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Monolithic catalyst for removing benzene series at low temperature, and preparation method thereof

A monolithic catalyst technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of oxidation by-products, escape, etc.

Inactive Publication Date: 2020-01-03
FUDAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

due to O 3 Oxidation than O 2 Strong, so use O 3 As an oxidizing agent, it has high catalytic activity at low temperature, but there are also O 3 Issues such as escape and generation of oxidation by-products

Method used

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  • Monolithic catalyst for removing benzene series at low temperature, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Lattice-doped Cu-MnO 2 Prepared by grinding. Add manganese chloride, potassium permanganate and copper sulfate with a molar ratio of 2:3:(0.07 to 0.3) into the grinder, add 0.5 times the solid volume of water, grind for 2 hours, filter, wash, and dry at 110°C for 12 hours. Lattice-doped Cu-doped MnO obtained by calcination at 500℃ for 6h 2 , respectively recorded as: 0.5% Cu-MnO 2 , 1% Cu-MnO 2 , 2% Cu-MnO 2 .

[0025] XRD and HRTEM analysis prove that copper ions enter MnO 2 lattice.

[0026] Catalyst performance tests were carried out in a continuous-flow fixed-bed reactor. Before the catalyst performance test, the catalyst was not treated in any way. The powdered catalyst was pressed into tablets and crushed to make a particle sample of 0.25-0.50 mm. Then, 0.5 g of the particle sample was placed in a glass tube. Under the condition that the humidity is 50%, the air containing 200ppm benzene is introduced, and the wind speed is 2.5m / s. The gas at the outlet o...

Embodiment 2

[0028] Potassium-doped MnO 2 Prepared by ion exchange method. In 1000 g 2% Cu-MnO 2Add 500mL of different concentrations of KCl solution (2.5~10mol / L), at 60 o C to dryness, and then calcined at 400 °C for 24 h to obtain lattice-doped copper and channel-doped potassium MnO 2 , recorded as: 0.5% K-2% Cu-MnO 2 , 1%K-2%Cu-MnO 2 , 2%K-2%Cu-MnO 2 .

[0029] XRD and HRTEM analysis prove that copper ions enter MnO 2 Lattice and K into MnO 2 Pores lead to micro-changes in the channels.

[0030] The catalytic activity test is the same as in Example 1. The results are shown in Table 1.

Embodiment 3

[0032] Doped MnO 2 Preparation of monolithic catalysts. Weigh 1000 g of 2%K-2%Cu-MnO 2 , add 500ml deionized water and 5-50% silica gel binder, stir at 400 rpm for 1-24h, and obtain doped α-MnO 2 slurry. The doped MnO was extracted by vacuum-negative pressure extraction technique 2 The slurry is coated on the pre-treated honeycomb ceramics, and fired at 500 °C for 12 hours to obtain doped MnO 2 Monolithic catalyst, denoted as: monolithic KCu-MnO 2 .

[0033] The performance test of the monolithic catalyst is carried out in the air purifier EN of Huanengtong Group TM Carried on. The three-dimensional of monolithic catalyst is 150*150*40mm 3 , Then pack into the air cleaner, under the condition of low temperature (100° C.) and relative humidity of 50%, feed the air containing 200 ppm benzene, and the wind speed is 2.5m / s. Agilent 7890A gas chromatograph was used to detect the concentration of the outlet gas. The results are shown in Table 1.

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Abstract

The invention belongs to the technical field of environmental protection, and particularly relates to a monolithic catalyst for removing benzene series at a low temperature, and a preparation method thereof. The monolithic catalyst is formed by firstly loading doped hollandite type MnO2, used as a first active component, on a honeycomb ceramic used as a carrier, and then loading silver-palladium used as a second active component. In the doped hollandite type MnO2, copper ions (Cu<2+>) replace a part of lattice sites of MnO2, and an alkali metal (K<+> or Na<+>) exists in pore channels with thesize of about 0.46 * 0.46 nm<2>; and a weight ratio of the Cu to the MnO2 is 0.5-10%, a weight ratio of the alkali metal to the MnO2 is 0.5-10%, a weight ratio of the silver-palladium alloy to the doped MnO2 is 1-10%, and a weight ratio of the silver to the silver-palladium alloy is 0-100%. The monolithic catalyst can be used for efficiently, stably and simultaneously removing various volatile organic pollutants at the low temperature.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to an integral catalyst for removing benzene series at low temperature. Background technique [0002] Volatile organic compounds (Volatile Organic Compounds, VOCs) are widely produced in petroleum refining, steel manufacturing, paint production, equipment coating, packaging and printing, refined oil storage and transportation, and fuel combustion. They are atmospheric fine particle pollutants (such as PM 2.5 ) is an important source of [1,2] . In recent years, the total amount of VOCs emissions in my country has gradually increased, and the problems of compound air pollution such as photochemical smog and urban haze have become increasingly serious. It is estimated that the total amount of VOCs emissions in 2020 will increase by about 50% compared to 2005 [3] . Among them, benzene series account for a large proportion of VOCs emissions, and have adve...

Claims

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Application Information

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IPC IPC(8): B01J23/89B01D53/86B01D53/72
CPCB01J23/8986B01D53/8668B01D2257/7027
Inventor 唐幸福陈雅欣陈俊逍
Owner FUDAN UNIV
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