Reforming and cracking of CH 4 over Al 2 O 3 supported Ni, Ni-Fe and Ni-Co catalysts

催化作用 开裂 二氧化碳重整 合金 金属 甲烷 材料科学 化学工程 冶金 化学 无机化学 合成气 有机化学 复合材料 工程类
作者
K.K. Ray,Samik Sengupta,Goutam Deo
出处
期刊:Fuel Processing Technology [Elsevier]
卷期号:156: 195-203 被引量:72
标识
DOI:10.1016/j.fuproc.2016.11.003
摘要

Supported Ni, Ni-Fe and Fe catalysts of the same total metal loading and different Ni to Fe ratios were studied for the dry reforming and cracking of methane (CH4). The supported Ni-Fe catalysts containing Ni and Fe in the ratio of 3:1 (75Ni25Fe/Al2O3) was the most active for both reactions and was slightly more active than the supported Ni catalyst. The same Ni to Co ratio of 3:1 was present in the most active Ni-Co catalyst (75Ni25Co/Al2O3). Characterization of 75Ni25Fe/Al2O3 revealed the formation of Ni3Fe alloy, whose surface properties were different from the Ni1-xCox alloy present in 75Ni25Co/Al2O3. The presence of Ni based alloys of specific composition seemed responsible for the enhanced activity of 75Ni25Fe/Al2O3 and 75Ni25Co/Al2O3 relative to supported Ni catalyst for both the reactions. Furthermore, 75Ni25Co/Al2O3 was the most active catalyst for both reactions though deactivation occurred. In contrast, lower deactivation occurred with 75Ni25Fe/Al2O3. The turnover frequency during reforming and cracking were closely related for the supported Ni, Ni-Fe and Ni-Co catalysts. The higher activity of the 75Ni25Co/Al2O3 for the dry reforming reaction appeared to be due to the higher turnover frequency of this catalyst for the cracking reaction. Thus, the formation of alloys with specific composition, which improved the CH4 cracking capability, seems to be the key factor for determining the best catalytic performance for the reforming reaction over the promoted Ni catalysts.
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