摘要
以RuCl3·3H2O为钌活性前体,高温热处理活性炭为载体制备钌催化剂.利用CO化学吸附表征手段,考察RuCl3活性前体的脱氯温度及各类助剂的氢解活化温度对活性金属钌分散状况的影响,并在一定温度压力条件下进行氨合成活性评价.结果表明,基于此载体的钌催化剂脱氯温度对金属分散度的影响不大,但对活性的影响却是显著的.影响活性的真正原因可能是氯离子的去除程度,碱金属促进的钌催化剂受金属分散度的影响比Ba-Ru TC更明显;各助剂对氢解温度的选择性缘于助剂的作用状态与抗热性,可从分散度的变化得到证明.
A novel ammonia synthesis catalyst, ruthenium derived from RuCl_3·3H_2O, based on thermally pretreated active carbon has been prepared. CO chemsorption is used to characterize the ruthenium catalyst. Effects of dechlorination and hydrogenolysis temperature on ruthenium dispersion and ammonia synthesis activity are studied. The results show that based on such support, dechlorination temperature shows a little impact on ruthenium sizes, but affects the catalytic activity obviously. The reason leading to high acivity may be the extent of dechlorinating. The alkali metals potassium and cesium seem to be more sensitive to the Ru dispersion than barium. The selectivity of various promoters on hydrogenolysis temperature may relate to their existing state and their thermal resistence ability proved with the changes of ruthenium dispersion.
出处
《福州大学学报（自然科学版）》
CAS
CSCD
2004年第2期228-231,共4页
Journal of Fuzhou University(Natural Science Edition)
基金
福建省自然科学基金资助项目(2000F002)
关键词
催化剂
钌
脱氯
氢解
金属分散度
氨合成
catalyst
Ru
dechlorination
hydrogenolysis
metal dispersion
ammonia synthesis
