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本文应用脉冲色谱和红外光谱研究了镍基变换-甲烷化催化剂的H_2S中毒对CO和H_2O的 吸附、离解及反应的影响。观察到H_2S首先吸附在CO的桥式吸附中心上,并在体相形成镍同 硫的化合物。CO的线式吸附中心中毒较为缓慢。H_2S的饱和吸附使CO的歧化反应活性降 低,并使水的离解吸附停止进行。中毒的催化剂完全失去变换-甲烷化活性,但仍有一定的变 换反应和CO歧化反应活性。催化剂上表面炭的存在对H_2S中毒有一定的阻碍作用。
In this paper, the effects of H_2S poisoning on the adsorption and dissociation of CO and H_2O by Ni-based methanation catalysts were studied by pulse and infrared spectroscopy. It was observed that H 2 S first adsorbed on the bridge adsorption center of CO and formed a nickel-sulfur compound in the bulk phase. CO linear sorption center poisoning more slowly. Saturated adsorption of H 2 S reduced the activity of CO disproportionation reaction and stopped the dissociative adsorption of water. Poisoning catalyst completely lost shift - methanation activity, but there is still some conversion reaction and CO disproportionation activity. The presence of charcoal on the catalyst has a certain hindering effect on H 2 S poisoning.