A process for refining feces into biofuel

Abstract

The present invention relates to a process for refining feces into biofuel, and belongs to the technical field of biomass liquid fuel production. The present invention discloses a process for refining feces into biofuel, and the specific steps are as follows: (1) the raw materials are pressed into material blocks, and sent to an oxygen-free heating furnace for baking to obtain pre-treated material blocks; (2) the pre-treated material blocks are put into a pure oxygen continuous gasification furnace, and a composite catalyst is added at the same time, and then cooled to obtain gas a and tar; (3) the tar is taken and a cracking catalyst is added, and then heated to obtain gas b; (4) gas a and gas b are passed into a Fischer-Tropsch synthesis tower to synthesize biofuel gas, and biofuel is obtained after condensation. The present invention uses feces, straw and PET as raw materials, and the three together improve the gasification efficiency. At the same time, the addition of the composite catalyst and the catalytic cracking step of the tar further improve the gasification efficiency. Therefore, the process for refining feces into biofuel has a higher production efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of biomass liquid fuel production and relates to a process for refining feces into biofuel. Background Art

[0002] Biomass raw materials mainly include the following categories: trees and logging residues, straw and agricultural residues, urban garbage, human and animal feces and organic wastewater. Among them, feces contain rich organic matter and inorganic elements, and are a biomass resource with great potential for recycling.

[0003] At present, the technologies for resource utilization of feces mainly include incineration heat generation, gasification, hydrothermal liquefaction, hydrothermal carbonization, anaerobic digestion, aerobic composting, vermicomposting, etc. Among them, hydrothermal liquefaction can directly use wet feces to convert into biofuel, which has the advantages of low energy consumption and environmental friendliness. However, the current data on feces hydrothermal liquefaction almost all come from experiments in small batches of small high-pressure sterilization reactors, lacking large-scale experimental research that is closer to practical application, and the continuous mode is still lacking in research.

[0004] Gasification is a process that uses oxygen or oxygen-containing substances in the air as a gasifying agent to cause chain cracking of organic high molecular hydrocarbons under high temperature conditions, and to undergo thermochemical reactions with the gasifying agent to generate combustible synthesis gas. Synthesis gas has high calorific value and energy density, and can replace fossil fuels after quality improvement and purification, and can also be further processed into bio-liquid fuels through the Fischer-Tropsch process. Although gasification has many advantages, it still has obvious disadvantages. Tar containing heavy aromatic hydrocarbons is a by-product of the gasification process, mainly produced when the gasification temperature is low. It can be further thermally cracked, catalytically cracked or reformed, thereby increasing the yield of synthesis gas, but it will increase the cost of gasification. The gasification efficiency of biomass directly affects the yield of bio-liquid fuel. Therefore, the process for refining feces into biofuel provided by the present invention can effectively solve the above problems. Summary of the invention

[0005] The present invention relates to a process for refining feces into biofuel, and belongs to the technical field of biomass liquid fuel production. The present invention discloses a process for refining feces into biofuel, and the specific steps are as follows: (1) the raw materials are pressed into material blocks, and sent to an oxygen-free heating furnace for baking to obtain pre-treated material blocks; (2) the pre-treated material blocks are put into a pure oxygen continuous gasification furnace, and a composite catalyst is added at the same time, and then cooled to obtain gas a and tar; (3) the tar is taken and a cracking catalyst is added, and then heated to obtain gas b; (4) gas a and gas b are passed into a Fischer-Tropsch synthesis tower to synthesize biofuel gas, and biofuel is obtained after condensation. The present invention uses feces, straw and PET as raw materials, and the three together improve the gasification efficiency. At the same time, the addition of the composite catalyst and the catalytic cracking step of the tar further improve the gasification efficiency. Therefore, the process for refining feces into biofuel has a higher production efficiency.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A process for refining feces into biofuel, the process comprising the following steps:

[0008] (1) Pressing the raw materials into material blocks, and sending them into an oxygen-free heating furnace to bake them until the water content is 20-30%, thereby obtaining pretreated material blocks;

[0009] (2) The pretreated material block is put into a pure oxygen continuous gasification furnace, a composite catalyst is added, and then cooled to obtain gas a and tar;

[0010] (3) taking tar and adding a cracking catalyst, and then heating to obtain gas b;

[0011] (4) Gas a and gas b are introduced into a Fischer-Tropsch synthesis tower to synthesize biofuel gas, and biofuel is obtained after condensation.

