Methanation catalyst and preparation method thereof

Abstract

The invention relates to the technical field of catalysts, in particular to a methanation catalyst and a preparation method thereof.The methanation catalyst comprises a carrier and an active component loaded on the carrier; the carrier is prepared from one or more of Al2O3, Fe2O3, MgO, CaO and K2O; the active component at least comprises Ni; the catalyst is of a sheet structure. The catalyst with the sheet structure can realize methanation of CO and / or CO2 under normal pressure, has the capability of rapidly amplifying production, and is convenient for production and application; the catalyst has high stability and long service life; the catalyst is high in CO and / or CO2 conversion rate, high in methane yield and continuous and stable in gas output; the catalyst is high in water resistance and can work in a harsh environment; in addition, the preparation process is simple, the reproducibility is good, the cost is low, a new thought is provided for carbon sequestration and clean fuel synthesis, and industrial large-scale popularization and application are facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of catalysts, and in particular to a methanation catalyst and a preparation method thereof. Background Art

[0002] As an absolutely clean renewable energy, hydrogen has a wide range of applications, but it faces technical difficulties such as transportation and storage difficulties. Carbon dioxide is the source of global warming and a major emitter of industrial exhaust gas, and its pollution to the world environment is self-evident. Therefore, using carbon dioxide and hydrogen to synthesize methane fuel that is easy to transport has extraordinary practical significance.

[0003] Traditional synthetic methane fuel refers to a mixed gas mainly composed of CO and H2 obtained through incomplete redox reactions using carbon-rich solid raw materials (coal, coke, oil residue, biomass, etc.), liquid raw materials (heavy oil, naphtha) and gas raw materials (oilfield gas). After adjusting the ratio of H2 and CO through a shift reaction, it is purified to remove carbon dioxide, hydrogen sulfide and other refining processes, and is used as a raw gas for synthesizing natural gas, methanol, ammonia, alcohol, ether, oil, olefins and other products. However, the use of carbon-rich solid raw materials is not conducive to the protection of environmental energy. Secondly, biomass gasification has a low calorific value and contains some chemical components that are easy to cause catalyst poisoning. Tar is precipitated during the gasification process, and the synthesis gas contains a certain amount of ethylene, which affects the performance and life of the catalyst.

[0004] In view of this, the present invention is proposed. Summary of the invention

[0005] The object of the present invention is to provide a methanation catalyst and a preparation method thereof. The catalyst has high stability, high carbon monoxide / carbon dioxide conversion rate, high methane yield, simple preparation process, low cost, and is conducive to large-scale industrial promotion and use.

[0006] In a first aspect of the present invention, a methanation catalyst is provided, comprising: a carrier and an active component loaded on the carrier; the carrier comprises: one or more of Al2O3, Fe2O3, MgO, CaO, K2O; the active component comprises at least Ni; and the catalyst is a flaky structure.

[0007] Preferably, the carrier is Al2O3 and the active component is Ni.

[0008] Preferably, the mass ratio of the carrier to the active ingredient is (1-3):1, more preferably 1:1.

[0009] Preferably, the thickness of the catalyst is 2-4 mm, more preferably 3 mm.

[0010] Preferably, it further comprises: an auxiliary agent; the auxiliary agent comprises: one or more of Sr, Mn, V, Zr, and Ce.

[0011] Preferably, the additive is added in an amount of 1-10% of the mass of the catalyst (carrier and active components).

[0012] A second aspect of the present invention provides a method for preparing a methanation catalyst, comprising the following steps:

[0013] S1, mixing the carrier and the active ingredient as raw materials;

[0014] S2, casting the raw material of step S1 into a sheet-like embryo through extrusion molding;

[0015] S3. The embryo body is sintered at a high temperature and kept warm for a period of time, and then cooled to room temperature to obtain a methanation catalyst.

[0016] Preferably, in step S1, the carrier includes: one or more of Al2O3, Fe2O3, MgO, CaO, K2O; and the active component includes at least Ni.

[0017] Preferably, in step S1, the mass ratio of the carrier to the active component is (1-3):1, more preferably 1:1.

[0018] Preferably, in step S2, the thickness of the embryo body is 2-4 mm, more preferably 3 mm.

[0019] Preferably, in step S2, the embryo body has a shape of any one of a rectangle and a square.

