高等学校化学学报

高等学校化学学报 ›› 2001, Vol. 22 ›› Issue (1): 10.

• 研究论文 • 上一篇    下一篇

超微NaY分子筛的合成(Ⅱ)──添加铝络合剂的影响

晁自胜1, 林海强1, 陈国周1, 吴廷华1, 万惠霖1, 闵恩泽2   

  1. 1. 厦门大学固体表面物理化学国家重点实验室, 厦门 361005;
    2. 中国石化集团公司北京石油化工科学研究院, 北京 100083
  • 收稿日期:1999-06-04 出版日期:2001-01-24 发布日期:2001-01-24
  • 通讯作者: 晁自胜(1967年出生),男,博士,副教授,从事分子筛合成及多相催化研究.
  • 基金资助:

    中国石化集团公司科技开发项目(批准号:X598010)资助

Synthesis of Ultrafine Zeolite NaY(Ⅱ)——Effect of Complexing Agent

CHAO Zi-Sheng1, LIN Hai-Qiang1, CHEN Guo-Zhou1, WU Ting-Hua1, WAN Hui-Lin1, MIN EN Ze2   

  1. 1. Chemistry Department and State Key Laboratory for Physical Chemistry of Solid Surface, Xiamen University, Xiamen 361005, China;
    2. Research Institute of Petroleum Processing, SINOPEC, Beijing 100083, China
  • Received:1999-06-04 Online:2001-01-24 Published:2001-01-24

PDF (PC)

被引次数

95

摘要： NaY分子筛合成体系中添加铝的络合剂(乙二胺四乙酸、柠檬酸和醋酸),可有效地减小分子筛的晶粒尺寸及增加分子筛的晶化速度和SiO2/Al2O3物质的量比.在添加柠檬酸的合成体系中,考察了柠檬酸的添加量对NaY分子筛晶化行为的影响.发现存在着一个最佳的柠檬酸的添加量范围,即n(柠檬酸):n(氧化铝)≤2:1,在此范围内,NaY的晶化速率和硅铝比较高,而晶粒尺寸较小.

关键词: 超微分子筛, NaY, 合成, 晶粒尺寸, 络合剂

Abstract: Ultrafine zeolite NaYwas hydrothermally synthesized with silica sol and Al2(SO4)3 as silica and alumina sources, respectively, by adding complexing agent such as citrate, acetate or editate to synthesis batch. The effect of the amount of citrate on the crystallization rate, SiO2/Al2O3 ratio and crystal size of as synthesized zeolite NaYwas investigated. When the relatively lower amount of citrate[ n (citrate): n (Al2O3) ≤2:1] was added, both the crystallization rate and the SiO2/Al2O3 ratio increased while the crystal size reduced obviously comparing with that in the absence of citrate. This indicates that the nucleation and crystallization of zeolite NaYwas promoted by complexing agent. When the relatively higher amount of citrate[ n (citrate): n (Al2O3)>2:1] was added, the above promotion effect diminished. The crystallization rate was found to reduce comparing with that in the absence of citrate, although the crystal size was still smaller than that in the later case. The optimum amount of citrate added to batch appears to be at the citrate:Al2O3 molar ratio of 1.5:1. The similar promotion effect was also observed both for the addition of editate and acetate with the molar ratio of editate:Al2O3 and acetate:Al2O3 equal to 1.5, respectively. The promotion effect of complexing agents to the nucleation and crystallization of zeolite NaYwas related with their complexing ability to aluminum.

Key words: Ultrafine zeolite, NaY, Synthesis, Crystal size, Complexing agent

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