Mullite-supported PD catalyst for purifying industrial organic waste gas and preparation method thereof
A technology of organic waste gas and mullite, which is applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, catalyst carriers, etc., can solve the problems of catalyst preparation troubles, and achieve improved catalytic performance, anti-sintering ability, and large heat capacity. Effect
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Embodiment 1
[0013] (1) The first coating: weigh Ce 2 (CO 3 ) 3 80g (with CeO 2 60g), silica sol binder 1200g (containing SiO 2 240g), add 5L of deionized water to dilute and ball mill for 4 hours. The mullite honeycomb ceramic carrier (50 mesh / in 2 , appearance 100mm×100mm×100mm) impregnate the above slurry, and blow out the excess slurry in the pores of the mullite honeycomb ceramic carrier with high-pressure gas. It was then dried at 110°C and calcined at 400°C for 4 hours. The application amount of the first coat was 6 g / L.
[0014] (2) Second coating: weigh Ce 2 (CO 3 ) 3 100g (with CeO 2 75g), La 2 (CO 3 ) 3 105g (including La 2 o 3 75g), pseudo-boehmite binder 2000g (containing Al 2 o 3 600g), CeO 2 , La 2 o 3 and Al 2 o 3 The mass ratio is 10:10:80. Add 5L of deionized water to dilute and ball mill for 4 hours, then add concentrated nitric acid to adjust the acidity to pH=3.5. The mullite honeycomb ceramic coated with the first coating layer is impregnated w...
Embodiment 2
[0020] The first coating and the second coating of the catalyst are the same as in Example 1, except that the loading capacity of the third coating Pd is 0.2g per liter, that is, the H containing Pd6g is weighed. 2 PdCl 4 solution, add deionized water to make a 60L solution, and adjust the acidity to pH=4.5 with concentrated nitric acid. The mullite honeycomb ceramic carrier coated with the above two coatings was impregnated in it to make H 2 PdCl4 Adsorbed on the surface of the carrier, the mullite honeycomb ceramic containing noble metal Pd is separated from the aqueous solution, dried at 110°C, and calcined at 500°C for 4 hours to obtain the mullite honeycomb ceramic supported Pd catalyst of the present invention. The total amount of noble metal Pd in the third coating was 0.2 g / L. The catalyst activity evaluation results are shown in Table 2. Catalyst evaluation conditions were the same as in Example 1.
[0021] Table 2: Performance of Example 2Pd catalyst
[0022] ...
Embodiment 3
[0024] The first coating and the second coating of the catalyst are the same as in Example 1, except that the loading capacity of the third coating Pd is 0.4g per liter, that is, the H containing Pd12g is weighed. 2 PdCl 4 solution, add deionized water to make a 60L solution, and adjust the acidity to pH=4.5 with concentrated nitric acid. The mullite honeycomb ceramic carrier coated with the above two coatings was impregnated in it to make H 2 PdCl 4 Adsorbed on the surface of the carrier, the mullite honeycomb ceramic containing noble metal Pd is separated from the aqueous solution, dried at 110°C, and calcined at 500°C for 4 hours to obtain the mullite honeycomb ceramic supported Pd catalyst of the present invention. The total amount of noble metal Pd in the third coating was 0.4 g / L. The catalyst activity evaluation results are shown in Table 3. Catalyst evaluation conditions were the same as in Example 1.
[0025] Table 3: Performance of Example 3Pd catalyst
[002...
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