用正电子研究水热处理对NH₄ NaY沸石结构的影响

用正电子研究水热处理对NH 4 NaY沸石结构的影响 The Effect of Hydrothermal Modification on the Structure of the NH 4 NaY Zeolite Studied by Positrons 朱俊 ZHU Jun 1 1 2 first-author 马莉 MA Li 1 1 2 王少阶 WANG Shao\|jie 1 1 2 罗锡辉 LUO Xi\|hui 2 1 2 武汉大学物理学系,武汉,430072 武汉大学物理学系,武汉,430072 Department of Physics, Wuhan University Department of Physics, Wuhan University 抚顺石油化工研究院,抚顺,113001 抚顺石油化工研究院,抚顺,113001 Fushun Research Institute of Petroleum and Petrochemicals Fushun Research Institute of Petroleum and Petrochemicals 用正电子湮没谱学研究了水热处理时间及温度对ＮＨ４ＮａＹ沸石的影响．测量了ＮＨ４ ＮａＹ 沸石分子筛在７００ ℃经不同的水热处理时间（０．２５ ～４ ｈ）和在不同温度（３００ ～８００ ℃）下水热处理１ ｈ 后的正电子寿命谱，所有谱中都出现了５ 个寿命分量，其第中５ 寿命及其强度与生成二次孔的大小和数量相关．实验表明在一定温度范围内ＮＨ４ＮａＹ 沸石经水热处理后都能产生二次孔，其中水热处理温度为６５０ ℃处理时间为１ ｈ 所产生的二次孔不仅数量最多而且孔直径最大． The effect of the hydrothermal modification on the structure of NH 4NaY zeolite was studied by positron annihilation spectroscopy. We measured the positron lifetime spectroscopy as a function of the times （0.25 ～ 4 h） at 700 ℃ and the temperature （300 ～ 800 ℃） of one hour of the hydrothermal modification for the NH 4NaY zeolite. All lifetime spectra were resolved into five components. The fifth lifetime components and thier intensities are related to the size and number of the second pores. The experimental results showed that the second pore in the NH 4NaY zeolite were produced by hydrothermal modification at some temperature range, and the maximum of the size and number of the second pores were observed in the materials at 650 ℃ for 1 h. 正电子湮没谱学 水热处理 沸石 二次孔 positron annihilation spectroscopy hydrothermal treatment zeolite secondary pore TQ426.61 国家自然科学基金(61672102) 1999-05-01 2021-04-01 5