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Ni-Based Catalysts for Low Temperature Methane Steam Reforming: Recent Results on Ni-Au and Comparison with Other Bi-Metallic Systems

机译:用于低温甲烷蒸汽重整的镍基催化剂:Ni-​​Au的最新结果以及与其他双金属系统的比较

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摘要

Steam reforming of light hydrocarbons provides a promising method for hydrogen production. Ni-based catalysts are so far the best and the most commonly used catalysts for steam reforming because of their acceptably high activity and significantly lower cost in comparison with alternative precious metal-based catalysts. However, nickel catalysts are susceptible to deactivation from the deposition of carbon, even when operating at steam-to-carbon ratios predicted to be thermodynamically outside of the carbon-forming regime. Reactivity and deactivation by carbon formation can be tuned by modifying Ni surfaces with a second metal, such as Au through alloy formation. In the present review, we summarize the very recent progress in the design, synthesis, and characterization of supported bimetallic Ni-based catalysts for steam reforming. The progress in the modification of Ni with noble metals (such as Au and Ag) is discussed in terms of preparation, characterization and pretreatment methods. Moreover, the comparison with the effects of other metals (such as Sn, Cu, Co, Mo, Fe, Gd and B) is addressed. The differences of catalytic activity, thermal stability and carbon species between bimetallic and monometallic Ni-based catalysts are also briefly shown.
机译:轻烃的蒸汽重整为制氢提供了一种有希望的方法。到目前为止,镍基催化剂是蒸汽重整的最佳和最常用的催化剂,因为与替代的贵金属基催化剂相比,它们具有可接受的高活性和显着降低的成本。然而,镍催化剂即使在以热力学比被预测为在碳形成机制之外热力学的蒸汽-碳比下操作时,也易于因碳沉积而失活。通过碳形成的反应性和失活可以通过用第二金属(例如金)通过合金形成来修饰Ni表面来调节。在本综述中,我们总结了用于蒸汽重整的负载型双金属镍基催化剂的设计,合成和表征的最新进展。从制备,表征和预处理方法等方面讨论了用贵金属(例如金和银)修饰镍的进展。此外,解决了与其他金属(如锡,铜,钴,钼,铁,金和硼)的影响的比较。还简要显示了双金属和单金属镍基催化剂之间的催化活性,热稳定性和碳种类的差异。

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