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Preparation method of monolithic catalyst for degrading VOCS (Volatile Organic Compounds)

A monolithic catalyst and catalyst technology, which are applied in the field of heterogeneous photocatalysis, can solve the problems of easy cracking and falling off, uneven catalyst layer, and large amount of catalyst, and achieve the effects of low cost, low amount of catalyst and simple operation.

Active Publication Date: 2014-08-06
广州市首牵化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to this, CN101069849A prepares monolithic catalyst by leaching method, but a large amount of catalyst enters the inside of the channel, and the catalyst remaining on the outer surface of the monolithic carrier is very little. The reaction is not suitable; some people use the coating method to coat the catalyst on the surface of the carrier, and then dry and roast to make a monolithic catalyst, but the prepared catalyst layer is uneven, the amount of catalyst is large, and it is easy to crack and fall off.

Method used

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  • Preparation method of monolithic catalyst for degrading VOCS (Volatile Organic Compounds)
  • Preparation method of monolithic catalyst for degrading VOCS (Volatile Organic Compounds)
  • Preparation method of monolithic catalyst for degrading VOCS (Volatile Organic Compounds)

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Experimental program
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Effect test

Embodiment 1

[0033] Monolithic Catalyst Pd-TiO 2 / Preparation of HCMCs:

[0034] (1) Carrier pretreatment: Soak cordierite in deionized water for 0.5h, take it out, put it in 5% nitric acid solution, heat and boil for 0.5h, then wash it with deionized water several times, put it in an oven at 80°C Dry at constant temperature for 2 hours, and cool for later use.

[0035] (2) Preparation of semi-gelled Pd-TiO2 precursor: at room temperature, under the condition of stirring at 400-450r / min, slowly drop 5-15mL titanium tetrachloride solution to 3 times free at a rate of 1 drop / s Prepare liquid A in water ethanol; take a certain amount of palladium salt solution (doping amount nPd / nTiO 2 The molar ratios are 0.06%, 0.18%, 0.30%, 0.42%, 0.54% respectively), and the palladium salt solution is obtained by dissolving the palladium salt palladium chloride with nitric acid solution, and is slowly added dropwise at a rate of 2-3 drops / s Prepare solution B in a small amount of absolute ethanol, and...

Embodiment 2

[0039] With the preparation method of embodiment 1, prepare monolithic catalyst Pd-TiO 2 / HCMCs and unsupported granular catalyst Pd-TiO 2. The difference is that the titanium salt titanium tetrachloride is replaced by butyl titanate; the palladium salt palladium chloride is dissolved in hydrochloric acid solution, the doping amount of Pd is 0.18%, and cordierite is replaced by corundum sand.

Embodiment 3

[0041] With the preparation method of embodiment 1, prepare monolithic catalyst Pd-TiO 2 / HCMCs and unsupported granular catalyst Pd-TiO 2 . The difference is that the palladium salt palladium chloride is dissolved in hydrochloric acid solution, the doping amount of Pd is 0.30%, and the cordierite is replaced by silicon carbide.

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Abstract

The invention relates to a preparation method of a monolithic catalyst for degrading VOCS (Volatile Organic Compounds). The preparation method comprises the following steps of: when preparing a TiO2 photocatalyst by using a sol-gel method, modifying the TiO2 photocatalyst by using Pd; and furthermore loading the TiO2 photocatalyst on the outer surface of porous ceramic by using an ejection method so as to obtain the monolithic catalyst. Due to the doping of a few quantity of Pd, the activity of titanium dioxide photocatalytic degradation toluene is greatly improved; and by loading the TiO2 photocatalyst on the outer surface of the porous ceramic by using the ejection method, the activity of the catalyst is improved, and at the same time the use quantity of the catalyst is greatly reduced. The preparation method is simple to operate, less in catalyst quantity and low in cost. In the ultraviolet light and visible photocatalytic degradation reaction of the VOCs, the catalyst prepared by using the preparation method shows good catalytic performance.

Description

technical field [0001] The invention relates to a method for preparing a monolithic catalyst for degrading VOCs, belonging to the technical field of heterogeneous photocatalysis. Background technique [0002] Today, indoor air pollution has become an "invisible killer" that endangers human health, and it has also become a common concern of all countries in the world. The development of degradation products for indoor organic pollutants has broad application prospects. [0003] There are many ways to control indoor pollutants, among which, photocatalytic degradation has been widely valued because of its incomparable advantages over other methods. At present, the commonly used photocatalytic degradation catalysts are semiconductor materials, such as TiO 2 , CdS, WO 3 , Fe 2 o 3 , ZnO, ZnS, SnO 2 Wait. TiO 2 Due to its stable photochemical properties, low cost, non-toxicity, and strong oxidation ability, it has been widely used in photocatalytic reactions. But since in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/44B01D53/86B01D53/44
Inventor 方奕文王欣欣胡元曾鹏刘欣王东琳宋一兵孙长勇
Owner 广州市首牵化工有限公司