Catalytic filtration composite element as well as preparation method and application thereof

A composite element, catalytic filtration technology, applied in chemical instruments and methods, separation methods, dispersed particle filtration, etc., can solve the problems of easy agglomeration and distribution of catalysts, unsatisfactory catalytic performance, high price, etc., and achieve a short preparation cycle and reduce production. Cost and operating pressure drop, effect of increasing reactivity

Active Publication Date: 2021-08-03
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this type of catalytic composite filter element has problems such as large pressure drop, unsatisfactory catalytic performance, short life and high price, which are mainly attributed to the low porosity (<40%) and high brittleness of the prepared filter element. Catalysts are easy to agglomerate and unevenly distributed

Method used

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  • Catalytic filtration composite element as well as preparation method and application thereof
  • Catalytic filtration composite element as well as preparation method and application thereof
  • Catalytic filtration composite element as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] This embodiment provides a catalytic filter composite element, the preparation method of which comprises:

[0057] 1. Based on the total mass of the slurry as 100%, 2% aluminum silicate fiber, 0.5% sodium carboxymethyl cellulose, and 97.5% (calculated by the mass of silica) silica sol were stirred in a high-speed disperser for 90 minutes to form Uniform slurry. Inject the slurry into the mold, and use vacuum suction to remove most of the liquid from the mold. When most of the liquid in the slurry is removed, the speed of the vacuum suction gas is 10m / min-12m / min ;When the slurry is formed and no liquid leaks out, take it out, place the formed slurry in a microwave dryer with a power of 700W and dry it to a constant weight. At this time, the silica sol inside the slurry is completely dried and solidified to form a rigid structure; then 600°C Calcined for 3 hours, the heating rate during the calcination process was 10° C. / min, and it was taken out after returning to room...

Embodiment 2

[0064] This example provides a method for preparing a catalytic filter composite element. Compared with Example 1, the only difference is that the power of microwave drying in Step 2 is 231W, and other experimental steps and experimental parameters are the same as in Example 1.

Embodiment 3

[0066] This example provides a method for preparing a catalytic filter composite element. Compared with Example 1, the only difference is that the microwave drying power in Step 2 is 700W, and other experimental steps and experimental parameters are the same as in Example 1.

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Abstract

The invention provides a catalytic filtration composite element as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing ceramic fibers, silica sol and a dispersing agent to form uniform slurry, mixing the slurry, injecting the mixed slurry into a mold, conducting molding, then performing demolding, and carrying out drying and calcining to obtain a base material; immersing the base material in a first solution, keeping the base material in vacuum for a period of time, taking out the base material, and carrying out microwave drying and roasting to obtain an intermediate element; and immersing the intermediate element in a second solution, keeping the intermediate element in vacuum for a period of time, taking out the intermediate element, and carrying out microwave drying and roasting to obtain the catalytic filtration composite element. The invention further provides the catalytic filtration composite element prepared by using the preparation method and application of the catalytic filtration composite element in synergistic removal of particulate matters and NOx. The composite element is large in pore, high in toughness, large in specific surface area, low in pressure drop, high in filtering efficiency and high in catalytic activity.

Description

technical field [0001] The invention relates to the technical field of integrated purification of high-temperature flue gas, in particular to a catalytic filter composite element and its preparation method and application. Background technique [0002] With the continuous improvement of flue gas emission standards and the increasingly severe environmental protection situation, the comprehensive treatment and purification of combustion flue gas pollutants has become the top priority in the field of energy and environment in my country. Dust particles and nitrogen oxides (NO) x ) is the main component of air pollutants, and it is also the root cause of a series of environmental problems such as smog, photochemical smog and acid rain. In the traditional high-temperature flue gas purification process, dust removal and catalytic denitrification are two independent operating units. Usually, the ammonia gas (NH 3 ) under the action of catalyst will NO x Reduced to non-toxic, non...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30B01J35/10B01J35/02B01D53/86B01D53/56B01D46/24
CPCB01J23/30B01J35/1004B01J35/023B01D53/8628B01D46/2411B01D2258/0283
Inventor 吴小林苗林丰姬忠礼常程刘震陈锋
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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