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采用原位合成技术制备出负载镍金属介孔氧化铝催化剂,同时采用过量浸渍法在已合成的有序介孔氧化铝和普通氧化铝上负载镍金属。采用BET、TEM、XRD、XPS、TPR、ICP-OES多种测试技术对3种催化剂结构特征、镍金属与载体的相互作用进行了表征,同时采用甲烷化反应验证3种催化剂的催化性能。实验结果表明,两种方法制备的负载镍金属介孔氧化铝催化剂相对于普通氧化铝结构稳定、孔径分布窄。原位合成的负载镍金属催化剂负载量大,镍金属与载体的相互作用力强。但金属的价态为难还原的偏铝酸镍,对甲烷化反应催化性能不高。过量浸渍法制备有序介孔氧化铝催化剂孔结构稳定,镍分散性好,价态以易还原的氧化镍为主,其催化性能要高于普通氧化铝,表明合成的有序介孔氧化铝在催化领域将具有重要的应用价值。
Nickel metal supported mesoporous alumina catalyst was prepared by in-situ synthesis technology, and nickel metal was loaded on the synthesized ordered mesoporous alumina and common alumina by means of excessive impregnation. The structures of three catalysts and the interaction between Ni metal and support were characterized by BET, TEM, XRD, XPS, TPR and ICP-OES. The catalytic performance of the three catalysts was also verified by methanation. The experimental results show that the supported nickel metal mesoporous alumina catalysts prepared by the two methods have stable pore structure and narrow pore size distribution compared with the common alumina. In-situ synthesis of supported nickel metal catalyst loading, nickel metal and support interaction. However, the metal is difficult to reduce the valence of nickel metatitanate, the catalytic performance of methanation is not high. The preparation of ordered mesoporous alumina by over impregnation method is characterized by stable pore structure, good nickel dispersibility and predominantly nickel oxide with easy valence reduction. Its catalytic performance is higher than that of common alumina, indicating that the synthesized ordered mesoporous alumina In the field of catalysis will have important application value.