A nickel-samarium bimetallic synergistic / MCM-41 molecular sieve catalyst and its preparation method and application

Abstract

The present invention discloses a nickel-samarium bimetallic synergistic / MCM-41 molecular sieve catalyst and its preparation method and application. The catalyst includes a carrier and an active component loaded on the carrier, the carrier is an MCM-41 molecular sieve, and the active components are nickel and samarium. Compared with other nickel-based catalysts, the catalyst of the present invention enhances the interaction between the active component and the carrier through the synergistic effect of the nickel-samarium bimetallic, improves the dispersion of the active metal, and enhances the anti-sintering ability of the active metal; and the catalyst surface has a high oxygen vacancy concentration, which is conducive to promoting the activation of CO2 and increasing the number of active oxygen species on the catalyst surface, thereby promoting the removal of carbon deposits. Therefore, the catalyst has good anti-sintering, anti-carbon deposition ability and high catalytic stability, meeting the requirements for the use of industrial catalysts.

Description

Technical Field

[0001] The present invention relates to the field of catalyst technology, and in particular to a nickel-samarium bimetallic synergistic / MCM-41 molecular sieve catalyst and a preparation method and application thereof. Background Art

[0002] Over 30 gigatons of CO₂ are released into the atmosphere annually, contributing to serious environmental problems such as global warming. Furthermore, methane (CH₄), another major greenhouse gas, is further exacerbated by the unrestricted release of natural gas from permafrost and shale gas development. Therefore, it is crucial to take effective measures to transform and utilize these two greenhouse gases as resources.

[0003] The dry reforming of carbon dioxide and methane (DRM) was first widely studied in the early 20th century. In 1946, researchers first discovered that cobalt-based catalysts could promote the dry reforming reaction of CH4 and CO2, and pointed out that improving the stability of cobalt-based catalysts is one of the important factors for achieving efficient DRM. In 1958, other studies further showed that Co / La2O3-SiO2 catalysts with Co and La2O3 as active components and supported on SiO2 carriers showed high catalytic activity and stability in the temperature range of 1073K to 1173K. Since then, in the optimization research of DRM catalysts, it was found that compared with traditional precious metal catalysts (such as Pt, Rh), economical and efficient Ni-based and Co-based catalysts can show excellent methane activation performance and anti-carbon deposition ability at higher temperatures, thus becoming a research hotspot in this field.

[0004] However, numerous studies have shown that Ni-based catalysts still face common challenges in DRM reactions, including sintering and carbon deposition, which can lead to catalyst deactivation and poor stability. Therefore, designing catalysts to improve their resistance to carbon deposition and sintering is crucial for the further industrialization of methane dry reforming and the large-scale production of syngas. Summary of the Invention

[0005] The main purpose of the present invention is to provide a nickel-samarium bimetallic synergistic / MCM-41 molecular sieve catalyst with good anti-sintering, anti-carbon deposition and catalytic stability, as well as a preparation method and application thereof.

[0006] To achieve the above objectives, the present invention provides a nickel-samarium bimetallic synergistic / MCM-41 molecular sieve catalyst, comprising a carrier and an active component supported on the carrier, wherein the carrier is MCM-41 molecular sieve and the active components are nickel and samarium.

[0007] Furthermore, the nickel content is 5-20 wt%, the samarium content is 1-20 wt%, and the balance is MCM-41 molecular sieve.

[0008] The present invention also provides a method for preparing the above-mentioned nickel-samarium bimetallic synergistic / MCM-41 molecular sieve catalyst, comprising the following steps:

[0009] (1) dissolving nickel and samarium precursor salts in deionized water, adding ammonia water to obtain an alkaline nickel-samarium ammonia complex solution, adding MCM-41 molecular sieves to the alkaline nickel-samarium ammonia complex solution, then heating and stirring under closed conditions, and then heating and evaporating until the pH of the solution reaches neutrality to obtain a reaction mixture;

[0010] (2) The reaction mixture is centrifuged, the obtained solid is dried, ground into powder, and finally calcined in an air atmosphere to obtain the nickel-samarium bimetallic synergistic / MCM-41 molecular sieve catalyst.

[0011] Furthermore, in step (1), the amount of ammonia added is such that the pH value reaches 10 to 12, and the stirring treatment condition is room temperature for 8 to 12 hours.

[0012] Furthermore, in step (1), the temperature of heating and evaporation is 60 to 90°C.

