbonate Chemical compound [Co+2].[O-]C([O-])=O ZOTKGJBKKKVBJZ-UHFFFAOYSA-L 0.000 claims description 2
- 230000007935 neutral effect Effects 0.000 claims description 2
- 229910021529 ammonia Inorganic materials 0.000 claims 1
- NBXZNTLFQLUFES-UHFFFAOYSA-N triethoxy(propyl)silane Chemical compound CCC[Si](OCC)(OCC)OCC NBXZNTLFQLUFES-UHFFFAOYSA-N 0.000 claims 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 12
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- 239000000203 mixture Substances 0.000 description 10
- WYTZZXDRDKSJID-UHFFFAOYSA-N (3-aminopropyl)triethoxysilane Chemical compound CCO[Si](OCC)(OCC)CCCN WYTZZXDRDKSJID-UHFFFAOYSA-N 0.000 description 7
- 239000007788 liquid Substances 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 5
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
- B01J21/06—Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof
- B01J21/066—Zirconium or hafnium; Oxides or hydroxides thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2229/00—Aspects of molecular sieve catalysts not covered by B01J29/00
- B01J2229/10—After treatment, characterised by the effect to be obtained
- B01J2229/12—After treatment, characterised by the effect to be obtained to alter the outside of the crystallites, e.g. selectivation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2229/00—Aspects of molecular sieve catalysts not covered by B01J29/00
- B01J2229/30—After treatment, characterised by the means used
- B01J2229/32—Reaction with silicon compounds, e.g. TEOS, siliconfluoride
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J33/00—Protection of catalysts, e.g. by coating
Definitions
- the invention belongs to the field of industrial catalytic Fischer-Tropsch synthesis, and in particular to a mesoporous material coated cobalt-based Fischer-Tropsch synthesis catalyst and a preparation method thereof.
- the basic reaction of Fischer-Tropsch synthesis is: CO + 2H 2 ⁇ (-CH 2 -) + H 2 O. From this reaction we can see that the product water is produced along with the hydrocarbons, and in some reactors, such as slurry bed reactors, the concentration of water can be very high due to post-mixing.
- the most widely used industrialized Fischer-Tropsch catalyst active species are mainly iron and cobalt.
- the active species of the catalyst is metallic cobalt, which is likely to be oxidized by 50% by weight of the product water, thereby deactivating the catalyst, and the higher the conversion of CO, the more severe the deactivation.
- Bertole et al. J.
- Chinese patent CN101203304A discloses an oxidized support-supported cobalt-based catalyst comprising aluminum and 0.01-20% of lithium, wherein lithium is mainly present in the form of lithium aluminate, and the lithium aluminate-containing carrier is improved. It is water resistant and reduces the formation of cobalt aluminate, which has high activity and high C 5 + selectivity.
- the preparation method of the carrier is severe, and it is required to calcine for a long time at a high temperature of 700 to 1000 °C.
- Chinese patent CN1785515A reports a catalyst for synthesizing middle distillate oil from syngas.
- the catalyst is based on mesoporous zirconia.
- the catalyst has a cobalt content of 5 to 35 wt%, a precious metal content of 0 to 2 wt%, and non-noble metal oxidation. was 0 ⁇ 10wt%, the catalyst has high activity, good stability, selectivity C 11 ⁇ C 20 hydrocarbons is high and good mechanical properties, but preparation of mesoporous zirconium oxide support is complicated and costly.
- the object of the present invention is to overcome the deficiencies of the prior art, and to provide a mesoporous material coated cobalt-based Fischer-Tropsch catalyst with long life, good stability and controllable shell thickness and a preparation method thereof.
- the present invention provides a mesoporous material coated cobalt-based Fischer-Tropsch synthesis catalyst comprising a silica support, which is special in that the surface of the silica support is loaded with active component cobalt and is selected.
- the zirconium auxiliary agent, the active component cobalt and the selective auxiliary zirconium are coated with a mesoporous material shell layer.
- the catalyst of the invention firstly supports the active component on the surface of the silica carrier by impregnation method, and then coats the mesoporous material having the regular pores on the outside of the active component, and the thickness of the shell layer of the mesoporous material can be controlled by changing parameters.
