Methane is decomposed to carbon and hydrogen over Raney nickel catalyst in controlled manner in order to deposit carbon; and thereby NiC composite catalysts have been prepared. The catalysts have been analyzed by atomic emission spectroscopy, X-ray photoelectron spectroscopy and X-ray diffraction. The NiC catalysts are comprised of metallic nickel with superficial oxide and carbon. Electron density of Ni in the NiC catalysts is observed to be higher than that in the parent Raney nickel; this indicate partial charge transfer from carbon to nickel in the NiC catalysts. The NiC catalysts exhibite much better performance than the original Raney nickel catalyst in the selective hydrogenation of cinnamaldehyde to hydrocinnamaldehyde. They also exhibite stable performance in multiple reaction runs.

中文翻译：

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镍碳复合催化剂上肉桂醛选择性加氢制氢化肉桂醛

甲烷在雷尼镍催化剂上以受控方式分解为碳和氢以沉积碳；从而制备了NiC复合催化剂。通过原子发射光谱、X 射线光电子能谱和 X 射线衍射对催化剂进行了分析。NiC 催化剂由金属镍和表面氧化物和碳组成。观察到 NiC 催化剂中 Ni 的电子密度高于母体 Raney 镍；这表明在 NiC 催化剂中部分电荷从碳转移到镍。NiC催化剂在肉桂醛选择性氢化成氢化肉桂醛方面表现出比原Raney镍催化剂好得多的性能。它们还在多次反应运行中表现出稳定的性能。