通过X射线衍射、CO化学吸附、X射线光电子能谱和氨合成活性测试等手段,研究了Mg助剂对Ru/AC催化剂组分分布和活性的影响.结果显示,适量Mg的添加有利于Ba和金属Ru粒子在活性炭表面的均匀分布,从而提高了催化剂活性.
The effect of alkaline-earth oxides as promoters on Ru/AC (AC = activated carbon) catalysts was explored. Alkaline-earth metal oxides can reduce the agglomeration of ruthenium particles at high temperatures, which increases the amount of available ruthenium. The influence of the Mg promoter on the distribution and activity of the Ru/AC catalyst were investigated by CO chemisorption, X-ray diffraction, and energy dispersive spectrometry and by an activity test for ammonia synthesis. The results show that a specific quantity of magnesium significantly promotes the uniform distribution of Ba and Ru on the surface of AC, which enhances catalytic activity. The introduction of Mg significantly improved the size of the Ru particles and increased the Ru surface area. The distribution and interaction were improved greatly for the Ba promoter and the Ru precursor on the surface of the AC because of the addition of the Mg promoter. The introduction of magnesium to Ru-Ba-K/AC significantly improved the utilization ratio of the noble metals and the performance-price ratio.
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