[0020] Preferably, in step S3, the high temperature sintering temperature is 1200-1350° C., and the holding time is 5-8 hours.

[0021] A third aspect of the present invention provides a method for preparing a methanation catalyst, comprising the following steps:

[0022] S1, mixing the carrier, active ingredient and auxiliary agent as raw materials;

[0023] S2, casting the raw material of step S1 into a sheet-like embryo through extrusion molding;

[0024] S3. The embryo body is sintered at a high temperature and kept warm for a period of time, and then cooled to room temperature to obtain a methanation catalyst.

[0025] Preferably, in step S1, the carrier includes: one or more of Al2O3, Fe2O3, MgO, CaO, K2O; and the active component includes at least Ni.

[0026] Preferably, in step S1, the mass ratio of the carrier to the active component is (1-3):1, more preferably 1:1.

[0027] Preferably, in step S1, the amount of the additive added is 1-10% of the mass of the catalyst (carrier and active component).

[0028] Preferably, in step S2, the thickness of the embryo body is 2-4 mm, more preferably 3 mm.

[0029] Preferably, in step S2, the embryo body has a shape of any one of a rectangle and a square.

[0030] Preferably, in step S3, the high temperature sintering temperature is 1200-1350° C., and the holding time is 5-8 hours.

[0031] A fourth aspect of the present invention provides an application of a methanation catalyst, wherein the methanation catalyst is used in the methanation of CO and / or CO2.

[0032] A fifth aspect of the present invention provides a methanation reactor, which uses the above-mentioned methanation catalyst for the methanation of CO and / or CO2.

[0033] Specifically, the catalyst of the present invention is used in the methanation process of CO and / or CO2, wherein the methanation of CO is carried out by the following reaction equation:

[0034] CO+3H2→CH4+H2O

[0035] The methanation of CO2 proceeds through the following reaction equation:

[0036] CO2+4H2→CH4+2H2O

[0037] Preferably, in the methanation process of CO and / or CO2, the reaction temperature is controlled at 300-500°C.

[0038] The present invention has the following beneficial effects:

[0039] (1) The catalyst of the present invention has a sheet structure, can achieve methanation of CO and / or CO2 under normal pressure, and has the ability to rapidly scale up production, which is convenient for production and application.

[0040] (2) The active components of the catalyst of the present invention have a high degree of bonding with the carrier, a good structure-activity relationship, high stability, a long service life, and can operate continuously for up to a thousand hours.

[0041] (3) The catalyst of the present invention has a high carbon monoxide / carbon dioxide conversion rate, a high methane yield, and a continuous and stable gas output.

[0042] (4) The catalyst of the present invention has high water resistance and can work in harsh environments without the catalyst agglomerating when in contact with water.

[0043] (5) The preparation process of the present invention is simple, reproducible and low-cost, and provides a new idea for carbon fixation and clean fuel synthesis, which is conducive to large-scale promotion and use in industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0045] Figure 1 This is a schematic diagram of the structure of the methanation catalyst provided by the present invention. DETAILED DESCRIPTION

[0046] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0047] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form also includes the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0048] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] Example 1

[0050] like Figure 1 As shown, this embodiment provides a methanation catalyst, including: a carrier and an active component loaded on the carrier, the carrier is Al2O3, the active component is Ni, the catalyst is a square sheet structure, and the thickness of the catalyst is 3 mm.

[0051] In this embodiment, the mass ratio of the carrier to the active component is 1:1.

[0052] This embodiment also provides a method for preparing a methanation catalyst, comprising the following steps:

[0053] S1, mixing the carrier and the active ingredient as raw materials;

[0054] S2, casting the raw material of step S1 into an embryonic body with a rectangular sheet structure by extrusion molding;

[0055] S3. The embryo body is sintered at 1200-1350° C. and kept at this temperature for 5-8 hours, and then naturally cooled to room temperature to obtain a methanation catalyst.

[0056] Example 2

[0057] This embodiment provides a methanation catalyst, including: a carrier and an active component loaded on the carrier, the carrier is Al2O3, the active component is Ni, the catalyst is a square sheet structure, and the thickness of the catalyst is 3 mm.

[0058] In this embodiment, the mass ratio of the carrier to the active component is 2:1.