[0012] Furthermore, the raw materials in step (1) are composed of feces, straw and PET in a mass ratio of 7-9.2:1-1.5:0.5-1, wherein the feces are feces of humans, livestock, and poultry, and the straw is at least one of wheat straw, rice straw, corn straw, and cotton straw.

[0013] Furthermore, in the step (1), the specifications of the material block are 2cm×5cm×2cm or 3cm×10cm×3cm, and the temperature of the heating furnace is 150-200°C.

[0014] Furthermore, in step (2), the mass ratio of the pretreated material block to the composite catalyst is 100:0.5-1.2, wherein the composite catalyst is composed of manganese ore powder and metal oxide in a mass ratio of 1:1, and the metal oxide is iron oxide or copper oxide.

[0015] Furthermore, in the step (2), the temperature inside the pure oxygen continuous gasification furnace decreases from bottom to top, that is, the temperature of the bottom layer is 600°C, the temperature of the top layer is 200°C, and the cooling temperature is 80-100°C.

[0016] Furthermore, in the step (3), the mass of the cracking catalyst accounts for 5-15% of the mass of the tar, wherein the cracking catalyst is Ni-Al2O3, and the heating temperature is 700-850°C.

[0017] Furthermore, the preparation method of Ni-Al2O3 is: put nickel nitrate hexahydrate, aluminum nitrate nonahydrate and ammonium carbonate in a ball mill, take them out after ball milling for 1-2 hours, then heat them to 120°C and dry them for 10-12 hours, then transfer them to a muffle furnace and calcine them at 800°C for 3 hours to obtain Ni-Al2O3, wherein the mass ratio of nickel nitrate hexahydrate, aluminum nitrate nonahydrate and ammonium carbonate is 1:2:1.

[0018] Furthermore, in step (4), the temperature and pressure of the Fischer-Tropsch synthesis tower are 150-300°C and 1-3Mpa respectively, and the composition of the biofuel gas is: C2-C8 hydrocarbons 4-8vol%, C9 and above hydrocarbons greater than 90vol%.

[0019] Beneficial effects of the present invention:

[0020] 1. The present invention uses feces, straw and PET as raw materials, which are put into a gasifier for gasification. The synergistic effect between the raw materials improves the gasification efficiency and reduces the generation of tar;

[0021] 2. The pre-treated materials can be obtained quickly by baking, and their moisture content can be controlled to obtain better gasification effect. At the same time, the volatile content in the raw materials can be effectively reduced to reduce soot and carbon deposition, thereby reducing the blockage of the equipment;

[0022] 3. Manganese ore powder and metal oxides are used as composite catalysts. Both improve the gasification efficiency of raw materials. Metal oxides combine with sulfides and nitrides to remove sulfur elements in the gas and protect the activity and life of the composite catalyst. In addition, the composite catalyst reduces the required gasification temperature, thereby reducing the loss of equipment;

[0023] 4. The tar is separated and gasified with a cracking catalyst, which increases the yield of biofuel. The separation process reduces energy consumption and equipment loss, is not affected by sulfur, and can effectively maintain the activity of the cracking catalyst and increase its service life. DETAILED DESCRIPTION

[0024] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are described in detail below in combination with embodiments.

[0025] Example 1

[0026] A process for refining feces into biofuel, the process comprising the following steps:

[0027] (1) Pressing the raw materials into material blocks, and sending them into an oxygen-free heating furnace to bake them until the water content is 20%, thereby obtaining pretreated material blocks;

[0028] (2) The pretreated material block is put into a pure oxygen continuous gasification furnace, a composite catalyst is added, and then cooled to obtain gas a and tar;

[0029] (3) taking tar and adding a cracking catalyst, and then heating to obtain gas b;

[0030] (4) Gas a and gas b are introduced into a Fischer-Tropsch synthesis tower to synthesize biofuel gas, and biofuel is obtained after condensation.

[0031] In the step (1), the raw materials are composed of feces, straw and PET in a mass ratio of 7:1:0.5, wherein the feces are feces of humans, livestock and poultry, and the straw is wheat straw.

