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Nitric oxide adsorbent prepared by supercritically modifying natural zeolite

A technology of nitrogen oxides and natural zeolite, applied in the direction of silicon compounds, inorganic chemistry, and other chemical processes, to achieve low production costs and broad market prospects

Inactive Publication Date: 2011-06-15
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although my country's natural zeolite reserves are large, most of them are only used as primary products. For example, as cement mixture materials, it accounts for 85% of zeolite production, and most of the rest are used as fillers for paper and other light industrial products. Except Zhejiang University The Institute of Catalysis has successfully prepared a series of organic waste gas incineration catalysts (Zheng Xiaoming, Jin Songshou, etc. CN 1034319A, CN 1034494A) as a catalyst carrier, but there are few examples of successful use in the industrialization of fine chemicals

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Get 30g of natural mordenite in a 500ml three-neck bottle, add 300ml according to the solid-to-liquid ratio of zeolite and acid as 1:10, stir 1M HCl solution at 100°C for 8 hours, wash with water, dry, and repeat the operation for 5 Second-rate;

[0024] (2) Put 25g of the zeolite material treated in (1) into a 500ml three-necked bottle, and add 250ml of 0.1M NH 4 The Cl solution was stirred at 100°C for 6 hours, washed with water, dried, and repeated 8 times;

[0025] (3) Take 2 g of the zeolite treated in (2), and use tetrabutyl titanate as the titanium source, and the molar ratio of the zeolite to the zeolite is 1:10. With n-hexane as the supercritical medium, the solid-to-liquid ratio of zeolite and supercritical medium is 1:5, and 10 ml of n-hexane is added. It was titanized at 240°C for 5 hours under the supercritical state of n-hexane, washed with alcohol, dried, and operated once. Finally, bake at 300°C for 5 hours;

[0026] (4) Take 1 g of the sample tr...

Embodiment 2

[0029] (1) Take 30g of natural mordenite in a 500ml three-neck bottle, add 150ml of 12M HNO according to the solid-liquid ratio of zeolite and acid at 1:5 3 The solution was stirred at 70°C for 1 hour, washed with water, dried, and operated once;

[0030] (2) Put 25g of the zeolite material treated in (1) in a 1000ml three-necked bottle, and add 625ml of 0.5M NH 4 The Cl solution was stirred at 80°C for 1 hour, washed with water, dried, and repeated 4 times;

[0031] (3) Take 2 g of the zeolite treated in (2), and use isobutyl titanate as the titanium source, and the molar ratio of the zeolite to the zeolite is 1:100. Taking ethanol as the supercritical medium, the solid-to-liquid ratio of the zeolite to the supercritical medium is 1:25, and 50ml of ethanol is added. Titanize at 250°C for 1 hour in the supercritical state of ethanol, wash with alcohol, and dry, repeating the operation 4 times. Finally, bake at 600°C for 5 hours;

[0032] (4) Take 1 g of the sample treated ...

Embodiment 3

[0035] (1) Get 30g of natural clinoptilolite in a 1000ml three-necked bottle, add 750ml of 6M H 2 SO 4 The solution was stirred at 80°C for 4 hours, washed with water, dried, and repeated 3 times;

[0036] (2) Put 25g of the zeolite material treated in (1) in a 500ml three-necked bottle, and add 125ml of 1M NH 4 The Cl solution was stirred at 70°C for 12 hours, washed with water, dried, and operated once;

[0037](3) Take 2 g of the zeolite treated in (2), and use isopropyl titanate as the titanium source, and the molar ratio of the zeolite to the zeolite is 1:50. Using cyclohexane as the supercritical medium, the solid-to-liquid ratio of the zeolite to the supercritical medium is 1:50, and 100 ml of cyclohexane is added. Titanization was performed at 280° C. for 3 hours under the supercritical state of cyclohexane, washed with alcohol, and dried, and the operation was repeated twice. Finally, bake at 450°C for 5 hours;

[0038] (4) Take 1 g of the sample treated in (3) a...

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Abstract

The invention relates to the technology of natural zeolite material modification and aims to provide a nitric oxide adsorbent prepared by supercritically modifying natural zeolite. The adsorbent is prepared by a method comprising the following steps: dissolving a volatile metallo-organic compound into a supercritical medium and placing the natural zeolite undergoing dealuminzation and ammonium exchange in the atmosphere to carry out supercritical replacement in the supercritical atmosphere; drying at the temperature of 120 DEG C after alcohol washing and water washing and then roasting at the temperature of 300-600 DEG C, thus obtaining the metal element containing nitric oxide adsorbent prepared by modifying natural zeolite, wherein the volatile metallo-organic compound is any one of ester, alcoholate or corresponding metal chloride which can be dissolved in the supercritical medium of Ti, Zr, Al, V or Sn. The adsorbent can be used as the environmental function material and is used for adsorbing and purifying the industrial tail gases, flue gases and automobile tail gases containing nitric oxides. The nitric oxide adsorbent has low production cost and has wide market prospect as the environmental function material.

Description

technical field [0001] The invention belongs to the modification technology of natural zeolite materials, in particular to a nitrogen oxide adsorbent prepared by modification of natural zeolite. Background technique [0002] In the process of transforming the natural environment and creating the social environment, human beings have caused damage to the environment at the same time. Especially in the past 100 years, environmental problems have become increasingly serious and have threatened the survival and development of human beings. Environmental issues have therefore aroused widespread concern around the world. Nitrogen oxide is an important air pollution gas, an important factor in the formation of acid rain and photochemical pollution, and it can also cause harm to human health. It can irritate human eyes, nose, throat and lungs, and easily cause respiratory diseases . There are many ways to remove nitrogen oxides, which can be generally divided into two categories:...

Claims

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Application Information

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IPC IPC(8): B01J20/30B01J20/16B01D53/02
Inventor 郑小明王卉于琴琴周慧刘彤肖丽萍
Owner ZHEJIANG UNIV
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