工业低镍催化剂上天然气-CO_2-水蒸气和氧气转化制备合成气的研究

假设密置单层排布模型 ,在理论上探讨了高温、高压下低镍催化剂应用的可行性。并采用低比表面积工业α Al2 O3 载体 ,经CeO2 和MgO改性研制工业低镍HSD - 2催化剂。HSD - 2催化剂在 112 3K、1.0MPa下 ,与天然气、氧气、二氧化碳、水蒸气转化制合成气反应体系在n(naturalgas)∶n(CO2 )∶n(O2 )∶n(H2 O) =1∶0 .1∶0 .3∶1.3 ,空速为GHSV =1182 2h 1条件下连续反应 12 5h ,CH4 转化率始终保持在 90 %～ 94% ,H2 的选择性为 94%～ 96 %左右。较相同镍含量的Ni/α Al2 O3 催化剂活性高 ,稳定性和抗积炭性强

A study on the reforming of natural gas with steam, oxygen and carbon dioxide to syngas over industrial catalysts supported lower nickel

The model is supposed that Ni 2O 3 covers the Al 2O 3 surface in close monolayer dispersion, by which the feasibility of the reforming reaction at high temperature and pressure is discussed theoretically. As the support with lower BET surface area being used, the catalyst promoted by MgO and CeO 2 at lower nickel contents is prepared. The catalyst is labeled as HSD-2. The stability is tested under conditions of 1123K,1 0MPa and the ratio of feed- n ( natural gas)∶ n (CO 2)∶(O 2)∶ n (H 2O)=1∶0 1∶0 3∶1 3(mole ratio), GHSV=11822h -1 .CH 4 conversion over HSD-2 catalyst is kept at around 90%～94% during 125h, and the selectivity of H 2 is about 94%～96%. Compared with the Ni/α-Al 2O 3 loaded same the amount of nickel, the HSD-2 catalyst has not only high activity, but also high stability and good resistance to carbon deposition.