# US 2023/0056669 A1 · Catalyst for preparing a synthesis gas, a method for preparing the same, and a method for preparing a synthesis gas using the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2023/0056669 A1 - Document ID: US20230056669A1 - Status: Published application - Kind: A1 - Application number: 17/712,212 - Filed: 2022-04-04 - Published: 2023-02-23 - Earliest claimed: 2021-08-06 - Assignees: Hyundai Motor Company; Kia Corporation; Research & Business Foundation Sungkyunkwan University - Applicants: Hyundai Motor Company; Kia Corporation; Research & Business Foundation SUNGKYUNKWAN UNIVERSITY - Inventors: Kyung Soo Park; Haeun Jeong; Jin Woo Choung; Ji Su Yu; Jae Min Park; Jong Wook Bae - Web page: https://patentgrep.com/patent/US20230056669A1 ## CPC - B01J 23/755: Nickel - B01J 21/04: Alumina - B01J 35/397: {Egg shell like} - B01J 35/45: Nanoparticles - B01J 35/643: {less than 2 nm} - B01J 35/647: {2-50 nm} - B01J 35/70: characterised by their crystalline properties, e.g. semi-crystalline (catalysts comprising carbon B01J21/18; molecular sieves B01J29/00) - B01J 35/77: Compounds characterised by their crystallite size - B01J 37/0209: {involving a reaction between the support and a fluid} - B01J 37/0225: {of metal substrates} - B01J 37/04: Mixing {(B01J37/0009, B01J37/0018 take precedence)} - B01J 37/08: Heat treatment {(B01J37/0009, B01J37/0018 take precedence)} - C01B 3/40: characterised by the catalyst - C01B 32/40: Carbon monoxide - B01J 35/30: characterised by their physical properties - B01J 2235/00: Indexing scheme associated with group B01J35/00, related to the analysis techniques used to determine the catalysts form or properties - B01J 2235/15: X-ray diffraction - B01J 2235/30: Scanning electron microscopy; Transmission electron microscopy - C01B 2203/0222: containing a non-catalytic carbon dioxide reforming step - C01B 2203/0233: the reforming step being a steam reforming step - C01B 2203/1047: Group VIII metal catalysts - C01B 2203/1082: Composition of support materials - C01B 2203/1241: Natural gas or methane - Y02P 20/52: using catalysts, e.g. selective catalysts - B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS - C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C} - Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS ## Abstract A catalyst for preparing a synthesis gas includes: a mesoporous Al2O3 support including mesopores having a pore size of about 1 nm to about 30 nm; metal nanoparticles supported in the mesopores of the mesoporous Al2O3 support wherein the metal nanoparticles have a particle size of less than or equal to about 20 nm; and a metal oxide coating layer including particles wherein the metal oxide coating layer is coated on the surface of the mesoporous Al2O3 support and includes mesopores having a pore size of about 2 nm to about 50 nm. ## Claims ### Claim 1 A catalyst for preparing a synthesis gas, the catalyst comprising: a mesoporous Al2O3 support including mesopores having a pore size of about 1 nm to about 30 nm, metal nanoparticles supported in the mesopores of the mesoporous Al2O3 support wherein the metal nanoparticles have a particle size of less than or equal to about 20 nm, and a metal oxide coating layer including particles wherein the metal oxide coating layer is coated on a surface of the mesoporous Al2O3 support and includes mesopores having a pore size of about 2 nm to about 50 nm. ### Claim 2 (depends on 1) The catalyst of claim 1, wherein the pore size of the mesoporous Al2O3 support is about 6 nm to about 20 nm. ### Claim 3 (depends on 1) The catalyst of claim 1, wherein the metal nanoparticles comprise Ni, Fe, Cu, Co, Mo, Ru, Rh, Pd, Ag, Cd, Zn, Au, Pt, Ir, Os, W, an oxide thereof, or a combination thereof. ### Claim 4 (depends on 1) The catalyst of claim 1, wherein the particle size of the metal nanoparticles