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本文应用程序升温脱附和程序升温反应技术,对镍基催化剂上CO 的吸附和歧化及其同水的反应进行了研究。结果表明:随吸附温度的升高,(从120℃到300℃)CO 的解离吸附不断增加。400℃以上助剂中的氧参与了表面碳的氧化,在多层积碳的表面上,CO 仍然能够被吸附和进行歧化反应,表明表面碳可能代替镍起到CO吸附和反应的新的活性中心的作用。在高温陈化过的表面碳上,CO 吸附困难。CO与水的反应很可能是以表面碳做为反应中间体进行的。同水反应的表面碳有三种形态,其反应峰温分别为246℃、360—370℃和>550℃。520℃陈化后,前两种形态的表面碳失活严重,而后一种则比较稳定。
In this paper, temperature-programmed desorption and temperature-programmed reaction were used to study the adsorption and disproportionation of CO on Ni-based catalysts and their reaction with water. The results show that with the increase of adsorption temperature, the dissociative adsorption of CO increases from 120 ℃ to 300 ℃. Oxygen in the auxiliary above 400 ℃ is involved in the oxidation of surface carbon. On the surface of multi-layer carbon deposition, CO can still be adsorbed and disproportionation reaction, indicating that surface carbon may replace nickel for the new activity of CO adsorption and reaction The role of the center. CO adsorption is difficult at high temperature aged carbons. The reaction of CO with water is likely to be carried out using surface carbon as a reaction intermediate. The surface carbon reacted with water has three kinds of morphology, the peak reaction temperatures were 246 ℃, 360-370 ℃ and> 550 ℃. 520 ℃ aging, the first two forms of surface carbon deactivation serious, while the latter is more stable.