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本文用X射线粉末线条宽化法(XRD)测定低镍型甲烷化催化剂中镍的平均粒度,发现以γ—Al_2O_3为载体的浸渍型镍催化剂,随镧La含量的增加,活性物质镍晶粒的平均粒度依次变小(在一定La含量范围内),变化幅度比前人以SiO_2为载体的镍催化剂要大。La/Ni重量比在0.71附近,粒度最小,活性最高,分别以550°,650°,710℃高温处理一小时后,活性均有下降,但仍以La/Ni重量比在0.67～0.72范围内的催化剂粒度小、活性好。
In this paper, the average grain size of nickel in low nickel methanation catalysts was determined by X-ray powder diffraction (XRD). It was found that with the increase of lanthanum La content, the nickel grains of active material, which were impregnated with γ-Al 2 O 3 as support, The average grain size becomes smaller (within a certain range of La content), which is larger than that of the previous nickel catalysts supported on SiO_2. La / Ni weight ratio of 0.71 in the vicinity, the smallest particle size, the highest activity, respectively, at 550 °, 650 °, 710 ℃ high temperature treatment for one hour after the activity decreased, but still La / Ni weight ratio in the range of 0.67 ~ 0.72 The catalyst particle size is small, good activity.