[0013] Furthermore, in step (2), the drying treatment conditions are a temperature of 80 to 110° C. and a time of 8 to 12 hours.

[0014] Furthermore, in step (2), the specific process of the calcination treatment is: heating the temperature to 550-700° C. at a heating rate of 1-5° C. / min, and then calcining at this temperature for 2-6 hours.

[0015] The present invention also provides the use of the above-mentioned nickel-samarium bimetallic synergistic / MCM-41 molecular sieve catalyst in catalytic methane dry reforming to produce synthesis gas.

[0016] The present invention also provides a method for catalytic methane dry reforming to produce synthesis gas, comprising the following steps: reducing the above-mentioned catalyst in a 10 vol% H2 / N2 atmosphere at a temperature of 550-750°C for 2-4 hours, then mixing it with inert silicon carbide, and catalytically conducting a methane dry reforming reaction to produce synthesis gas in a reactor.

[0017] Furthermore, the catalyst and inert silicon carbide are mixed in a mass ratio of 1:2-5 by solid-phase grinding for 10-15 minutes. The reaction conditions are: a molar ratio of CH4 to CO2 in the reaction feed of 1-2, a gas feed space velocity of 40,000-120,000 mL·h-1·gcat-1, a catalyst dosage of 0.05-0.5 g, and a reaction temperature of 550-850°C. During the implementation of the present invention, the inventors discovered that under these reaction conditions, the catalyst exhibited a high methane / carbon dioxide conversion rate exceeding 80% in an 800-hour catalytic methane dry reforming reaction to produce synthesis gas, with an H2 / CO ratio in the synthesis gas of 0.8-1.2.

[0018] MCM-41 molecular sieve has a two-dimensional hexagonal structure and a large specific surface area. Its unique structural characteristics help to distribute active metals to form more active sites.

[0019] Compared with nickel / MCM-41 molecular sieve, the synergistic effect of nickel-samarium bimetallic catalyst not only improves the anti-sintering ability of active metal through the interaction between active components and carriers, but also the high oxygen vacancy concentration is beneficial to promote the activation of CO2 and increase the number of active oxygen species on the catalyst surface, thereby promoting the removal of carbon deposits.

[0020] Samarium, as a lanthanide metal, has good redox properties and high oxygen mobility. The present invention prepares a nickel-samarium bimetallic synergistic / MCM-41 molecular sieve catalyst, which is beneficial to promoting the removal of carbon on the catalyst surface, while enhancing the strong interaction between the metal and the carrier and realizing the anchoring of active metal nickel.

[0021] The beneficial effects of the present invention are embodied in:

[0022] 1. The catalyst of the present invention has the characteristics of green economy and high structural stability. When used in the catalytic CH4-CO2 reforming reaction to produce synthesis gas, it exhibits a high methane / carbon dioxide conversion rate of more than 80% in the 800-h catalytic methane dry reforming reaction to produce synthesis gas, and the H2 / CO ratio in the synthesis gas is 0.8 to 1.2.

[0023] 2. The catalyst of the present invention uses nickel samarium as the active metal, which can ensure that the catalyst has high activity in cracking methane C-H bonds. The use of the MCM-41 molecular sieve carrier saves catalyst preparation costs while promoting the dispersion of the active components.

[0024] 3. Compared to other nickel-based catalysts, the catalyst of this invention enhances the interaction between the active component and the support through the synergistic effect of the nickel-samarium bimetallic compound, improving the dispersion of the active metal and enhancing its resistance to sintering. Furthermore, the catalyst surface has a high concentration of oxygen vacancies, which promotes CO activation and increases the number of active oxygen species on the catalyst surface, thereby facilitating the removal of carbon deposits. As a result, the catalyst exhibits excellent resistance to sintering and carbon deposition, as well as high catalytic stability, meeting the requirements for industrial catalyst use.

[0025] 4. The catalyst of the present invention is used in the catalytic methane dry reforming reaction to produce synthesis gas, which can significantly enhance the catalytic adsorption and activation ability of CH4 and CO2 molecules, has high CH4 and CO2 conversion rates, and shows good prospects for industrial application. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The XRD patterns of the catalysts prepared in Example 2 and Comparative Example 1 are shown;

[0027] Figure 2 The catalyst prepared in Example 2 and the N2 adsorption-desorption isotherm of MCM-41 molecular sieve are shown in FIG.

