Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6634497 | Fuel | 2015 | 10 Pages |
Abstract
A series of supported Ni/Mg/Al catalysts with Ni loadings of 3-18Â wt% were prepared from Ni-Mg-Al layered double hydroxides and tested for the CH4-CO2 reforming. The influence of Ni loading on the catalyst activity and stability was studied. It is found that the catalyst activity increased with increasing the Ni loading. However, the CO disproportionation became significant as the Ni loading increased. The long-term stability of the Ni/Mg/Al catalysts was influenced by the Ni loading as well as the reaction temperature. At a high temperature of 1023Â K, the catalyst stability increased with increasing the Ni loading, whereas it decreased with increasing the Ni loading at a low temperature of 873Â K. The characterization on the spent Ni/Mg/Al catalysts showed that the sintering of Ni metal particles increased with increasing the Ni loading, and it became more severe at 873Â K than at 1023Â K. On the other hand, the coke deposition at 1023Â K tended to decrease with increasing the Ni loading, and an opposite tendency was observed at 873Â K. The coke deposition particularly the encapsulating carbon was considered to be responsible for the catalyst deactivation. A Ni loading of 12Â wt% would be suitable for the Ni/Mg/Al catalyst considering its high activity, good stability, and less coke deposition at high temperature.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Xingyi Lin, Rule Li, Miaomiao Lu, Chongqi Chen, Dalin Li, Yingying Zhan, Lilong Jiang,