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Precious metal low-load catalyst for VOCs (volatile organic chemicals) catalytic combustion and preparation method

A catalyst and precious metal technology, which is applied in the field of catalysts with low loading of precious metals and their preparation, can solve problems such as restricting the use of catalysts, achieve good catalytic combustion performance, reduce usage, and have significant technical effects and economic benefits.

Inactive Publication Date: 2018-04-17
JIANGSU ANQIER WASTE GAS PURIFICATION +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the catalysts used for the catalytic combustion of VOCs currently on the market, the content of precious metals is generally 350-500g / m 3 Above, the amount of noble metal in the catalytic combustion catalyst is directly related to the cost of the catalyst, thus restricting the use of the catalyst

Method used

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  • Precious metal low-load catalyst for VOCs (volatile organic chemicals) catalytic combustion and preparation method
  • Precious metal low-load catalyst for VOCs (volatile organic chemicals) catalytic combustion and preparation method
  • Precious metal low-load catalyst for VOCs (volatile organic chemicals) catalytic combustion and preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1 (dipping method)

[0021] Solution preparation: Weigh 3.3292g of palladium chloride to prepare a 100mL solution; weigh CuCl 2 2H 2 O 26.63g, was prepared into 100mL solution; weighed lithium chloride 12.21g, was prepared into 100mL solution.

[0022] Weigh 30.03 g of spherical alumina carrier (alumina bulk density 0.75 g / mL) and place it in a dipping bottle.

[0023] Add 0.40mL Pd solution, 2.00mL Cu solution, 0.75mL Li solution and 6.85mL purified water into the mixer and mix well.

[0024] Add the mixed impregnation solution into the impregnation bottle to impregnate the carrier for 1 hour; transfer the impregnated catalyst to an oven at 120°C for 4 hours; transfer the dried catalyst to a muffle furnace for calcination at 450°C for 5 hours to prepare catalyst C-01 (Pd: 200g / m 3 ; Cu: 5000g / m 3 ; Li: 375g / m 3 ).

Embodiment 2

[0025] Embodiment 2 (active component coating method)

[0026] Solution preparation: take by weighing palladium chloride 3.3298g, be mixed with 100mL solution; Measure mass concentration and be 50% Mn(NO 3 ) 2 Solution (1.54g / ml) 42.25mL, diluted to 100mL; weigh Mg(NO 3 ) 2 ·6H 2 O 21.36g, prepared into 100mL solution.

[0027] Weigh 27.98g of cordierite honeycomb ceramics (bulk density 0.70g / mL), soak in dilute acid, dry and roast, and set aside. Coating the alumina sol slurry on the surface of the carrier to be used, and obtaining the cordierite honeycomb ceramics loaded with alumina coating after firing, controlling the concentration and coating amount of the alumina sol slurry so that the alumina coating accounts for 10 wt% of the carrier weight, ready for use.

[0028] Add 0.20mL of Pd solution, 1.20mL of Mn solution, 2.00mL of Mg solution and 6.60mL of purified water into a mixer and mix evenly to obtain a coating solution.

[0029] Coat the coating solution on the...

Embodiment 3

[0030] Embodiment 3 (active component coating method)

[0031] Solution preparation: Weigh 5.3097g of chloroplatinic acid to make 100mL solution; weigh Ce(NO 3 ) 3 ·6H 2 O 31.00g, prepared into 100mL solution; Weigh 5.0895g of sodium chloride, prepared into 100mL solution.

[0032] Weigh 28.03g of cordierite honeycomb ceramics, dry and roast after dilute acid treatment, and set aside. Coating the alumina sol slurry on the surface of the carrier to be used, and obtaining the cordierite honeycomb ceramics loaded with alumina coating after firing, controlling the concentration and coating amount of the alumina sol slurry so that the alumina coating accounts for 10 wt% of the carrier weight, ready for use.

[0033] Add 0.20mL of Pt solution, 0.60mL of Ce solution, 0.30mL of Na solution and 8.90mL of purified water into a mixer and mix evenly to obtain a coating solution.

[0034] Coat the coating solution on the alumina coating of the carrier and let it stand for 6 hours; tran...

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Abstract

The invention relates to the field of chemical industry and environmental protection, and aims to provide a precious metal low-load catalyst for VOCs (volatile organic chemicals) catalytic combustionand a preparation method. According to the catalyst, spherical aluminum oxide or a cordierite honeycomb ceramic serves as a carrier, 50-250g / m<3> of precious metals are loaded on the carrier to serveas main catalysts, 200-5000g / m<3> of transition metals or rare-earth elements serve as co-catalysts, 150-1000g / m<3> of alkaline metals or alkaline-earth metals serve as modifiers, and the precious metals include one or more of Pd, Pt, Rh or Ru. The transition metals, rare-earth metals and the alkaline metals or alkaline-earth metals are added and cooperate with the precious metals to jointly catalyze VOCs to degrade, the catalytic performance of the catalyst is improved, and the catalyst still has a good catalytic combustion performance even if the load of the precious metals is reduced. The catalyst is used for VOCs catalytic combustion and has the advantages of low VOCs treatment initiation temperature and high removal rate. Compared with a common commercial precious metal catalyst, theusage amount of the precious metals can be reduced by 25%, and the catalyst has quite remarkable advantages and economic benefits.

Description

technical field [0001] The invention belongs to the fields of chemical industry and environmental protection, and in particular relates to a catalyst with low loading of precious metals used for catalytic combustion of VOCs and a preparation method. Background technique [0002] Volatile organic compounds (VOCs) are common industrial pollutants, mainly produced in petrochemical industry, printing and dyeing, printing, paint, paper and paint processing industries. Most of VOCs have a certain degree of environmental toxicity, poisonous, odorous, and some even have carcinogenic effects. Under sunlight, VOCs can trigger photochemical reactions, generate photochemical smog, cause serious pollution to the atmospheric environment, and endanger human health. Therefore, it is necessary to adopt corresponding control measures to reduce or eliminate the harm of exhaust gas to the environment. [0003] Catalytic combustion technology is a simple and practical VOCs purification technolo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01J23/656B01J23/63B01J23/62F23G7/07
CPCB01J23/002B01J23/626B01J23/63B01J23/6562B01J23/8946B01J2523/00F23G7/07F23G2209/14B01J2523/31B01J2523/824B01J2523/17B01J2523/11B01J2523/22B01J2523/41B01J2523/72B01J2523/828B01J2523/3712B01J2523/12B01J2523/13B01J2523/842B01J2523/25B01J2523/43
Inventor 赵伟荣毕文君
Owner JIANGSU ANQIER WASTE GAS PURIFICATION
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