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| ZSM-5沸石中V的还原性能 | |
| 引用本文： | 张春雷 吴志芸. ZSM-5沸石中V的还原性能[J]. 高等学校化学学报, 1994, 15(11): 1670-1674 |
| 作者姓名： | 张春雷 吴志芸 |
| 作者单位： | 吉林大学化学系, 长春, 130023 |
| 摘 要： | 用TPR并结合XRD、ESR和XPS等测试手段研究了V(Ⅳ,Ⅴ)-ZSM-5、V2O5-/ZSM-5(分别用浸渍法和机械混合法制备)及V2O5样品的还原性能,获得了还原过程中物相及钒离子价态变化的信息,发现分散在分子筛表面上的V(Ⅴ)还原温度比V2O5低,而位于ZSM-5骨架上的V(Ⅴ)却比V2O5更难还原。高于1200K骨架V才开始还原；高于1370K,V-ZSM-5分子筛开始解体并转变成方英石结构,从骨架中析出的V完全还原成低价态。 |
| 关 键 词： | V－ZSM－5 TPR ESR 钒价态 |
| 收稿时间： | 1993-11-06 |
Reducibility of Vanadium in Zeolite ZSM-5 |
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| ZHANG Chun-Lei,WU Zhi-Yun. Reducibility of Vanadium in Zeolite ZSM-5[J]. Chemical Research In Chinese Universities, 1994, 15(11): 1670-1674 | |
| Authors: | ZHANG Chun-Lei WU Zhi-Yun |
| Affiliation: | Department of Chemistry, Jilin University, Changchun, 130023 |
| Abstract: | The reducibility of V(Ⅳ, )-ZSM-5 and V2O5/ZSM-5(preapred by impregnation (Method I) and mechanical mixing(Method Ⅱ), respectivitly) was studied by TPR, XRD, ESRand XPStechniques, Some singificant information about phase changes during the reduction was obtained. It was found that the reduction temperature of V(v)dispersed on the surface of zeolite was lower than that of V2O5. However, V(v)in the lattice of ZSM-5 was more difficult to be reduced; Its reduction temperature is over l200 K. When the temperature was raised to or over 1370 K, V-ZSM-5 was converted into christobalite-structured phase, In this state, V(v)separated form the frameworks was completely reduced to the lower valence. |
| Keywords: | V-ZSM-5 TPR ESR Valence state of vanadium |
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