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| Fe2O3MoO3Sb2O3体系中，在进行热处理之前对混合物的研磨有助于氧化锑的分散。300 ℃表面已明显观察到Sb2O3对Fe2O3和MoO3的固态润湿现象。400 ℃时三氧化二锑开始氧化为四氧化二锑，同时Sb2O3对Fe2O3和MoO3的固态润湿急剧增强，直到500 ℃时，Sb2O3被完全氧化。由于Sb2O3具有极强的润湿效果，MoO3的表面由于被Sb2O3包覆，难以再对Fe2O3表面进行固态润湿，同时也妨碍了Fe2O3和MoO3的固相反应生成Fe2(MoO4)3，将其开始生成的温度几乎提高了300 ℃（即700 ℃）。伴随着Fe2(MoO4)3的形成，FeSbO4物相出现，这比Sb2O3对Fe2O3双组分体系中FeSbO4的生成温度降低了约100 ℃，这是由于Fe2(MoO4)3对FeSbO4的生成起到了催化作用。甲醇选择氧化反应表明：Sb2O3和Sb2O4的固态润湿现象对FeMoO催化剂具有显著的“中毒”效应。 |
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不知能否满足要求。 Milling mixture is benefit for the dispersion of Sb2O3 before heat treatment in the reaction system of Sb2O3MoO3Fe2O3. it is obviously observed that Sb2O3 solid wets Fe2O3 and MoO3 at 300℃. Sb2O3 is oxidized into sb204 at 400℃, and the solid wetting of Sb2O3 to Fe2O3 and MoO3 increases simultaneously until Sb2O3 is fully oxidized at 500℃. MoO3 is coated by Sb2O3 due to strong wetting effect of Sb2O3, and it can not wet Fe2O3. the solid reaction into Fe2(MoO4)3 between Fe2O3 and MoO3 is also impeded, and the initial reaction temperature rises by 300℃ (i.e. 700℃). FeSbO4 phase occurs with the formation of Fe2(MoO4)3.It indicates that the formation temperature of FeSbO4 while Fe2(MoO4)3 exists is lower by 100℃ than that in the dual –component reaction system of Sb2O3 and Fe2O3 due to the catalysis effect of Fe2(MoO4)3 to FeSbO4. carbinol selective oxidization reaction shows that the solid wetting of Sb2O3 and Sb2O4 has a significant poisonous effect on the catalyst of FeO. |
4楼2008-06-05 22:18:14
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2楼2008-06-05 21:41:34
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liconglin970410(金币+8,VIP+0):谢谢，积极参与
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400 ℃时三氧化二锑开始氧化为四氧化二锑，同时Sb2O3对Fe2O3和MoO3的固态润湿急剧增强，直到500 ℃时，Sb2O3被完全氧化。由于Sb2O3具有极强的润湿效果，MoO3的表面由于被Sb2O3包覆，难以再对Fe2O3表面进行固态润湿，同时也妨碍了Fe2O3和MoO3的固相反应生成Fe2(MoO4)3，将其开始生成的温度几乎提高了300 ℃（即700 ℃）。伴随着Fe2(MoO4)3的形成，FeSbO4物相出现，这比Sb2O3对Fe2O3双组分体系中FeSbO4的生成温度降低了约100 ℃，这是由于Fe2(MoO4)3对FeSbO4的生成起到了催化作用。甲醇选择氧化反应表明：Sb2O3和Sb2O4的固态润湿现象对FeMoO催化剂具有显著的“中毒”效应。 At 400 ℃ , trioxide two stibium start to oxidize for the tetroxide two stibium, simultaneously Sb2O3 moist strengthens suddenly to Fe2O3 and the MoO3 solid state, until 500 ℃, Sb2O3 is oxidized completely. Because Sb2O3 has the greatly strengthened moist effect, the MoO3 surface as a result of by the Sb2O3 gable, is carried on to the Fe2O3 surface the solid state to be moist again with difficulty, simultaneously has also hindered Fe2O3 and the MoO3 solid phase responds produces Fe2(MoO4)3, started the temperature which it produced to enhance nearly 300 ℃ (i.e. 700 ℃). Follows the Fe2(MoO4)3 formation, the FeSbO4 phase is appearing, this was the FeSbO4 production temperature reduced compared to Sb2O3 to the Fe2O3 two-group fission approximately 100 ℃, this was as a result of Fe2(MoO4)3 to the FeSbO4 production catalytic effect. The methyl alcohol selective oxidation response indicated: Sb2O3 and the Sb2O4 solid state moist phenomenon catalyst has “the poison” obviously to Fe Mo the O the effect. |
3楼2008-06-05 21:44:42
5楼2008-06-06 08:24:34