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化学学报
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化学学报 ›› 1981, Vol. 39 ›› Issue (1): 31-36. 上一篇    下一篇

论文

氢型丝光沸石的酸性质

薛志元, 黄月芳, 舒义静, 杨小平   

  1. 复旦大学化学系 上海
  • 投稿日期:1979-02-12 发布日期:2013-06-03

ACIDITY OF H+ MORDENITE

XUE ZHI-YUAN, HUANG YUE-FANG, SHU YI-JING, YANG XIAO-PING   

  1. Department of Chemistry, Fudan University, Shanghai
  • Received:1979-02-12 Published:2013-06-03

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1077

被引次数

15

盐酸交换的氢型丝光沸石(HM),经400℃煅烧,室温吸附吡啶后,在低于400℃温度下进行脱附.吡啶在Lewis酸,Brönsted酸位置的光吸收,随脱附温度有线性变化.Lewis酸光吸收增强,Brönsted酸光吸收减弱.从光吸收改变量直接求得两种酸的消光系数比值ε1460厘米-1L/ε1545厘米-1B=1.44±0.10.用脉冲色谱中毒技术,测定吡啶吸附总量后,可得到摩尔消光系数εL=4.87厘米/微摩尔εB=3.38厘米/微摩尔采用上述方法,测定了HM表面上的酸分布.结果表明:Brönsted酸的浓度随煅烧温度的增加而下降,甲苯歧化的活性只与Brönsted酸的存在有关.

The H+ mordenite sample was prepared by hydrochloric acid exchange.It was calcined under vaouum at 400℃ for 24 hr,cooled to room temperature and then allowed to adsorb pyridine vapour for 30 min.The absorption bands of pyridine adsorbed on H+ mordenite surfaoe were observed at relatively low temperature,after oalcination in vacuum the temperatures of ealcination being 250°,300°,350°,and 400℃.