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对不同条件下制备的催化剂样品S_(?)和S_(16)进行了磁性和磁场中的穆斯堡尔谱测量。这两种样品中的Cr~(3+)离子都进入了Fe_2O_3晶格。样品S_(?)的颗粒度比S_(16)小,催化活性也比S_(16)好,但S_(16)中γ-Fe_2O_3的含量比S_(?)中的大50％。造成S_(?)比S_(16)活性好的主要因素是S_(?)样品的颗粒度小,比表面积大。存放五年以后S_(?)a样品的穆斯堡尔谱的超顺磁性部分有明显增加。这可能是,随着时间的变化,S_(?)样品中不均匀分布的Cr~(3+)离子有一个缓
The magnetic and magnetic Mossbauer spectra of S_ (?) And S_ (16) catalysts prepared under different conditions were measured. The Cr 3+ ions in both samples enter the Fe 2 O 3 crystal lattice. The particle size of sample S_ (?) Is smaller than that of S_ (16) and the catalytic activity is better than that of S_ (16), but the content of γ_Fe_2O_3 in S_ (16) is more than 50% of S_ (? The main factor that caused S_ (?) To be more active than S_ (16) is that S_ (?) Sample has small particle size and large specific surface area. After five years, the superparamagnetic part of Mossbauer spectra of S _ (?) A samples increased obviously. This may be due to the fact that the unevenly distributed Cr 3+ ions in the S_ (?) Sample have a slow