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Broad-spectrum VOCs (Volatile Organic Compounds) catalytic combustion monolithic catalyst as well as preparation method and application thereof

A monolithic catalyst and catalytic combustion technology, applied in the direction of catalyst activation/preparation, combustion method, physical/chemical process catalyst, etc., can solve the problems of environmental secondary pollution, resource and energy waste, etc., and achieve improved utilization rate and flow resistance Effects of Low and Intensifying Interactions

Active Publication Date: 2018-07-27
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The direct combustion method is only suitable for high-concentration combustible exhaust gas. This method will cause a huge waste of resources and energy, and at the same time produce by-products such as dioxins and NOx, as well as black smoke, noise and odor from incomplete combustion, causing secondary pollution to the environment. secondary pollution

Method used

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  • Broad-spectrum VOCs (Volatile Organic Compounds) catalytic combustion monolithic catalyst as well as preparation method and application thereof
  • Broad-spectrum VOCs (Volatile Organic Compounds) catalytic combustion monolithic catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Weigh Ce-Zr-La-Y quaternary rare earth composite oxide 150g, high specific surface area (>200m 2 / g) Activated alumina 340g, 10g pseudoboehmite, water 500g and mix and stir, add nitric acid to adjust slurry pH=3, put it into a sand mill and wet grind for 0.5h to make 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 semi-finished monolithic catalyst and immerse it in the dilute...

Embodiment 2

[0027] Weigh Ce-Zr-La-Y quaternary rare earth composite oxide 160g, high specific surface area (>200m 2 / g) Activated alumina 230g, 10g boehmite, 600g water and mix and stir, add nitric acid to adjust slurry pH=4, put it into a sand mill and wet grind for 0.5h to make coating slurry. Among them, the CeO in the quaternary rare earth composite oxide 2 , ZrO 2 , La2 o 3 , Y 2 o 3 The 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 product and immerse it in the diluted p...

Embodiment 3

[0029] Weigh Ce-Zr-La-Pr quaternary rare earth composite oxide 150g, high specific surface area (>200m 2 / g) Activated alumina 130g, 20g pseudo-boehmite, 700g water and mix and stir, add nitric acid to adjust slurry pH=3.5, put it into sand mill and wet grind for 0.5h to make 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 of the above-mentioned monolithic catalyst semi-finished ...

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Abstract

The invention provides a broad-spectrum VOCs (Volatile Organic Compounds) catalytic combustion monolithic catalyst and belongs to the technical field of catalysts. The catalyst comprises monolithic cordierite honeycomb ceramic, an auxiliary agent coating and an active coating; the auxiliary agent coating is prepared from one of active aluminum oxide, lanthanum modified active aluminum oxide or cerium modified active aluminum oxide, a rare-earth oxide compound and a binding agent; the active coating comprises one or two of noble metal palladium or noble metal platinum. The invention further provides a preparation method and application of the catalyst. The broad-spectrum VOCs catalytic combustion monolithic catalyst provided by the invention has low ignition temperature and high conversionefficiency on methane, propane and common volatile organic compounds, such as benzene, toluene, xylol, acetone, methanol, ethanol, acetic acid and ethyl acetate; the broad-spectrum VOCs catalytic combustion monolithic catalyst has common applicability. The catalyst has low gas flow resistance, low concentration of the volatile organic compounds and a wide air speed application range.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a broad-spectrum VOCs catalytic combustion monolithic catalyst and a preparation method and application thereof. Background technique [0002] Volatile organic compounds (VOCs), as important precursors of ozone and PM2.5, are one of the main contributors to the current regional complex air pollution in my country. [0003] At present, the VOCs treatment technologies commonly adopted in the industry are divided into recovery and destruction technologies. Among them, recovery technology mainly includes adsorption technology, absorption technology, condensation (and vapor balance) technology and membrane separation technology. Destruction technologies such as photocatalysis, low temperature plasma, biodegradation, direct combustion and catalytic combustion, etc. Photocatalysis, low-temperature plasma, biodegradation and other methods are mainly used for the treatment...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63B01J35/04B01J37/02B01J37/08F23G7/07
CPCF23G7/07B01J23/002B01J23/63B01J37/0201B01J37/0215B01J37/08B01J37/088B01J2523/00B01J35/56B01J2523/31B01J2523/3706B01J2523/3712B01J2523/3787B01J2523/48B01J2523/3718B01J2523/3725B01J2523/41
Inventor 欧阳李科乔莎陈耀壮王磊李洁赵英雷菊梅
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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