介孔氧化铁用于一氧化碳的消除_刘强
07-I-215
介孔氧化铁用于一氧化碳的消除 刘 强，崔志民，宋卫国，万立骏
中国科学院化学研究所，100080，北京
Email: [email protected]
摘要：无氧环境下一氧化碳的消除在燃料电池与金属催化领域有着重要意义。一氧化碳歧化可以实现这个目标。在本项研究中，我们合成了四种不同形貌的氧化铁催化剂用于催化一氧化碳的歧化。这四种氧化铁分别是介孔氧化铁、两种大小的纳米氧化铁颗粒以及负载在氧化硅上的氧化铁。我们通过比表面积与晶体结构计算得到这些催化剂的等效颗粒大小值，发现催化剂的催化性能与他们的等效颗粒大小值密切相关。介孔氧化硅的等效颗粒大小值最小，一氧化碳歧化的催化活性也最高。同时我们探讨了一氧化碳浓度、水的存在、催化剂积碳失活与再生等因素对催化体系的影响。
关键词：一氧化碳，氧化铁、歧化、催化、纳米
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Removal of CO using Iron Oxides
Qiang Liu, Zhi-Min Cui†, Wei-Guo Song* and Li-Jun Wan*
Beijing Laboratory for Molecular Sciences (BNLMS),
Institute of Chemistry, the Chinese Academy of Sciences, Beijing, 100080, P. R. China.
Abstract：To remove CO without oxygen is important in fuel cell and metal catalyzed reactions. CO disproportionation is an ideal way to achieve this goal. We synthesized four iron oxide catalysts with different morphologies and tested their activities in CO disproportionations. These four iron oxides are mesoporous, two nano sized iron oxide spheres and silica supported iron oxide. Hypothetical Equivalent Average Particle Size (EAPS), which was calculated from surface area and unit cell parameter of particles with irregular morphologies, was used to evaluate the catalytic activities of the iron oxides. We observed size effect (EAPS effect) from these iron oxides. CO disproportionation test results showed that mesoporous iron oxide was most active due to its smallest EAPS. Effects of CO concentration, presence of water, catalyst coking and regeneration were also discussed.