Abstract A series of Ni-Ta catalysts supported on fibrous ZSM-5 were synthesized by microemulsion and impregnation method. Catalytic activity and selectivity were influenced by incorporation of Ta into Ni catalyst. The side reaction (Boudouard, methane cracking, and reverse water gas shift reaction) tests gave more insights on source of coking, where 10Ni catalyst was more inclined towards methane cracking. The 7Ni-3Ta catalyst showed the best performance (CO2 and CH4 conversions of 95% and 93%, respectively) due to the inherent activity of Ni, and anti-sintering impact of Ta as affirmed by TEM and Raman spectra. Its TGA analysis revealed 9.8% carbon content after 100 h. Furthermore, activation energy of CO2 and CH4 conversions were reduced by 15% and 10% respectively. Thus, addition of small amount of Ta to Ni catalyst was able to dilute Ni surface and limit the degree of graphitization of carbon which is prerequisite for stable performance in DRM.

中文翻译：

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Ni-Ta比例对纤维状Ni-Ta/ZSM-5甲烷干重整催化选择性的影响

摘要 采用微乳液浸渍法合成了一系列负载在纤维状ZSM-5上的Ni-Ta催化剂。催化活性和选择性受 Ta 掺入 Ni 催化剂的影响。副反应（Boudouard、甲烷裂解和逆水煤气变换反应）测试对焦化来源有更多的了解，其中 10Ni 催化剂更倾向于甲烷裂解。7Ni-3Ta 催化剂表现出最佳性能（CO2 和 CH4 转化率分别为 95% 和 93%），这是由于 Ni 的固有活性和 Ta 的抗烧结影响，如 TEM 和拉曼光谱所证实的。其 TGA 分析显示 100 小时后碳含量为 9.8%。此外，CO2 和 CH4 转化的活化能分别降低了 15% 和 10%。因此，