CN115532266B - Ni-Cu/AC catalyst for preparing gas fuel by hydrothermally converting indole and derivative thereof and preparation method thereof - Google Patents
Ni-Cu/AC catalyst for preparing gas fuel by hydrothermally converting indole and derivative thereof and preparation method thereof Download PDFInfo
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- CN115532266B CN115532266B CN202211182178.3A CN202211182178A CN115532266B CN 115532266 B CN115532266 B CN 115532266B CN 202211182178 A CN202211182178 A CN 202211182178A CN 115532266 B CN115532266 B CN 115532266B
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- SIKJAQJRHWYJAI-UHFFFAOYSA-N Indole Chemical compound C1=CC=C2NC=CC2=C1 SIKJAQJRHWYJAI-UHFFFAOYSA-N 0.000 title claims abstract description 56
- 239000003054 catalyst Substances 0.000 title claims abstract description 39
- 229910018054 Ni-Cu Inorganic materials 0.000 title claims abstract description 30
- 229910018481 Ni—Cu Inorganic materials 0.000 title claims abstract description 30
- PZOUSPYUWWUPPK-UHFFFAOYSA-N indole Natural products CC1=CC=CC2=C1C=CN2 PZOUSPYUWWUPPK-UHFFFAOYSA-N 0.000 title claims abstract description 28
- RKJUIXBNRJVNHR-UHFFFAOYSA-N indolenine Natural products C1=CC=C2CC=NC2=C1 RKJUIXBNRJVNHR-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 239000000446 fuel Substances 0.000 title claims abstract description 18
- 238000002360 preparation method Methods 0.000 title claims abstract description 7
- 238000006243 chemical reaction Methods 0.000 claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 238000002309 gasification Methods 0.000 claims abstract description 17
- 239000000843 powder Substances 0.000 claims abstract description 16
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 10
- 238000001035 drying Methods 0.000 claims abstract description 7
- 238000001816 cooling Methods 0.000 claims abstract description 5
- 238000001354 calcination Methods 0.000 claims abstract description 4
- SXTLQDJHRPXDSB-UHFFFAOYSA-N copper;dinitrate;trihydrate Chemical compound O.O.O.[Cu+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O SXTLQDJHRPXDSB-UHFFFAOYSA-N 0.000 claims abstract description 4
- 238000000227 grinding Methods 0.000 claims abstract description 4
- AOPCKOPZYFFEDA-UHFFFAOYSA-N nickel(2+);dinitrate;hexahydrate Chemical compound O.O.O.O.O.O.[Ni+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O AOPCKOPZYFFEDA-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910002651 NO3 Inorganic materials 0.000 claims abstract description 3
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims abstract description 3
- 238000002156 mixing Methods 0.000 claims abstract description 3
- 238000003756 stirring Methods 0.000 claims abstract description 3
- 229910052739 hydrogen Inorganic materials 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 7
- 239000011148 porous material Substances 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 238000011068 loading method Methods 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 17
- 239000002028 Biomass Substances 0.000 description 9
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 9
- 239000001257 hydrogen Substances 0.000 description 9
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000037361 pathway Effects 0.000 description 4
- 150000002475 indoles Chemical class 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000001228 spectrum Methods 0.000 description 3
- 230000003197 catalytic effect Effects 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 239000013067 intermediate product Substances 0.000 description 2
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 2
- 229910000510 noble metal Inorganic materials 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000000197 pyrolysis Methods 0.000 description 2
- 230000035484 reaction time Effects 0.000 description 2
- 238000000629 steam reforming Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 229940054051 antipsychotic indole derivative Drugs 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012075 bio-oil Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010335 hydrothermal treatment Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000029553 photosynthesis Effects 0.000 description 1
- 238000010672 photosynthesis Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000008247 solid mixture Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- 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
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
- B01J23/74—Iron group metals
- B01J23/755—Nickel
-
- 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
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/20—Catalysts, in general, characterised by their form or physical properties characterised by their non-solid state
