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Monolithic oxidation catalyst for VOCs and preparation method of oxidation catalyst

An oxidation catalyst, integrated technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the problem of affecting performance, large heat capacity, reducing catalyst performance, etc. problems, to achieve the effects of improving stability and durability, optimizing the preparation process, and excellent treatment effects

Pending Publication Date: 2018-09-28
QINGDAO HSJ ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ceramic fiber carrier needs to be soaked in acid solution, pretreated with high-temperature water vapor, and then loaded with coating and active components in two steps. The catalyst has high activity and stability for CO oxidation, but the process is complex and numerous.
In addition, the coating forms a well-developed pore structure after drying and calcination, which makes it difficult to control the loading of active components. The active components loaded with precious metals tend to aggregate, resulting in larger active particles, which in turn affects performance. Catalysts are prone to sintering and deactivation at high temperatures.
[0006] VOCs oxidation catalysts have disadvantages such as complex preparation process, numerous procedures, and utilization of active components. The existing catalysts mainly use cordierite honeycomb ceramics as the carrier, and the shape and structure are not easy to adjust the specific gravity of the catalyst according to the requirements. The heat capacity is large, the ignition is slow, and the specific surface area Low, reducing catalyst performance and increasing operating energy consumption

Method used

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  • Monolithic oxidation catalyst for VOCs and preparation method of oxidation catalyst
  • Monolithic oxidation catalyst for VOCs and preparation method of oxidation catalyst
  • Monolithic oxidation catalyst for VOCs and preparation method of oxidation catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Carrier: integral carrier of ceramic fiber substrate, inch

[0045] 0.45g Na 2 CO 3 Mix with 290mL of deionized water, add 2.4g of PEG and 24g of aluminum sol (20wt%), and stir to obtain a mixed solution. Add 86.8g active Al successively 2 o 3 , 24.8g cerium-zirconium oxygen storage material, 6.2g La 2 o 3 and 6.2g Y 2 o 3 , stirred well and with HNO 3 Adjust pH=3-4, add 4g Pd(NO 3 ) 2 Continue ball milling for 1 h to obtain coating slurry.

[0046] The slurry is coated on the carrier by a vacuum coating machine, coated for 2-3 minutes and vacuum purged, dried with hot air at 120° C. for 30 minutes, and calcined in an air atmosphere at 500° C. for 4 hours to obtain a monolithic VOCs oxidation catalyst. The coating amount of the coating layer on the catalyst was 123 g / L, and the loading amount of the noble metal was 0.61 g / L Pd.

Embodiment 2

[0048] Carrier: integral carrier of ceramic fiber substrate, inch

[0049] 0.39g Na 2 CO 3 Mix with 290mL of deionized water, add 1.8g of PEG and 18g of aluminum sol (20wt%), and stir to obtain a mixed solution.

[0050] Add 86.8g active Al successively 2 o 3 , 24.8g cerium-zirconium oxygen storage material, 6.2g La 2 o 3 and 6.2g Y 2 o 3 , stirred well and with HNO 3 Adjust pH=3-4, add 2.8g Pd(NO 3 ) 2 and 1.2g Pt(NO 3 ) 2 , continue ball milling for 1 h to obtain coating slurry.

[0051] The slurry is coated on the carrier by a vacuum coating machine, coated for 2-3 minutes and vacuum purged, dried with hot air at 120° C. for 30 minutes, and calcined in an air atmosphere at 500° C. for 4 hours to obtain a monolithic VOCs oxidation catalyst. The coating weight of the coating on the catalyst was 128 g / L, and the noble metal loadings were 0.44 g / L Pd and 0.18 g / L Pt.

Embodiment 3

[0053] Carrier: glass fiber substrate monolithic carrier, inch

[0054] 0.52g Na 2 CO 3 , 24.96g Mn(NO 3 ) 2 Mix with 290mL of deionized water, add 1.8g of PEG and 6g of pseudo-boehmite, and stir to obtain a mixed solution. Add 24.8g active Al successively 2 o 3 , 86.8g cerium-zirconium oxygen storage material, 6.2g La 2 o 3 and 6.2gY 2 o 3 , stirred well and with HNO 3 Regulate pH=3-4, add 2.8g Pd(NO 3 ) 2 and 1.2g Pt(NO 3 ) 2 , continue ball milling for 1 h to obtain coating slurry.

[0055] The slurry is coated on the carrier by a vacuum coating machine, coated for 2-3 minutes and vacuum purged, dried with hot air at 120° C. for 30 minutes, and calcined in an air atmosphere at 500° C. for 4 hours to obtain a monolithic VOCs oxidation catalyst. The coating amount of the coating on the catalyst is 134g / L, and MnO in the coating 2 The loading is 5wt%, and the noble metal loading is 0.47g / L Pd and 0.2g / L Pt.

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Abstract

The invention relates to a monolithic oxidation catalyst for volatile organic compounds (VOCs) and a preparation method of the oxidation catalyst. The monolithic oxidation catalyst for the VOCs comprises a carrier, a catalyst coating uniformly embedded into the carrier and uniformly distributed on the surface of the carrier, and an active component and an auxiliary agent which are uniformly dispersed in the catalyst coating, wherein the carrier is a monolithic corrugated fiber paper carrier formed by rolling or laminating a corrugated fiber paper substrate. The preparation method of the catalyst provided by the invention has a simple process, low costs and easy industrialized realization; and the monolithic oxidation catalyst for the VOCs prepared by the method has excellent catalytic activity, thermal stability and water resistance, a high geometric specific surface area and a low catalyst density which is 60%-70% of that of a conventional cordierite material, and can be quickly ignited, thereby facilitating a quick catalytic oxidation reaction.

Description

technical field [0001] The invention relates to an environmental catalytic material and a preparation method thereof, in particular to an integral VOCs oxidation catalyst and a preparation method thereof, and belongs to the technical field of air pollution control. Background technique [0002] Volatile Organic Pollutants (VOCs) and SO 2 , NOx, dust and motor vehicle exhaust are important pollutants in the atmospheric environment, causing serious harm to human health and causing acid rain, O 3 , PM2.5 and other main precursors of secondary pollutants. [0003] Catalytic-oxidation method is an effective means to eliminate VOCs emitted by industry. VOCs molecules are adsorbed on the surface of the catalyst and activated. 2 A rapid oxidation reaction occurs, and the product molecule CO 2 and H 2 O is desorbed from the surface of the catalyst, which has the characteristics of high efficiency, stability, and cleanliness. Compared with the ordinary thermal combustion method, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/656B01J23/63B01J23/89B01D53/86B01D53/72
CPCB01D53/8668B01J23/002B01J23/63B01J23/6562B01J23/8946B01J2523/00B01J2523/12B01J2523/31B01J2523/3712B01J2523/48B01J2523/3706B01J2523/36B01J2523/824B01J2523/828B01J2523/72B01J2523/17
Inventor 展宗城梁鹏展飞孟庆锐郅立鹏陈继朝
Owner QINGDAO HSJ ENVIRONMENTAL PROTECTION TECH CO LTD
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