抽放煤层气（CH4-CO2-Air）制合成气的研究——固溶体的形成对NiO/MgO催化剂性能的影响

采用浸渍法制备了NiO/MgO催化剂，用TPR、XRD、BET、H2(O2)化学吸附等技术对催化剂进行了表征，对催化剂在甲烷空气部分氧化与CO2重整耦合制合成气反应中的催化性能进行了评价。结果表明，在800 ℃焙烧的催化剂中，NiO完全与MgO形成NixMg1－xO固溶体。与低温焙烧的NiO/MgO催化剂相比，虽然NixMg1－xO固溶体催化剂的还原度较低，但可以获得较高的金属分散度和较小的金属粒径，能有效抑制积炭的生成，在反应过程中显示出良好的活性稳定性。对于900 ℃焙烧的催化剂，由于形成了更多难还原的体相固溶体，催化剂的初活性较低。

Study on the conversion of drained coal-bed methane to syngas—The effect of solid solution formation on the performance of Nio/MgO catalyst

The NiO/MgO catalysts were prepared by impregnation and calcination at different temperatures, and then were characterized by TPR, XRD, BET and Chemisorption techniques. The performance of NiO/MgO catalysts in coupling the partial oxidation of methane and CO2 reforming to prepare syngas was studied in a fixed-bed reactor. The results show that a solid-solution complex of NixMg1－xO is formed when NiO/MgO catalyst is calcined at 800 ℃. Although the complex catalyst exhibits low reducibility compared with the catalysts calcinated at low temperatures, a higher metal dispersion and a smaller Ni cluster size can be acquired. Because metallic Ni still remains strong interaction with MgO, the sintering of Ni is prevented. Thus, the carbon deposition is inhibited, which contributes to the high stability of the NixMg1－xO catalyst. While for the catalyst calcined at 900 ℃, low initial activity is exhibited due to the formation of much uniform bulk solid solution that is more difficult to be reduced to metallic Ni.