[0032] The specifications of the material block in step (1) are 2cm×5cm×2cm, and the temperature of the heating furnace is 150°C.

[0033] In the step (2), the mass ratio of the pretreated material block to the composite catalyst is 100:0.5, wherein the composite catalyst is composed of manganese ore powder and metal oxide in a mass ratio of 1:1, and the metal oxide is iron oxide.

[0034] In the step (2), the temperature inside the pure oxygen continuous gasification furnace decreases from bottom to top, that is, the temperature of the bottom layer is 600°C, the temperature of the top layer is 200°C, and the cooling temperature is 80°C.

[0035] In the step (3), the mass of the cracking catalyst accounts for 5% of the mass of the tar, wherein the cracking catalyst is Ni-Al2O3, and the heating temperature is 700°C.

[0036] The preparation method of Ni-Al2O3 is as follows: nickel nitrate hexahydrate, aluminum nitrate nonahydrate and ammonium carbonate are placed in a ball mill, taken out after ball milling for 1 hour, and then heated to 120°C for drying for 10 hours, and then transferred to a muffle furnace and calcined at 800°C for 3 hours to obtain Ni-Al2O3, wherein the mass ratio of nickel nitrate hexahydrate, aluminum nitrate nonahydrate and ammonium carbonate is 1:2:1.

[0037] In step (4), the temperature and pressure of the Fischer-Tropsch synthesis tower are 150° C. and 1 MPa respectively, and the composition of the biofuel gas is: 4 vol% C2-C8 hydrocarbons and 96 vol% C9 and above hydrocarbons.

[0038] The manganese ore powder is purchased from: manganese ore powder / Expedition Metallurgy-GY.

[0039] Example 2

[0040] A process for refining feces into biofuel, the process comprising the following steps:

[0041] (1) Pressing the raw materials into material blocks, and sending them into an oxygen-free heating furnace to bake them until the moisture content is 25%, thereby obtaining pretreated material blocks;

[0042] (2) The pretreated material block is put into a pure oxygen continuous gasification furnace, a composite catalyst is added, and then cooled to obtain gas a and tar;

[0043] (3) taking tar and adding a cracking catalyst, and then heating to obtain gas b;

[0044] (4) Gas a and gas b are introduced into a Fischer-Tropsch synthesis tower to synthesize biofuel gas, and biofuel is obtained after condensation.

[0045] In the step (1), the raw materials are composed of feces, straw and PET in a mass ratio of 8:1.2:0.8, wherein the feces are feces of humans, livestock and poultry, and the straw is composed of wheat straw and rice straw, wherein the mass ratio of wheat straw to rice straw is 1:1.

[0046] The specifications of the material block in step (1) are 2cm×5cm×2cm, and the temperature of the heating furnace is 175°C.

[0047] In the step (2), the mass ratio of the pretreated material block to the composite catalyst is 100:1, wherein the composite catalyst is composed of manganese ore powder and metal oxide in a mass ratio of 1:1, and the metal oxide is iron oxide.

[0048] In the step (2), the temperature inside the pure oxygen continuous gasification furnace decreases from bottom to top, that is, the temperature of the bottom layer is 600°C, the temperature of the top layer is 200°C, and the cooling temperature is 90°C.

[0049] In the step (3), the mass of the cracking catalyst accounts for 10% of the mass of the tar, wherein the cracking catalyst is Ni-Al2O3, and the heating temperature is 780°C.

[0050] The preparation method of Ni-Al2O3 is as follows: nickel nitrate hexahydrate, aluminum nitrate nonahydrate and ammonium carbonate are placed in a ball mill, taken out after ball milling for 1.5 hours, then heated to 120°C and dried for 11 hours, then transferred to a muffle furnace, and calcined at 800°C for 3 hours to obtain Ni-Al2O3, wherein the mass ratio of nickel nitrate hexahydrate, aluminum nitrate nonahydrate and ammonium carbonate is 1:2:1.

[0051] In step (4), the temperature and pressure of the Fischer-Tropsch synthesis tower are 225° C. and 2 MPa respectively, and the composition of the biofuel gas is: 6 vol% C2-C8 hydrocarbons and more than 94 vol% C9 and above hydrocarbons.