[0059] This embodiment also provides a method for preparing a methanation catalyst, comprising the following steps:

[0060] S1, mixing the carrier and the active ingredient as raw materials;

[0061] S2, casting the raw material of step S1 into an embryonic body with a rectangular sheet structure by extrusion molding;

[0062] S3. The embryo body is sintered at 1200-1350° C. and kept at this temperature for 5-8 hours, and then naturally cooled to room temperature to obtain a methanation catalyst.

[0063] Example 3

[0064] This embodiment provides a methanation catalyst, including: a carrier and an active component loaded on the carrier, the carrier is Al2O3, the active component is Ni, the catalyst is a square sheet structure, and the thickness of the catalyst is 3 mm.

[0065] In this embodiment, the mass ratio of the carrier to the active component is 3:1.

[0066] This embodiment also provides a method for preparing a methanation catalyst, comprising the following steps:

[0067] S1, mixing the carrier and the active ingredient as raw materials;

[0068] S2, casting the raw material of step S1 into an embryonic body with a rectangular sheet structure by extrusion molding;

[0069] S3. The embryo body is sintered at 1200-1350° C. and kept at this temperature for 5-8 hours, and then naturally cooled to room temperature to obtain a methanation catalyst.

[0070] Example 4

[0071] This embodiment provides a methanation catalyst, including: a carrier and an active component loaded on the carrier, the carrier is Al2O3, the active component is Ni, the catalyst is a square sheet structure, and the thickness of the catalyst is 2 mm.

[0072] In this embodiment, the mass ratio of the carrier to the active component is 1:1.

[0073] This embodiment also provides a method for preparing a methanation catalyst, comprising the following steps:

[0074] S1, mixing the carrier and the active ingredient as raw materials;

[0075] S2, casting the raw material of step S1 into an embryonic body with a rectangular sheet structure by extrusion molding;

[0076] S3. The embryo body is sintered at 1200-1350° C. and kept at this temperature for 5-8 hours, and then naturally cooled to room temperature to obtain a methanation catalyst.

[0077] Example 5

[0078] This embodiment provides a methanation catalyst, including: a carrier and an active component loaded on the carrier, the carrier is Al2O3, the active component is Ni, the catalyst is a square sheet structure, and the thickness of the catalyst is 4 mm.

[0079] In this embodiment, the mass ratio of the carrier to the active component is 1:1.

[0080] This embodiment also provides a method for preparing a methanation catalyst, comprising the following steps:

[0081] S1, mixing the carrier and the active ingredient as raw materials;

[0082] S2, casting the raw material of step S1 into an embryonic body with a rectangular sheet structure by extrusion molding;

[0083] S3. The embryo body is sintered at 1200-1350° C. and kept at this temperature for 5-8 hours, and then naturally cooled to room temperature to obtain a methanation catalyst.

[0084] Example 6

[0085] This embodiment provides a methanation catalyst, including: a carrier and an active component loaded on the carrier, the carrier is Al2O3, the active component is Ni, the catalyst is a rectangular sheet structure, and the thickness of the catalyst is 3 mm.

[0086] In this embodiment, the mass ratio of the carrier to the active component is 1:1.

[0087] This embodiment also provides a method for preparing a methanation catalyst, comprising the following steps:

[0088] S1, mixing the carrier and the active ingredient as raw materials;

[0089] S2, casting the raw material of step S1 into an embryonic body with a rectangular sheet structure by extrusion molding;

[0090] S3. The embryo body is sintered at 1200-1350° C. and kept at this temperature for 5-8 hours, and then naturally cooled to room temperature to obtain a methanation catalyst.

[0091] Example 7

[0092] This embodiment provides a methanation catalyst, including: a carrier and an active component loaded on the carrier, the carrier is Fe2O3, the active component is Ni, the catalyst is a square sheet structure, and the thickness of the catalyst is 3 mm.

[0093] In this embodiment, the mass ratio of the carrier to the active component is 1:1.

[0094] This embodiment also provides a method for preparing a methanation catalyst, comprising the following steps:

[0095] S1, mixing the carrier and the active ingredient as raw materials;

[0096] S2, casting the raw material of step S1 into an embryonic body with a rectangular sheet structure by extrusion molding;

[0097] S3. The embryo body is sintered at 1200-1350° C. and kept at this temperature for 5-8 hours, and then naturally cooled to room temperature to obtain a methanation catalyst.

