Monolithic catalyst as well as preparation method and application thereof
A monolithic catalyst, catalyst technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of low reserves, high cost, and poor low-temperature catalytic performance of non-precious metal catalysts
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[0038] The present invention also provides the preparation method of the monolithic catalyst described in the above technical solution, comprising the following steps:
[0039] (1) Preparation of perovskite catalyst powder by sol-gel method;
[0040](2) mixing the perovskite catalyst powder obtained in the step (1) with a binder, a dispersant and water and then ball milling to obtain a perovskite catalyst slurry;
[0041] (3) The perovskite catalyst slurry obtained in the step (2) is supported on cordierite and then calcined to obtain a monolithic catalyst.
[0042] The invention adopts the sol-gel method to prepare the perovskite catalyst powder.
[0043] In the present invention, the preparation method of the perovskite catalyst powder preferably includes:
[0044] 1) The nitrate of the A-site element and the nitrate of the B-site element are mixed with absolute ethanol and citric acid to carry out a complexation reaction to obtain a perovskite catalyst precursor;
[0045...
Embodiment 1
[0079] A monolithic catalyst, consisting of a cordierite honeycomb ceramic and a perovskite catalyst loaded on the surface of the cordierite honeycomb ceramic; the quality of the perovskite catalyst is 152 g / g of the volume of the cordierite honeycomb ceramic. L; the perovskite catalyst is ABO 3 type catalyst, and the expression is LaMnO 3 .
[0080] The preparation method of the monolithic catalyst is the following steps:
[0081] (1) Preparation of LaMnO by sol-gel method 3 Perovskite catalyst powder: 0.1 mol La (NO 3 ) 3 and 0.1mol Mn(NO 3 ) 2 Dissolve in 500 mL of absolute ethanol, then add 0.12 mol of citric acid, and after mixing evenly, place the solution in a 70°C water bath and continue stirring until the mixture becomes gel-like; the resulting gel is dried at 110°C For 4 h, a sponge-like loose and porous solid was formed; the dried solid was calcined, and the calcination process was to heat up to 750 °C at a heating rate of 5 °C / min for 4 h to obtain LaMnO 3 ...
Embodiment 2
[0085] A monolithic catalyst, consisting of a cordierite honeycomb ceramic and a perovskite catalyst loaded on the surface of the cordierite honeycomb ceramic; the quality of the perovskite catalyst is 125 g / g of the volume of the cordierite honeycomb ceramic. L; the perovskite catalyst is ABO 3 type catalyst, and the expression is La 0.6 Sr 0.4 MnO 3 .
[0086] The preparation method of the monolithic catalyst is the following steps:
[0087] (1) Preparation of La by sol-gel method 0.6 Sr 0.4 MnO 3 Perovskite catalyst powder: 0.06mol La (NO 3 ) 3 , 0.04mol Sr(NO 3 ) 2 and 0.1mol Mn(NO 3 ) 2 Dissolve in 500 mL of absolute ethanol, then add 0.15 mol of citric acid, and after mixing evenly, place the solution in a water bath at 80 °C and keep stirring until the mixture becomes gel-like; the resulting gel is dried at 110 °C For 4 h, a sponge-like loose and porous solid was formed; the dried solid was calcined, and the calcination process was to heat up to 780 °C at a...
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