- the thickness of the mesoporous material shell layer is designed to be 1.8 to 13 ⁇ m, and the preferred thickness is 2.0 to 6.0 ⁇ m. In this way, the mesoporous material shell coats the active component inside the pores, avoiding agglomeration and shedding of the active components, and the regular pores of the mesoporous material provide mass transfer channels of CO and H 2 to ensure high reactivity of the catalyst. .
- the active metal Co is prevented from being deactivated by oxidation of water generated during the reaction, and the outer layer of the mesoporous material is covered with A layer of a hydrophobic organic compound.
- the silica carrier is an inorganic silica gel.
- the inorganic silica gel has a specific surface area of 150 to 350 m 2 /g, an average pore diameter of 3 to 50 nm, a pore volume of 0.7 to 1.7 mL/g, and a particle diameter of 20 to 200 ⁇ m.
- the inorganic silica gel has a specific surface area of 200 to 300 m 2 /g, an average pore diameter of 8 to 13 nm, a pore volume of 0.75 to 1.3 mL/g, and a particle diameter of 40 to 150 ⁇ m.
- the active component cobalt is contained in an amount of 10 to 25% by weight based on the total weight of the catalyst, and the selective auxiliary zirconium is contained in an amount of 5 to 10% by weight based on the total weight of the catalyst.
- the active component cobalt is contained in an amount of 15 to 20% by weight based on the total weight of the catalyst, and the selective auxiliary zirconium is contained in an amount of 5 to 8% by weight based on the total weight of the catalyst.
- the active component cobalt is present in an amount of from 20 to 25% by weight based on the total weight of the catalyst, and the optional promoter zirconium is present in an amount of from 8 to 10% by weight based on the total weight of the catalyst.
- the catalyst has a specific surface area of from 150 to 400 m 2 /g, an average pore diameter of from 2 to 40 nm, and a pore volume of from 0.5 to 1.4 mL/g.
- the catalyst has a specific surface area of from 250 to 350 m 2 /g, an average pore diameter of from 3 to 9 nm, and a pore volume of from 0.6 to 1.0 mL/g.
- the preparation method of the above mesoporous material coated cobalt-based Fischer-Tropsch synthesis catalyst comprises the following steps:
- silica carrier is immersed in an aqueous solution of zirconium salt, aged for 12 to 24 hours, dried at 70 to 120 ° C for 8 to 24 hours, and then calcined at 400 to 500 ° C for 3 to 12 hours to obtain a supported zirconium.
- Silica carrier is immersed in an aqueous solution of zirconium salt, aged for 12 to 24 hours, dried at 70 to 120 ° C for 8 to 24 hours, and then calcined at 400 to 500 ° C for 3 to 12 hours to obtain a supported zirconium.
- the obtained zirconium-loaded silica carrier is immersed in an aqueous solution of a cobalt salt, aged for 12 to 24 hours, dried at 70 to 120 ° C for 8 to 24 hours, and then calcined at 400 to 500 ° C for 3 to 12 hours to obtain An initial cobalt-based Fischer-Tropsch synthesis catalyst;
- the obtained initial cobalt-based Fischer-Tropsch synthesis catalyst is immersed in the obtained mesoporous material precursor solution, and then subjected to crystallization, washing, drying and calcination to obtain a mesoporous material coated cobalt-based Fischer-Tropsch synthesis catalyst.
- the zirconium salt is one of zirconium nitrate or zirconyl nitrate, preferably zirconium nitrate.
- the cobalt salt is one of cobalt carbonate or cobalt nitrate, preferably cobalt nitrate.
- the concentration of the nitric acid solution is 1 to 2 mol/L
- the stirring temperature is 25 to 45 ° C
- stirring until the solution becomes clear, and then adding orthosilicate, stirring is continued for 12 to 24 hours
- Mesoporous material precursor solution is 1 to 2 mol/L
- the templating agent P123 is a known triblock copolymer, which is collectively referred to as polyoxyethylene-polyoxypropylene-polyoxyethylene, and has a molecular formula of PEO-PPO-PEO having the formula EO 20 PO 70 EO 20 .
