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Use of zinc-magnesium-aluminium ternary hydrotalcite as nitrogen oxide adsorbent

A zinc-magnesium-aluminum ternary and nitrogen oxide technology, applied in other chemical processes, chemical instruments and methods, separation methods, etc.

Inactive Publication Date: 2005-10-19
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

NO x The research on the excellent adsorption performance of the

Method used

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  • Use of zinc-magnesium-aluminium ternary hydrotalcite as nitrogen oxide adsorbent
  • Use of zinc-magnesium-aluminium ternary hydrotalcite as nitrogen oxide adsorbent
  • Use of zinc-magnesium-aluminium ternary hydrotalcite as nitrogen oxide adsorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] By Zn(NO 3 ) 2 ·6H 2 O, Mg(NO 3 ) 2 ·6H 2 O and Al(NO 3 ) 3 9H 2 O is made into 100mL solution A according to molar ratio Zn / Mg / Al=2:4:2, and wherein aluminum ion content is 0.4mol / L; NaOH, Na 2 CO 3 Prepare 100mL solution B, wherein the concentration of NaOH is 3.2mol / L, Na 2 CO 3 The concentration is 0.8mol / L. Add solution A and solution B dropwise to 200ml of deionized water at the same time, keep the dropping rate of 1 drop / second, keep the temperature at 40°C, stir vigorously, keep the pH value at about 9, continue to stir for a while after the dropwise addition, at 65 ℃ for 14 hours, centrifuged, beaten and washed until neutral, and dried at 70 ℃ for 15 hours to obtain a ternary hydrotalcite sample.

Embodiment 2

[0017] By Zn(NO 3 ) 2 ·6H 2 O, Mg(NO 3 ) 2 ·6H 2 O and Al(NO 3 ) 3 9H 2 O is made into 100mL solution A according to Zn / Mg / Al=4:2:2, wherein the aluminum ion content is 0.4mol / L; NaOH, Na 2 CO 3 Prepare 100mL solution B, wherein the concentration of NaOH is 3.2mol / L, Na 2 CO 3 The concentration is 0.8mol / L. Add solution A and solution B dropwise to 200ml of deionized water at the same time, keep the dropping rate of 1 drop / second, keep the temperature at 40°C, stir vigorously, keep the pH value at about 9, continue to stir for a while after the dropwise addition, at 65 ℃ for 14 hours, centrifuged, beaten and washed until neutral, and dried at 70 ℃ for 15 hours to obtain a ternary hydrotalcite sample.

Embodiment 3

[0019] By Zn(NO 3 ) 2 ·6H 2 O, Mg(NO 3 ) 2 ·6H 2 O and Al(NO 3 ) 3 9H 2 O is prepared into 100mL solution A according to the molar ratio Zn / Mg / Al=3:3:2, wherein the aluminum ion content is 0.4mol / L; NaOH, Na 2 CO 3 Prepare 100mL solution B, wherein the concentration of NaOH is 3.2mol / L, Na 2 CO 3 The concentration is 0.8mol / L. Add solution A and solution B dropwise to 200ml of deionized water at the same time, keep the dropping rate of 1 drop / second, keep the temperature at 40°C, stir vigorously, keep the pH value at about 9, continue to stir for a while after the dropwise addition, at 65 ℃ for 14 hours, centrifuged, beaten and washed until neutral, and dried at 70 ℃ for 15 hours to obtain a ternary hydrotalcite sample.

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Abstract

The present invention relates to the use of ternary Zn2Mg4Al2 hydrotalcite as NOx adsorbent. The ternary Zn2Mg4Al2 hydrotalcite has adsorbing rate and saturated adsorption amount higher than that of active carbon, and especially has maximum saturated NOx adsorption amount at normal temperature up to 1082 mg / g.

Description

(1) Technical field [0001] The invention relates to the adsorption application of zinc-magnesium-aluminum ternary hydrotalcite. (2) Background technology [0002] Nitrogen oxides (NO x ) The pollution of the environment has been widely concerned all over the world, and the effective elimination of NO x It is a hot topic of current research. Currently removing NO x There are two types of methods: non-catalytic and catalytic. Non-catalytic methods mainly include wet absorption method, solid absorption method, electron beam irradiation method, biological method, etc., but these methods have problems such as huge equipment, high cost, and secondary pollution. Catalytic laws include catalytic decomposition and catalytic reduction. The catalytic decomposition method is to directly decompose NO into N under the action of a catalyst. 2 . Because the total decomposition temperature of NO is too high, and NO often coexists with one or several reducing gases (CO, low-carbon hydr...

Claims

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Application Information

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IPC IPC(8): B01D53/04B01J20/08
Inventor 倪哲明
Owner ZHEJIANG UNIV OF TECH
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