is about 1 nm to about 6 nm. ### Claim 5 (depends on 1) The catalyst of claim 1, wherein the metal nanoparticles are included in an amount of about 5 wt % to about 30 wt % based on a total weight of the catalyst. ### Claim 6 (depends on 1) The catalyst of claim 1, wherein the metal oxide coating layer comprises SiO2, Al2O3, MgO, MgAl2O4, La2O3, CeO2, ZrO2, SiC, indium tin oxide (ITO), fluorine-doped tin oxide (FTO), or a combination thereof. ### Claim 7 (depends on 1) The catalyst of claim 1, wherein the metal nanoparticles are disposed in an amount of about 10 wt % to about 90 wt % based on a total weight of the metal nanoparticles in the mesopores of the mesoporous Al2O3 support. ### Claim 8 (depends on 1) The catalyst of claim 1, wherein the metal oxide coating layer is included in an amount of about 0.5 wt % to about 10 wt % based on a total weight of the catalyst. ### Claim 9 A method of preparing a catalyst for preparing a synthesis gas, the method comprising: preparing a mesoporous Al2O3 support including mesopores having a pore size of about 1 nm to about 30 nm; supporting metal nanoparticles having a particle size of less than or equal to about 20 nm in the mesopores of the mesoporous Al2O3 support; and forming a metal oxide coating layer including mesopores having a pore size of about 2 nm to about 50 nm on a surface of the mesoporous Al2O3 support. ### Claim 10 (depends on 9) The method of claim 9, wherein the supporting of the metal nanoparticles is performed by applying a metal nanoparticle precursor solution to the mesoporous Al2O3 support and then sintering the same at about 400° C. to about 1000° C. for about 1 hour to about 6 hours. ### Claim 11 (depends on 9) The method of claim 9, wherein the forming of the metal oxide coating layer is performed by attaching a nonionic, cationic, or anionic surfactant to the surface of the mesoporous Al2O3 support on which the metal nanoparticles are supported, applying the metal oxide precursor solution, and sintering the same at about 400° C. to about 1000° C. for about 1 hour to about 6 hours to form the metal oxide coating layer including mesopores having a pore size of about 2 nm to about 50 nm. ### Claim 12 (depends on 9) The method of claim 9, wherein the metal nanoparticles are disposed in an amount of about 10 wt % to about 90 wt % based on a total weight of the metal nanoparticles in the mesopores of the mesoporous Al2O3 support. ### Claim 13 (depends on 1) A method of preparing a synthesis gas, comprising performing a combined reforming reaction by injecting a reaction gas including water (H2O) in the presence of the catalyst for preparing a synthesis gas according to claim 1, and heat-treating the same to perform a combined reforming reaction. ### Claim 14 (depends on 13) The method of claim 13, wherein the reaction gas comprises water, and C1 to C20 alkane, C1 to C20 alkene, C1 to C20 alkyne, carbon dioxide, ammonia, HCO2H, CH3OH, or a combination thereof. ### Claim 15 (depends on 13) The method of claim 13, wherein the reaction gas comprises methane, carbon dioxide as an oxidizing agent, and the water, and the synthesis gas comprises hydrogen and carbon monoxide. ### Claim 16 (depends on 15) The method of claim 15, wherein the reaction gas comprises the methane and the oxidizing agent (carbon dioxide and water) in a mole ratio of about 1:1 to about 1:3. ### Claim 17 (depends on 15) The method of claim 15, wherein the oxidizing agents comprise the carbon dioxide and water in a mole ratio of about 0.2:1.5 to about 1.2:0.2. ### Claim 18 (depends on 13) The method of claim 13, wherein the combined reforming reaction is performed at a temperature of about 600° C. to about 1000° C. ### Claim 19 (depends on 13) The method of claim 13, wherein the reaction gas is supplied at a space velocity of about 30 L/gcat·h to about 1800 L/gcat·h.