[0028] Figure 3 The pore size distribution diagram of the catalyst prepared in Example 2 and the MCM-41 molecular sieve;

[0029] Figure 4 TEM images of the catalysts prepared in Example 2 and Comparative Example 1;

[0030] Figure 5 The EPR diagrams of the catalysts prepared in Example 2 and Comparative Example 1 are shown. DETAILED DESCRIPTION

[0031] In order to make the technical solution of the present invention more clearly understood by those skilled in the art, the following examples are given for illustration. It should be noted that the following examples do not limit the scope of protection claimed by the present invention.

[0032] Unless otherwise specified, the raw materials, reagents, or devices used in the following examples can be obtained from conventional commercial sources or by existing known methods; unless otherwise specified, the methods used in the examples of the present invention are methods known to those skilled in the art.

[0033] MCM-41 molecular sieve was purchased from Aladdin Biochemical Technology Co., Ltd., with a pore size of 2.5 nm, a particle size of 1-2 μm, and a specific surface area (m 2 / g):600-800.

[0034] Inert silicon carbide was purchased from Shanghai MacLean Biochemical Technology Co., Ltd. with a particle size of 200 mesh.

[0035] Example 1

[0036] Preparation of Ni-Samarium Bimetallic Synergistic / MCM-41 Molecular Sieve Catalyst

[0037] The nickel-samarium bimetallic synergistic / MCM-41 molecular sieve catalyst prepared in this embodiment has an active component nickel content of 5 wt% and a samarium content of 3 wt%, and the remaining component is an MCM-41 molecular sieve carrier. The preparation method is as follows:

[0038] (1) 0.2692 g of nickel nitrate hexahydrate and 0.0963 g of samarium nitrate hexahydrate were weighed and dissolved in 75 mL of deionized water. After thorough stirring to form a uniform solution, 28% ammonia water was added to adjust the pH to 10. 1 g of an MCM-41 molecular sieve carrier was then added, the mixture was sealed with plastic wrap, and stirred at 300 r / min at room temperature for 8 h. The mixture was then heated at 90° C. to evaporate the ammonia and water until the solution became neutral, thereby obtaining a reaction mixture.

[0039] (2) The reaction mixture was centrifuged and washed, and the obtained solid was dried at 80°C for 12 h, then ground into powder, and finally placed in a 100 mL / min air atmosphere and heated to 600°C at a rate of 1°C / min and calcined at a constant temperature for 6 h. After naturally cooling to room temperature, a nickel-samarium bimetallic synergistic / MCM-41 molecular sieve catalyst with a nickel content of 5 wt% and a samarium content of 3 wt% was obtained, which was recorded as 5Ni3Sm / MCM-41.

[0040] Example 2

[0041] Preparation of Ni-Samarium Bimetallic Synergistic / MCM-41 Molecular Sieve Catalyst

[0042] The nickel-samarium bimetallic synergistic / MCM-41 molecular sieve catalyst prepared in this embodiment has an active component nickel content of 10 wt %, a samarium content of 1 wt %, and the remaining component is an MCM-41 molecular sieve carrier. The preparation method is as follows:

[0043] (1) Weighing 0.5548 g of nickel nitrate hexahydrate and 0.0331 g of samarium nitrate hexahydrate were dissolved in 75 mL of deionized water, and the mixture was thoroughly stirred to form a uniform solution. 28% ammonia water was added to adjust the pH to 12, and 1 g of MCM-41 molecular sieve carrier was added. The mixture was sealed with plastic wrap and stirred at 300 r / min at room temperature for 12 h. The mixture was then heated and evaporated at 80° C. until the solution became neutral to obtain a reaction mixture.

[0044] (2) The reaction mixture was centrifuged and washed, and the obtained solid was dried at 105°C for 12 h, then ground into powder, and finally placed in a 100 mL / min air atmosphere and heated to 550°C at a heating rate of 4°C / min and calcined at a constant temperature for 5 h. After naturally cooling to room temperature, a nickel-samarium bimetallic synergistic / MCM-41 molecular sieve catalyst with a nickel content of 10 wt% and a samarium content of 1 wt% was obtained, which was recorded as 10Ni1Sm / MCM-41.

