Role of A (A = Ca, Mg, Sr) over Hexaaluminates La0.8A0.2NiAl11O19 for Carbon Dioxide Reforming of Methane

Role of A (A = Ca, Mg, Sr) over Hexaaluminates La0.8A0.2NiAl11O19 for Carbon Dioxide Reforming of Methane

A study on hexaaluminates La0.8A0.2NiAl11O19 (A = Ca, Mg, Sr) as catalysts for CO2 reforming of CH4 was carried out by means of the XRD, TPR, TGA, XPS, and TEM techniques. It was found that the active Ni dispersion and Ni particle size depend strongly on the ionic radius of the alkaline earth metal...

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Veröffentlicht in:Industrial & engineering chemistry research 2011-10, Vol.50 (19), p.10955-10961
Hauptverfasser: Li, Jing, Wang, Dong, Zhou, Guangdong, Xue, Yingxue, Li, Chao, Cheng, Tiexin
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Applied sciences
Chemical engineering
Exact sciences and technology
Kinetics, Catalysis, and Reaction Engineering
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container_end_page 10961
container_issue 19
container_start_page 10955
container_title Industrial & engineering chemistry research
container_volume 50
creator Li, Jing
Wang, Dong
Zhou, Guangdong
Xue, Yingxue
Li, Chao
Cheng, Tiexin
description A study on hexaaluminates La0.8A0.2NiAl11O19 (A = Ca, Mg, Sr) as catalysts for CO2 reforming of CH4 was carried out by means of the XRD, TPR, TGA, XPS, and TEM techniques. It was found that the active Ni dispersion and Ni particle size depend strongly on the ionic radius of the alkaline earth metal (Ca, Mg, Sr). The ionic radius of Ca is less than that of La, and the difference between the ionic radii of Ca and La is lowest. The La0.8Ca0.2NiAl11O19 catalyst exhibited the highest activity compared to those of the other two catalysts, and it also showed a remarkably low carbon deposition. The presence of two types of carbon (deactivating encapsulating carbon and nondeactivating filamentous carbon) was observed by TEM. The filamentous carbon formed more easily over the La0.8Ca0.2NiAl11O19 catalyst.
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It was found that the active Ni dispersion and Ni particle size depend strongly on the ionic radius of the alkaline earth metal (Ca, Mg, Sr). The ionic radius of Ca is less than that of La, and the difference between the ionic radii of Ca and La is lowest. The La0.8Ca0.2NiAl11O19 catalyst exhibited the highest activity compared to those of the other two catalysts, and it also showed a remarkably low carbon deposition. The presence of two types of carbon (deactivating encapsulating carbon and nondeactivating filamentous carbon) was observed by TEM. 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title Role of A (A = Ca, Mg, Sr) over Hexaaluminates La0.8A0.2NiAl11O19 for Carbon Dioxide Reforming of Methane
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