- the crystallization conditions are temperature 80-130 ° C, time 20-100 h, rotation speed 7-20 r / min; washing conditions are deionized water washing to neutral; drying conditions are 80-120 Dry at °C for 10-20 h; calcination conditions are maintained at 400-550 °C for 5-12 h.
- the crystallization conditions are a temperature of 90 to 120 ° C, a time of 30 to 80 h, and a rotation speed of 7 to 15 r/min.
- the hydrophobic organic solution is one of polymethyltriethoxysilane, ⁇ -aminopropyltriethoxysilane or trimethylchlorosilane.
- the organic solvent for washing is one of n-hexane, acetone or ethanol.
- the sealing time of the obtained mesoporous material coated cobalt-based Fischer-Tropsch synthesis catalyst is immersed in the hydrophobic organic solution for 3-8 hours, and then the cleaning is performed with the organic solvent for 2 to 3 times.
- the invention has the beneficial effects that the developed cobalt-based Fischer-Tropsch synthesis catalyst breaks the limitation of the conventional cobalt-based catalyst and eggshell catalyst by first wrapping the mesoporous material shell on the surface of the catalyst, and the thickness of the shell layer. Controlled by process parameters, the pore structure of the mesoporous material provides a channel for diffusion of CO and H 2 while protecting the active component of the catalyst. Further, the introduction of superhydrophobic organic molecules on the mesoporous material shell effectively blocks water molecules from exiting the channels.
- the Co-based catalyst of the invention has the characteristics of long service life, high reaction activity, good stability, high C 5 + selectivity and low methane selectivity, and is particularly suitable for a bubbling slurry bed reactor or a continuous stirred slurry bed reaction. Device.
- Figure 1 is a schematic view showing the process flow of the preparation of the catalyst of the present invention.
- FIG. 2 is a schematic view showing the TEM photomicrostructure of the shell layer thickness of the catalyst B of the present invention.
- Fig. 3 is a schematic view showing the TEM photomicrostructure of the shell layer thickness of the catalyst C of the present invention.
- FIG. 4 is a schematic view showing the TEM photomicrostructure of the shell layer thickness of the catalyst D of the present invention.
- Fig. 5 is a schematic view showing the TEM photomicrostructure of the shell thickness of the catalyst E of the present invention.
- Fig. 6 is a schematic view showing the TEM photomicrostructure of the shell layer thickness of the catalyst F of the present invention.
- Fig. 7 is a schematic view showing the TEM photomicrostructure of the shell thickness of the catalyst G of the present invention.
- the composition of Catalyst B includes an inorganic silica gel support, an active component Co, an auxiliary Zr, and a mesoporous material shell.
- the content of the Zr element was 5% by weight, and the content of the Co element was 20% by weight.
- the preparation method of Catalyst B is as follows:
- the obtained catalyst B had a specific surface area of 291 m 2 /g, a pore volume of 1.16 mL/g, an average pore diameter of 10.6 nm, a thin shell thickness, and a thickness of 1.8 ⁇ m.
- the TEM photograph of the shell thickness of the catalyst B is shown in FIG. 2 . Show.
- the composition of Catalyst C includes an inorganic silica gel support, an active component Co, an auxiliary Zr, and a mesoporous material shell layer as described in Example 1.
- the content of the Zr element was 5% by weight, and the content of the Co element was 20% by weight.
- the preparation method of Catalyst C was substantially the same as that of Example 1, except that the crystallization time was 60 h instead of the crystallization time of Step 3) in Example 1.
- the obtained catalyst C was found to have a specific surface area of 301 m 2 /g, a pore volume of 0.98 mL/g, an average pore diameter of 9.5 nm, a thick shell layer, and a thickness of 5 ⁇ m.
- a TEM photograph of the shell thickness of Catalyst C is shown in FIG.
- the composition of the catalyst D includes an inorganic silica gel support, an active component Co, an auxiliary Zr, and a shell layer of the mesoporous material structure described in Example 1.
- the content of the Zr element was 5% by weight, and the content of the Co element was 20% by weight.
- the catalyst had a specific surface area of 320 m 2 /g, a pore volume of 1.02 mL/g, an average pore diameter of 8.9 nm, and a shell thickness of 13 ⁇ m.
