邻甲酚加氢脱氧还原型催化剂的实验研究

Research on the Hydrodeoxygenation of o-Cresol Over Reduced Catalysts

以邻甲酚为生物质热解油模型化合物,研究了几种还原型加氢催化剂的催化脱氧性能的差异。采用孔饱和浸渍法制备了Mo/Al2O3、CoMo/Al2O3和CoMoEDTA/Al2O3加氢脱氧催化剂,采用H2-TPR、XRD对它们进行了表征;在H2气氛下对催化剂进行了还原,并在连续流动固定床加氢微反装置中,考察了邻甲酚在不同还原态催化剂催化下加氢脱氧反应的转化率和产物的选择性。结果表明,在相同的加氢反应条件下,CoMoEDTA/Al2O3的催化活性和稳定性均比Mo/Al2O3和CoMo/Al2O3催化剂高;在反应过程中,Mo/Al2O3催化剂表现出较高的直接脱氧选择性,而CoMo/Al2O3和CoMoEDTA/Al2O3催化剂表现出较高的加氢脱氧选择性。

Abstract： The hydrodeoxygenation performance of reduced catalyst was studied with o-cresol as model compound of bio pyrolysis oil. Mo/Al2O3, CoMo/Al2O3 and CoMoEDTA/Al2O3 hydrodeoxygenation catalysts were prepared by pore volume co impregnation method. The catalysts were characterized by means of H2-TPR and XRD, and reduced by H2 at atmospheric pressure. The hydrodeoxygenation activity and selectivity of o-cresol over these different reduced catalysts were investigated in a continuous flow fixed-bed micro-reactor. The results showed that compared with Mo/Al2O3 and CoMo/Al2O3 catalyst, CoMoEDTA/Al2O3 catalyst exhibited higher catalytic activity and stability at the same evaluation conditions. In addition, the direct-deoxygenation selectivity over Mo/Al2O3 catalyst was higher, while the hydrodeoxygenation selectivities over CoMo/Al2O3 and CoMoEDTA/Al2O3 catalysts were higher.