Nitrogen oxide adsorbent prepared through ion exchange modification of natural zeolite

A nitrogen oxide, natural zeolite technology, applied in silicon compounds, inorganic chemistry, filtration and separation, etc., to achieve the effects of low production cost, large adsorption capacity, and broad market prospects

Inactive Publication Date: 2011-05-11
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the reserves of natural zeolite in my country are large, most of them are only used as primary products. For example, as cement mixture materials, it accounts for 85% of the zeolite output, 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 as a catalyst carrier (Zheng Xiaoming, Jin Songshou, etc. CN 1034319A, CN 1034494A), and 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

[0022] (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 12 hours, wash with water, dry, and repeat the operation for 5 Second-rate;

[0023] (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;

[0024] (3) Take 2g of the zeolite treated in (2) and place it in a 50ml three-necked flask, and add 10ml of 1M NaNO according to the solid-to-liquid ratio of zeolite and ion exchanger metal salt as 1:5. 3 The solution was stirred at 100°C for 1 hour, washed with water, dried, operated once, and finally roasted at 600°C for 1 hour;

[0025] (4) Take 1 g of the sample treated in (3) and put it into a quartz reaction tube, pretreat it at 500° C. for 1 hour under an oxygen or helium atmosphere, and then perfo...

Embodiment 2

[0028] (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;

[0029] (2) Put 25g of the zeolite material treated in (1) in a 1000ml three-necked bottle, and add 625ml of 0.5M NH 4 NO 3 The solution was stirred at 85°C for 1 hour, washed with water, dried, and repeated 4 times;

[0030] (3) Get 2g of zeolite treated in (2) and place it in a 50ml three-necked bottle. The solid-to-liquid ratio of zeolite and ion exchanger metal salt is 1: 50, add 100ml, 0.01M Ca(NO 3 ) 2 The solution was stirred at 60°C for 6 hours, washed with water, dried, and repeated 4 times, and finally roasted at 300°C for 5 hours;

[0031] (4) Take 1 g of the sample treated in (3) and put it into a quartz reaction tube, pre-treat it at 500° C. for 1 hour in an oxygen atmosphere, cool it down to room temperature, and pe...

Embodiment 3

[0034] (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 85°C for 6 hours, washed with water, dried, and repeated 8 times;

[0035] (2) Place 25g of the zeolite material treated in (1) in a 500ml three-necked bottle, and add 125ml of 1M (NH 4 ) 2 SO 4 The solution was stirred at 70°C for 12 hours, washed with water, dried, and operated once;

[0036] (3) Take 2g of zeolite treated in (2) and place it in a 50ml three-necked bottle. The solid-to-liquid ratio of zeolite and ion exchanger metal salt is 1:25, add 50ml, 0.5M KNO 3 The solution was stirred at 20°C for 12 hours, washed with water, dried, and repeated 8 times, and finally roasted at 450°C for 3 hours;

[0037](4) Take 1 g of the sample treated in (3) and put it into a quartz reaction tube, pre-treat it at 500° C. for 1 hour in an oxygen atmosphere, cool it down to room temperature, and perform nitrogen oxide adsorption. The concentration of...

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Abstract

The invention relates to the modification technology of natural zeolite material and aims to provide a nitrogen oxide adsorbent prepared through ion exchange modification of the natural zeolite. The adsorbent is prepared through the following step: adding the natural zeolite after dealumnization processing and ammonium exchange processing into metal salt aqueous solution to be subjected to metal ion exchange; and washing, drying and then roasting at the high temperature of 300-600 DEG C for 1-5 hours to obtain the nitrogen oxide adsorbent of modified natural zeolite containing corresponding metal elements, wherein the metal salt is any one of hydrochloride, nitrate, sulfate or oxalate of Na, Ca, K, Ba, Ti, Mn, Ni or Cu. The nitrogen oxide adsorbent prepared through modification of the natural zeolite can be used as an environment function material for adsorbing and purifying the industrial tail gas, flue gas and automobile exhaust containing nitrogen oxide. The nitrogen oxide adsorbent is low in production cost and large in adsorption quantity, and has a broad market prospect as the environment 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 ion exchange modification of natural zeolite. Background technique [0002] As human society enters the 21st century, people pay more and more attention to environmental issues. 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: non-catalytic methods and catalytic methods. Non-catalytic methods are mainly divided into solid absorption method and liquid absorption method. For example, molecular sieve, activated carbon and silica gel are common solid adsorbents, while acid and lye are common liquid adsorbents...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/16B01J20/32B01J20/34B01D53/04
Inventor 郑小明王卉于琴琴周慧刘彤肖丽萍
Owner ZHEJIANG UNIV
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