A kind of broad-spectrum vocs catalytic combustion monolithic catalyst and its preparation method and application
A monolithic catalyst and catalytic combustion technology, applied in catalyst activation/preparation, combustion methods, physical/chemical process catalysts, etc., can solve problems such as resource and energy waste, environmental secondary pollution, etc., achieve low flow resistance and improve utilization efficiency, and the effect of ensuring stability
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Embodiment 1
[0025] Weigh Ce-Zr-La-Y quaternary rare earth composite oxide 150g, high specific surface area (>200m 2 / g) 340 g of activated alumina, 10 g of pseudoboehmite, and 500 g of water were mixed and stirred, nitric acid was added to adjust the pH of the slurry to 3, and the slurry was wet-milled in a sand mill for 0.5 h to prepare a coating slurry. Among them, the CeO in the quaternary rare earth composite oxide 2 , ZrO 2 , La 2 o 3 , Y 2 o 3 The mass contents are 80%, 10%, 2%, 8%, respectively. Put 300 holes / square inch of cordierite honeycomb ceramics into the prepared slurry until completely submerged, take out the honeycomb ceramics, use compressed air to blow off excess slurry inside the channels, then dry at 110°C for 2 hours, and calcined at 500°C for 8 hours A monolithic catalyst semi-finished product is obtained, wherein the additive coating content is 14.6%. Measure 2 mL of 5 mgPd / mL palladium nitrate aqueous solution, dilute it to 70 mL, weigh 100 g of the above-m...
Embodiment 2
[0027] Weigh Ce-Zr-La-Y quaternary rare earth composite oxide 160g, high specific surface area (>200m 2 / g) 230 g of activated alumina, 10 g of boehmite, and 600 g of water were mixed and stirred, nitric acid was added to adjust the pH of the slurry to 4, and then placed in a sand mill for 0.5 h to make a coating slurry. Among them, the CeO in the quaternary rare earth composite oxide 2 , ZrO 2 , La 2 o 3 , Y 2 o 3The mass content is respectively 30%, 55%, 5%, 10%. Put 200 holes / square inch of cordierite honeycomb ceramics into the prepared slurry until fully submerged, take out the honeycomb ceramics, use compressed air to blow off excess slurry inside the channels, then dry at 110°C for 2 hours, and calcined at 500°C for 2 hours A monolithic catalyst semi-finished product was obtained, wherein the additive coating content was 11.2%. Measure 6mL of 5mgPd / mL palladium nitrate aqueous solution, dilute it to 70mL, weigh 100g of the above monolithic catalyst semi-finished ...
Embodiment 3
[0029] Weigh Ce-Zr-La-Pr quaternary rare earth composite oxide 150g, high specific surface area (>200m 2 / g) 130 g of activated alumina, 20 g of pseudoboehmite, and 700 g of water were mixed and stirred, nitric acid was added to adjust the pH of the slurry to 3.5, and then placed in a sand mill for wet grinding for 0.5 h to prepare a coating slurry. Among them, the CeO in the quaternary rare earth composite oxide 2 , ZrO 2 , La 2 o 3 、Pr 6 o 11 The mass content is 10%, 80%, 6%, 4% respectively. Put the cordierite honeycomb ceramics with 400 holes / square inch into the prepared slurry until completely submerged, take out the honeycomb ceramics, use compressed air to blow off the excess slurry inside the channels, then dry at 110°C for 2 hours, and calcined at 600°C for 2 hours A monolithic catalyst semi-finished product was prepared, wherein the additive coating content was 7.5%. Measure 8 mL of 5 mgPd / mL palladium nitrate aqueous solution, dilute it to 70 mL, weigh 100 g...
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