- B01J35/23—Catalysts, in general, characterised by their form or physical properties characterised by their non-solid state in a colloidal state
-
- 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
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/30—Catalysts, in general, characterised by their form or physical properties characterised by their physical properties
- B01J35/396—Distribution of the active metal ingredient
- B01J35/399—Distribution of the active metal ingredient homogeneously throughout the support particle
-
- 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
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/60—Catalysts, in general, characterised by their form or physical properties characterised by their surface properties or porosity
- B01J35/61—Surface area
- B01J35/617—500-1000 m2/g
-
- 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
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/60—Catalysts, in general, characterised by their form or physical properties characterised by their surface properties or porosity
- B01J35/63—Pore volume
- B01J35/633—Pore volume less than 0.5 ml/g
-
- 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
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/60—Catalysts, in general, characterised by their form or physical properties characterised by their surface properties or porosity
- B01J35/63—Pore volume
- B01J35/635—0.5-1.0 ml/g
-
- 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
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/60—Catalysts, in general, characterised by their form or physical properties characterised by their surface properties or porosity
- B01J35/64—Pore diameter
- B01J35/647—2-50 nm
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
- Y02P20/54—Improvements relating to the production of bulk chemicals using solvents, e.g. supercritical solvents or ionic liquids
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- Oil, Petroleum & Natural Gas (AREA)
- General Chemical & Material Sciences (AREA)
- Catalysts (AREA)
Abstract
The invention discloses a Ni-Cu/AC catalyst for preparing gas fuel by using indole and derivatives thereof through hydrothermal conversion and a preparation method thereof, comprising the following steps: dissolving nickel nitrate hexahydrate and copper nitrate trihydrate in water to prepare a solution A; adding active carbon into the solution A, fully stirring and mixing, then drying to ensure that moisture is fully volatilized, and grinding to obtain powder B; calcining the powder B to decompose nitrate into oxide, and naturally cooling to room temperature to obtain powder C; by H 2 And (3) carrying out reduction treatment on the powder C to obtain the Ni-Cu/AC catalyst for preparing the gas fuel by carrying out hydrothermal conversion on indole and derivatives thereof. The invention can realize high-efficiency conversion of indole and derivatives thereof at a lower temperature, realize high combustible gas yield and greatly reduce the cost of supercritical water gasification of indole and derivatives thereof.
Description
Technical Field
The invention belongs to the technical field of supercritical water gasification reaction, and particularly relates to a Ni-Cu/AC catalyst for preparing gas fuel by carrying out hydrothermal conversion on indole and derivatives thereof and a preparation method thereof.
Background
Biomass, such as waste materials of agriculture and forestry, industrial and municipal waste, etc., is one of the best choices of renewable energy sources that can be used in a range of energy conversion technologies, and is considered to be a carbon-neutral energy source due to its photosynthesis. However, a significant portion of the biomass remains unutilized, and the moisture content of these unutilized biomass can range from 50% to 80%. By utilizing the supercritical hydrothermal treatment technology, natural biomass with high water content can be converted into combustible gas with hydrogen as a main product. The hydrogen energy is one of renewable energy sources, is a clean fuel with zero carbon emission, and the hydrogen economy using the hydrogen as the fuel has great potential in the aspect of renewable biomass energy resource development. Generally, biomass can produce hydrogen in two ways, respectively: direct production pathways and storable intermediate conversion pathways. The first pathway includes thermochemical gasification, pyrolysis, and anaerobic digestion. The second approach involves steam reforming of bio-oils, which are produced by biomass pyrolysis. In the hydrogen production pathway, the conventional biomass gasification technology requires drying raw materials and a great deal of additional energy consumption must be paid to evaporate water, so hydrogen production by supercritical water gasification technology has attracted great interest and attention in recent years.