[0045] Example 3

[0046] Preparation of Ni-Samarium Bimetallic Synergistic / MCM-41 Molecular Sieve Catalyst

[0047] The nickel-samarium bimetallic synergistic / MCM-41 molecular sieve catalyst prepared in this embodiment has an active component nickel content of 12 wt %, a samarium content of 20 wt %, and the remaining component is an MCM-41 molecular sieve carrier. The preparation method is as follows:

[0048] (1) Weigh 0.8744 g of nickel nitrate hexahydrate and 0.8694 g of samarium nitrate hexahydrate and dissolve them in 75 mL of deionized water. After thorough stirring to form a uniform solution, add 28% ammonia water to adjust the pH to 11, then add 1 g of MCM-41 molecular sieve carrier, seal with plastic wrap, stir at 300 r / min at room temperature for 9 h, and then heat and evaporate at 70° C. until the solution becomes neutral to obtain a reaction mixture;

[0049] (2) The reaction mixture was centrifuged and washed, and the obtained solid was dried at 110°C for 8 h, then ground into powder, and finally placed in a 100 mL / min air atmosphere and heated to 650°C at a rate of 2°C / min and calcined at a constant temperature for 3 h. After naturally cooling to room temperature, a nickel-samarium bimetallic synergistic / MCM-41 molecular sieve catalyst with a nickel content of 12 wt% and a samarium content of 20 wt% was obtained, which was recorded as 12Ni20Sm / MCM-41.

[0050] Example 4

[0051] Preparation of Ni-Samarium Bimetallic Synergistic / MCM-41 Molecular Sieve Catalyst

[0052] The nickel-samarium bimetallic synergistic / MCM-41 molecular sieve catalyst prepared in this embodiment has an active component nickel content of 10 wt %, a samarium content of 1 wt %, and the remaining component is an MCM-41 molecular sieve carrier. The preparation method is as follows:

[0053] (1) Weigh 0.9908 g of nickel nitrate hexahydrate and 0.3941 g of samarium nitrate hexahydrate and dissolve them in 75 mL of deionized water. After thorough stirring to form a uniform solution, add 28% ammonia water to adjust the pH to 10, then add 1 g of MCM-41 molecular sieve carrier, seal with plastic wrap, stir at 300 r / min at room temperature for 10 h, and then heat and evaporate at 60° C. until the solution becomes neutral to obtain a reaction mixture;

[0054] (2) The reaction mixture was centrifuged and washed, and the obtained solid was dried at 90°C for 11 hours, then ground into powder, and finally placed in an air atmosphere of 100 mL / min and heated to 600°C at a heating rate of 5°C / min and calcined at a constant temperature for 4 hours. After naturally cooling to room temperature, a nickel-samarium bimetallic synergistic / MCM-41 molecular sieve catalyst with a nickel content of 10 wt% and a samarium content of 1 wt% was obtained, which was recorded as 15Ni10Sm / MCM-41.

[0055] Example 5

[0056] Preparation of Ni-Samarium Bimetallic Synergistic / MCM-41 Molecular Sieve Catalyst

[0057] The nickel-samarium bimetallic synergistic / MCM-41 molecular sieve catalyst prepared in this embodiment has an active component nickel content of 20 wt %, a samarium content of 5 wt %, and the remaining component is an MCM-41 molecular sieve carrier. The preparation method is as follows:

[0058] (1) 1.3212 g of nickel nitrate hexahydrate and 0.1971 g of samarium nitrate hexahydrate were weighed and dissolved in 75 mL of deionized water. After thorough stirring to form a uniform solution, 28% ammonia water was added to adjust the pH to 12. 1 g of MCM-41 molecular sieve carrier was then added, the mixture was sealed with plastic wrap, and stirred at 300 r / min at room temperature for 11 h. The mixture was then heated and evaporated at 80° C. until the solution became neutral to obtain a reaction mixture.

[0059] (2) The reaction mixture was centrifuged and washed, and the obtained solid was dried at 100°C for 10 h, then ground into powder, and finally placed in an air atmosphere of 100 mL / min and heated to 700°C at a heating rate of 3°C / min and calcined at a constant temperature for 2 h. After naturally cooling to room temperature, a nickel-samarium bimetallic synergistic / MCM-41 molecular sieve catalyst with a nickel content of 10 wt% and a samarium content of 1 wt% was obtained, which was recorded as 20Ni5Sm / MCM-41.

[0060] Comparative Example 1

[0061] Preparation of comparative catalysts

[0062] In this comparative example, a catalyst was prepared according to the same method as in Example 2, except that the addition of samarium nitrate hexahydrate was omitted and the amount of nickel nitrate hexahydrate was adjusted to 0.5504 g. Finally, an MCM-41 molecular sieve-supported nickel catalyst with a nickel content of 10 wt% was obtained, which was recorded as 10Ni / MCM-41.

