Monolithic catalyst for catalytic combustion of methane and preparation method thereof
A monolithic catalyst, methane catalytic combustion technology, applied in physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve problems such as difficulty in applying methane catalytic combustion, and achieve a simple and easy preparation method and high catalyst activity. , good effect
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[0033] The preparation method of the monolithic catalyst for methane catalytic combustion of the present invention may comprise the following steps:
[0034] S1. Preparation of rare earth composite alumina loaded Pd and rare earth composite molecular sieve loaded Pt.
[0035] In this step S1, the preparation of rare earth composite alumina supported Pd includes the following steps:
[0036] Alumina is impregnated with an aqueous solution of soluble rare earth salts, dried at 100-120°C and calcined at 500-1000°C after impregnation to obtain rare earth composite alumina. Among them, the soluble rare earth salt is nitrate or acetate; the nitrate is one or more of lanthanum nitrate, cerium nitrate, praseodymium nitrate and praseodymium nitrate; the acetate is lanthanum acetate, cerium acetate, praseodymium acetate and praseodymium acetate one or more of. After high-temperature roasting, the soluble rare earth salt forms rare earth oxides, which correspond to one or more of lanth...
Embodiment 1
[0048] Preparation of Pd supported on rare earth composite alumina: Weigh a certain amount of lanthanum nitrate, add it to deionized water, and stir until it is completely dissolved to form an aqueous solution of lanthanum nitrate; 2 o 3 Immerse in an aqueous solution of lanthanum nitrate, stir, dry at 120°C for 3 hours, and roast at 550°C for 3 hours to obtain rare earth composite alumina; lanthanum nitrate forms lanthanum oxide, and its weight content is 5% of alumina. Weigh a certain amount of palladium nitrate solution, and use the equal volume impregnation method to impregnate the prepared rare earth composite alumina into the palladium nitrate solution, stir, dry at 120°C for 3 hours, and roast at 550°C for 3 hours to obtain the supported rare earth composite alumina Pd; the weight content of Pd in the rare earth composite alumina supported Pd is 1%.
[0049] Preparation of Pt-loaded rare earth composite molecular sieve: Weigh a certain amount of cerium nitrate, add i...
Embodiment 2
[0052] Prepare rare earth composite alumina-loaded Pd and rare earth composite molecular sieve loaded Pt according to Example 1; respectively weigh 80g rare earth composite alumina loaded Pd and 40g rare earth composite molecular sieve loaded Pt, and the rest of the steps are the same as in Example 1 to prepare monolithic catalysts. The coating loading in the monolithic catalyst was 120 g / L.
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