高等学校化学学报 ›› 1992, Vol. 13 ›› Issue (10): 1274.

• 论文 • 上一篇    下一篇

(K,Na)ZSM-5的酸碱性质及催化性能

陶克毅, 高峰, 温朗友, 陈忠明, 臧雅茹, 李赫咺   

  1. 南开大学化学系, 天津, 300071
  • 收稿日期:1991-10-15 修回日期:1992-01-25 出版日期:1992-10-24 发布日期:1992-10-24
  • 通讯作者: 陶克毅
  • 基金资助:

    国家自然科学基金;国家教育委员会博±点基金

Acid-Base and Catalytic Properties of (K,Na)ZSM-5 Zeolites

TAO Ke-Yi, GAO Feng, WEN Lang-You, CHEN Zhong-Ming, ZANG Ya-Ru, LI He-Xuan   

  1. Department of Chemistry, Nankai University, Tianjin, 300071
  • Received:1991-10-15 Revised:1992-01-25 Online:1992-10-24 Published:1992-10-24

摘要: 采用红外光谱、程序升温脱附、原子吸收光谱、等离子光谱、Hammett指示剂非水滴定和催化活性测试等方法研究了经不同浓度的KOH溶液交换得到的(K,Na)ZSM-5的酸碱性质。结果表明,(K,Na)ZSM-5具有中等强度的L酸位(K+,Na+)及弱碱位(AlO4-或骨架O2-)和强碱位(OH-).KOH浓度增大.酸性减弱,碱性增强.所得(K,Na)ZSM-5具有较高的异丙醇脱氢、脱水活性.催化性能与酸碱性密切相关.

关键词: (K, Na)ZSM-5分子筛, 酸碱性质, 催化性能

Abstract: The acid-base properties of a series of (K,Na)ZSM-5 zeolites with various contents Kwere investigated by IR,TPD,Hammett-Indicator non-aqueous titration and measurement of catalytic properties.The KOHexchanged ZSM-5 zeolites have moderate Lewis acid sites(cation,Na+,K+) and two different kinds of base sites,the weak ones (AlO4-or framework oxygen ions) and the strong ones(OH-).The acidity decreases while the basicity increases with increasing the concentrations of exchanging KOHsolutions.The samples exhibit higher catalytic activities for the dehydrogenation and dehydration of isopropanol.The catalytic properties correlate well with the acid-base properties.

Key words: (K,Na)ZSM-5 zeolite, Acid-base properties, Catalytic activities

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