Monolithic catalyst with organic waste gas selective adsorption and catalytic oxidation functions as well as preparation method and application thereof

[0037] (1) All-silicon Beta molecular sieves were synthesized by the organic template-free seed crystal method. The crystallization time was 24 hours. Some products were washed with deionized water to neutrality and then dried by suction filtration (dry material A). Dry (wet material B).

[0038](2) Immerse the dry material A into a salt solution composed of ruthenium trichloride, palladium nitrate, platinum nitrate, and cerium nitrate by the impregnation method, after immersion for 1 hour, suction filter and dry, and roast at 300 ° C for 4 hours to obtain a molecular sieve catalyst. The masses of Ru, Pd, Pt and Ce (calculated as simple elements) are respectively 0.4%, 0.05%, 0.05% and 0.1% of the molecular sieve catalyst.

[0039] (3) Immerse the cordierite carrier in a 2wt% tetraethylammonium hydroxide solution for pretreatment for 2 hours, then take it out and dry it;

[0040] (4) The first coating: mix alkaline silica sol (pH=9~10) and trimethoxysilane to form a stable sol,

[0050] (1) The all-silicon Beta molecular sieve synthesized by the organic template-free seed crystal method has a crystallization time of 18 hours. Part of the product is washed to neutral with deionized water and dried by suction filtration (dry material A). After suction filtration, some products are No drying required (wet material B).

[0051] (2) Immerse the product dry material A into a salt solution composed of ruthenium trichloride, palladium nitrate, lanthanum nitrate, and manganese nitrate by immersion method, after immersion for 2 hours, suction filter and dry, and roast at 300 ° C for 3 hours to obtain a molecular sieve catalyst. The masses of Ru and Pd (calculated as simple elements) are respectively 0.15%, 0.10%, 0.5% and 0.5% of the molecular sieve catalyst.

[0052] (3) Immerse the cordierite carrier in a 3wt% tetraethylammonium hydroxide solution for pretreatment for 2 hours, then take it out and dry it;

[0053] (4) Mix alkaline silica sol (pH=9~10) and trimet

[0057] (1) The all-silicon Beta molecular sieve synthesized by the organic template-free seed crystal method has a crystallization time of 12 hours. Part of the product is washed to neutral with deionized water and then dried by suction filtration (dry material A). No drying required (wet material B).

[0058] (2) Immerse the product dry material A into a salt solution composed of ruthenium trichloride, platinum nitrate, cerium nitrate, and manganese nitrate by immersion method, after immersion for 2 hours, suction filter and dry, and roast at 300 ° C for 2 hours to obtain a molecular sieve catalyst. The masses of Ru, Pd, and Pt (calculated as simple elements) are respectively 0.05%, 0.05%, 1.5%, and 1.0% of the molecular sieve catalyst.

[0059] (3) Immerse the cordierite carrier in a 5wt% tetraethylammonium hydroxide solution for pretreatment for 3 hours, then take it out and dry it;

[0060] (4) Mix alkaline silica sol (pH=9~10) and trimethoxysilane to form a stable sol, then