[0098] Example 8

[0099] This embodiment provides a methanation catalyst, including: a carrier and an active component loaded on the carrier, the carrier is MgO, the active component is Ni, the catalyst is a square sheet structure, and the thickness of the catalyst is 3 mm.

[0100] In this embodiment, the mass ratio of the carrier to the active component is 1:1.

[0101] This embodiment also provides a method for preparing a methanation catalyst, comprising the following steps:

[0102] S1, mixing the carrier and the active ingredient as raw materials;

[0103] S2, casting the raw material of step S1 into an embryonic body with a rectangular sheet structure by extrusion molding;

[0104] S3. The embryo body is sintered at 1200-1350° C. and kept at this temperature for 5-8 hours, and then naturally cooled to room temperature to obtain a methanation catalyst.

[0105] Example 9

[0106] This embodiment provides a methanation catalyst, including: a carrier and an active component loaded on the carrier, the carrier is CaO, the active component is Ni, the catalyst is a square sheet structure, and the thickness of the catalyst is 3 mm.

[0107] In this embodiment, the mass ratio of the carrier to the active component is 1:1.

[0108] This embodiment also provides a method for preparing a methanation catalyst, comprising the following steps:

[0109] S1, mixing the carrier and the active ingredient as raw materials;

[0110] S2, casting the raw material of step S1 into an embryonic body with a rectangular sheet structure by extrusion molding;

[0111] S3. The embryo body is sintered at 1200-1350° C. and kept at this temperature for 5-8 hours, and then naturally cooled to room temperature to obtain a methanation catalyst.

[0112] Example 10

[0113] This embodiment provides a methanation catalyst, including: a carrier and an active component loaded on the carrier, the carrier is K2O, the active component is Ni, the catalyst is a square sheet structure, and the thickness of the catalyst is 3 mm.

[0114] In this embodiment, the mass ratio of the carrier to the active component is 1:1.

[0115] This embodiment also provides a method for preparing a methanation catalyst, comprising the following steps:

[0116] S1, mixing the carrier and the active ingredient as raw materials;

[0117] S2, casting the raw material of step S1 into an embryonic body with a rectangular sheet structure by extrusion molding;

[0118] S3. The embryo body is sintered at 1200-1350° C. and kept at this temperature for 5-8 hours, and then naturally cooled to room temperature to obtain a methanation catalyst.

[0119] Embodiment 11

[0120] This embodiment provides a methanation catalyst, including: a carrier, an active component loaded on the carrier, and an auxiliary agent, the carrier is Al2O3, the active component is Ni, the auxiliary agent is Sr, the catalyst is a square sheet structure, and the thickness of the catalyst is 3 mm.

[0121] In this embodiment, the mass ratio of the carrier to the active component is 1:1, and the added amount of Sr is 1% of the mass of the catalyst (carrier and active component).

[0122] This embodiment also provides a method for preparing a methanation catalyst, comprising the following steps:

[0123] S1, mixing the carrier, active ingredient and auxiliary agent as raw materials;

[0124] S2, casting the raw material of step S1 into an embryonic body with a rectangular sheet structure by extrusion molding;

[0125] S3. The embryo body is sintered at 1200-1350° C. and kept at this temperature for 5-8 hours, and then naturally cooled to room temperature to obtain a methanation catalyst.

[0126] Example 12

[0127] This embodiment provides a methanation catalyst, including: a carrier, an active component loaded on the carrier, and an auxiliary agent, the carrier is Al2O3, the active component is Ni, the auxiliary agent is Mn, the catalyst is a square sheet structure, and the thickness of the catalyst is 3 mm.

[0128] In this embodiment, the mass ratio of the carrier to the active component is 1:1, and the added amount of Mn is 3% of the mass of the catalyst (carrier and active component).

[0129] This embodiment also provides a method for preparing a methanation catalyst, comprising the following steps:

[0130] S1, mixing the carrier, active ingredient and auxiliary agent as raw materials;

[0131] S2, casting the raw material of step S1 into an embryonic body with a rectangular sheet structure by extrusion molding;

[0132] S3. The embryo body is sintered at 1200-1350° C. and kept at this temperature for 5-8 hours, and then naturally cooled to room temperature to obtain a methanation catalyst.