[0063] Comparative Example 2

[0064] Preparation of comparative catalysts

[0065] In this comparative example, a catalyst was prepared according to the same method as in Example 3, except that the addition of nickel nitrate hexahydrate was omitted and the amount of samarium nitrate hexahydrate was adjusted to 0.7389 g. Finally, an MCM-41 molecular sieve-supported samarium catalyst with a samarium content of 20 wt% was obtained, which was recorded as 20Sm / MCM-41.

[0066] Comparative Example 3

[0067] Preparation of comparative catalysts

[0068] In this comparative example, the catalyst was prepared according to the same method as in Example 2, except that samarium nitrate hexahydrate was replaced with zirconium nitrate pentahydrate, and the amount of zirconium nitrate pentahydrate was 0.0471 g. Finally, a nickel-samarium bimetallic synergistic / MCM-41 molecular sieve catalyst with a nickel content of 10 wt% and a zirconium content of 1 wt% was obtained, which was recorded as 10Ni1Zr / MCM-41.

[0069] Comparative Example 4

[0070] Preparation of comparative catalysts

[0071] In this comparative example, a catalyst was prepared according to the same method as in Example 2, except that the carrier was replaced with an equal amount of SBA-15 molecular sieve, and a nickel-samarium bimetallic synergistic / SBA-15 molecular sieve catalyst with a nickel content of 10 wt% and a samarium content of 1 wt% was finally obtained, which was recorded as 10Ni1Sm / SBA-15.

[0072] Experimental Example 1

[0073] Determination of the physicochemical properties of Ni-Samarium bimetallic synergistic / MCM-41 molecular sieve catalyst

[0074] The structure of the catalysts prepared by the MCM-41 molecular sieve carrier and the examples and comparative examples was analyzed. Figures 1 to 5 shown.

[0075] See also Figure 1 , XRD spectrum of metal-supported MCM-41 molecular sieve catalyst Figure 2Two sharp peaks corresponding to (111) and (200) of NiO phase were detected at θ=37.3° and 43.2°, which are sharper than the XRD peaks without adding metallic samarium, proving that the addition of samarium can make the dispersion of metallic nickel more uniform when using MCM-41 molecular sieve as the carrier.

[0076] See also Figure 2 According to the IUPAC classification, the Ni-Sm bimetallic / MCM-41 zeolite exhibits a IV isotherm, accompanied by an H3-type hysteresis loop, compared to MCM-41 zeolite. This indicates that the prepared Ni-Sm bimetallic / MCM-41 zeolite catalyst expands its internal pores after high-temperature calcination, forming a distinct mesoporous structure that facilitates the entry of loaded metals.

[0077] See also Figure 3 , the MCM-41 molecular sieve is concentrated at 2.5nm, while the pore size distribution at 0.5nm and 5.8nm after metal loading and calcination further proves the existence of this microporous-mesoporous composite pore structure, which is beneficial to promote the dispersion of active metals on the surface of the carrier and promote reaction mass transfer.

[0078] See also Figure 4 From the TEM image, it can be observed that the active metals are dispersed on the surface of the MCM-41 molecular sieve carrier. After the addition of samarium, the particle size is smaller and the dispersion is more uniform, which is conducive to exposing more active centers and promoting the adsorption and activation of methane molecules during the catalytic methane dry reforming reaction to produce synthesis gas.

[0079] See also Figure 5 The EPR pattern shows that the EPR signal at g = 2.003 corresponds to the presence of oxygen vacancies. The signal intensity of the catalyst with samarium addition is significantly greater than that of the nickel / MCM-41 molecular sieve catalyst, confirming that the synergistic effect of the nickel-samarium bimetallic catalyst promotes the formation of a large number of oxygen vacancies. This facilitates the adsorption and activation of CO2 during the reaction, forming active O* intermediates and thus promoting the removal of carbon deposits.

[0080] Experimental Example 2

[0081] Performance test of catalytic methane dry reforming to synthesis gas over nickel-samarium bimetallic synergistic / MCM-41 molecular sieve catalyst

[0082] Test method: 0.05-0.4g of catalyst was ground with inert silicon carbide solid phase at a mass ratio of 1:4 for 10 minutes, then placed in a vertical micro fixed bed reactor. After reduction treatment at 550-750℃ for 4 hours in a 100mL / min 10vol% H2 / N2 flow, the catalytic reaction was carried out. The molar ratio of methane to carbon dioxide in the feed was 1, and the gas feed space velocity was 40,000-120,000mL·h -1 ·g cat-1 , the reaction temperature is 650-850° C. Specific reaction conditions and results are shown in Tables 1 and 2.

