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首页> 外文期刊>Catalysis science & technology >Construction of a hollow structure in La0.9K0.1CoO3-delta nanofibers via grain size control by Sr substitution with an enhanced catalytic performance for soot removal
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Construction of a hollow structure in La0.9K0.1CoO3-delta nanofibers via grain size control by Sr substitution with an enhanced catalytic performance for soot removal

机译：中空结构的建设通过粒度La0.9K0.1CoO3-delta纳米纤维通过老替换一个增强的控制催化性能的烟尘去除

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摘要

Perovskite-type La0.9K0.1CoO3-delta nanofibers were fabricated successfully using an electrospinning technique with calcination, based on the successful preparation of LaCoO3 nanofibers considering the enhancement in the activity by K+, which could facilitate oxygen species transfer and accelerate redox circulation. Furthermore, a hollow structure could provide more pathways for soot transportation and transmission of reaction gas (O-2 and NO), improving the contact efficiency of soot-catalyst-gas and contributing to the enhancement in catalytic activity. However, the grain size increasing in the calcination has a great influence on the formation of the hollow structure. Thence, the introduction of some Sr2+ in La0.9K0.1CoO3-delta nanofibers was taken into consideration to construct the hollow structure, by the inhibition of grain growth during heat treatment at a high temperature. Meanwhile, the Sr2+ doping could further promote the catalytic activity. After comparison, an appropriate amount of Sr2+ was introduced and the perovskite-type La0.63Sr0.27K0.1CoO3-delta nanotubes were successfully prepared in this work as a result. Besides, some related catalysts were also prepared for comparison with the same method. These as-prepared catalysts were investigated by a series of characterization techniques. The activity evaluation of the catalysts was carried out through temperature programmed oxidation in 5% O-2 and 2000 ppm NO, as well as in the presence of 6% H2O. According to the activity data, La0.63Sr0.27K0.1CoO3-delta nanotubes could be recognized as a high-performance catalyst for soot oxidation.
机译：Perovskite-type La0.9K0.1CoO3-delta纳米纤维成功的使用电纺的技术与煅烧,基础在成功制备LaCoO3纳米纤维考虑的增强通过K +活动,这可以促进氧气物种转移和加速氧化还原循环。可以提供更多的途径对烟尘运输和反应气体的传播(0 2,没有),改善的接触效率soot-catalyst-gas和贡献在催化活性增强。晶粒尺寸增加在煅烧大影响的形成空洞结构。在La0.9K0.1CoO3-delta纳米纤维被带进考虑构建空心结构,在热的抑制晶粒生长高温处理。Sr2 +掺杂可能会进一步促进催化活动。介绍了Sr2 + perovskite-typeLa0.63Sr0.27K0.1CoO3-delta纳米管是结果成功地准备这项工作。此外,一些相关的催化剂也准备与相同的方法进行比较。这些好了催化剂是调查一系列的表征技术。催化剂进行评价的活动通过程序升温氧化0 2 5%和2000 ppm,以及6%的水的存在。数据,La0.63Sr0.27K0.1CoO3-delta纳米管被认为是一个高性能的催化剂烟尘氧化。

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