[0052] The manganese ore powder is purchased from: manganese ore powder / Expedition Metallurgy-GY.

[0053] Example 3

[0054] A process for refining feces into biofuel, the process comprising the following steps:

[0055] (1) Pressing the raw materials into material blocks, and baking them in an oxygen-free heating furnace until the water content is 30%, thereby obtaining pretreated material blocks;

[0056] (2) The pretreated material block is put into a pure oxygen continuous gasification furnace, a composite catalyst is added, and then cooled to obtain gas a and tar;

[0057] (3) taking tar and adding a cracking catalyst, and then heating to obtain gas b;

[0058] (4) Gas a and gas b are introduced into a Fischer-Tropsch synthesis tower to synthesize biofuel gas, and biofuel is obtained after condensation.

[0059] In the step (1), the raw materials are composed of feces, straw and PET in a mass ratio of 9.2:1.5:1, wherein the feces are feces of humans, livestock and poultry, and the straw is composed of wheat straw, rice straw, corn straw and cotton straw, wherein the mass ratio of wheat straw, rice straw, corn straw and cotton straw is 1:1:1:1.

[0060] The specifications of the material block in step (1) are 3cm×10cm×3cm, and the temperature of the heating furnace is 200°C.

[0061] In the step (2), the mass ratio of the pretreated material block to the composite catalyst is 100:1.2, wherein the composite catalyst is composed of manganese ore powder and metal oxide in a mass ratio of 1:1, and the metal oxide is copper oxide.

[0062] In the step (2), the temperature inside the pure oxygen continuous gasification furnace decreases from bottom to top, that is, the temperature of the bottom layer is 600°C, the temperature of the top layer is 200°C, and the cooling temperature is 100°C.

[0063] In the step (3), the mass of the cracking catalyst accounts for 15% of the mass of the tar, wherein the cracking catalyst is Ni-Al2O3, and the heating temperature is 850°C.

[0064] The preparation method of Ni-Al2O3 is as follows: nickel nitrate hexahydrate, aluminum nitrate nonahydrate and ammonium carbonate are placed in a ball mill, taken out after ball milling for 2 hours, and then heated to 120°C for drying for 12 hours, and then transferred to a muffle furnace and calcined at 800°C for 3 hours to obtain Ni-Al2O3, wherein the mass ratio of nickel nitrate hexahydrate, aluminum nitrate nonahydrate and ammonium carbonate is 1:2:1.

[0065] In step (4), the temperature and pressure of the Fischer-Tropsch synthesis tower are 300° C. and 3 MPa respectively, and the composition of the biofuel gas is: 8 vol% C2-C8 hydrocarbons and more than 92 vol% C9 and above hydrocarbons.

[0066] The manganese ore powder is purchased from: manganese ore powder / Expedition Metallurgy-GY.

[0067] Comparative Example 1

[0068] On the basis of Example 2, the feces in the raw material were removed and replaced with straw of equal mass, and other conditions were consistent with Example 2.

[0069] Comparative Example 2

[0070] On the basis of Example 2, the straw in the raw material was removed and replaced with an equal mass of feces, and the other conditions were the same as those in Example 2.

[0071] Comparative Example 3

[0072] On the basis of Example 2, PET in the raw material was removed and replaced with straw of equal mass, and other conditions were consistent with Example 2.

[0073] Comparative Example 4

[0074] Based on Example 2, a process for refining feces into biofuel is provided, wherein the process for refining feces into biofuel comprises the following steps:

[0075] (1) The raw materials are pressed into material blocks and put into a pure oxygen continuous gasification furnace, a composite catalyst is added, and then cooled to obtain gas a and tar;

[0076] (2) taking tar and adding a cracking catalyst, and then heating to obtain gas b;

[0077] (3) Gas a and gas b are introduced into a Fischer-Tropsch synthesis tower to synthesize biofuel gas, and biofuel is obtained after condensation.

[0078] In the step (1), the raw materials are composed of feces, straw and PET in a mass ratio of 8:1.2:0.8, wherein the feces are feces of humans, livestock and poultry, and the straw is composed of wheat straw and rice straw, wherein the mass ratio of wheat straw to rice straw is 1:1.

[0079] The specifications of the material block in step (1) are 2cm×5cm×2cm.

