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Microstructural transitions in camphene-based freeze casted ceria: effect of primary building blocks
Advances in Applied Ceramics ( IF 2.2 ) Pub Date : 2021-06-30 , DOI: 10.1080/17436753.2021.1945850
Raghunath Sharma Mukkavilli 1, 2 , Kousik Papakollu 1, 2 , Ravi Kumar 1, 2
Affiliation  

ABSTRACT

Porous ceria for high temperature catalytic applications demands structural integrity concomitant with sinter resistance and improved gas permeability. The current state of the art hinges on complex synthesis methodologies which are not only expensive but also lack flexibility in pore tailorability. Hence, the development of porous scaffolds through low-cost processes without compromising on the functionality is in order. Herein, we demonstrate porous ceria with an open porosity of 88% developed through camphene assisted freeze casting for the first time. Microstructural evolution with different building blocks – micrometre-sized particles and short fibres were also studied. Preliminary catalytic activity obtained via temperature programmed reduction exemplified similar profiles showing no effect of the initial building blocks on the activity.



中文翻译:

基于莰烯的冷冻铸造氧化铈的微观结构转变:主要构件的影响

摘要

用于高温催化应用的多孔氧化铈需要结构完整性、耐烧结性和改善的透气性。目前的技术水平取决于复杂的合成方法,这些方法不仅昂贵,而且在孔可定制性方面也缺乏灵活性。因此,在不影响功能的情况下,通过低成本工艺开发多孔支架是必要的。在此,我们首次展示了通过莰烯辅助冷冻铸造开发的具有 88% 开放孔隙率的多孔氧化铈。还研究了不同构建块的微观结构演变——微米大小的颗粒和短纤维。通过程序升温还原获得的初步催化活性举例说明了类似的曲线,表明初始构建块对活性没有影响。

更新日期:2021-08-05
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