钴基催化剂在费-托反应过程中的失活行为

催化学报 , 2010, 31(12): 1483-1488. doi: 10.3724/SP.J.1088.2010.00617

钴基催化剂在费-托反应过程中的失活行为

石利红 ^1, , 李晓峰 ^2, , 李德宝 ^3, , 孙予罕 ^4,

1.山西大学化学化工学院,山西,太原,030006;中国科学院山西煤炭化学研究所煤转化国家重点实验室,山西,太原,030001

2.太原幼儿师范学校基础理科,山西,太原,030027

3.中国科学院山西煤炭化学研究所煤转化国家重点实验室,山西,太原,030001

4.中国科学院山西煤炭化学研究所煤转化国家重点实验室,山西,太原,030001

基金项目: 国家重点基础研究发展计划(973计划)项目(2005CB221402)

关键词：钴 , 钌 , 费-托合成 , 疏水改性 , 失活

Deactivation of Cobalt-Based Catalysts for Fischer-Tropsch Synthesis

考察了Co/SiO2,Co/Ru/SiO2和疏水改性Co/Ru/SiO2催化剂在费-托合成过程中的稳定性.结果发现,随着反应的进行,三种催化剂都呈现一定程度的失活,它们稳定性高低顺序为:疏水改性Co/Ru/SiO2＞Co/SiO2＞Co/Ru/SiO2.Co/SiO2催化剂的失活足由于催化剂上Co晶粒的长大和硅酸钴物种的生成,而Co/Ru/SiO2和疏水改性Co/Ru/SiO2的失活则是由丁催化剂上co晶粒的长大所致.由于Co/Ru/SiO2催化剂的Co品粒比Co/SiO2催化剂的小得多,在反应过程中更容易长大,所以Co/Ru/SiO2催化剂稳定性更差;而疏水改性Co/Ru/SiO2催化荆表面的疏水性既抑制了硅酸钴物种的形成,又使Co晶粒长大较慢,因此其稳定性最高.

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