摘要
采用共沸蒸馏-均匀沉淀法辅以超声波分散技术制备了纳米γ-Al2O3(γ-Al2O3(Ⅰ)),并以γ-Al2O3(Ⅰ)与商品γ-Al2O3(γ-Al2O3(Ⅱ))为载体,采用等体积浸渍法制得了Co与Mo负载量(分别以CoO与MoO3的质量分数计)分别为6%和16%的CoMo/γ-Al2O3(Ⅰ)与CoMo/γ-A12O3(Ⅱ)催化剂,采用间歇搅拌釜考察了催化剂的苯酚加氢脱氧性能。BET,SEM,XRD,H2-TPR,NH3-TPD表征结果表明,γ-Al2O3(Ⅰ)载体呈纤维介孔状,具有较大的比表面积、孔体积及适宜的孔分布。相对于CoMo/γ-A12O3(Ⅱ)催化剂,CoMo/γ-Al2O3(Ⅰ)催化剂的活性组分高度分散于γ-Al2O3(Ⅰ)载体表面,还原性能较高,酸中心较多。苯酚加氢脱氧反应结果表明,CoMo/γ-A12O3(Ⅰ)催化剂具有较高的加氢脱氧活性,苯酚转化率为79.2%,苯选择性为89.3%。
γ-AlzO3 （ I ）, which could was used as catalyst support in hydrodeoxygenation, was synthesized from Al2 （ SO4 ） 3 and NHaHCO3 through azeotropic distillation-homogeneous precipitation and ultrasonic dispersion. Both CoMo/γ-A1203 （ I ） and CoMo/γ-A12O3 （ Ⅱ ） catalysts with 6% cobalt and 16% molybdenum loadings （based on mass fractions of CoO and MoO3, respectively） were prepared through impregnation, in which γ-Al2O3 （ Ⅱ ） was a commercial support. Hydrodeoxygenations of phenol to benzene over the two CoMo/γ-A1203 catalysts were carried out in a batch stirred reactor separately. BET, SEM, XRD, Hz-TPR and NH3-TPD characterization results showed that γ-Al2O3 （ I ） support with fiber mesopore had larger surface area and pore volume as well as appropriate pore distribution. Compared with CoMo/y-A1zO3 （ Ⅱ ） catalyst, active component of CoMo/γ-Al2O3 （ I ） catalyst highly dispersed on surface of γ-A1203 （ I ）. And CoMo/γ-Al2O3 （ I ） was better in reduction behavior and more in acidic sites than CoMo/γ-A1203 （ II ）. Phenol conversion and benzene selectivity were 79.2% and 89.3% respectively in hydrodeoxygenation of phenol over CoMo/y-AlzO3 （ I ） catalyst.
出处
《石油化工》
CAS
CSCD
北大核心
2010年第1期42-46,共5页
Petrochemical Technology
基金
国家自然科学基金项目(20576110)
湖南省高校创新团队支持计划资助项目(06FJ4106)
湖南省教育厅重点项目(05A003)
关键词
Γ-氧化铝
钴钼催化剂
苯酚
加氢脱氧
苯
γ-alumina
cobalt molybdenum catalyst
phenol
hydrodeoxygenation
benzene
