CUBIC AND HEXAGONAL FAUJASITES WITH VARYING SI/A1 RATIOS .1. SYNTHESIS AND CHARACTERIZATION

被引：27

作者：

LOHSE, U ^{[1
]}

PITSCH, I ^{[1
]}

SCHREIER, E ^{[1
]}

PARLITZ, B ^{[1
]}

SCHNABEL, KH ^{[1
]}

机构：

[1] HUMBOLDT UNIV BERLIN,INST ANORGAN & ALGEMEINE CHEM,D-10115 BERLIN,GERMANY

来源：

APPLIED CATALYSIS A-GENERAL | 1995年 / 129卷 / 02期

关键词：

FAUJASITES (CUBIC AND HEXAGONAL); DEALUMINATION; INFRARED MEASUREMENTS; NONFRAMEWORK ALUMINUM; NITROGEN ISOTHERMS; TEMPERATURE-PROGRAMMED DESORPTION OF AMMONIA;

D O I：

10.1016/0926-860X(95)00092-5

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Zeolite faujasite type with hexagonal structure (EMT) and zeolite faujasite types with cubic structure (FAU) were synthesized with crown ethers as templating agents. The Si/Al ratio of the as-synthesized samples was determined to 3.7. The samples were dealuminated by steaming at 773, 873 and 1073 K, respectively. A part of the dealuminated samples was treated with diluted acid to extract the non-framework aluminum. Nature and concentration of the acid centres were estimated by IR spectroscopy and TPDA measurements. From N-2 isotherms follows that the extracted samples undergo a partial damage of the structure. It seems that the EMT samples are more stable in the process of steaming and extraction with diluted acid.

引用

页码：189 / 202

页数：14

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