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首页> 外文期刊>Catalysis science & technology >Elucidating the promotional effects of niobia on SnO2 for CO oxidation: developing an XRD extrapolation method to measure the lattice capacity of solid solutions
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Elucidating the promotional effects of niobia on SnO2 for CO oxidation: developing an XRD extrapolation method to measure the lattice capacity of solid solutions

机译：阐明niobia的促销效果SnO2 CO氧化:开发一个x射线衍射外推法来测量晶格坚实的解决方案的能力

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摘要

A series of Sn-Nb binary catalysts have been prepared by using a co-precipitation method and used for CO oxidation. All the catalysts show much higher specific surface areas than the individual oxides, indicating their improved thermal stability. It was found that Nb5+ cations can be doped into the lattice of tetragonal rutile SnO2 to replace a portion of the Sn4+ to form a solid solution structure. Using an XRD extrapolation method, the SnO2 lattice capacity for Nb2O5 has been quantified, which proves that only 25% of the Sn4+ in the SnO2 lattice can be replaced by Nb5+ to form a stable solid solution. For the samples with Nb contents below the capacity, the formed solid solution structure can induce the formation of a large quantity of stable and active surface deficient oxygen species due to charge imbalance and lattice defects, which improve the CO oxidation activity remarkably. For the samples with Nb contents above the capacity, the excess Nb is present as free Nb2O5 in the catalysts, which is harmful to their activity. It is concluded that Nb, as an effective promoter for SnO2, must be incorporated into its lattice as Nb5+ to form a solid solution. A Sn-Nb solid solution without excess Nb2O5 is not only a promising catalyst itself, but also a good support for precious metals to prepare catalysts for CO oxidation.
机译：一系列Sn-Nb二元催化剂通过使用一个共同沉淀方法和准备用于CO氧化。更高的比表面积比区域个人氧化物,显示他们的改善热稳定性。可以掺杂正方晶格的金红石SnO2取代Sn4 +的一部分形成固溶体结构。外推法,SnO2晶格的能力对Nb2O5量化,这证明只有25%的Sn4 + SnO2晶格取而代之的是Nb5 +形成一个稳定的固溶体。以下为样品Nb内容能力,可以形成固溶体结构引起大量的形成稳定和活跃的表面缺乏氧气物种由于电荷不平衡和晶格缺陷,提高CO氧化活性值得注意的是。以上能力,存在过剩Nb免费Nb2O5催化剂,这是有害的他们的活动。有效的启动子SnO2,必须被整合为其晶格Nb5 +形成固体解决方案。Nb2O5不仅是一种很有前途的催化剂本身,还好支持贵金属准备CO氧化催化剂。

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