- the preparation method of the catalyst D is basically the same as that of the embodiment 1, except that the crystallization time is 100 hours. Instead of the crystallization time of step 3) in Example 1.
- a TEM photograph of the shell thickness of Catalyst D is shown in FIG.
- the composition of the catalyst E includes an inorganic silica gel carrier, an active component Co, an auxiliary Zr, a mesoporous material shell layer, and a trimethylchlorosilane hydrophobic organic compound layer.
- the content of the Zr element was 5% by weight, and the content of the Co element was 20% by weight.
- the preparation method of the catalyst E is as follows:
- the obtained catalyst E was found to have a specific surface area of 279 m 2 /g, a pore volume of 0.86 mL/g, an average pore diameter of 8.2 nm, a shell thickness of 2.5 ⁇ m, and a TEM photograph of the shell thickness of the catalyst E as shown in FIG. 5 .
- the composition of the catalyst F includes an inorganic silica gel carrier, an active component Co, an auxiliary Zr, a mesoporous material shell layer, and a polymethyltriethoxysilane hydrophobic organic compound layer.
- the content of the Zr element was 5% by weight, and the content of the Co element was 20% by weight.
- Catalyst F was prepared in substantially the same manner as in Example 4, except that polymethyltriethoxysilane was used in place of trimethylchlorosilane in Example 4.
- the specific surface area of the catalyst F was 282 m 2 /g, the pore volume was 0.91 mL/g, the average pore diameter was 7.9 nm, and the thickness of the shell layer was 2.1 ⁇ m.
- the TEM photograph of the shell thickness of the catalyst F is shown in Fig. 6.
- the composition of the catalyst G includes an inorganic silica gel support, an active component Co, an auxiliary Zr, a mesoporous material shell layer, and a ⁇ -aminopropyltriethoxysilane hydrophobic organic compound layer.
- the content of the Zr element was 5% by weight, and the content of the Co element was 20% by weight.
- Catalyst G was prepared in substantially the same manner as in Example 4, except that ⁇ -aminopropyltriethoxysilane was used in place of trimethylchlorosilane in Example 4.
- the specific surface area of the catalyst G was 280 m 2 /g, the pore volume was 0.83 mL/g, the average pore diameter was 8.5 nm, and the thickness of the shell layer was 2.3 ⁇ m.
- the TEM photograph of the shell thickness of the catalyst G is shown in Fig. 7.
- the composition of the catalyst H includes an inorganic silica gel support, an active component Co, an auxiliary Zr, a mesoporous material shell layer, and a ⁇ -aminopropyltriethoxysilane hydrophobic organic compound layer.
- the content of the Zr element was 8 wt%, and the content of the Co element was 25 wt%.
- the preparation method of the catalyst H is as follows:
- an inorganic silica gel carrier having a specific surface area of 150 m 2 /g, a pore volume of 1.3 mL/g, an average pore diameter of 8 nm, and an average particle diameter of 90 ⁇ m was immersed in 45 mL of an aqueous solution containing 16.74 g of Zr(NO 3 ) 4 ⁇ 5H 2 O. After aging for 24 hours in the air, it was dried at 120 ° C for 10 h, and then calcined at 500 ° C for 3 h in a muffle furnace to obtain a zirconium-loaded inorganic silica gel carrier;
- the catalyst H was found to have a specific surface area of 200 m 2 /g, a pore volume of 1.0 mL/g, an average pore diameter of 4.0 nm, and a shell thickness of 2.0 ⁇ m.
- the composition of the catalyst I includes an inorganic silica gel support, an active component Co, an auxiliary Zr, a mesoporous material shell layer, and a ⁇ -aminopropyltriethoxysilane hydrophobic organic compound layer.
- the content of the Zr element was 10% by weight, and the content of the Co element was 10% by weight.
- the preparation method of the catalyst I is as follows:
- the specific surface area of the catalyst I was determined to be 350 m 2 /g, the pore volume was 0.6 mL/g, the average pore diameter was 9 nm, and the shell layer thickness was 6 ⁇ m.
