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Flame spray pyrolysis-designed silica/ceria-zirconia supports for the carbon dioxide reforming of methane
Applied Catalysis A: General ( IF 5.5 ) Pub Date : 2017-08-09 , DOI: 10.1016/j.apcata.2017.08.002
Emma C. Lovell , Jonathan Horlyck , Jason Scott , Rose Amal

Flame spray pyrolysis (FSP) was used to design silica/ceria-zirconia particles with assorted structures as Ni catalyst supports for the carbon dioxide reforming of methane. The FSP precursor feed was varied to produce either mixed-oxide or core-shell arrays. The structures exhibited diversity in their properties including surface area and oxygen storage capacity. NiO deposit size decreased with increasing ceria-zirconia content, from 14 nm for the neat SiO2 to 5 nm for the neat Ce0.7Zr0.3O2. Compared to the neat supports, the co-operative benefits of coupling the silica with the ceria-zirconia were clear. Introducing ceria-zirconia to the silica enabled the mixed supports to outperform the neat silica by supressing methane decomposition and promoting the dry reforming reaction. Introducing silica to the ceria-zirconia enabled the mixed supports to outperform the neat ceria-zirconia by decreasing susceptibility toward the reverse water gas shift reaction and preventing deactivation at 700 °C, attributed to better support thermal stability.



中文翻译:

火焰喷雾热解设计的二氧化硅/氧化铈-氧化锆载体,用于甲烷的二氧化碳重整

火焰喷雾热解法(FSP)用于设计具有各种结构的二氧化硅/二氧化铈-氧化锆颗粒,作为Ni催化剂载体用于甲烷的二氧化碳重整。改变FSP前体进料以产生混合氧化物或核-壳阵列。该结构在其性质包括表面积和储氧能力方面表现出多样性。NiO沉积物的尺寸随着二氧化铈和氧化锆含量的增加而减小,从纯SiO 2的14 nm降至纯Ce 0.7 Zr 0.3 O 2的5 nm。。与纯载体相比,将二氧化硅与二氧化铈-氧化锆偶联的合作优势显而易见。向二氧化硅中引入二氧化铈-氧化锆可阻止甲烷分解并促进干重整反应,从而使混合载体的性能优于纯二氧化硅。向二氧化铈-氧化锆中引入二氧化硅可使混合载体通过降低对逆水煤气变换反应的敏感性并防止在700°C下失活而胜过纯二氧化铈-氧化锆,这归因于更好的载体热稳定性。

更新日期:2017-08-09
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