Oxidative coupling of methane on improved bismuth oxide membrane reactors
Oxidative coupling of methane on improved bismuth oxide membrane reactors
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DOI：
10.1002/aic.690470220
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发表时间：
2001-02
期刊：
影响因子：
3.7
通讯作者：
Y. Zeng;Y. S. Lin
中科院分区：
文献类型：
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作者：
Y. Zeng;Y. S. Lin
通过在晶格中掺入Sm，制备了具有较高化学稳定性的萤石结构Yuria-By氧化物薄膜。掺Sm的Yuria-Bimuth氧化物(BYS)薄膜为萤石结构，具有较高的透氧率和良好的甲烷氧化偶联(OCM)催化性能。氧渗透亚麻的氧分压依赖关系表明，随着温度从750℃升高到950℃，限速步骤从表面反应向巨型电子空穴传导转移。含Merhane和含氧流被送入BYS膜的对侧，以便在暴露在甲烷中的膜表面发生OCM反应。膜反应器中C2的产率为4-11%，C2的选择性高达74%。该膜反应器的性能与BYS膜的透氧性能密切相关。实验结果表明，增大膜表面积与反应器体积比可以有效地提高C2的产率。在这种盘状膜反应器中，C2的最高产率为17%，C2的选择性约为80%。
Fluorite-structured yuria-bismuth oxide membranes with improved chemical stability were prepared by doping samarium in the lattice. The samarium-doped yuria-bismuth oxide (BYS) membranes are in fluorite structure, with high oxygen permeability and good catalytic properties for oxidative coupling of methane (OCM). The oxygen partial pressure dependence of oxygen permeation flax shows a shift of the rate-limiting step from the suface reaction to the hulk electron-hole conduction as temperature increases from 750 to 950°C. OCM reactions were conducted in a membrane reactor made of the disk-shaped BYS membrane. Merhane- and oxygen-containing streams are fed into the opposite sides of the BYS membrane to allow OCM reactions to occur on the membrane surface exposed to methane. The membrane reactor gives C2, yields of 4–11% with C2, selectivity up to 74%. The performance of this membrane reactor is closely related to oxygen permeation properties of the BYS membrane. Experimental results show the effectiveness in improving the C2 yield by increasing the membrane surface area to reactor volume ratio. In this disk-shaped membrane reactor the highest C2, yield achieved is 17%, with a C2 selectivity of about 80%.