活性炭负载的Co-Mo催化剂的加氢脱硫性能 Ⅰ.活性炭载体与γ-Al2O3的对比

催化学报 , 2004, 25(5): 363-368.

活性炭负载的Co-Mo催化剂的加氢脱硫性能 Ⅰ.活性炭载体与γ-Al2O3的对比

商红岩 ^1, , 刘晨光 ^2, , 徐永强 ^3, , 赵瑞玉 ^4,

1.石油大学,华东,重质油加工国家重点实验室,CNPC催化重点实验室,山东东营,257061

2.石油大学,华东,重质油加工国家重点实验室,CNPC催化重点实验室,山东东营,257061

3.石油大学,华东,重质油加工国家重点实验室,CNPC催化重点实验室,山东东营,257061

4.石油大学,华东,重质油加工国家重点实验室,CNPC催化重点实验室,山东东营,257061

基金项目: 中国石油天然气集团公司资助项目(03A5050101)

关键词：钴 , 钼 , 活性炭 , 氧化铝 , 负载型催化剂 , 二苯并噻吩 , 加氢脱硫

Activated Carbon-Supported Co-Mo Catalyst for HydrodesulfurizationⅠ.Comparison of Activated Carbon and Alumina Supports

用XRD,TPR和XPS技术对Co-Mo/AC(活性炭)和Co-Mo/γ-Al2O3催化剂进行了表征,并以二苯并噻吩HDS反应评价了催化剂的活性. 在不同温度下处理的催化剂,其活性组分高度分散在活性炭表面,未检测到明显的Mo和Co物种. 在Co-Mo/AC催化剂中,表面物种的还原温度低于Co-Mo/γ-Al2O3的还原温度. 在260 ℃下处理的Co-Mo/AC催化剂,其表面Mo是高价态的Mo(Ⅵ),在500 ℃下处理的Co-Mo/AC催化剂,其表面存在Mo(Ⅴ)和Mo(Ⅵ)两种价态. 硫化态CoMoS/AC催化剂中存在Mo(Ⅳ)和Mo(Ⅴ)两种低价态的Mo物种,而S主要以S2-2和S2-的形式存在于MoS2和MoO3S2-中,还有部分高价态的S6+. 在硫化态CoMoS/γ-Al2O3催化剂中,Mo主要以Mo(Ⅴ)和Mo(Ⅵ)两种状态存在,而S主要以S2-2或S2-的形式存在于MoO2S2-和MoO3S2- 中,还有部分高价态的S6+. 活性评价结果表明,n(Co)/n(Mo)=0.7的Co-Mo/AC的活性高于Co-Mo/γ-Al2O3的活性,而其他Co/Mo比的Co-Mo/AC的活性低于Co-Mo/γ-Al2O3的活性.

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