Na^+、K^+离子交换对Co-Mo/MCM-41加氢脱硫催化剂的影响  

EFFECT OF Na^+,K^+ ION EXCHANGE ON Co-Mo/MCM-41 HYDRODESULFURIZATION CATALYSTS

作　　者：李翔[1] 王安杰[1] 张生[1] 鲁墨弘[1] 胡永康[2] 

机构地区：[1]大连理工大学精细化工国家重点实验室,辽宁大连116012 [2]辽宁省高校石油化工技术与装备重点实验室

出　　处：《石油学报（石油加工）》2006年第5期1-6,共6页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：国家自然科学基金项目(20333030;20503003)资助

摘　　要：用偏硅酸钠和正硅酸乙酯作硅源制备了MCM-41(分别记作MCM-41(S)和MCM-41(T))分子筛,并用Na2C2O4和K2C2O4对MCM-41(S)进行了碱金属离子交换改性。以质量分数0.8%的二苯并噻吩(DBT)的十氢萘溶液为模型化合物,考察了不同MCM-41担载的Co-Mo硫化物催化剂对DBT的加氢脱硫反应性能。结果表明,MCM-41担载的Co-Mo催化剂加氢活性较低,DBT主要通过直接脱硫反应路径脱硫。其活性顺序为:Co-Mo/MCM-41(T)>Co-Mo/MCM-41(S)>Co-Mo/MCM-41(K)>Co-Mo/MCM-41(Na)。UV-Vis结果表明,部分Co与MCM-41(S)中少量Al发生相互作用,生成了CoAl2O4,是造成Co-Mo/MCM-41(S)活性降低的重要因素。而在Co-Mo/MCM-41(K)和Co-Mo/MCM-41(Na)中,除CoAl2O4物种之外,碱金属的引入还促进了Co3O4物种的形成,使其活性进一步降低。Two MCM-41 samples were synthesized using sodium silicate hydrate and tetraethylorthosilieatekineties as silica source, denoted as MCM-41（S） and MCM-41（T） respectively. MCM-41（S） was then ion exchanged with Na2C2O4 and K2C2O4 to form MCM-41（Na） and MCM-41 （K）. The hydrodesulfrization （HDS） of dibenzothiophene （DBT） catalyzed by Co-Mo sulfides supported over different MCM-41 samples was studied by using a model fuel containing 0.8% DBT in deealin. The results indicated that Co-Mo sulfides supported over MCM-41 exhibited low hydrogenation activity and the desulfurization of DBT predominately took the route of direct desulfurization （DDS）. Both the DDS and HDS activities of Co-Mo catalysts decreased in the same order： Co-Mo/MCM-41 （T） 〉Co-Mo/MCM-41 （S） 〉 Co-Mo/MCM-41（K）〉Co-Mo/MCM-41（Na）. The UV-Vis results suggested that Co may interact with Al contained in MCM-41（S） sample to form CoAl2O4, resulting in the HDS activity decrease of Co-Mo/MCM-41（S）. The introduction of alkali metal ion into MCM-41（S） also caused the formation of Co304, which significantly decreases the activity of Co-Mo/MCM-41 （K） or Co-Mo/MCM-41 （Na）.

关 键 词：加氢脱硫 MCM-41 CO-MO 碱金属 离子交换 

分 类 号：TE624.9[石油与天然气工程—油气加工工程]