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在原位条件下测定了四种Pt-Sn/r-Al_2O_3脱氫催化剂在还原后和经4小时反应,8小时催寿后的穆斯堡尔谱。确定了不同催化剂在上述条件下各种锡物类的谱参数和相对含量,探讨了催化过程中锡的价态变化和催化剂中锡组份的作用。
The Mossbauer spectra of four Pt-Sn / r-Al 2 O 3 dehydrogenation catalysts were measured after in-situ reduction and after 4 hours of reaction, and after 8 hours of residence time. The spectral parameters and relative contents of various tin species under different conditions were determined. The change of valence state of tin and the effect of tin component in the catalyst were discussed.