- the composition of the conventional catalyst A includes an inorganic silica gel carrier, an active component Co, and an auxiliary agent Zr.
- the content of the Zr element was 5% by weight, and the content of the Co element was 20% by weight.
- the preparation method of Catalyst A is as follows:
- the zirconium-loaded inorganic silica gel carrier was immersed in 63 mL of an aqueous solution containing 39.43 g of Co(NO 3 ) 3 ⁇ 6H 2 O, aged in air for 16 h, placed at 110 ° C for 8 h, and then in the muffle. The furnace was calcined at 450 ° C for 10 h to obtain a cobalt-based Fischer-Tropsch synthesis catalyst A.
- the conversion rate of CO does not change much, ranging from 55 to 65%, mainly because the shell layer of the mesoporous material has a certain The thickness, but the particle size of the catalyst is small, the mass transfer resistance is also relatively small, and the mesoporous material shell provides a mass transfer channel for H 2 and CO.
- the selectivity of liquid hydrocarbons is slightly increased, and the selectivity of methane is slightly reduced, probably because the shell of the mesoporous material can prevent the active components from falling off due to friction during activation and transfer.
- the mesoporous material shell layer can block the moisture of the bulk phase from directly contacting the active center.
- the selectivity of liquid hydrocarbons increases, and the selectivity of methane also decreases significantly. This indicates that the catalyst can be effectively prevented from being water after introducing a hydrophobic substance into the shell layer of the mesoporous material. Oxidized and deactivated, when the moisture of the small molecule is generated, it is blown by the syngas along the layer of the hydrophobic organic compound to the outside of the shell. It can be seen that the Co-based catalyst prepared by the invention has high reactivity, high C 5 + selectivity and low methane selectivity.
- the selectivity of the liquid hydrocarbon is increased more. Since the molecular structure of the organic substance of the modified catalyst F is relatively small, the hydrophobicity is slightly worse than that of the catalysts E and G. The organic matter of the modified catalyst E is more expensive than the modified catalyst G, and is volatile and highly corrosive. Catalyst H has a small specific surface area and pore size, and its activity and selectivity of liquid hydrocarbons are slightly reduced. The particle size of catalyst I is larger, the shell layer is thicker, there is a certain mass transfer resistance, and the conversion rate of CO is decreased. Catalyst G has a longer crystallization time, so catalyst G is superior to catalysts E, F, H, and I.
- the activity of the conventional catalyst A without any modification reaches 800 h, and the activity begins to decrease. This may be due to the fact that the metal Co on the surface of the catalyst is detached from the surface of the catalyst due to friction under a long stirring state. Moreover, the water formed by the reaction causes the catalyst to be oxidized and deactivated. When the shell of the mesoporous material is coated to form catalysts B and G, the reaction time is extended to 1500 h, and the conversion of CO is still above 55%. It may be that the shell layer of the catalyst can protect the active center of the catalyst and prevent the metal part of the catalyst. Falling off due to friction.
- the catalyst G modified by hydrophobic organic compounds has a high catalytic activity when the reaction is carried out for 2500 h, the conversion of CO is still about 60%, and the selectivity of liquid hydrocarbons is about 85%, indicating that the life of the catalyst is significantly prolonged.
- the introduction of the hydrophobic group on the mesoporous material shell can effectively prevent the metal portion of the catalyst from falling off, and can effectively prevent the moisture from contacting the active center to deactivate the catalyst.
- the Co-based catalyst prepared by the present invention has excellent stability and effectively improves the service life.
