甲烷化
镍
化学
催化作用
一氧化碳
粒径
扩散
粒子(生态学)
分压
无机化学
分解
化学工程
热力学
物理化学
有机化学
氧气
海洋学
工程类
地质学
物理
标识
DOI:10.1016/0021-9517(81)90048-8
摘要
The loss of methanation activity of alumina-supported nickel catalysts was investigated at pressures up to ca. 600 kPa and temperatures from 400 to 740 K. Deactivation is attributed primarily to growth in nickel particle size. A mechanism involving Ni(CO)4 formation, diffusion and subsequent decomposition is proposed to explain the observed growth in nickel particle size. A region of “safe” operating conditions for achieving stable catalytic activity for methanation was identified. These safe operating conditions were sensitive to temperature and carbon monoxide partial pressure. A criterion based on the equilibrium partial pressure of Ni(CO)4 is proposed for assessing the safety of a set of operating conditions. Specifically, conditions for which the equilibrium Ni(CO)4 pressure is less than ca. 1 × 10−6 Pa result in stable methanation activity.
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