Precious metal methanol-to-hydrogen catalyst as well as preparation method and application thereof

Abstract

The invention discloses a noble metal methanol-to-hydrogen catalyst as well as a preparation method and application thereof. The noble metal methanol-to-hydrogen catalyst comprises a carrier, an active component and an auxiliary agent, the carrier is hydrotalcite LDH or roasted hydrotalcite LDO after roasting, the active component is noble metal, and the loading amount of the noble metal is 0.05%-2% based on the mass percentage; the loading capacity of the auxiliary agent is 0.5%-10%; and the particle size of the carrier is 5-500 nm. According to the invention, the ultrathin lamellar hydrotalcite is used as the carrier to support the noble metal to realize atomic-scale high dispersion, the interaction of electron transfer and the like between the active metal and the carrier is regulated and controlled by adding the assistant, the dissociation sites of water are increased, the atomic-scale dispersion immobilization of the active component noble metal is realized, the high-temperature methanol hydrogen production performance is good, and the CO selectivity is low.

Description

technical field [0001] The invention belongs to the technical field of catalysts, in particular to the technical field of methanol hydrogen production catalysts, and more particularly relates to a precious metal methanol hydrogen production catalyst and a preparation method and application thereof. Background technique [0002] Methanol, as an organic liquid-phase hydrogen carrier, can realize on-line in-situ hydrogen production. The reaction temperature of methanol steam reforming (MSR) is mild and the hydrogen yield is high, which is the preferred route for hydrogen production. Catalysts are the key to hydrogen production from methanol reforming. Precious metals such as Pt, Pd, Ru, etc., can be used as active metals to crack methanol, and have excellent catalytic performance, which has been the focus of research. At present, the commonly used supports are metal oxides, such as Al 2 O 3 , CeO 2 , ZnO and SiO 2 It has a large specific surface area and stability, can for...

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Problems solved by technology

[0004] Patent CN106799228A discloses a catalyst for reforming methanol to produce hydrogen, which uses CeO 2 One or a mixture of oxides of Fe, La, Zr, Mg and Al as a carrier, loaded with 8% of Pt and 15% of In 2 o 3 As a catalyst, the catalyst has a higher conversion rate and lower CO selectivity in the high-temperature methanol hydrogen production reaction, but the catalyst preparation process will produce pungent odor, the Pt loading is high, and the catalyst stability needs to be improved

[0005] In "Hydrogen production over highly active Pt based catalyst coatings by steam reforming of methanol: Effect of support and co-support" International Journal of Hydrogen Energy 2020, 1658-1670, using 15% Pt / 15% In 2 o 3 / CeO 2 Catalyst, high stability, but high Pt loading, low dispersion

[0006] Based on the above, it can be seen that the problems of noble metal methanol hydrogen production catalysts in the prior art are high noble metal loading, low dispersion, lack of water dissociation sites, resulting in higher reaction temperature, and high CO concentration in the hydrogen-rich product gas.

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