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Abstract
Description
催化剂 | XCO/% | S(CH4)/% | S(C2-C4)% | S(C5 +)/% | S(CO2)/% |
A | 60.3 | 14.5 | 7.1 | 76.9 | 1.5 |
B | 61.0 | 10.6 | 7.1 | 81.1 | 1.2 |
C | 60.5 | 10.2 | 7.5 | 81.0 | 1.3 |
D | 60.0 | 10.7 | 7.0 | 80.9 | 1.4 |
E | 62.4 | 5.5 | 6.3 | 87.2 | 1.0 |
F | 63.1 | 9.2 | 6.9 | 82.9 | 1.0 |
G | 64.5 | 5.2 | 6.3 | 87.5 | 0.9 |
H | 60.0 | 7.6 | 7.1 | 84.3 | 1.0 |
I | 55.3 | 7.8 | 7.5 | 83.8 | 0.9 |
催化剂 | t=500h | t=800h | t=1000h | t=1500h | t=2000h | t=2500h |
A | 60.3% | 58.6% | 50.4% | 40.3% | 31.8% | 25.8% |
B | 61.0% | 60.9% | 59.9% | 56.9% | 50.2% | 40.1% |
G | 64.5% | 64.4% | 64.3% | 63.9% | 62.2% | 60.1% |
催化剂 | t=500h | t=800h | t=1000h | t=1500h | t=2000h | t=2500h |
A | 76.9% | 76.8% | 71.3% | 63.5% | 58.1% | 53.5% |
B | 81.0% | 81.1% | 79.5% | 76.4% | 70.6% | 67.8% |
G | 87.4% | 87.5% | 87.5% | 86.5% | 85.9% | 84.9% |
Claims (22)
- 一种介孔材料包覆式钴基费托合成催化剂,包括二氧化硅载体,其特征在于:所述二氧化硅载体表面负载有活性组分钴和选择性助剂锆,所述活性组分钴和选择性助剂锆外面包覆有介孔材料壳层。
- 根据权利要求1所述的介孔材料包覆式钴基费托合成催化剂,其特征在于:所述介孔材料壳层外面还覆盖有疏水性有机化合物层。
- 根据权利要求1或2所述的介孔材料包覆式钴基费托合成催化剂,其特征在于:所述二氧化硅载体为无机硅胶。
- 根据权利要求3所述的介孔材料包覆式钴基费托合成催化剂,其特征在于:所述无机硅胶的比表面积为150~350m2/g、平均孔径为3~50nm、孔容为0.7~1.7mL/g、粒径为20~200μm。
- 根据权利要求4所述的介孔材料包覆式钴基费托合成催化剂,其特征在于:所述无机硅胶的比表面积为200~300m2/g、平均孔径为8~13nm、孔容为0.75~1.3mL/g、粒径40~150μm。
- 根据权利要求1或2所述的介孔材料包覆式钴基费托合成催化剂,其特征在于:所述活性组分钴的含量占催化剂总重量的10~25%,所述选择性助剂锆的含量占催化剂总重量的5~10%。
- 根据权利要求6所述的介孔材料包覆式钴基费托合成催化剂,其特征在于:所述活性组分钴的含量占催化剂总重量的15~20%,所述选择性助剂锆的含量占催化剂总重量的5~8%。
- 根据权利要求6所述的介孔材料包覆式钴基费托合成催化剂,其特征在于:所述活性组分钴的含量占催化剂总重量的20~25%,所述选择性助剂锆的含量占催化剂总重量的8~10%。
- 根据权利要求1或2所述的介孔材料包覆式钴基费托合成催化剂,其特征在于:所述介孔材料壳层的厚度为1.8~13μm。
- 根据权利要求9所述的介孔材料包覆式钴基费托合成催化剂,其特征在于:所述介孔材料壳层的厚度为2.0~6.0μm。
- 根据权利要求1或2所述的介孔材料包覆式钴基费托合成催化剂,其特征在于:所述催化剂的比表面积为150~400m2/g,平均孔径为2~40nm,孔容为0.5~1.4mL/g。
- 根据权利要求11所述的介孔材料包覆式钴基费托合成催化剂,其特征在于:所述催化剂的比表面积为250~350m2/g,平均孔径为3~9nm、孔容为0.6~1.0mL/g。
