摘要
通过将M oO3引入N i/A l2O3-S iO2催化剂并经高温焙烧制备出N i-M oO3/A l2O3-S iO2催化剂。利用X射线衍射、程序升温还原和孔结构分析表征了改性前后催化剂的物理和化学特性,并且考察了催化剂在3-羟基丙醛(HPA)加氢反应中的催化性能。结果表明,用M oO3改性的催化剂孔道直径增大,起始还原温度降低,终点温度升高,还原区域扩大,耗氢量较未改性的催化剂明显增加。使用该催化剂,在V(H2)∶V(HPA)=2、HPA质量分数10.35%、氢气分压6.0M Pa、空速0.84h-1的条件下,使HPA加氢转化率达到75%所需的物料进口温度由改性前的55℃降至48℃;在将物料进口温度调整为55℃、其余条件不变时,进料空速可以由0.84h-1提高至1.30h-1。催化剂的活性评价结果表明,改性后催化剂的活性较改性前催化剂的活性明显提高。
Ni-MoO3/Al2O3-SiO2 catalyst was prepared by introducing MoO3 to Ni/Al2O3-SiO2 catalyst and calcined at high temperature. The newly prepared catalyst and the unmodified were characterized by XRD, TPR and pore structure analysis. Their catalytic activities were measured by hydrogenation of 3-hydroxypropanal (HPA) in a fixed-bed reactor. The modified catalyst was larger in pore diameter, and could be reduced at lower initial temperature and broader reduction temperature range. The consumption of hydrogen increased remarkably in comparing with the unmodified. During hydrogenation of HPA, Ni-MoO3/Al2O3-SiO2 as catalyst, if conversion of HPA was required as 75%, the inlet temperature to reactor could be lowered to 48°C instead of 55°C as before modification. If the inlet temperature was adjusted to 55°C, the space velocity could be increased from 0.84 h-1 to 1.30 h-1 without bringing down the conversion, while kept V(H2):V(HPA) at 2, hydrogen partial pressure at 6.0 MPa and mass fraction of HPA at 10.35%. Therefore the catalytic activity of the modified catalyst was obviously higher than the original.
出处
《石油化工》
EI
CAS
CSCD
北大核心
2005年第2期132-135,共4页
Petrochemical Technology
关键词
3-羟基丙醛
加氢
催化剂
改性
3-hydroxypropanal
hydrogenation
catalyst
modification
