新型锚链固定的多相化铑膦氢甲酰化催化剂的制备与性能

采用化学键联和溶胶-凝胶相结合的方法制备了带锚链固定的多相化铑膦络合物催化剂。利用FTIR,XPS,ICP及N2吸附对催化剂进行表征,揭示了催化剂内部结构与催化性能之间的关系。对催化剂的制备条件进行了优化,该催化剂用于1-己烯的氢甲酰化反应转化率达98.7％、选择性为99.5％、产物正构和异构的摩尔比为0.90。催化剂循环使用7次后仍具有很高的催化性能,经ICP和XPS分析可知,仅有催化剂外表面铑原子的脱落造成少量的铑流失(占铑质量的12.68％),具有较好的循环使用性能。

Preparation of a Novel Anchored Heterogenized Catalyst for Hydroformylation of 1-Hexene

Heterogenized rhodium complex was prepared by the combination method of anchoring and sol-gel technique. The catalyst was characterized by means of FIIR, XPS, ICP and N2 absorption. The relationship between catalytic property and internal structure was revealed. The factors affecting properties of catalysts during its preparation by sol-gel method were investigated.The conversion of 1-hexene could reach 98.7% , selectivity of aldehyde could be 99.5% and n/i was 0.90 under optimal conditions. After 7 cycles of reaction the heterogenized catalyst did not obviously lose its activity. From ICP and XPS analysis, Rh content of catalyst decreased only 12.68% ,leached mainly from exterior surface of the matrix. Therefore, Rh leaching problem of heterogenized catalyst was partly solved. The catalyst can be recycled in practice.