[0133] Example 13

[0134] This embodiment provides a methanation catalyst, including: a carrier, an active component loaded on the carrier, and an additive, the carrier is Al2O3, the active component is Ni, the additive is V, the catalyst is a square sheet structure, and the thickness of the catalyst is 3 mm.

[0135] In this embodiment, the mass ratio of the carrier to the active component is 1:1, and the added amount of V is 5% of the mass of the catalyst (carrier and active component).

[0136] This embodiment also provides a method for preparing a methanation catalyst, comprising the following steps:

[0137] S1, mixing the carrier, active ingredient and auxiliary agent as raw materials;

[0138] S2, casting the raw material of step S1 into an embryonic body with a rectangular sheet structure by extrusion molding;

[0139] S3. The embryo body is sintered at 1200-1350° C. and kept at this temperature for 5-8 hours, and then naturally cooled to room temperature to obtain a methanation catalyst.

[0140] Embodiment 14

[0141] This embodiment provides a methanation catalyst, including: a carrier, an active component loaded on the carrier, and an auxiliary agent, the carrier is Al2O3, the active component is Ni, the auxiliary agent is Zr, the catalyst is a square sheet structure, and the thickness of the catalyst is 3 mm.

[0142] In this embodiment, the mass ratio of the carrier to the active component is 1:1, and the amount of Zr added is 8% of the mass of the catalyst (carrier and active component).

[0143] This embodiment also provides a method for preparing a methanation catalyst, comprising the following steps:

[0144] S1, mixing the carrier, active ingredient and auxiliary agent as raw materials;

[0145] S2, casting the raw material of step S1 into an embryonic body with a rectangular sheet structure by extrusion molding;

[0146] S3. The embryo body is sintered at 1200-1350° C. and kept at this temperature for 5-8 hours, and then naturally cooled to room temperature to obtain a methanation catalyst.

[0147] Embodiment 15

[0148] This embodiment provides a methanation catalyst, including: a carrier, an active component and an auxiliary agent loaded on the carrier, the carrier is Al2O3, the active component is Ni, the auxiliary agent is Ce, the catalyst is a square sheet structure, and the thickness of the catalyst is 3 mm.

[0149] In this embodiment, the mass ratio of the carrier to the active component is 1:1, and the amount of Ce added is 10% of the mass of the catalyst (carrier and active component).

[0150] This embodiment also provides a method for preparing a methanation catalyst, comprising the following steps:

[0151] S1, mixing the carrier, active ingredient and auxiliary agent as raw materials;

[0152] S2, casting the raw material of step S1 into an embryonic body with a rectangular sheet structure by extrusion molding;

[0153] S3. The embryo body is sintered at 1200-1350° C. and kept at this temperature for 5-8 hours, and then naturally cooled to room temperature to obtain a methanation catalyst.

[0154] Example 16

[0155] This embodiment provides a methanation reactor, which uses the methanation catalyst of any one of Embodiments 1-15 for the methanation of CO and / or CO2.

[0156] Specifically, CO / CO2 and H2 are introduced into a fuel mixer to mix CO2 / CO and H2 evenly, and then introduced into a sheet-like methanogenic catalyst, where CO / CO2 and H2 are synthesized into methane and water, and the tail gas is dried and collected to obtain methane. According to the Arrhenius equation, the activation energy of the reaction is reduced during operation, the reaction pathway is changed, and the reaction rate is increased.

[0157] The performance of the methanation catalyst was evaluated by using a methanation reactor prepared using the catalyst of Example 1. No gas was introduced into the air electrode, while CO2 and H2 at different gas ratios were introduced into the fuel electrode. The CO2 conversion rate and CH4 yield obtained by the test are shown in Table 1.

[0158] Table 1 CO2 conversion rate and CH4 yield

[0159] <![CDATA[H2:CO2 molar ratio]]> Reaction temperature (℃) <![CDATA[CO2 conversion rate (%)]]> <![CDATA[CH4 yield (%)]]> 2:1 350 10 20 2:1 400 16 30 3:1 300 50 60 3:1 350 60 73 3:1 400 70 82 4:1 300 58 72 5:1 350 80 83 4:1 350 95 98 4:1 400 90 92 4:1 450 83 86 4:1 500 80 70

[0160] It can be seen from the table that when different gas volume ratios of CO2 and H2 are introduced into the methanation reactor, the CO2 conversion rate can reach up to 95%, and the CH4 yield can reach up to 98%, indicating that the use of a sheet-like methanation catalyst can make the CO2 conversion almost complete, and the CH4 yield is close to 100%, which is conducive to large-scale promotion and use.