[0080] In the step (1), the mass ratio of the material block to the composite catalyst is 100:1, wherein the composite catalyst is composed of manganese ore powder and metal oxide in a mass ratio of 1:1, and the metal oxide is iron oxide.

[0081] In the step (1), the temperature inside the pure oxygen continuous gasification furnace decreases from bottom to top, that is, the temperature of the bottom layer is 600°C, the temperature of the top layer is 200°C, and the cooling temperature is 90°C.

[0082] In the step (2), the mass of the cracking catalyst accounts for 10% of the mass of the tar, wherein the cracking catalyst is Ni-Al2O3, and the heating temperature is 780°C.

[0083] The preparation method of Ni-Al2O3 is as follows: nickel nitrate hexahydrate, aluminum nitrate nonahydrate and ammonium carbonate are placed in a ball mill, taken out after ball milling for 1.5 hours, then heated to 120°C and dried for 11 hours, then transferred to a muffle furnace, and calcined at 800°C for 3 hours to obtain Ni-Al2O3, wherein the mass ratio of nickel nitrate hexahydrate, aluminum nitrate nonahydrate and ammonium carbonate is 1:2:1.

[0084] The manganese ore powder is purchased from: manganese ore powder / Expedition Metallurgy-GY.

[0085] In step (3), the temperature and pressure of the Fischer-Tropsch synthesis tower are 225° C. and 2 MPa respectively, and the composition of the biofuel gas is: 6 vol% C2-C8 hydrocarbons and more than 94 vol% C9 and above hydrocarbons.

[0086] Comparative Example 5

[0087] On the basis of Example 2, the manganese ore powder in the composite catalyst was removed and replaced with an equal mass of metal oxide, and other conditions were consistent with Example 2.

[0088] Comparative Example 6

[0089] On the basis of Example 2, the metal oxide in the composite catalyst was removed and replaced with an equal mass of manganese ore powder, and other conditions were consistent with Example 2.

[0090] Comparative Example 7

[0091] Based on Example 2, a process for refining feces into biofuel is provided, wherein the process for refining feces into biofuel comprises the following steps:

[0092] (1) Pressing the raw materials into material blocks, and sending them into an oxygen-free heating furnace to bake them until the moisture content is 25%, thereby obtaining pretreated material blocks;

[0093] (2) the pre-treated material block is put into a pure oxygen continuous gasification furnace, and a composite catalyst and a cracking catalyst are added at the same time to form a gas;

[0094] (3) The gas is passed into a Fischer-Tropsch synthesis tower to synthesize biofuel gas, and biofuel is obtained after condensation.

[0095] In the step (1), the raw materials are composed of feces, straw and PET in a mass ratio of 8:1.2:0.8, wherein the feces are feces of humans, livestock and poultry, and the straw is composed of wheat straw and rice straw, wherein the mass ratio of wheat straw to rice straw is 1:1.

[0096] The specifications of the material block in step (1) are 2cm×5cm×2cm, and the temperature of the heating furnace is 175°C.

[0097] In the step (2), the mass ratio of the pretreated material block to the composite catalyst is 100:1, wherein the composite catalyst is composed of manganese ore powder and metal oxide in a mass ratio of 1:1, and the metal oxide is iron oxide.

[0098] In the step (2), the temperature inside the pure oxygen continuous gasification furnace is 780° C., the mass of the cracking catalyst accounts for 4.2% of the mass of the pretreated material, and the cracking catalyst is Ni—Al 2 O 3 .

[0099] The preparation method of Ni-Al2O3 is as follows: nickel nitrate hexahydrate, aluminum nitrate nonahydrate and ammonium carbonate are placed in a ball mill, taken out after ball milling for 1.5 hours, then heated to 120°C and dried for 11 hours, then transferred to a muffle furnace, and calcined at 800°C for 3 hours to obtain Ni-Al2O3, wherein the mass ratio of nickel nitrate hexahydrate, aluminum nitrate nonahydrate and ammonium carbonate is 1:2:1.

[0100] In step (3), the temperature and pressure of the Fischer-Tropsch synthesis tower are 225° C. and 2 MPa respectively, and the composition of the biofuel gas is: 6 vol% C2-C8 hydrocarbons and more than 94 vol% C9 and above hydrocarbons.