Indole and its derivatives are typical nitrogenous substances of biomass, they have recalcitrance, and are difficult to be converted and gasified into small molecular gas molecules in the supercritical water gasification process, which greatly hinders the application of SCWG. The addition of the catalyst into the supercritical water gasification reaction system of the nitrogen-containing organic substances is a very effective method for strengthening supercritical water gasification of refractory intermediate products, and improves the yield of combustible gas. However, existing research generally requires the use of higher gasification temperatures and noble metal catalysts, which is detrimental to the popularization and application of supercritical water gasification technology.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a Ni-Cu/AC catalyst for preparing gas fuel by the hydrothermal conversion of indole and derivatives thereof and a preparation method thereof, so as to realize the aim of efficiently converting indole and derivatives thereof into combustible gas fuel mainly comprising hydrogen.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
the invention discloses a preparation method of a Ni-Cu/AC catalyst for preparing gas fuel by using indole and derivatives thereof through hydrothermal conversion, which comprises the following steps:
1) The mass ratio is 3:1 nickel nitrate hexahydrate and copper nitrate trihydrate are dissolved in water to prepare solution A;
2) Adding active carbon accounting for 70% of the mass of the Ni-Cu/AC catalyst into the solution A, fully stirring and mixing for at least 12 hours, then drying for 4 hours at 110 ℃ and drying to ensure that moisture is fully volatilized, and grinding to obtain powder B;
3) Calcining the powder B at N 2 In the atmosphere, from room temperature, heating to 550 ℃ at a heating rate of 3 ℃/min (if the temperature is too high, particles become large, and the later reduction difficulty is increased), treating for 4 hours to decompose nitrate into oxide, and naturally cooling to room temperature to obtain powder C;
4) By H 2 Reducing powder C with Ar as protecting gas and H 2 Reduction treatment of powder C, ar and H 2 The flow ratio of (2) is 1:1, the temperature is raised to 400 ℃ from the room temperature at a heating rate of 3 ℃/min (the temperature is obtained through TPR analysis and test and is a proper reduction temperature), and the treatment is carried out for 4 hours, so that the Ni-Cu/AC catalyst for preparing the gas fuel by the indole and the derivative thereof through the hydrothermal conversion is ensured.
The invention also discloses a Ni-Cu/AC catalyst for preparing gas fuel by the indole and the derivative thereof through hydrothermal conversion,the specific surface area of the Ni-Cu/AC catalyst is about 684.70m 2 Per g, porosity of about 0.45cm 3 And/g, average pore size of about 26.4nm.
The invention also discloses the application of the Ni-Cu/AC catalyst for preparing the gas fuel by the indole and the indole derivative through the hydrothermal conversion in the supercritical water gasification reaction, wherein the reaction temperature is 550-600 ℃, the reaction time is 30-40 min, and the catalyst loading amount is 10% of the mass of the indole or the indole derivative.
Compared with the prior art, the invention has the following beneficial effects:
1. the Ni-Cu/AC catalyst prepared by the invention adopts non-noble metal nickel and copper as raw materials, and has low manufacturing cost.
2. The Ni-Cu/AC catalyst can efficiently catalyze steam reforming reaction, degradation reaction and water vapor conversion reaction of indole, indole derivatives and intermediate products thereof, accelerate degradation of indole and derivatives thereof, and obtain more gas products, thereby improving the conversion rate and the combustible gas yield of indole and derivatives thereof.
3. The Ni-Cu/AC catalyst can realize high-efficiency conversion of indole and derivatives thereof at a lower temperature, realize high combustible gas yield, greatly reduce the cost of supercritical water gasification of the indole and derivatives thereof, and improve the implementation safety of the technology.
