THE REDUCTION OXIDATION BEHAVIOR OF MNAPO-5 AS STUDIED BY ESR SPECTROSCOPY

被引：16

作者：

KATZMARZYK, A

ERNST, S

WEITKAMP, J

KNOZINGER, H

机构：

[1] UNIV STUTTGART,INST TECH CHEM 1,W-7000 STUTTGART 80,GERMANY

[2] UNIV MUNICH,INST PHYS CHEM,W-8000 MUNICH 2,GERMANY

来源：

CATALYSIS LETTERS | 1991年 / 9卷 / 1-2期

关键词：

ALPO4-BASED MOLECULAR SIEVE; MNAPO-5; ESR-SPECTROSCOPY; REDOX CHEMISTRY; HYDRATION DEHYDRATION; MN-LOCATION; MN-COORDINATION;

D O I：

10.1007/BF00769085

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：

It is shown by ESR spectroscopy that Mn2+ ions in MnAPO-5 are oxidized to Mn3+ during calcination at T greater-than-or-equal-to 475 K. Mn2+ occupies variously distorted tetrahedral positions within the framework and in extra-lattice sites. Octahedrally coordinated Mn2+ presumably located in the channels becomes detectable after adsorption of water. The ESR spectra of reduced MnAPO-5 show line-narrowing due to spin exchange interactions. The material behaves reversible in redox cycles at temperatures near 500 K.

引用

页码：85 / 90

页数：6

共 8 条

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