- 一种根据权利要求1所述的介孔材料包覆式钴基费托合成催化剂的制备方法,其特征在于,它包括以下步骤:1)将二氧化硅载体浸渍在锆盐的水溶液中,陈化12~24h后,在70~120℃下干燥8~24h,再在400~500℃下焙烧3~12h,获得负载锆的二氧化硅载体;2)将所得负载锆的二氧化硅载体浸渍在钴盐的水溶液中,陈化12~24h后,在70~120℃下干燥8~24h,再在400~500℃下焙烧3~12h,获得初始钴基费托合成催化剂;3)将模板剂P123溶解到硝酸溶液中,搅拌使其混合均匀,再加入正硅酸乙酯,继续搅拌12~30h,获得介孔材料前驱溶液;4)将所得初始钴基费托合成催化剂浸渍在所得介孔材料前驱溶液中, 然后进行晶化、洗涤、干燥和焙烧,即可获得介孔材料包覆式钴基费托合成催化剂。
- 根据权利要求13所述介孔材料包覆式钴基费托合成催化剂的制备方法,其特征在于:它还包括如下步骤:5)将所得介孔材料包覆式钴基费托合成催化剂浸渍在疏水性有机溶液中,密封3~12h后取出,再选择清洗用有机溶剂漂洗干净,最后在60~90℃条件下干燥3~8h,即可获得疏水性介孔材料包覆式钴基费托合成催化剂。
- 根据权利要求13或14所述介孔材料包覆式钴基费托合成催化剂的制备方法,其特征在于:所述步骤1)中,锆盐为硝酸锆或硝酸氧锆中的一种。
- 根据权利要求13或14所述介孔材料包覆式钴基费托合成催化剂的制备方法,其特征在于:所述步骤2)中,所述钴盐为碳酸钴或硝酸钴中的一种。
- 根据权利要求13或14所述介孔材料包覆式钴基费托合成催化剂的制备方法,其特征在于:所述步骤3)中,硝酸溶液的浓度为1~2mol/L,搅拌温度为25~45℃,搅拌至溶液变澄清,再加入正硅酸乙酯,继续搅拌12~24h,获得介孔材料前驱溶液。
- 根据权利要求13或14所述介孔材料包覆式钴基费托合成催化剂的制备方法,其特征在于:所述步骤4)中,晶化条件为温度80~130℃、时间20~100h、转速7~20r/min;洗涤条件为去离子水洗涤至中性;干燥条件为80~120℃干燥10~20h;焙烧条件为400~550℃保持5~12h。
- 根据权利要求18所述介孔材料包覆式钴基费托合成催化剂的制备 方法,其特征在于:所述步骤4)中,晶化条件为温度90~120℃、时间30~80h、转速7~15r/min。
- 根据权利要求14所述介孔材料包覆式钴基费托合成催化剂的制备方法,其特征在于:所述步骤5)中,疏水性有机溶液为聚甲基三乙氧基硅烷、γ-氨丙基三乙氧基硅烷或三甲基氯硅烷中的一种。
- 根据权利要求14所述介孔材料包覆式钴基费托合成催化剂的制备方法,其特征在于:所述步骤5)中,清洗用有机溶剂为正己烷、丙酮或乙醇中的一种。
- 根据权利要求20所述介孔材料包覆式钴基费托合成催化剂的制备方法,其特征在于:所述步骤5)中,所得介孔材料包覆式钴基费托合成催化剂浸渍在疏水性有机溶液中的密封时间为3~8h,再选择清洗用有机溶剂漂洗2~3次。
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JP2016563174A JP6337144B2 (ja) | 2014-04-22 | 2015-02-06 | メソ多孔性材料被覆型コバルト系フィッシャートロプシュ合成触媒及びその調製方法 |
KR1020167032475A KR101906027B1 (ko) | 2014-04-22 | 2015-02-06 | 메조포러스 물질로 코팅된 코발트계 피셔-트롭시 합성 촉매제 및 그 제조 방법 |
RU2016145414A RU2642451C1 (ru) | 2014-04-22 | 2015-02-06 | Катализатор синтеза фишера-тропша на основе кобальта, покрытый мезопористыми материалами, и способ его получения |
EP15783307.0A EP3135372A4 (en) | 2014-04-22 | 2015-02-06 | Cobalt-based fischer-tropsch synthesis catalyst coated with mesoporous materials and preparation method therefor |
US15/331,925 US10363550B2 (en) | 2014-04-22 | 2016-10-24 | Mesoporous material-coated cobalt-based catalyst for fischer-tropsch synthesis and method for preparing the same |
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US20170036198A1 (en) | 2017-02-09 |
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