Drawings
FIG. 1 is an SEM spectrum of a Ni-Cu/AC catalyst before and after the reaction. Wherein, (a) is an SEM spectrogram before the catalyst is reacted; (b) is an SEM spectrum after the catalyst reaction.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention is described in further detail below with reference to the attached drawing figures:
examples
0.7821g of copper nitrate trihydrate and 2.3782g of nickel nitrate hexahydrate were formulated into a solution, after which 1.6g of activated carbon was added thereto, and the mixture was sufficiently stirred at room temperature for at least 12 hours to obtain a viscous solution. And placing the stirred solution into a baking oven at 110 ℃ for drying for 4 hours to fully volatilize the water. Grinding the dried solid mixture to obtain a powder. Placing solid powder into N 2 Calcining at 550 ℃ from room temperature at a heating rate of 3 ℃/min under the atmosphere, and naturally cooling until the room temperature is reached after 4 hours. The restore procedure is then started, at H 2 And Ar at a heating rate of 3 ℃/min to 400 ℃ and maintaining for 4 hours, and cooling to room temperature. The Ni-Cu/AC catalyst for preparing the gas fuel by the hydrothermal conversion of indole and derivatives thereof is prepared, and the specific surface area of the Ni-Cu/AC catalyst is 684.70m 2 Per g, porosity 0.45cm 3 And/g, average pore diameter 26.4nm.
The SEM spectrogram is shown in (a) of fig. 1, and from the graph, the surface morphology of the Ni-Cu/AC catalyst with active carbon as a carrier and the active carbon carrier can be seen, and the surface has rich off-white small particles, which indicates that the nano metal ions of the metal active component are well and uniformly attached on the surface of the active carbon carrier. The surface of the Ni-Cu/AC catalyst has smaller nickel particles, and the surface exposes more nickel active sites, so that the Ni-Cu/AC catalyst has high catalytic activity.
0.0016g of Ni-Cu/AC catalyst and 300 mu L of 0.25mol/L indole solution were charged into a reactor, and a supercritical water gasification experiment was performed at a temperature of 575℃for a reaction time of 30 minutes. The reaction results are shown in Table 1:
TABLE 1 results of gas fuel production by indole hydrothermal conversion with or without Ni-Cu/AC catalyst (575 ℃ C., 30 min)
It can be seen that indole hydrogen gasification efficiency, carbon gasification efficiency, H 2 Yield and CH 4 The yield is significantly improved after the catalyst is added.
The SEM spectrum of the catalyst after the reaction is shown in fig. 1 (b), and it can be seen from the graph that the Ni-Cu/AC catalyst still maintains a partial porous structure after the reaction, which indicates that Cu has a certain alleviation effect on sintering of the Ni-based catalyst and still has good catalytic activity.
Claims (3)
1. The application of the Ni-Cu/AC catalyst in preparing indole and derivatives thereof from gas fuel by hydrothermal conversion is characterized in that the preparation method of the Ni-Cu/AC catalyst comprises the following steps:
1) The mass ratio is 3:1 nickel nitrate hexahydrate and copper nitrate trihydrate are dissolved in water to prepare solution A;
2) Adding active carbon accounting for 70% of the mass of the Ni-Cu/AC catalyst into the solution A, fully stirring and mixing at least 12h, then drying at 110 ℃ for 4h, drying to ensure that moisture is fully volatilized, and grinding to obtain powder B;
3) Calcining the powder B at N 2 Under the atmosphere, the temperature is raised to 550 ℃ at a heating rate of 3 ℃/min from room temperature, and 4h is treated to makeDecomposing nitrate into oxide, and naturally cooling to room temperature to obtain powder C;
4) By H 2 Reducing powder C with Ar as protecting gas and H 2 Reduction treatment of powder C, ar and H 2 The flow ratio of (2) is 1:1, the temperature is raised to 400 ℃ from the room temperature at the heating rate of 3 ℃/min, and the treatment is carried out for 4h, so that the Ni-Cu/AC catalyst for preparing the gas fuel by the indole and the derivative thereof through the hydrothermal conversion is ensured to be prepared;
the application is that indole or derivatives thereof are used as raw materials to carry out supercritical water gasification reaction to prepare the gas fuel.
2. The use according to claim 1, wherein the Ni-Cu/AC catalyst has a specific surface area of 685, 685 m 2 Per g, porosity of 0.5 cm 3 /g, average pore size 26 nm.
3. The use according to claim 2, wherein the Ni-Cu/AC catalyst is used in supercritical water gasification at 550-600 ℃ for 30-40 min with a catalyst loading of 10% of the mass of indole or its derivatives.
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