[0083] Table 1

[0084]

[0085]

[0086] Table 2

[0087]

[0088] Table 1 shows the catalytic effect of each catalyst at 5 h under the corresponding reaction conditions, and Table 2 shows the deactivation inflection point time of each catalyst and the catalytic effect at that time. It can be concluded that the catalyst of the present invention can still exhibit a high methane / carbon dioxide conversion rate in the catalytic CH4-CO2 reforming reaction to produce synthesis gas after 700 h. The conversion rate of the catalyst with the synergistic effect of the nickel-samarium bimetallic catalyst exceeds 80%, and the H2 / CO ratio in the synthesis gas is 0.8-1.2, indicating that the catalyst has good stability and a long service life. Among them, 10Ni1Sm / MCM-41 has the best catalytic performance, and its deactivation time exceeds 1000 h, showing ultra-long durability.

[0089] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A nickel-samarium bimetallic synergistic / MCM-41 molecular sieve catalyst, characterized in that: The invention comprises a carrier and an active component loaded on the carrier, wherein the carrier is MCM-41 molecular sieve, the active components are nickel and samarium, the nickel content is 5-20wt%, the samarium content is 1-20wt%, and the balance is MCM-41 molecular sieve.

2. The method for preparing the nickel-samarium bimetallic synergistic / MCM-41 molecular sieve catalyst according to claim 1, wherein: The following steps are involved: (1) Dissolving nickel and samarium precursor salts in deionized water, adding ammonia water to obtain an alkaline nickel-samarium ammonia complex solution, adding MCM-41 molecular sieves to the alkaline nickel-samarium ammonia complex solution, and then heating and stirring the solution under closed conditions, and then heating and evaporating the solution until the pH value reaches neutral, thereby obtaining a reaction mixture; (2) The reaction mixture is centrifuged, the obtained solid is dried, ground into powder, and finally calcined in an air atmosphere to obtain the nickel-samarium bimetallic synergistic / MCM-41 molecular sieve catalyst.

3. The method for preparing the nickel-samarium bimetallic synergistic / MCM-41 molecular sieve catalyst according to claim 2, characterized in that: In step (1), the amount of ammonia added is such that the pH value reaches 10 to 12, and the stirring treatment condition is room temperature for 8 to 12 hours.

4. The method for preparing the nickel-samarium bimetallic synergistic / MCM-41 molecular sieve catalyst according to claim 2, wherein: In step (1), the heating and evaporation temperature is 60 to 90°C.

5. The method for preparing the nickel-samarium bimetallic synergistic / MCM-41 molecular sieve catalyst according to claim 2, characterized in that: In step (2), the drying conditions are a temperature of 80 to 110° C. and a time of 8 to 12 hours.

6. The method for preparing the nickel-samarium bimetallic synergistic / MCM-41 molecular sieve catalyst according to claim 2, characterized in that: In step (2), the specific process of the calcination treatment is: heating the temperature to 550-700°C at a heating rate of 1-5°C / min, and then calcining at this temperature for 2-6 hours.

7. Use of the nickel-samarium bimetallic synergistic / MCM-41 molecular sieve catalyst as claimed in claim 1 in catalytic methane dry reforming to produce synthesis gas.

8. A method for producing synthesis gas by catalytic dry reforming of methane, characterized in that: The following steps are involved: The catalyst as claimed in claim 1 is reduced in a 10 vol% H2 / N2 atmosphere at a temperature of 550-750°C for 2-4 hours, then mixed with inert silicon carbide, and catalyzed in a reactor for dry reforming of methane to produce synthesis gas.

9. The method for producing synthesis gas by catalytic dry reforming of methane according to claim 8, characterized in that: The catalyst and inert silicon carbide are mixed in a mass ratio of 1:2-5 by solid phase grinding for 10-15 minutes. The reaction conditions are: the molar ratio of CH4 to CO2 in the reaction feed is 1-2, and the gas feed space velocity is 40,000-120,000 mL·h -1 ·gcat -1 , the catalyst dosage is 0.05~0.5g, and the reaction temperature is 550~850℃.

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