氮化氧化铈负载镍基催化剂催化甲烷二氧化碳重整反应性能研究

Catalytic performance of nickel catalysts supported on N-CeO_(2)for carbon dioxide reforming of methane

水热法合成的棒状CeO_(2)载体(CeO_(2)-R)经过高温NH_(3)氮化,得到了氮化的CeO_(2)载体(N-CeO_(2)-R).采用满孔浸渍法浸渍活性金属Ni,通过XRD、TEM、XPS和H_(2)-TPR等表征手段,研究了载体及催化剂结构.结果表明:棒状CeO_(2)载体在氮化前后,其形貌基本保持不变,同时载体中部分O原子被N原子取代,H2-TPR数据表明氮化后的载体与活性金属之间的相互作用力较强,不会阻碍载体表面与CO_(2)相互接触,能够有效抑制催化剂因活性位点被覆盖而失活,进一步提高了催化剂的催化活性.

Rod-shaped CeO_(2) supports(CeO_(2)-R)synthesized by hydrothermal method were nitrided by NH_(3) at high temperature(denoted as N-CeO_(2)-R).Ni was impregnated by full hole volume impregnation method and the structure of supports and catalysts were characterized by XRD,TEM,XPS and H_(2)-TPR.The results showed that the morphology of the catalysts remained unchanged after nitriding treatment,and some oxygen atoms in the supports were replaced by nitrogen atoms.H_(2)-TPR data showed that the interaction between N-CeO_(2)-R supports and nickel was stronger than that between CeO_(2)-R supports and nickel,thus would not hinder the contact between the support surface and CO_(2),and may effectively inhibit the deactivation of the catalyst by preventing the occupation of active sites,and further improve the activity of the catalysts.