Partial oxidation reactions of CH₄ over monometallic Ni, Rh, Re and bimetallic Re-Ni catalysts supported by Al₂O₃ were studied at 400–700 °C. Among monometallic catalysts, Rh/Al₂O₃ exhibited the highest catalytic activity. Lower CH₄ conversion and H₂ yield were observed over Ni/Al₂O₃ catalyst, while Re/Al₂O₃ catalyst did not promote the reaction under the studied condition. Addition of Re over Ni to form a bimetallic catalyst considerably promoted the activity of Ni/Al₂O₃ catalyst, particularly at a higher temperature (600 °C). Re-Ni proportion was then optimized; Re-Ni/Al₂O₃ at Re:Ni ratio of 3:7 resulted in a significantly higher CH₄ conversion as well as H₂ and CO yields when compared to noble-metal Rh/Al₂O₃ catalyst. Stability testing of Re-Ni/Al₂O₃, Ni/Al₂O₃ and Rh/Al₂O₃ catalysts was also conducted. After 18-h operation, Re-Ni/Al₂O₃ catalyst still exhibited high stability with slight deactivation in terms of H₂ yield, whereas Ni/Al₂O₃ and Rh/Al₂O₃ catalysts showed higher deactivation rates. Post-reaction temperature programmed oxidation confirmed the better resistance toward carbon deposition of Re-Ni/Al₂O₃ catalyst. The effect of steam and CO₂ addition on the Re-Ni/Al₂O₃ catalyst performance was also investigated. The presence of a suitable H₂O content could increase H₂ and CO yields and reduce the amount of carbon deposition, whereas the presence of CO₂ showed undesirable influence on the reaction by reducing CH₄ conversion and H₂/CO ratio. Lastly, Re-Ni/Gd-CeO₂ catalyst was prepared and tested to study the effect of catalyst support. The catalyst stability and resistance toward carbon deposition were significantly improved, which could be due to the high oxygen storage capacity of Gd-CeO₂.

研究了在400–700°C下，由Al ₂ O ₃负载的单金属Ni，Rh，Re和双金属Re-Ni催化剂上CH _4的部分氧化反应。在单金属催化剂中，Rh / Al ₂ O ₃表现出最高的催化活性。在研究条件下，Ni / Al ₂ O ₃催化剂的CH ₄转化率和H ₂产率较低，而Re / Al ₂ O ₃催化剂没有促进反应。在Ni上添加Re形成双金属催化剂大大提高了Ni / Al ₂ O ₃的活性催化剂，尤其是在较高温度（600°C）下。然后优化了Re-Ni的比例。与贵金属Rh / Al ₂ O ₃催化剂相比，Re：Ni比为3：7的Re-Ni / Al ₂ O ₃导致CH ₄转化率以及H ₂和CO产率显着提高。还进行了Re-Ni / Al ₂ O ₃，Ni / Al ₂ O ₃和Rh / Al ₂ O ₃催化剂的稳定性测试。在运行18小时后，Re-Ni / Al ₂ O ₃催化剂仍表现出高稳定性，并且在H ₂方面略有失活Ni / Al ₂ O ₃和Rh / Al ₂ O ₃催化剂显示出更高的失活速率。反应后温度程序控制的氧化证实了Re-Ni / Al ₂ O ₃催化剂对碳沉积具有更好的抵抗力。还研究了蒸汽和CO ₂添加对Re-Ni / Al ₂ O ₃催化剂性能的影响。合适的H ₂ O含量的存在可以提高H ₂和CO的收率并减少碳沉积的量，而CO ₂的存在通过减少CH ₄表现出对反应的不良影响转化率和H ₂ / CO比。最后，制备了Re-Ni / Gd-CeO ₂催化剂并进行了测试，以研究催化剂载体的作用。由于Gd-CeO ₂的高储氧能力，催化剂的稳定性和抗碳沉积性得到了显着提高。