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VOCs catalytic oxidation catalyst and preparation method and application thereof

A catalytic oxidation and catalyst technology, applied in the field of VOCs treatment, can solve the problem that the oxidation mechanism is not very clear.

Active Publication Date: 2021-05-28
安徽省博广运环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is still a certain gap between these composite metal oxide catalysts and the supported noble metal catalysts currently on the market, and their oxidation mechanism is not very clear, and there is still a long way to go before realizing industrial applications.

Method used

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  • VOCs catalytic oxidation catalyst and preparation method and application thereof
  • VOCs catalytic oxidation catalyst and preparation method and application thereof
  • VOCs catalytic oxidation catalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1), commercially available ZSM-5 molecular sieves were placed in 0.5mol / L NaOH solution, stirred at 20°C for 5h;

[0043] (2), the slurry of step (1) is centrifuged, washed with deionized water, and the resulting solid is placed in 0.5mol / L NH 4 In Cl solution, stir at 20°C for 5h;

[0044] (3) The slurry in step (2) was centrifuged, washed with deionized water until neutral, and the obtained solid was dried at 90°C for 10 hours, and then calcined at 500°C for 5 hours to obtain a hydrogen-type multi-stage porous ZSM-5 molecular sieve.

[0045]The morphology of the obtained multi-porous ZSM-5 molecular sieve is shown in figure 1 SEM, shown by figure 1 It can be seen that there are many mesopores etched by alkali on the surface of ZSM-zeolite, and the size of mesopores is 2-20 nm.

[0046] The hydrogen-type hierarchical porous ZSM-5 molecular sieve obtained in this example has a specific surface area of ​​480 m 2 / g, pore volume 0.42 mL / g.

Embodiment 2

[0048] (1), place commercially available ZSM-5 molecular sieves in a 0.1 mol / L NaOH solution, and stir at 50°C for 2h;

[0049] (2), the slurry of step (1) is centrifuged, washed with deionized water, and the obtained solid is placed in the NH of 0.1mol / L 4 In the Cl solution, stir at 90°C for 2h;

[0050] (3) Centrifuging the slurry in step (2), washing with deionized water until neutral, drying the obtained solid at 150°C for 5h, and calcining at 650°C for 2h to obtain a hydrogen-type hierarchical porous ZSM-5 molecular sieve.

[0051] The morphology of the obtained multi-porous ZSM-5 molecular sieve is shown in figure 2 SEM, shown by figure 2 It can be seen that there are many mesopores etched by alkali on the surface of ZSM-zeolite, and the size of mesopores is 2-20 nm.

[0052] The hydrogen-type hierarchical porous ZSM-5 molecular sieve obtained in this example has a specific surface area of ​​400 m 2 / g, pore volume 0.30 mL / g.

Embodiment 3

[0055] (1), mix 2.89g manganese nitrate (II) tetrahydrate and 3.03g copper nitrate (II) trihydrate and dissolve in 48g deionized water to obtain solution A;

[0056] (2), adding the multi-stage porous ZSM-5 molecular sieve of 8g embodiment 1 gained in solution A, ultrasonic dispersion 10min, stirring 1h, obtain slurry B;

[0057] (3), the slurry B is evaporated to dryness with a rotary evaporator to obtain solid C;

[0058] (4), dissolve 0.05g cerium nitrate hexahydrate (III) and 0.05g neodymium nitrate hexahydrate (III) in 24g deionized water to obtain solution D;

[0059] (5), adding solid C into solution D, ultrasonically dispersing for 10min, stirring for 1h to obtain slurry E;

[0060] (6), the slurry E is evaporated to dryness with a rotary evaporator to obtain solid F;

[0061] (7), put solid F on the support placed in the reactor, put 2g deionized water at the bottom of the reactor, solid F does not directly contact with water, seal the reactor, and leave standstill ...

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Abstract

The invention discloses a VOCs catalytic oxidation catalyst and a preparation method and application thereof. According to the catalyst, a hierarchical pore ZSM-5 molecular sieve serves as a carrier, transition metals Cu and Mn serve as active components, one or more of Ce, Nd and Co serve as auxiliaries, and the active metals and the auxiliaries are loaded into pore channels of the hierarchical pore molecular sieve through a step-by-step impregnation method; and steam treatment is then conducted to obtain the high-dispersion transition metal composite oxide catalyst. The well-developed pore channel structure of the hierarchical pore ZSM-5 molecular sieve provides the highly-dispersed surface for the active metal and the auxiliary, and the acidic center on the surface of the ZSM-5-molecular sieve provides the synergistic effect for the catalytic oxidation of VOCs, such that the VOCs catalytic oxidation activity of the catalyst is significantly improved; the catalyst is simple to prepare, adopts cheap raw materials, is suitable for mass production and industrial application, and has better application value and prospect.

Description

technical field [0001] The invention belongs to the field of VOCs treatment and relates to a VOCs catalytic oxidation catalyst, in particular to a transition metal oxide catalyst loaded on a multi-stage pore zeolite molecular sieve and a preparation method and application thereof. Background technique [0002] Volatile Organic Compounds (Volatile Organic Compounds, or VOCs) are one of the main reasons for the formation of smog in the atmosphere and lead to photochemical smog and destruction of the ozone layer, which seriously endanger human life and health. Therefore, VOCs are the primary control in key areas of China in recent years one of the pollutants. [0003] The efficient treatment of VOCs is a hot spot in current environmental protection work. VOCs treatment methods include recovery technologies such as adsorption, absorption, condensation, and membrane separation methods, as well as destruction technologies such as catalytic combustion, direct combustion, biodegrad...

Claims

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Application Information

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IPC IPC(8): B01J29/48B01D53/86B01D53/44B01D53/72
CPCB01J29/48B01D53/8687B01D53/8668B01D2257/708B01J2229/186Y02A50/20
Inventor 方志勇徐峰胡佳庆胡志健
Owner 安徽省博广运环保科技有限公司
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