Positron annihilation in zeolite USY

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Positron annihilation in zeolite USY

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- Positron annihilation in zeolite USY
- NUCLEAR TECHNIQUES Issue 6, (1998)
- 作者机构：
  
  1. 武汉大学,武汉
  2. 抚顺石油化工研究院,抚顺
  3. ,113001
- 作者简介：
- 基金信息：
- DOI：
  CLC： O647
- Published：01 June 1998
- 稿件说明：
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[1]马莉,陈志权,王少阶,罗锡辉.USY沸石中的正电子湮没[J].核技术,1998(06):334-339.

Positron annihilation in zeolite USY[J]. Nuclear techniques, 1998, (6): 334-339.
[1]马莉,陈志权,王少阶,罗锡辉.USY沸石中的正电子湮没[J].核技术,1998(06):334-339. DOI：

Positron annihilation in zeolite USY[J]. Nuclear techniques, 1998, (6): 334-339. DOI：

摘要

用正电子湮没方法研究了Y型沸石脱铝（高温水热处理）前后孔结构的变化，测量了在不同空气压强中的正电子寿命谱。在真空中得到脱铝前NaY沸石有4个寿命分量，脱铝后USY沸石有5个寿命分量．实验结果表明，经离子交换及高温水热处理后沸石中产生了“二次孔”。并且随着吸附空气的增加，USY沸石的τ5、I5明显减小。

Abstract

The structural change of the Y type zeolite was studied before and after dealumination by the positron annihilation technique. Four lifetime components were obtained in the NaY zeolite

while five lifetime components appeared in the USY zeoIite after dealumination. The positron lifetimes of the USY zeolite under different air pressures were measured and it was found that the longest-lived component T5 and its intensity I5 decreased strongly with the increase of air pressure. The result showed that secondary pores were formed in the USY zeolite after ion exchange and high- temperature hydrothermal treatment.

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