Plasma reactor catalyst and its preparation method and use

A plasma and catalyst technology, applied in the field of photochemical catalysis, can solve the problem of difficult control of the amount of hydrocarbons, and achieve the effects of avoiding the generation of new pollutants, simple use process, and reducing the content of by-products such as NOx

Active Publication Date: 2008-03-19
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

However, the amount of hydrocarbons introduced in this method is difficult to control, often accompanied by new pollutants

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0018] One step of the preparation method of supported catalyst of the present invention is:

[0019] (1) Loading active components on ZSM-5 molecular sieve: place ZSM-5 molecular sieve powder in a solution of pyrolyzable water-soluble metal salt of active metal components, and fully stir at 10-90°C for 8-48 hours, after standing still, filter off the excess solution, dry at 60-200°C at a low temperature, and then bake at 400-800°C for 2-6 hours to obtain a powder catalyst containing 0.5%-10% active metal components;

[0020] (2) Catalyst molding: adding 5-20% (wt%) binder, 1-3% (wt%) pore-expanding to the powder catalyst prepared in the step (1) of 77-94wt% by weight The agent is mixed evenly, and a dilute nitric acid solution with a concentration of 2-10% is added to the aforementioned mixture to account for 30-50% (wt%) of the weight of the mixture. After drying, it is dried at 400-600°C for 2-4 hours to obtain a strip-shaped catalyst with a lateral pressure greater than 2...

Embodiment 1

[0027] Embodiment 1: the preparation of Cu / ZSM-5 catalyst

[0028] Weigh 50 grams of H-ZSM-5 molecular sieve with a silicon-aluminum ratio of 25 into a beaker, add 1 L of an aqueous solution containing 5.0 grams of copper acetate, stir at room temperature for 24 hours, let stand and pour off the supernatant, and bake at 120 ° C Dry. Grind the catalyst prepared by drying into powder, add 15 grams of hydrated alumina (pseudoboehmite), 3 grams of organic pore-enlarging agent, mix well and add 40 mL of dilute nitric acid solution with a concentration of 5.0 V%, and continue kneading to form block, and then extruded into a clover shape of φ=2.0mm with an extruder. After drying at 100°C for 2 hours, the temperature was raised to 600°C at a rate of 2°C / min for 4 hours, and the clover-shaped strip-shaped Cu / ZSM-5 catalyst was prepared after cooling. The Cu content in this catalyst is about 5.0 w%.

Embodiment 2

[0029] Embodiment 2: the preparation of Ag / ZSM-5, Co / ZSM-5 catalyst

[0030] Take by weighing 50 grams of H-ZSM-5 molecular sieves with a silicon-aluminum ratio of 25 in a beaker, add 1 L of an aqueous solution containing 3.0 grams of silver nitrate, then obtain an Ag / ZSM with an Ag content of about 3.0w% by the method in Example 1. ZSM-5 catalyst.

[0031] In the above method, a Co / ZSM-5 catalyst with a content of about 3.0w% can be prepared by using 1 L of a solution containing 4.0 grams of cobalt nitrate instead of a silver nitrate solution.

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Abstract

The invention provides a catalyst, which has the comprehensive functions of removing various volatile pollutants of different properties via the function of plasma and reducing the content of NOX, and the preparation method and the application. The catalyst is pure ZSM-5 zeolite or adopts industrial commercial grade ZSM-5 zeolite as the carrier to load one or more than one of active components such as copper, silver, gallium and cobalt, etc, and adopts the active component or components as discharge carrier (filling material) after molding to directly fill in the plasma reactor for operation. Compared with other filling medium or catalyst in the plasma reactor, the catalyst is not only capable of reducing the content of by-products such as NOX but also has brilliant capacities of removing various volatile pollutants. And compared with the method of reducing the by-product of NOX by adding reducing atmosphere into the plasma reactor, the invention of the catalyst is characterized in that the process is simple and no added device or given atmosphere is needed, which avoids the production of new pollutants.

Description

technical field [0001] The invention belongs to the field of photochemical catalysis, and more specifically relates to a method for comprehensively removing various volatile pollutants with different properties under the action of plasma while reducing NO x Content of the catalyst and its preparation and use. Background technique [0002] Indoor air purification technology has been widely paid attention to by people, and various air purifiers for removing harmful substances in the air have been developed accordingly. Among them, the adsorption and absorption method is the most widely used because of its simplicity; the photocatalytic oxidation method is the cleanest because it can completely decompose organic pollutants into water and carbon dioxide; the high-voltage electrostatic method can effectively remove fine floating dust in the air. However, these methods have certain application limitations and need to be changed according to the specific environment. For the envir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/42A61L9/22
Inventor 付贤智刘平员汝胜邵宇丁正新戴文新陈旬王绪绪
Owner FUZHOU UNIV
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