[0161] The sheet-like methanation reactor is used to carry out a catalytic reaction at a temperature of 350°C, and hydrogen, CO2, and CO are introduced in a ratio of 4:0.5:1, and water is reacted under room temperature dew point conditions. When the water vapor content is 3%, the CO2 conversion rate is 85%, the CO conversion rate is 90%, and the methane yield is 93%; when the water vapor content is 5%, the CO2 conversion rate is 84.8%, the CO conversion rate is 91%, and the methane yield is 93.5%; when the water vapor content is 10%, the CO2 conversion rate is 85.3%, the CO conversion rate is 90.5%, and the methane yield is 93.3%. When the water vapor content reaches 10%, the CO / CO2 conversion rate and the methane yield are still maintained at a high level, indicating that the catalyst of the present invention has excellent water resistance, can work in harsh environments, and will not agglomerate when the catalyst encounters water.

[0162] The sheet-like methanation reactor was used for catalytic reaction at a temperature of 350°C, and hydrogen and carbon dioxide were introduced in a ratio of 4:1. After 50 hours of operation, the CO2 conversion rate was 88% and the methane yield was 94%; after 100 hours of operation, the CO2 conversion rate was 87.5% and the methane yield was 93.7%; after 500 hours of operation, the CO2 conversion rate was 88.3% and the methane yield was 94.5%; after 1000 hours of operation, the CO2 conversion rate was 87.6% and the methane yield was 93.8%. After 1000 hours of long-term durability test, the conversion rate fluctuated by no more than 1%, indicating that it has long-term durability and stability.

[0163] In addition, the performance of the methanation catalysts of Examples 2-15 in terms of CO / CO2 conversion and CH4 yield was tested to be substantially consistent with that of Example 1.

[0164] In summary, the active components of the catalyst of the present invention have a high degree of bonding with the carrier, a good structure-activity relationship, and high stability; the catalyst of the present invention has a high carbon monoxide / carbon dioxide conversion rate, a high methane yield, and continuous and stable gas output; the catalyst of the present invention has high water resistance and can work in harsh environments without the phenomenon of catalyst agglomeration when encountering water; the preparation process of the present invention is simple, has good reproducibility, and is low in cost, and provides a new idea for carbon fixation and clean fuel synthesis, which is conducive to large-scale promotion and use in industry.

[0165] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A methanation catalyst, characterized in that: include: A carrier and an active component loaded on the carrier; the carrier comprises one or more of Al2O3, Fe2O3, MgO, CaO, and K2O; the active component comprises at least Ni; and the catalyst is a flaky structure.

2. The methanation catalyst according to claim 1, characterized in that The mass ratio of the carrier to the active component is (1-3):

1.

3. The methanation catalyst according to claim 1, characterized in that The thickness of the catalyst is 2-4 mm.

4. The methanation catalyst according to claim 1, characterized in that Also includes: Auxiliary agent: The auxiliary agent includes: one or more of Sr, Mn, V, Zr, and Ce.

5. The method for preparing a methanation catalyst according to any one of claims 1 to 4, characterized in that: The steps include: S1, mixing the carrier and the active ingredient as raw materials; S2, casting the raw material of step S1 into a sheet-like embryo through extrusion molding; S3. The embryo body is sintered at a high temperature and kept warm for a period of time, and then cooled to room temperature to obtain a methanation catalyst.

6. The method for preparing a methanation catalyst according to claim 5, characterized in that: In step S1, the mass ratio of the carrier to the active component is (1-3):

1.

7. The method for preparing a methanation catalyst according to claim 5, characterized in that: In step S2, the thickness of the embryo body is 2-4 mm.

8. The method for preparing a methanation catalyst according to claim 5, characterized in that: In step S2, the shape of the embryo is any one of a rectangle and a square.

9. The method for preparing a methanation catalyst according to claim 5, characterized in that: In step S3, the high temperature sintering temperature is 1200-1350° C., and the heat preservation time is 5-8 hours.

10. A methanation reactor, characterized in that: The methanation catalyst according to any one of claims 1 to 4 is used in the methanation of CO and / or CO2.

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