Adsorption properties of ZSM-5 zeolites

被引：14

作者：

Hudec, P ^{[1
]}

Smieskova, A

Zidek, Z

Zubek, M

Schneider, P

Kocirik, M

Kozankova, J

机构：

[1] Slovak Tech Univ Bratislava, Dept Petr Technol & Petrochem, Bratislava 81237, Slovakia

[2] Res Inst Petr & Hydrocarbon Gases, Bratislava 82412, Slovakia

[3] Acad Sci Czech Republic, Inst Chem Proc Fundamentals, CR-16502 Prague 6, Suchdol, Czech Republic

[4] Acad Sci Czech Republic, J Heyrovsky Inst Phys Chem, CR-18223 Prague 8, Czech Republic

[5] Slovak Tech Univ Bratislava, Dept Ceram Glass & Cement, Bratislava 81237, Slovakia

来源：

COLLECTION OF CZECHOSLOVAK CHEMICAL COMMUNICATIONS | 1998年 / 63卷 / 02期

关键词：

ZSM-5; zeolites; adsorption; t-plot; crystal size and morphology; microporosity;

D O I：

10.1135/cccc19980141

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Adsorption properties determined by physical adsorption of nitrogen for a series of ZSM-5 zeolite samples with various Si/Al ratios and different crystal size were compared. In addition to the BET method, the t-plot method was used to, determine the microporosity of samples. Very small crystals of ZSM-5 zeolites, generally below 1 mu m, with Si/Al ratio between 14 and 21 exhibit adsorption isotherms typical for purely microporous solids. Samples with Si/Al ratios larger than (about) 95 show low-pressure-steps and hysteresis loops and, depending on crystal morphology, also high-pressure hysteresis loops. The low-pressure steps were associated with steps on t-plots which showed two linear parts. Small increase of adsorption up to relative pressure 0.2 is characteristic for samples with Si/Al ratios between 25 and 50.

引用

页码：141 / 154

页数：14

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