[0101] The manganese ore powder is purchased from: manganese ore powder / Expedition Metallurgy-GY.

[0102] Performance Testing

[0103] The yields of the biofuels prepared in Examples 1-3 and Comparative Examples 1-7 were calculated respectively. Specifically, biofuel yield=mass of biofuel / mass of raw material×100%.

[0104] The above test results are shown in Table 1.

[0105] Table 1 Test results

[0106]

[0107] From the data analysis in Table 1, it can be concluded that the biofuel yield of Examples 1-3 is much greater than that of Comparative Examples 1-7. In Comparative Examples 1-3, the biofuel yield decreases when one of the feces, straw and PET in the raw materials is removed, so it can be concluded that the three raw materials have a synergistic enhanced gasification effect; in Comparative Example 4, the raw materials are not pretreated, and excessive moisture affects the gasification effect; in Comparative Examples 5-6, the composite catalyst only has manganese ore powder or metal oxide, resulting in a poor catalytic effect. The reason is that when the temperature is fixed, the change of the catalyst affects the pyrolysis of the raw materials, and when no metal oxide is added, the sulfur element adheres to the catalyst and affects the activity; in Comparative Example 7, the tar is not separated and cracked, and the cracking catalyst is directly put into the gasifier for heating. Since the composite catalyst cannot be combined with the sulfide in time, the activity of the cracking catalyst is reduced, and it needs to be gasified at more than 700°C continuously, which increases the loss of energy.

[0108] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A process for refining feces into biofuel, characterized in that: The process of refining feces into biofuel comprises the following steps: (1) Pressing the raw materials into material blocks, and sending them into an oxygen-free heating furnace to bake them until the water content is 20-30%, thereby obtaining pretreated material blocks; (2) The pretreated material block is put into a pure oxygen continuous gasification furnace, a composite catalyst is added, and then cooled to obtain gas a and tar; (3) taking tar and adding a cracking catalyst, and then heating to obtain gas b; (4) Gas a and gas b are introduced into a Fischer-Tropsch synthesis tower to synthesize biofuel gas, and biofuel is obtained after condensation; In step (1), the raw materials are composed of feces, straw and PET in a mass ratio of 7-9.2:1-1.5:0.5-1, wherein the feces are feces of humans, livestock, and poultry, and the straw is at least one of wheat straw, rice straw, corn straw, and cotton straw; In the step (2), the mass ratio of the pretreated material block to the composite catalyst is 100:0.5-1.2, wherein the composite catalyst is composed of manganese ore powder and metal oxide in a mass ratio of 1:1, and the metal oxide is iron oxide or copper oxide; In step (4), the temperature and pressure of the Fischer-Tropsch synthesis tower are 150-300° C. and 1-3 MPa, respectively. The composition of the biofuel gas is: 4-8 vol% C2-C8 hydrocarbons and more than 90 vol% C9 and above hydrocarbons.

2. The process for refining feces into biofuel according to claim 1, characterized in that: The specifications of the material block in step (1) are 2cm×5cm×2cm or 3cm×10cm×3cm, and the temperature of the heating furnace is 150-200°C.

3. The process for refining feces into biofuel according to claim 1, characterized in that: In the step (2), the temperature inside the pure oxygen continuous gasification furnace decreases from bottom to top, that is, the temperature of the bottom layer is 600°C, the temperature of the top layer is 200°C, and the cooling temperature is 80-100°C.

4. The process for refining feces into biofuel according to claim 1, characterized in that: In the step (3), the mass of the cracking catalyst accounts for 5-15% of the mass of the tar, wherein the cracking catalyst is Ni-Al2O3, and the heating temperature is 700-850°C.

5. The process for refining feces into biofuel according to claim 4, characterized in that: The preparation method of Ni-Al2O3 is as follows: nickel nitrate hexahydrate, aluminum nitrate nonahydrate and ammonium carbonate are placed in a ball mill, and the mixture is taken out after ball milling for 1-2 hours, and then the mixture is heated to 120°C and dried for 10-12 hours, and then the mixture is transferred to a muffle furnace and calcined at 800°C for 3 hours to obtain Ni-Al2O3, wherein the mass ratio of nickel nitrate hexahydrate, aluminum nitrate nonahydrate and ammonium carbonate is 1:2:1.

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